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Keyword researcher pro review - Free Activators

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keyword researcher pro review  - Free Activators

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Tech support scams are an industry-wide issue where scammers use scare tactics to trick you into unnecessary technical support services to supposedly fix device or software problems that don't exist.

At best the scammers are trying to get you to pay them to "fix" a nonexistent problem with your device or software. At worst they're trying to steal your personal or financial information; and if you allow them to remote into your computer to perform this "fix" they will often install malware, ransomware, or other unwanted programs that can steal your information or damage your data or device.

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How tech support scams work

Scammers may call you directly on the phone and pretend to be representatives of a tech company. They might even spoof the caller ID so that it displays a legitimate support phone number from a trusted company. They'll probably ask you to install applications that give them remote access to your device. Using remote access, these experienced scammers can misrepresent normal system messages as signs of problems.

Scammers might also initiate contact by displaying fake error messages on websites you visit, displaying support numbers and enticing you to call. They may also put your browser in full screen mode and display pop-up messages that won't go away, apparently locking your browser. These fake error messages aim to scare you into calling their "technical support hotline".

Important: Microsoft error and warning messages never include phone numbers.

When you engage with the scammers, they can offer fake solutions for your “problems” and ask for payment in the form of a one-time fee or subscription to a purported support service.

Note: Windows comes with Windows Security, a built-in security app that updates automatically to help keep your device safe. For more info, see Stay protected with Windows Security.

How to protect against tech support scams

First, be sure to follow these tips on how to keep your computer secure.

It is also important to keep the following in mind:

  • Microsoft does not send unsolicited email messages or make unsolicited phone calls to request personal or financial information, or to provide technical support to fix your computer. Any communication with Microsoft has to be initiated by you.

  • If a pop-up or error message appears with a phone number, don’t call the number. Error and warning messages from Microsoft never include a phone number.

  • Microsoft technical support will never ask that you pay for support in the form of cryptocurrency like Bitcoin, or gift cards.

  • Download software only from official Microsoft partner websites or the Microsoft Store. Be wary of downloading software from third-party sites, as some of them might have been modified without the author’s knowledge to bundle malware and other threats.

  • Use Microsoft Edge when browsing the internet. It blocks known support scam sites using Microsoft Defender SmartScreen. Also, Microsoft Edge can stop pop-up dialog loops used by these attackers.

  • Use Windows Security real-time antivirus protection in Windows. It's on by default and it detects and removes known support scam malware.

Tip: Click here for a free, printable, sheet of tips for spotting tech scams that you can keep for reference or share with friends and family.

What to do if a tech support scammer already has your info

  • Uninstall any applications that scammers have asked you to install. For more info on how to uninstall applications, see Repair or remove programs in Windows.

  • If you have given scammers access to your device, consider resetting it. To learn how, see Recovery options in Windows.

    Note: Performing serious recovery methods like resetting your device can be a bit time-consuming, but this may be your best option in some situations—for example, if fake error codes and messages pop up continually, all but preventing you from using your device. 

  • Run a full scan with Windows Security to remove any malware. Learn how.

  • Apply all security updates as soon as they are available. To see available updates, select the Start  button, then select Settings > Update & Security > Windows Update. For more info, see Update Windows.

  • Change your passwords. Learn how to change your Microsoft account password

  • Call your credit card provider to contest the charges if you've already paid. Let them know what happened; they'll probably want to cancel and replace your affected cards to prevent the scammers from using them again.

Reporting tech support scams

Help Microsoft stop scammers, whether they claim to be from Microsoft or not, by reporting tech support scams at:

www.microsoft.com/reportascam

You can also report unsafe websites in Microsoft Edge by selecting Settings and More > Help and Feedback> Report unsafe site  when you encounter something suspicious.

For urgent situations, use one of the following options:

Microsoft Support
Global Customer Service

and consider notifying your local law enforcement agency. 

Popular scam types

There are several forms of tech support scams, all of which aim to trick you into believing that your computer needs to be fixed and you need to pay for technical support services.

The classic cold-call scam. The scammers call you and claim to be from the tech support team of Microsoft or another company. They offer to help solve your computer "problems".

Scammers often use publicly available phone directories, so they might know your name and other personal information when they call you. They might even guess what operating system you're using.

Once they've gained your trust, they might ask for your user name and password or direct you to a legitimate website to install software that will let them access your computer to fix it. If you install the software and provide credentials, your computer and your personal information are vulnerable.

Although law enforcement can trace phone numbers, cybercriminals often use disposable mobile phones, spoofed caller ID, or stolen mobile phone numbers. Treat all unsolicited phone calls with skepticism. Don't provide any personal information.

Warning: If you receive an unsolicited call from someone claiming to be from Microsoft Support, hang up. We do not make these kinds of calls.

Tech support scam websites make you believe that you have a problem with your PC. You may be redirected to these websites automatically by malicious ads found in dubious sites, such as download locations for pirated software, videos, or music.

These websites may use a fake blue-screen or other system error, or a fake Windows activation dialog box to convince you that there's a problem with your PC that needs fixing.

They can also use the following techniques to make their claim more believable:

  • Put the image or your browser on full screen, making the error appear as though it’s coming from Windows instead of the webpage

  • Disable Task Manager

  • Continuously display pop-up windows

  • Play audio messages

All these techniques are meant to persuade you to call the specified tech support number. In contrast, the real error messages in Windows never ask you to call a tech support number.

Some tech support scams may also come in the form of malware. When run, this malware may display fake error notifications about your computer or software, similar to tech support scam websites. However, because they are installed on your computer, criminals will likely use them to perform other malicious actions, such as to steal data or install other malware.

Scammers may also use other ways to reach you, such as email, text messages, or chat. These messages may resemble phishing emails; however, instead of pointing to phishing sites designed to steal credentials, the links lead to tech support scam websites.

This listing might help you recognize and avoid tech support scam phone calls. It's not a comprehensive list, just a sample of numbers that have been used by scammers in the past.

  • (0)2070220828

  • (013)02238060

  • (013)42590058

  • (03)86575266

  • (03)8657-5321

  • (030)30807257

  • (040)87407257

  • (07)3062-7243

  • (1-833-870-9055

  • (20)888-6480

  • (32)025881811

  • (32)063680584

  • (33)0176363336

  • (43)215-5911

  • (6901443158195

  • (833)332-3666

  • (833)332-3999

  • (833)801-6989

  • (833)802-8800

  • (844)200-3935

  • (844)200-3946

  • (844)-325-0270

  • (844)378-0666

  • (844)393-0450

  • (844)393-0484

  • (844)393-0486

  • (844)-584-7375

  • (844)-731-1261

  • (844)793-5936

  • (844)869-5777

  • (844)966-5100

  • (855)-205-9531

  • (855)209-6074

  • (855)214-7894

  • (855)-225-7708

  • (855)-225-8066

  • (855)231-0539

  • (855)-239-2183

  • (855)-241-3845

  • (855)241-4667

  • (855)-250-8770

  • (855)-257-7114

  • (855)-266-4554

  • (855)266-4742

  • (855)278-4738

  • (855)-322-7973

  • (855)340-7428

  • (855)-351-1668

  • (855)-355-5293

  • (855)-356-7339

  • (855)-369-2906

  • (855)391-2888

  • (855)405-7100

  • (855)-447-0411

  • (855)-533-5796

  • (855)550-2111

  • (855)622-1162

  • (855)624-7391

  • (855)-649-8770

  • (855)-656-6781

  • (855)-700-0815

  • (855)739-7816

  • (855)-739-7820

  • (855)-740-4839

  • (855)-744-7535

  • (855)862-0306

  • (855)-889-3085

  • (855)894-7489

  • (866)201-6421

  • (866)201-6980

  • (866)203-7969

  • (866)-230-0166

  • (866)-242-4511

  • (866)-246-4836

  • (866)-260-0177

  • (866)-273-6495

  • (866)281-2116

  • (866)-285-2709

  • (866)288-2359

  • (866)-290-5160

  • (866)-291-8355

  • (866)298-8191

  • (866)-298-8192

  • (866)304-3926

  • (866)315-0847

  • (866)332-5687

  • (866)-350-2508

  • (866)366-2406

  • (866)374-5877

  • (866)-383-9914

  • (866)-383-9915

  • (866)402-1473

  • (866)-423-1070

  • (866)424-8189

  • (866)-424-8267

  • (866)-428-8273

  • (866)-433-0787

  • (866)-433-0852

  • (866)446-2174

  • (866)455-9175

  • (866)455-9333

  • (866)-461-1815

  • (866)475-7161

  • (866)475-9024

  • (866)-491-1840

  • (866)491-1851

  • (866)-537-8476

  • (866)-537-8543

  • (866)644-1220

  • (866)-664-7153

  • (866)664-7178

  • (866)-671-2872

  • (866)-745-9526

  • (866)-799-3813

  • (866)-804-9341

  • (866)-809-9055

  • (866)-811-5999

  • (866)811-6155

  • (866)-847-7752

  • (866)-853-5456

  • (866)-877-0206

  • (866)888-0929

  • (866)-897-2725

  • (877)-207-1433

  • (877)211-6638

  • (877)-211-6638

  • (877)217-6241

  • (877)219-6084

  • (877)-219-6439

  • (877)226-0927

  • (877)-245-8680

  • (877)-248-6220

  • (877)-249-0169

  • (877)249-0473

  • (877)-257-5169

  • (877)265-0722

  • (877)384-3140

  • (877)-393-8186

  • (877)-507-9671

  • (877)520-4840

  • (877)636-0404

  • (877)-678-1575

  • (877)-679-5793

  • (877)855-3653

  • (877)-855-3653

  • (877)855-3656

  • (877)-856-4665

  • (877)856-4874

  • (877)870-1153

  • (877)-873-3392

  • (888)206-1755

  • (888)215-8523

  • (888)-216-2759

  • (888)-218-0528

  • (888)-223-4021

  • (888)241-1223

  • (888)2444556

  • (888)248-8302

  • (888)271-9836

  • (888)2839922

  • (888)283-9922

  • (888)289-1009

  • (888)-319-2624

  • (888)-453-1072

  • (888)-453-1525

  • (888)466-6309

  • (888)-501-9477

  • (888)-563-5301

  • (888)623-3295

  • (888)-649-3908

  • (888)-649-9652

  • (888)660-1761

  • (888)694-2168

  • (888)694-2197

  • (888)-761-9452

  • (888)-799-5199

  • (888)810-5341

  • (888)810-8342

  • (888)811-4180

  • (888)829-5571

  • (888)829-5736

  • (888)-829-5799

  • (888)-835-3145

  • (888)-857-7032

  • (888)-858-8266

  • (888)-858-8361

  • (888)858-8437

  • (888)869-4769

  • (888)886-8732

  • (888)-892-6972

  • (888)894-5790

  • (888)992-3346

  • 001-800-291-7514

  • 001-800-741-0438

  • 001-800-862-3971

  • 001-833-248-5444

  • 001-833-248-5777

  • 001-844-217-3666

  • 001-844-416-1777

  • 001-844-441-4490

  • 001-855-340-0999

  • 001-855-371-9444

  • 001-855-382-4333

  • 001-855-433-1222

  • 001-855-433-1666

  • 001-855-433-5111

  • 001-888-334-1444

  • 001-888-549-8666

  • 001-888-578-9666

  • 001-888-696-0666

  • 001-888-711-6011

  • 010-8080698

  • 01-70-71-29-83

  • 01-76-35-02-82

  • 01-76-38-04-17

  • 01-76-44-01-87

  • 01-82-88-82-68

  • 01-82-88-82-69

  • 01-82-88-82-80

  • 01-82-88-82-88

  • 0-182-888-313

  • 01-82-88-83-23

  • 01-82-88-83-28

  • 01-82-88-83-34

  • 01-82-88-83-50

  • 01-82-88-83-55

  • 01-82-88-83-64

  • 01-82-88-83-85

  • 01-82-88-84-15

  • 01-82-88-84-18

  • 01-82-88-84-33

  • 01-84-88-00-78

  • 01-84-88-46-81

  • 01-84-88-64-48

  • 01-86-26-23-76

  • 01-86-26-42-69

  • 01-86-26-99-87

  • 0-28-08-44-42

  • 040-87407257

  • 0-408-740-8503

  • 0-408-740-9127

  • 076-888-8369

  • 07  6-888-8645

  • 0-800-014-8580

  • 0-800-041-8236

  • 0-800-041-8255

  • 0-800-041-8266

  • 0-800-046-5039

  • 0-800-046-5067

  • 0-800-046-5230

  • 0-800-046-5257

  • 0-800-046-5264

  • 0-800-046-5275

  • 0-800-069-8038

  • 0800-086-9887

  • 0800-086-9891

  • 0800-086-9895

  • 0800-086-9897

  • 0800-086-9967

  • 0-800-090-3815

  • 0-800-098-8251

  • 0800-183-3316

  • 0-800-183-8114

  • 0-805-081-394

  • 0-808-164-4743

  • 0808-189-4081

  • 085-208-4376

  • 085-208-5236

  • 09-75-18-92-61

  • 11480248

  • 1234567567

  • 12807848

  • 1-300-596-397

  • 1-300-596-398

  • 1510072932

  • 1510159041

  • 1510160969

  • 1510245655

  • 1-704-467-8894

  • 176363501

  • 176363506

  • 176391769

  • 1-800-208-4060

  • 1-800-208-4060-

  • 1-800-209-1664

  • 1-800-214-7440

  • 1-800-219-713

  • 1800-230-6165

  • 1-800-230-6593

  • 1-800-236-1513

  • 1-800-273-5970

  • 1-800-281-6897

  • 1-800-284-7304

  • 1-800-285-6111

  • 1-800-291-7514

  • 1-800-297-6859

  • 1-800-316-1942

  • 1-800-353-2506

  • 1800-431-283

  • 1-800-431-357

  • 1800-431-362

  • 1-800-431-395

  • 1800-431-452

  • 1-800-469-1480

  • 1-800-473-7579

  • 1-800-523-8091

  • 1-800-556-3984

  • 1800-569-0786

  • 1800-581-607

  • 1-800-602-312

  • 1-800-617-3364

  • 1-800-630-3153

  • 1-800-640-3506

  • 1-800-646-717

  • 1-800-653-1183

  • 1-800-658-8214

  • 1-800-683-9841

  • 1800-745-9386

  • 1-800-774-1799

  • 1-800-775-452

  • 1-800-826-5638

  • 1-800-861-585

  • 1-800-865-9812

  • 1-800-905-6904

  • 1800-949-31

  • 1-800-953-925

  • 1800-954-357

  • 18009568510

  • 1-800-969-507

  • 1-800-985-5120

  • 18022255900

  • 1817-237-9401

  • 182886069

  • 1-833-224-8222

  • 1-833-248-4555

  • 1-833-300-5666

  • 1-833-334-8999

  • 1-833-335-1333

  • 1-833-336-8633

  • 1-833-337-6555

  • 1-833-337-666

  • 1-833-339-7733

  • 1-833-399-999

  • 1-833-414-5500

  • 1-833-414-8800

  • 1833-425-7961

  • 1-833-432-7770

  • 1-833-543-8896

  • 1-833-706-4400

  • 1-833-706-8800

  • 1-833-776-8324

  • 1-833-783-7700

  • 1-833-802-2200

  • 1-833-863-6600

  • 1-833-870-9054

  • 1-833-870-9055

  • 1833-990-7999

  • 1-833-995-1999

  • 1-844-200-1625

  • 1-844-200-1653

  • 1-844-200-1712

  • 1-844-200-1713

  • 1-844-200-1716

  • 1-844-200-1751

  • 1-844-200-1859

  • 1-844-200-1890

  • 1-844-200-2560

  • 1-844-200-2574

  • 1-844-200-2578

  • 1-844-200-2629

  • 1-844-200-2650

  • 1-844-200-2870

  • 1-844-200-4091

  • 1-844-200-4098

  • 1-844-200-4099

  • 1-844-200-4116

  • 1-844-200-4203

  • 1-844-200-4243

  • 1-844-200-4246

  • 1-844-200-4249

  • 1-844-200-4323

  • 1-844-200-4379

  • 1-844-200-4473

  • 1-844-200-4474

  • 1-844-200-4485

  • 1-844-200-4486

  • 1-844-204-9149

  • 1-844-212-8344

  • 18442296999

  • 1-844-229-6999

  • 1-844-237-2411

  • 1-844-237-2411-

  • 1-844-238-9924

  • 1-844-240-732

  • 1-844-241-5999

  • 1-844-241-7912

  • 1-844-248-2909

  • 1-844-252-6111

  • 1-844-284-8623

  • 1-844-301-371

  • 1-844-305-5027

  • 1-844-307-1915

  • 1-844-313-2994

  • 1-844-313-6006

  • 1-844-313-9175

  • 18443189400

  • 1-844-318-9400

  • 1-844-326-3137

  • 1-844-350-4289

  • 1-844-352-9401

  • 1-844-366-5999

  • 1-844-370-2707

  • 1-844-371-8869

  • 1-844-378-6561

  • 1-844-378-6777

  • 1-844-378-6888

  • 1-844-400-9542

  • 1-844-411-4922

  • 1-844-422-5281

  • 1-844-428-3630

  • 1-844-470-9939

  • 1-844-489-6111

  • 1-844-539-5778

  • 1-844-539-5784

  • 1-844-542-4107

  • 1844-554-2336

  • 1-844-554-2336

  • 1-844-556-2898

  • 1-844-556-7758

  • 1-844-558-1757

  • 1-844-573-4082

  • 1-844-577-2888

  • 1-844-594-0202

  • 1-844-594-202

  • 1-844-613-8256

  • 1-844-613-8256-

  • 1-844-622-9881

  • 1-844-651-2555

  • 1-844-653-8666

  • 1-844-656-1695

  • 1844-662-9666

  • 1-844-662-9666

  • 1-844-665-6888

  • 1-844-675-2565

  • 1-844-675-8730

  • 1-844-693-9511

  • 1-844-712-8372

  • 1-844-712-8372-

  • 1-844-715-0111

  • 1-844-715-111

  • 1-844-719-6166

  • 1-844-724-6592

  • 1-844-730-7111

  • 1-844-743-6449

  • 1-844-750-6258

  • 1-844-755-0510

  • 1-844-775-6410

  • 1-844-775-8407

  • 1-844-779-444

  • 1844-781-9888

  • 1-844-792-2887

  • 1-844-800-6856

  • 1-844-801-5941

  • 1-844-805-0111

  • 1-844-807-4555

  • 1-844-811-1823

  • 1-844-811-606

  • 1-844-816-7270

  • 1-844-843-5125

  • 18448559343

  • 1-844-855-9343

  • 1-844-858-5647

  • 1-844-866-408

  • -1-844-867-2500

  • 1-844-872-1286

  • 1-844-873-1596

  • 1-844-882-29

  • 1-844-885-1444

  • 1-844-891-1947

  • 1-844-891-4879

  • 1-844-895-3281

  • 1845-203-3355

  • 1-845-205-9081

  • 1-845-233-6465

  • 184883029

  • 184886445

  • 184887053

  • 1-850-583-3302

  • 18552033941

  • 1-855-203-6745

  • 18552054077

  • 1-855-205-4077

  • 18552054170

  • 1855-228-920

  • 1-855-261-444

  • 1-855-269-5777

  • 1-855-278-5777

  • 1-855-287-5222

  • 1-855-297-8444

  • 1-855-302-8333

  • 1-855-307-6690

  • 1-855-307-6690-

  • 1-855-307-6697

  • 1-855-325-1775

  • 1-855-336-7111

  • 1-855-340-999

  • 1-855-372-4111

  • 1-855-374-9888

  • 1-855-382-4333

  • 1-855-389-2999

  • 1-855-389-4333

  • 1-855-390-1666

  • 1-855-393-4537

  • 1-855-400-5988

  • 1-855-428-2297

  • 1-855-433-5111

  • 1-855-441-7442

  • 1-855-441-7646

  • 1-855-442-4430

  • 1-855-490-1999

  • 1-855-490-3222

  • 1-855-501-3222

  • 1-855-534-8622

  • 1-855-558-6111

  • 18556221162

  • 1-855-633-1666

  • 1-855-654-999

  • 1-855-676-6410

  • 1-855-687-6111

  • 1-855-697-5333

  • 1-855-707-865

  • 1-855-718-9786

  • 1-855-755-0999

  • 1-855-844-199

  • 1-855-844-8599

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Источник: https://support.microsoft.com/en-us/windows/protect-yourself-from-tech-support-scams-2ebf91bd-f94c-2a8a-e541-f5c800d18435

Immunoregulatory potential of mesenchymal stem cells following activation by macrophage-derived soluble factors

  • Laura SaldañaORCID: orcid.org/0000-0003-3057-46491,2,
  • Fátima Bensiamar1,2,
  • Gema Vallés1,2,
  • Francisco J. Mancebo1,2,
  • Eduardo García-Rey2,3 &
  • Nuria Vilaboa1,2

Stem Cell Research & Therapyvolume 10, Article number: 58 (2019) Cite this article

  • 5360 Accesses

  • 52 Citations

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Abstract

Background

Immunoregulatory capacity of mesenchymal stem cells (MSC) is triggered by the inflammatory environment, which changes during tissue repair. Macrophages are essential in mediating the inflammatory response after injury and can adopt a range of functional phenotypes, exhibiting pro-inflammatory and anti-inflammatory activities. An accurate characterization of MSC activation by the inflammatory milieu is needed for improving the efficacy of regenerative therapies. In this work, we investigated the immunomodulatory functions of MSC primed with factors secreted from macrophages polarized toward a pro-inflammatory or an anti-inflammatory phenotype. We focused on the role of TNF-α and IL-10, prototypic pro-inflammatory and anti-inflammatory cytokines, respectively, as priming factors for MSC.

Methods

Secretion of immunoregulatory mediators from human MSC primed with media conditioned by human macrophages polarized toward a pro-inflammatory or an anti-inflammatory phenotype was determined. Immunomodulatory potential of primed MSC on polarized macrophages was studied using indirect co-cultures. Involvement of TNF-α and IL-10 in priming MSC and of PGE2 in MSC-mediated immunomodulation was investigated employing neutralizing antibodies. Collagen hydrogels were used to study MSC and macrophages interactions in a more physiological environment.

Results

Priming MSC with media conditioned by pro-inflammatory or anti-inflammatory macrophages enhanced their immunomodulatory potential through increased PGE2 secretion. We identified the pro-inflammatory cytokine TNF-α as a priming factor for MSC. Notably, the anti-inflammatory IL-10, mainly produced by pro-resolving macrophages, potentiated the priming effect of TNF-α. Collagen hydrogels acted as instructive microenvironments for MSC and macrophages functions and their crosstalk. Culturing macrophages on hydrogels stimulated anti-inflammatory versus pro-inflammatory cytokine secretion. Encapsulation of MSC within hydrogels increased PGE2 secretion and potentiated immunomodulation on macrophages, attenuating macrophage pro-inflammatory state and sustaining anti-inflammatory activation. Priming with inflammatory factors conferred to MSC loaded in hydrogels greater immunomodulatory potential, promoting anti-inflammatory activity of macrophages.

Conclusions

Factors secreted by pro-inflammatory and anti-inflammatory macrophages activated the immunomodulatory potential of MSC. This was partially attributed to the priming effect of TNF-α and IL-10. Immunoregulatory functions of primed MSC were enhanced after encapsulation in hydrogels. These findings may provide insight into novel strategies to enhance MSC immunoregulatory potency.

Background

The inflammatory response to tissue injury is essential for the correct restoration of tissue structure and function. However, an uncontrolled or unresolved inflammatory process can lead to chronic inflammation and further tissue damage. Macrophages are key regulators of wound healing and are involved in both advancing and resolving inflammation by secreting multiple cytokines and growth factors. Macrophages exhibit functional transitions as tissue repair progresses and can adopt a wide spectrum of phenotypes. Two of the best-characterized phenotypes are pro-inflammatory or M1-like phenotype and anti-inflammatory or M2-like phenotype. M1 macrophages produce high levels of pro-inflammatory cytokines and are related to the early stage of inflammation whereas M2 macrophages, with lower pro-inflammatory cytokine production, are associated with the resolution of inflammation and tissue repair [1]. There is evidence that macrophages can display more complex phenotypes with traits associated with both M1 and M2 activation states [2, 3]. In addition, mixed populations of macrophages have been identified [4, 5]. Functional repolarization of macrophages toward an anti-inflammatory phenotype ensures proper return to homeostasis after injury and is mediated by a large panel of mediators including prostaglandin E2 (PGE2) [6]. Several studies suggest that an incorrect balance between M1- and M2-like activities after injury can lead to persistent inflammation and/or maladaptive repair processes, both contributing to aberrant tissue repair [7, 8]. Due to their critical role during wound healing, macrophages have emerged as potential targets in therapeutic tissue regeneration strategies [9].

Accumulating evidence suggests that mesenchymal stem cells (MSC) promote tissue repair and regeneration through modulation of immune response and secretion of growth factors rather than by replacement of damaged cells. MSC release a wide range of immunoregulatory factors including PGE2 and interleukin-6 (IL-6) that skew macrophages toward a pro-resolving profile [10]. Immunoregulatory capacity of MSC is not constitutive, but depends on a process of “licensing” that implies the activation of MSC by the inflammatory milieu. Thus, in response to inflammatory mediators, MSC produce soluble factors that regulate the immune response. The requirement of MSC activation to induce immunoregulation is supported by data showing that suppression of T cells proliferation induced by MSC in co-cultures was only achieved after addition of sufficient levels of interferon-γ (IFN-γ) and tumor necrosis factor-α (TNF-α) [11,12,13]. Macrophages plasticity leads to changes in the balance between pro-inflammatory and anti-inflammatory factors as tissue is healed and remodeled. The earliest events trigger the release of numerous pro-inflammatory mediators, which are followed by a shift to increased production of anti-inflammatory cytokines and growth factors to allow tissue repair [14]. Additionally, pro-inflammatory and anti-inflammatory cytokine expression can be induced simultaneously at early stages of inflammation [15]. Given the variability of macrophage activation states throughout the course of inflammation and tissue repair, it is expected that MSC establish interactions with different macrophage phenotypes and that both pro-inflammatory and anti-inflammatory cytokines influence MSC-mediated immunomodulation. To date, the effects of the cocktail of factors originated from pro-inflammatory or anti-inflammatory macrophage populations on immunomodulatory properties of MSC have not been described.

MSC, like all somatic tissues, express human leukocyte antigens (HLA) class I constitutively and have the ability to express HLA class II when exposed to inflammatory factors. The HLA class I antigens are associated with the activation of CD8+ T lymphocytes while HLA class II antigens are recognized by CD4+ T lymphocytes. MSC appear to evade immune rejection by modulating T cell phenotype and immunosuppressing the local environment. A number of clinical trials involving allogeneic MSC transplantation have shown overall safety and potential effectiveness [16]. MSC have been employed in the clinical treatment of graft-versus-host disease (GvHD) due to their ability to inhibit proliferation and cytotoxic activity of immune system cells. A limited number of clinical trials have reported humoral alloimmunization in human subjects receiving mismatched MSC, but it remains unclear whether this has an impact on their therapeutic efficacy [17]. There is growing interest in combining MSC with hydrogels prepared with extracellular matrix (ECM) proteins that resemble the microenvironments where they reside in order to prolong cell survival, potentiate their function, and prevent rejection by the host [18, 19]. In this work, we extensively investigated the immunomodulatory functions of human MSC activated with secreted factors from human monocyte-derived macrophages polarized toward a pro-inflammatory or an anti-inflammatory phenotype using standard two-dimensional (2D) culture conditions. We focused on the role of TNF-α and IL-10, prototypic pro-inflammatory and anti-inflammatory cytokines, respectively, as priming factors for MSC. Immunoregulatory potential of MSC was evaluated in co-cultures with pro-inflammatory or anti-inflammatory macrophage populations. The assays that led to the most informative data were then performed using MSC encapsulated in collagen hydrogels, which represent a more physiological relevant model.

Methods

Isolation and culture of primary human macrophages

Buffy coats were obtained from 30 healthy blood donors, as anonymously provided by the Comunidad de Madrid Blood Bank (Madrid, Spain). Ethical approvals for all blood sources and processes used in this study were approved by the Human Research Committee of Hospital Universitario La Paz (Date of Approval: 03/06/2015). All experiments were carried out in accordance with the approved guidelines and regulations. Human peripheral blood mononuclear cells (PBMC) were isolated from buffy coats by density gradient centrifugation using Ficoll-Paque Plus (GE Healthcare Bio-sciences, Uppsala, Sweden). For monocyte isolation, PBMC were seeded at a density of 15 × 106/well in six-well plates and allowed to adhere for 1 h in serum-free RPMI (Lonza, Basel, Switzerland). Adherent cells were cultured for 7 days in RPMI supplemented with 10% (v/v) heat-inactivated fetal bovine serum (FBS) and 200 U/ml of granulocyte macrophage-colony stimulating factor (GM-CSF) or 20 ng/ml macrophage-colony stimulating factor (M-CSF) (both from Peprotech, London, UK). Cytokines were added every 2 days. Macrophages generated in the presence of GM-CSF or M-CSF are referred to as MΦGM and MΦM, respectively. Conditioned media (CM) were obtained from MΦGM or MΦM that were treated or not with 10 ng/ml lipopolysaccharide (LPS) (Sigma, Madrid, Spain) for 90 min, washed three times with phosphate-buffered saline (PBS), and cultured in RPMI medium supplemented with 10% FBS for 5 h. The CM were clarified by centrifugation at 1200g for 10 min. The experimental scheme used to generate CM is shown in Fig. 1a.

Immunomodulatory effects of MSC primed with CM from macrophages. a Scheme used to generate conditioned media (CM) from macrophages (upper row). MΦGM or MΦM were treated (CMGM or CMM, respectively) or not (CMGM− or CMM−, respectively) with LPS for 90 min, thoroughly washed with PBS to remove LPS, and incubated in fresh media for 5 h. Scheme of the set-up of co-cultures (lower row). MSC were incubated or not with CM from macrophages or with cytokines for 48 h, thoroughly washed with PBS, and co-cultured with MΦGM or MΦM in the presence of LPS for 24 h. b Levels of inflammatory cytokines in CM of MΦGM or MΦM stimulated or not with LPS. Number of MΦGM (c) or MΦM (d) cultured in isolation or co-cultured with MSC primed or not (−) with CM (left graphs) and levels of TNF-α (middle graphs) and IL-10 (right graphs) in media. *p < 0.05. N.D., not detected

Full size image

MSC culture and co-culture with macrophages

Purified human bone marrow-derived MSC were purchased from Lonza and expanded in a defined medium (Lonza) consisting of basal medium and supplement mix. All experiments were performed between passages 5 and 7 using cells isolated from six different donors aged 18–30 years. 105 MSC were seeded in the upper chamber of a 24-mm-diameter transwell insert with 0.4-μm pores (Corning, Lowell, MA, USA) and incubated for 48 h in 3 ml of DMEM supplemented with 15% (v/v) heat-inactivated FBS or in 3 ml of a mixture of equal volumes of DMEM with 15% FBS and CM from macrophages. When indicated and prior to addition to MSC, CM were incubated for 1 h at 37 °C with 1 μg/ml neutralizing antibody against TNF-α or IL-10 (Biolegend, San Diego, CA, USA). Parallel sets of MSC were treated for 48 h with 1 or 10 ng/ml TNF-α, 0.1 or 1 ng/ml IL-10, or combinations of both cytokines (Peprotech). These doses were selected based on the concentrations of TNF-α and IL-10 in the mixtures of DMEM and CM from LPS-stimulated MΦGM or MΦM used for MSC treatments. MSC treated with CM or cytokines are referred to as primed MSC. The transwells with unprimed or primed MSC were washed with PBS and transferred to six-well plates containing cultures of MΦGM or MΦM and incubated for 24 h in 3 ml of a mixture of equal volumes of RPMI and DMEM containing 12.5% FBS and 10 ng/ml LPS. When indicated, 1 μg/ml antibody against PGE2 (Cayman Chemical Company, Ann Arbor, MI, USA) or IL-6 (R&D Systems, Wiesbaden, Germany) was added along with LPS. At the end of the incubation period, the number of live macrophages was determined by the trypan blue dye exclusion test. The experimental scheme used for setting co-cultures is shown in Fig. 1a. In some experiments, 105 MSC were seeded in 12-well plates and incubated with CM or cytokines as described above. After 48 h, MSC were washed with PBS and further incubated for 24 h in fresh culture media, as shown in the experimental scheme in Fig. 4a. To assess that MSC modulate cytokine secretion of stimulated macrophages in the absence of LPS, macrophages were treated with LPS for 90 min, washed with PBS, and then co-cultured with MSC for 5 h in fresh media (see experimental scheme in Additional file 1: Figure S2).

Collagen gel co-cultures

Hydrogels (HG) containing 1.5 mg/ml collagen were prepared by mixing at 4 °C 40 μl of 10X DMEM, 10 μl of 1 N NaOH, 162 μl of H2O, 8 μl of 7.5% NaHCO3, 100 μl of serum-free DMEM, and 180 μl of 5 mg/ml rat-tail type I collagen diluted in 0.1 M acetic acid (Ibidi GmbH, Martinsried, Germany). 105 MSC, previously treated or not for 48 h with CM, were resuspended in 100 μl of serum-free DMEM and added to the solution. HG-lacking cells were used as controls. After homogenizing the mixture by pipetting, 600 μl of suspension were distributed per well of 24-well plates and incubated at 37 °C for 30 min. After polymerization, 600 μl of RPMI supplemented with 25% (v/v) FBS were added and 2 × 105GM or MΦM were seeded onto HG loaded or not with MSC. Then, HG media were supplemented with 10 ng/ml LPS and incubated for 24 h. For comparative purposes, macrophages were seeded on 24-well plates made of tissue culture plastic (TCP) and incubated for 24 h in 1200 μl of a mixture of equal volumes of RPMI and DMEM containing 12.5% FBS and 10 ng/ml LPS. In the case of MSC, cells were seeded on TCP or encapsulated in HG and further incubated for 24 h in the same media without LPS. The experimental scheme used is shown in Fig. 8a. The cell morphology was observed under a phase-contrast microscope (Nikon Diaphot, Tokio, Japan).

Flow cytometry assays

Immunofluorescence staining of cell surface antigens in MSC was performed by incubating cells for 30 min at 4 °C in the dark with mouse anti-human leukocyte antigen (HLA)-DR, DP, DQ (HLA class II)-FITC, HLA-ABC (HLA class I)-APC, CD34-FITC, CD44-FITC, CD105-PE, CD29-APC, and CD45-APC Abs (all from BD Biosciences, San Jose, CA,USA). Phenotypic characterization of macrophages generated by incubation with GM-CSF or M-CSF was assessed by staining with CD163-PE, CD197 (CCR7)-FITC, and CD80-APC (all from Miltenyi Biotec, Bergisch-Gladbach, Germany). Cells incubated in the absence of antibodies were used as controls. After incubation, cells were washed three times with PBS, fixed with 1% (w/v) formaldehyde in PBS, and analyzed by flow cytometry using a FACSCalibur analyzer and CellQuest software (both from BD Biosciences).

Immunoenzymatic assays

The culture media were clarified by centrifugation at 1200g for 10 min; supplemented with 2 μg/ml aprotinin, 17.5 μg/ml phenyl-methylsulfonyl fluoride, 1 μg/ml pepstatin A, and 50 μg/ml bacitracin (Sigma); and stored at − 80 °C. Levels of TNF-α, IL-10, and IL-6 in cell culture media were determined using BD CBA Flex Sets (BD Biosciences). The data were acquired using a FACSCalibur flow cytometer and analyzed with the FCAP Array Software version 3.0 (BD Biosciences). The detection limits of the CBA Flex Sets were 3.7 pg/ml for TNF-α, 2.5 pg/ml for IL-6, and 3.3 pg/ml for IL-10. PGE2 levels were measured using a human-specific ELISA kit (Cayman) with a detection limit of 15 pg/ml.

Gene expression

Total RNA was isolated using TRI Reagent (Molecular Research Center, Inc., Cincinnati, OH, USA). Complementary DNAs were prepared from total RNA using the Transcriptor Reverse Transcriptase and an anchored-oligo (dT)18 primer (Roche Applied Science, Indianapolis, IN, USA). Real-time quantitative PCR was performed using LightCycler FastStart DNA Master SYBR Green I and LightCycler detector (Roche). Quantitative expression values were extrapolated from standard curves and were normalized to glyceraldehyde 3-phosphate dehydrogenase (GAPDH) values. Specific oligonucleotide primers were IL-6, 5′-CCCCAGGAGAAGATTCCAAA-3′ (forward primer, F), 5′-CCAGTGATGATTTTCACCAGG-3′ (reverse primer, R); cyclooxygenase-2 (COX-2), 5′-TGAGCATCTACGGTTTGCTG-3′ (F), 5′-TGCTTGTCTGGAACAACTGC-3′ (R); and GAPDH, 5′-GTGAAGGTCGGAGTCAACG-3′ (F), 5′-GAAGATGGTGATGGGATTTCC-3′ (R).

Statistical analysis

The statistical analyses were performed using the Statistical Program for Social Sciences version 11.5 (SPSS Inc., Chicago, IL, USA). Data are presented as means ± SD of six independent experiments. Quantitative data were tested using two-sided Kruskal-Wallis and Mann-Whitney U rank-sum tests. Post hoc comparisons were analyzed by the Mann-Whitney U test, adjusting the p value with the Bonferroni correction, and the level of significance was set to p < 0.05.

Results

Priming MSC with factors secreted by pro-inflammatory or anti-inflammatory macrophages enhances their immunomodulatory potential

We primed MSC with CM from MΦGM or MΦM stimulated or not with LPS to examine the influence of inflammatory cytokines on MSC immunomodulatory potential (Fig. 1a). MΦGM expressed the M1 markers CD80 and CCR7 whereas they were devoid of cell surface CD163, a marker of M2 macrophages. In contrast, MΦM expressed high levels of CD163 and very low levels of CD80 and CCR7 (Additional file 1: Figure S1). The concentrations of inflammatory cytokines in the CM from MΦGM or MΦM correlated with their pro-inflammatory or anti-inflammatory phenotype, respectively (Fig. 1b). CM from LPS-stimulated MΦGM (CMGM) contained higher levels of TNF-α and IL-6 and lower levels of IL-10 than CM from LPS-stimulated MΦM (CMM). IL-10 levels could not be detected in CM from unstimulated macrophages, which contained low concentrations of TNF-α and IL-6 (Fig. 1b). To evaluate their immunomodulatory potential, MSC primed or not with CM were co-cultured with MΦGM or MΦM as shown in Fig. 1a. MSC did not affect macrophage viability, as numbers of live MΦGM or MΦM cultured in isolation or co-cultured with primed or unprimed MSC were similar (Fig. 1c, d, left panels). Co-culture of MΦGM with unprimed MSC decreased TNF-α levels, an effect also observed in co-cultures of MΦM (Fig. 1c, d, middle panels). MSC primed with CM from unstimulated macrophages had no effect on TNF-α secretion from MΦGM or MΦM (Fig. 1c, d, middle panels). However, MSC primed with CM from LPS-stimulated macrophages further decreased TNF-α levels in co-cultures and no differences were found between priming with CMGM or CMM (Fig. 1c, d, middle panels). The low IL-10 levels secreted by MΦGM were not altered when co-cultured with unprimed MSC or CMM-primed MSC but increased in co-cultures with CMGM-primed MSC (Fig. 1c, right panels). IL-10 production by MΦM was notably reduced in co-cultures with unprimed MSC (Fig. 1d, right panels). However, this reduction was not observed when MSC were primed with CMGM or CMM. As observed for TNF-α, IL-10 levels in co-cultures were unaffected by priming MSC with CM from unstimulated macrophages (Fig. 1c, d, right panels). To assess that MSC can modulate TNF-α and IL-10 secretion of stimulated macrophages in the absence of LPS, macrophages were treated with LPS, washed, and then co-cultured with MSC in fresh media (Additional file 1: Figure S2). Under these conditions, MSC decreased TNF-α levels in co-cultures with MΦGM or MΦM and priming MSC with CMGM or CMM increased their immunomodulatory properties, as observed in co-cultures treated with LPS. Also, changes in IL-10 levels induced by MSC were similar in co-cultures with or without LPS. Taken together, our data show that MSC primed with CM from LPS-stimulated macrophages, which contain high levels of inflammatory mediators, display greater immunomodulatory potential than unprimed MSC.

TNF-α and IL-10 in CM from macrophages are involved in priming MSC

We next investigated the role of the pro-inflammatory TNF-α and the anti-inflammatory IL-10 cytokines as priming factors for MSC. For this purpose, CM from macrophages were incubated with neutralizing TNF-α or IL-10 antibody before being added to MSC. Treatment of CMGM or CMM with anti-TNF-α reduced the ability of primed MSC to decrease TNF-α levels in co-cultures of MΦGM (Fig. 2a, left panel). Interestingly, a modulatory effect on TNF-α secretion was also observed when CMM, which contained high IL-10 amounts, were treated with anti-IL-10. IL-10 secretion induced by CMGM-primed MSC in co-cultures of MΦGM was attenuated when CM were incubated with anti-TNF-α (Fig. 2a, right panel). Neutralization of IL-10 in CMGM had no effect on TNF-α and IL-10 levels (Fig. 2a). To further investigate the effect of TNF-α and IL-10 on MSC, cells were incubated with these cytokines before co-culturing with MΦGM (Fig. 2b). IL-10 at 0.1 ng/ml had no effect on MSC immunomodulation. TNF-α levels in co-cultures were also unaffected by priming MSC with either IL-10 or TNF-α at 1 ng/ml, but decreased after incubation with both cytokines (Fig. 2b, left panel). Priming MSC with 10 ng/ml TNF-α diminished TNF-α levels in co-cultures, which further decreased when MSC were primed with 10 ng/ml TNF-α plus 1 ng/ml IL-10. Finally, IL-10 levels in co-cultures increased only when MSC were primed with 10 ng/ml TNF-α, alone or in combination with IL-10 (Fig. 2b, right panel). Regarding co-cultures of MΦM, neutralization of TNF-α in CMGM or CMM reduced the ability of primed MSC to modulate TNF-α levels without affecting IL-10 (Fig. 3a). Moreover, blocking IL-10 in CMM suppressed the regulatory effects of primed MSC. Priming effects of TNF-α on MSC in co-cultures of MΦM increased when 1 ng/ml IL-10 was added (Fig. 3b, left panel). Notably, IL-10 levels increased when MΦM were co-cultured with MSC primed with 1 ng/ml of IL-10 independently of the presence of TNF-α (Fig. 3b, right panel). Overall, these data indicate that TNF-α and IL-10 secreted from macrophages prime MSC to enhance their immunomodulatory potential.

TNF-α and IL-10 prime MSC to regulate cytokine secretion from pro-inflammatory macrophages. a TNF-α and IL-10 levels in media of MΦGM cultured in isolation or co-cultured with MSC primed or not (−) with CMGM or CMM. CM were incubated or not (−Ab) with neutralizing antibody (Ab) against TNF-α or IL-10. b TNF-α and IL-10 levels in media of MΦGM cultured in isolation or co-cultured with MSC primed or not (−) with the indicated doses of TNF-α, IL-10 or combinations of both cytokines. *p < 0.05

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TNF-α and IL-10 prime MSC to regulate cytokine secretion from anti-inflammatory macrophages. a TNF-α and IL-10 levels in media of MΦM cultured in isolation or co-cultured with MSC primed or not (−) with CMGM or CMM. CM were incubated or not (−Ab) with neutralizing antibody (Ab) against TNF-α or IL-10. b TNF-α and IL-10 levels in media of MΦM cultured in isolation or co-cultured with MSC primed or not (−) with the indicated doses of TNF-α, IL-10 or combinations of both cytokines. *p < 0.05

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Immunomodulatory effects of primed MSC on macrophages are mediated by PGE2

Next, we examined whether the soluble mediators PGE2 and IL-6 are involved in the immunomodulation mediated by primed MSC. Priming MSC with CM resulted in increased secretion of IL-6, which reached higher levels after incubation with CMGM than with CMM (Fig. 4b, left panel). To explore whether TNF-α and IL-10 originated from macrophages play a role in this regulation, CM were incubated with neutralizing antibodies. The increase in IL-6 secretion induced by CMGM or CMM was attenuated by blocking TNF-α but not IL-10. Interestingly, PGE2 production increased to a similar extent in MSC primed with CMGM or CMM and this effect was largely attenuated by neutralizing TNF-α (Fig. 4b, right panel). Blocking IL-10 decreased PGE2 levels secreted by MSC primed with CMM but not with CMGM. Incubation of MSC with TNF-α but not IL-10 induced a dose-dependent increase in IL-6 and PGE2 secretion (Fig. 4c). Notably, MSC primed with TNF-α in combination with high doses of IL-10 secreted higher PGE2 levels than MSC treated with TNF-α alone (Fig. 4c, right panel). This effect was not observed for IL-6 secretion (Fig. 4c, left panel). IL-6 levels were substantially higher in single-cultured MΦGM than in MΦM whereas PGE2 secretion was similar for both macrophage phenotypes (Fig. 5a). Co-culturing with primed or unprimed MSC led to a similar increase in IL-6 levels (Fig. 5a, left panel). PGE2 levels also increased upon co-culturing MΦGM or MΦM with MSC although increased further when MSC were primed with CM (Fig. 5a, right panel). No differences were found between priming with CMGM or CMM. Next, mRNA levels of IL6 and COX2, a key enzyme in PGE2 synthesis, were determined in MSC cultured in isolation or co-cultured with macrophages. IL6 and COX2 mRNA levels in single-cultured MSC correlated with IL-6 and PGE2 secretion profiles (Figs. 5b and 4b). IL6 mRNA levels increased after priming MSC with CM, but to a higher extent with CMGM than with CMM. In contrast, COX2 transcript levels increased to the same extent after exposure to CMGM or CMM (Fig. 5b). IL6 and COX2 mRNA levels in MSC substantially increased when co-cultured with macrophages. Similar to that observed at the secretion level, COX2 mRNA levels in primed MSC co-cultured with macrophages were higher than those in unprimed counterparts whereas these differences were not found in IL6 transcript (Fig. 5b). These results indicate that priming with CM may potentiate the secretion of PGE2 from MSC in co-cultures but not of IL-6.

IL-6 and PGE2 secretion by primed MSC. a Scheme of MSC treatment with CM or cytokines. b IL-6 and PGE2 levels in media of MSC primed or not (−) with CMGM or CMM. CM were incubated or not (−Ab) with neutralizing antibody (Ab) against TNF-α or IL-10. c IL-6 and PGE2 levels in media of MSC primed or not with the indicated doses of TNF-α, IL-10 or combinations of both cytokines. *p < 0.05

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IL-6 and PGE2 secretion and mRNA levels in co-cultures of macrophages and primed MSC. a IL-6 and PGE2 levels in media of MΦGM or MΦM cultured in isolation or co-cultured with MSC primed or not (−) with CMGM or CMM. bIL6 and COX2 mRNA fold changes in MSC primed or not with CM and cultured in isolation or co-cultured with MΦGM or MΦM. mRNA data are relative to those measured in unprimed MSC cultured in isolation, which were given the arbitrary value of 1. *p < 0.05

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To examine whether TNF-α and IL-10 secretion from macrophages was regulated by PGE2 and IL-6, co-cultures were incubated with neutralizing antibodies against these mediators. TNF-α levels were similar in co-cultures incubated with anti-PGE2 and in macrophages cultured in isolation (Fig. 6a, b, left panels). In contrast, TNF-α levels in co-cultures treated with anti-IL-6 were lower than in isolated macrophages. The regulation in TNF-α levels induced by MSC primed with CMGM or CMM was suppressed by blocking PGE2 but not IL-6 (Fig. 6a, b, left panels). IL-10 levels in co-cultures were hardly affected by incubation with neutralizing antibodies. The only effect was observed in co-cultures of MΦGM as the increase in IL-10 levels induced by CMGM-primed MSC was attenuated when PGE2 was blocked (Fig. 6a, right panel). These data show that primed MSC co-cultured with macrophages decrease TNF-α levels through the secretion of PGE2. PGE2 is also involved in the regulation of IL-10 in co-cultures of primed MSC with MΦGM but not with MΦM.

Involvement of IL-6 and PGE2 in the regulation of macrophage cytokine secretion by primed MSC. TNF-α and IL-10 levels in media of MΦGM (a) or MΦM (b) cultured in isolation or co-cultured with MSC primed or not (−) with CMGM or CMM. Co-cultures were incubated in the absence or presence of neutralizing antibody (Ab) against IL-6 or PGE2. *p < 0.05

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Primed MSC encapsulated in collagen hydrogels promote macrophage anti-inflammatory versus pro-inflammatory cytokine secretion

Immune rejection of allogeneic MSC has been associated with an alteration in HLA expression following exposure to inflammatory factors [20, 21]. Cell surface levels of HLA class I increased after treatment of MSC with CM, while no effect was observed for HLA class II (Fig. 7). Expression levels of other cell surface molecules related to MSC identity were not altered by CM treatment (Fig. 7). Encapsulation of MSC in HG has been proposed as a strategy to enhance their survival after transplantation and potentiate their function. We extended our study to explore the immunomodulatory properties of CM-primed MSC encapsulated in collagen HG, where cells are permitted to grow in three dimensions. To this end, MΦGM or MΦM were seeded on HG, loaded or not with MSC, and stimulated with LPS. Macrophages or MSC were also cultured on TCP, as classical 2D cell growth conditions (Fig. 8a). On TCP, most MΦGM acquired a polygonal morphology whereas the majority of MΦM exhibited an elongated spindle-like shape (Fig. 8b). However, both MΦGM and MΦM adopted a rounded shape when seeded on HG, being this morphological change more evident for MΦGM. MSC encapsulated in HG were more spindle shaped than cells cultured on TCP (Fig. 8b). We found that the balance between IL-10 and TNF-α levels secreted from MΦGM or MΦM on HG suffered important alterations compared with TCP and was characterized by higher IL-10 to TNF-α ratio (Fig. 8c). PGE2 secretion from unprimed or primed MSC loaded in HG was higher than on TCP (Fig. 8d). As observed on TCP, priming with CM substantially increased PGE2 secretion from MSC in HG (Fig. 8d). This increase was also detected when MΦGM or MΦM were co-cultured on the HG surface (Fig. 8e, f, left panels). Incubation of MSC with CM before encapsulation in HG enhanced their immunomodulatory properties on macrophages. Thus, MΦGM or MΦM cultured on MSC-loaded HG secreted lower TNF-α levels than macrophages cultured on empty HG, an effect further enhanced when MSC were primed with CM (Fig. 8e, f, middle panels). Interestingly, IL-10 secretion from MΦGM increased when HG were loaded with MSC and further increased when MSC were primed with CM (Fig. 8e, right panels). High IL-10 levels secreted by MΦM on HG were unaffected by loading unprimed MSC whereas increased when MSC were primed with CM (Fig. 8f, right panels). In all cases, similar effects were observed by priming MSC with CMGM or CMM. Taken together, these data indicate that MSC encapsulated in HG enhance the ratio of IL-10 to TNF-α levels secreted by MΦGM or MΦM and that these immunoregulatory effects are potentiated by priming MSC with factors secreted by macrophages.

Effect of factors secreted by macrophages on MSC identity. Flow cytometric determinations of the expression of surface markers in MSC primed or not with CMGM or CMM. Gray-filled histograms correspond to cells non incubated with antibodies

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Regulation of macrophage cytokine secretion by MSC loaded in HG. a Scheme of MSC treatment with CM and cell culture in HG (upper row). Scheme of macrophage culture on HG loaded with MSC primed or not with CM (middle row) or cultured on HG lacking MSC (lower row). b Images of MΦGM or MΦM cultured on TCP or HG and of unprimed MSC cultured on TCP or encapsulated in HG. c Ratio between IL-10 and TNF-α levels in media of MΦGM or MΦM cultured on TCP or HG. d PGE2 levels in media of MSC primed or not with CM and cultured on TCP or encapsulated in HG. PGE2, TNF-α and IL-10 levels in media of MΦGM (e) or MΦM (f) cultured on empty HG or on HG loaded with MSC primed or not with CM. *p < 0.05

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Discussion

Immunomodulatory effects of MSC are the result of an integrated response to extracellular stimuli, which change during the course of wound healing. MSC require threshold levels of inflammatory factors to activate their immunosuppressive function whereas insufficient MSC activation may contribute to potentiate inflammation [10, 12]. Based on these observations, treatment of MSC with inflammatory factors prior to implantation has emerged as an attractive strategy to boost their immunoregulatory effects, as shown in animal models of colitis, acute myocardial ischemia, GvHD, and tendon and ligament healing [22,23,24,25,26]. Classical pro-inflammatory cytokines released at the early stage of inflammation such as IFN-γ, TNF-α, or IL-1β potentiate paracrine effects of MSC on macrophages [23, 27,28,29]. In this work, we show for the first time that factors originated from pro-inflammatory or anti-inflammatory macrophages enhance immunomodulatory properties of MSC. Our data show that MSC immunomodulation was enhanced by priming MSC with CM from LPS-stimulated MΦGM or MΦM but not by CM from unstimulated macrophages, supporting the notion that MSC are mainly activated by inflammatory factors. Priming MSC with CMGM promoted MΦGM polarization toward an anti-inflammatory phenotype, as evidenced by reduced TNF-α levels and increased IL-10 secretion. Blocking TNF-α in CMGM significantly attenuated the immunomodulatory effects of primed MSC indicating that TNF-α acts as a priming factor for MSC and therefore plays a critical role in MSC and macrophage interactions. Interestingly, MSC primed with CMM reduced TNF-α secretion from MΦGM to a similar extent than MSC primed with CMGM, suggesting that MSC can be activated by the cytokine milieu of damaged and repairing tissue. To our knowledge, it remains unclear whether anti-inflammatory factors influences MSC activation. Our data show for the first time that IL-10 originated from anti-inflammatory macrophages contributes to potentiate immunomodulatory functions of MSC. We found that the ability of primed MSC to reduce TNF-α secretion from MΦGM was enhanced by the content of TNF-α and IL-10 in CMM. IL-10 alone was insufficient to potentiate MSC immunomodulation, but enhanced the priming effect of TNF-α. These results indicate that MSC activation by IL-10 is dependent on TNF-α and suggest that IL-10 may act amplifying MSC activation by pro-inflammatory factors rather than as a priming factor. It is interesting to note that besides TNF-α and IL-10, CM contain a large range of soluble factors that may contribute to prime MSC. The optimal timing for MSC delivery remains uncertain and likely depends on the inflammatory environment associated with a specific disease or disorder. MSC administration at the early inflammatory stage, rather than after disease stabilization, seems to better guarantee the achievement of immunosuppressive activity in the case of acute GvHD [30]. However, the repair phase after acute myocardial infarction may be a more favorable time for MSC administration than during the acute injury phase, in which the hostile microenvironment could impair survival of transplanted cells [31]. Data herein suggest that MSC may be effective in modulating the immune response when transplanted at the onset of resolution, when both pro-inflammatory and anti-inflammatory factors are secreted [6], facilitating an effective transition from the pro-inflammatory phase to tissue repair.

MSC-mediated immunomodulation involves a complex network of cytokines as well as cell to cell interactions. PGE2 exert anti-inflammatory effects on macrophages via the cyclic AMP-responsive element (CRE) binding proteins (CREB), which regulate the transcription rates of several immune-related genes, including TNF-α and IL-10, upon binding to CRE present in their promoter regions [32]. More recently, it has been described that IL-6 regulates anti-inflammatory macrophage polarization although underlying mechanism has not been fully elucidated [33, 34]. Using blocking antibodies, we demonstrated that IL-6 and PGE2 mediate the reduction in TNF-α secretion from MΦGM in co-cultures with MSC. Interestingly, CMGM and CMM, which contained high and low levels of pro-inflammatory factors, respectively, were similarly effective in stimulating PGE2 secretion by MSC. This effect may be explained by the IL-10-induced increase in PGE2 levels in the presence of low or high concentrations of TNF-α. In this regard, IL-10 has been shown to enhance MSC activation by other inflammatory factors, as production of IFN-β and IL-10 by regulatory T cells synergistically induced expression of the immunoregulatory factor indoleamine 2,3-dioxygenase (IDO) at the mRNA level in MSC [35]. However, we did not detect IDO protein levels in the media of the various cultures and co-cultures of unprimed or primed MSC (data not shown). Changes in PGE2 secretion in co-cultures paralleled changes in COX2 mRNA levels in MSC indicating that production of this mediator was regulated at the mRNA level. The ability of primed MSC to further decrease TNF-α secretion by MΦGM could be attributed to PGE2 but not to IL-6, as indicated in the experiments using neutralizing antibodies against these mediators. These data support the notion that MSC immunomodulatory potential is strongly related to the production of PGE2 and suggest that enhancement of the production of this immunoregulatory factor by anti-inflammatory stimuli occurs at the onset of resolution.

It is interesting to note that co-culturing MΦGM with unprimed MSC or with MSC primed with CMM, which contained low levels of pro-inflammatory factors, failed to increase IL-10 secretion. MSC may require strong activation in a pro-inflammatory milieu to promote anti-inflammatory signatures in MΦGM as MSC primed with CMGM led to increased IL-10 levels in co-cultures. Recent in vitro and in vivo studies show that priming MSC with TNF-α at 10 ng/ml or higher doses favors macrophage polarization toward an anti-inflammatory phenotype [22, 29]. In fact, we detected that blocking TNF-α in CMGM reduced the ability of primed MSC to increase IL-10 secretion from MΦGM and that priming MSC with 10 ng/ml TNF-α alone enhanced IL-10 levels in co-cultures. Reprograming macrophages to an anti-inflammatory phenotype has been shown to be mediated by PGE2 [36]. Supporting this, neutralization of PGE2 in co-cultures of MΦGM and MSC primed with CMGM reduced IL-10 levels. We speculate that PGE2 may promote IL-10 secretion from MΦGM via the CREB signaling pathway, as described in cultures of mouse bone marrow macrophages [37]. Notably, priming MSC with CMM, which increased PGE2 secretion, did not result in increased IL-10 production in co-cultures with MΦGM, indicating that other factors secreted by MSC cooperate with PGE2 in macrophage phenotype switching.

Paracrine interactions between MSC and anti-inflammatory macrophages have been scarcely investigated. MSC, primed or not with CM from macrophages, regulated TNF-α secretion from MΦM in a similar way to that observed in co-cultures with MΦGM whereas IL-10 production showed different trends. As observed by others [38], IL-10 levels secreted by MΦM decreased after co-culturing with unprimed MSC. In contrast, MΦM maintained their anti-inflammatory traits when co-cultured with MSC primed with inflammatory factors. These results suggest that the cytokine environment strongly influences the ability of MSC to control anti-inflammatory functions of macrophages, allowing resolution of inflammation or preventing excessive anti-inflammatory activation that could impair tissue healing. Moreover, paracrine effects of MSC on MΦM could be regulated by anti-inflammatory factors secreted in the resolution of inflammation, as suggested by the data from experiments in which MSC were primed with a high concentration of IL-10. It should be mentioned that changes in IL-10 levels in co-cultures of MΦM were independent of the PGE2 content, suggesting that different signaling pathways regulate IL-10 production in pro-inflammatory and anti-inflammatory phenotypes.

Murine MSC upregulated the expression of MHC class II molecules in response to IFN-γ and were rejected after implantation in immunocompetent MHC-mismatched mice [39,40,41]. In human MSC, the expression of both HLA classes I and II increased after treatment with IFN-γ [20]. Our data show that treatment of MSC with CM increased surface expression of HLA class I but not of HLA class II, which could be attributed to an inhibitory effect of factors contained in the CM. For example, transforming growth factor-β (TGF-β) has been shown to reduce IFN-γ-induced expression of HLA class II in human MSC [42]. One approach to improve stem cell-based therapies is the use of biomaterial carriers. Type I collagen HG have been successfully used as drug delivery vehicles for the treatment of long bone fracture and spinal fusion [43]. Moreover, collagen HG have been explored to increase MSC survival after implantation and prevent immune rejection in vivo [44]. We observed that collagen HG are instructive microenvironments for macrophages and MSC functions as well as for the crosstalk between both cell types. Collagen HG substantially decreased pro-inflammatory activation of MΦGM and potentiated anti-inflammatory activity of MΦM as compared to 2D substrates. Increased PGE2 secretion and greater immunomodulatory activity were observed in MSC cultured in three-dimensional (3D) topographies [45] or in spheroids [46], effects that were attributed to 3D disposition of MSC. Our data suggest that encapsulation of MSC in HG is an effective approach to enhance immunomodulatory properties of MSC. MSC in HG promoted anti-inflammatory switching of MΦGM, as indicated by marked reduction in TNF-α levels and increase in IL-10 production, and sustained MΦM activation characterized by high IL-10 secretion. Priming with CM conferred to MSC loaded in HG greater immunomodulatory potential, promoting MΦGM polarization toward an anti-inflammatory phenotype and supporting MΦM anti-inflammatory activation. Enhanced immunoregulatory effects of primed MSC in HG were probably a result of the substantial increase in PGE2 levels compared to unprimed counterparts. Taken together, our results show that priming MSC with inflammatory factors originated from macrophages enhances their immunomodulatory potential. In fact, recent preclinical data supports the safety of IFN-γ-primed MSC infused in mice and their effectiveness to treat immune-related diseases [23, 47]. Encapsulation of primed MSC in HG could be an effective approach to improve their therapeutic efficacy upon implantation. Further studies are required to elucidate the in vivo immunomodulatory potential of primed MSC loaded in HG.

Conclusions

Factors secreted by pro-inflammatory and anti-inflammatory macrophages activate the immunomodulatory potential of MSC. This was attributed, at least in part, to the priming effect of TNF-α and was associated with an increase in PGE2 production by MSC. We identified that IL-10 secreted from anti-inflammatory macrophages, in combination with other inflammatory factors, activate MSC to secrete PGE2 and potentiate the priming effect of TNF-α. Encapsulation of primed MSC in collagen HG enhances their immunoregulatory function, promoting anti-inflammatory activity of macrophages. These findings contribute to the understanding of the mechanisms by which macrophages polarization dynamics instruct MSC and may provide a basis for the development of novel strategies to enhance MSC immunoregulatory potential.

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  21. 21.

    Berglund AK, Fortier LA, Antczak DF, Schnabel LV. Immunoprivileged no more: measuring the immunogenicity of allogeneic adult mesenchymal stem cells. Stem Cell Res Ther. 2017;8(1):1–7.

    ArticleCAS Google Scholar

Источник: https://stemcellres.biomedcentral.com/articles/10.1186/s13287-019-1156-6

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Journal of Alzheimers Disease & Parkinsonism
Open Access

Commentary

Simultaneous Activation of Nrf2, Elevation of Antioxidants and Reduction in Glutamate Level: An Essential Strategy for Prevention and Improved Management of Neurodegenerative Diseases

Kedar N Prasad*

Kedar N Prasad, Engage Global, 245 El Faisan Drive, San Rafael, CA 94903, USA

*Corresponding Author:
Kedar N Prasad
Engage Global, 245 El Faisan Drive
San Rafael, CA 94903, USA
Tel: 415-686-6251
E-mail: [email protected]

Received date: October 05, 2016; Accepted date: October 24, 2016; Published date: October 31, 2016

Citation: Prasad KN (2016) Simultaneous Activation of Nrf2, Elevation of Antioxidants and Reduction in Glutamate Level: An Essential Strategy for Prevention and Improved Management of Neurodegenerative Diseases. J Alzheimers Dis Parkinsonism 6:277. doi: 10.4172/2161-0460.1000277

Copyright: © 2016 Prasad KN. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Despite extensive research on the biochemical and genetic defects in Alzhemier’s disease (AD), Parkinson’s disease (PD), Huntington’s disease (HD) and post-traumatic stress disorders (PTSDs), there are no effective preventive strategies; and the treatment methods remain unsatisfactory. The reviews of these studies suggested that enhanced production of free radicals, persistence inflammation were one of the earliest events in the development and progression of these diseases. Excess release of glutamate occurred in HD and PTSD earlier than in AD and PD. Glutamate together with excess free radicals and pro-inflammatory cytokines participate in the progression of these diseases. Thus, reducing simultaneously these biochemical defects may prevent, and together with standard therapy, enhance the care of neurodegenerative diseases. Previous studies using primarily individual antioxidants produced variable outcomes ranging from transient benefits in the early phase of the disease to no effect. In order to optimally attenuate oxidative stress, persistence inflammation and glutamate, it is necessary to simultaneously increase the cellular levels of cytoprotective enzymes including antioxidant enzymes, antioxidant compounds that are derived from the diet and made in the body and reduce glutamate level. Enhancement of antioxidant compounds and attenuation of glutamate level are achieved by supplementation with antioxidants and B-vitamins; however, increasing the cellular levels of antioxidant enzymes needs an activation of Nr2 that is ROS-dependent and ROSindependent. In neurodegenerative diseases, Nrf2 is not activated by ROS; however, antioxidants activate ROSindependent Nrf2. This commentary briefly describes the genetic and epigenetic factors that regulate the activation of Nrf2, and proposes a micronutrient mixture that may simultaneously activate ROS-independent Nrf2, increase the cellular levels of antioxidants, and decrease the release and toxicity of glutamate. This micronutrient mixture may simultaneously and optimally reduce oxidative, chronic inflammation and glutamate, and thus, may prevent and together with standard therapy, enhance the care of these neurodegenerative diseases.

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Источник: https://www.omicsonline.org/peer-reviewed/simultaneous-activation-of-nrf2-elevation-of-antioxidants-and-reductionin-glutamate-level-an-essential-strategy-for-prevention-and-82671.html

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However, consuming a high-fat diet significantly accelerated development of tumors in the PFAS-exposed mice, said the scientists at the University of Illinois Urbana-Champaign and the U. of I. Chicago who conducted the research. PFAS is an abbreviation for perfluoroalkyl and polyfluoroalkyl substances, often described as "forever chemicals" because they don't degrade naturally and persist as environmental pollutants. Studies have associated PFAS with harmful effects in laboratory animals.

"Our data suggest that exposure to PFAS synergizes with dietary fat to activate the protein-coding gene PPARa, altering cells' metabolism in ways that escalate the carcinogenic risk in normal prostate cells while driving tumor progression in malignant cells," said food science and human nutrition professor Zeynep Madak-Erdogan, the principal investigator on the project.

"These alterations in cell metabolism that occur downstream of PPARa activation may underpin the increased prostate cancer risk observed in men who are exposed to PFAS," said Madak-Erdogan, who also holds an appointment as a health innovation professor with the Carle Illinois College of Medicine.

In their analyses of gene transcription activity, the scientists found that PPARa was expressed at significantly greater levels in the tumor cells of the PFAS-exposed mice that ate the high-fat diet. PPARa controls cell proliferation and differentiation, aids in immune and inflammatory responses and has been found to play a key role in the development of liver and kidney cancers, according to the study.

Previous studies, including some conducted in humans, linked PFAS with a range of serious health problems such as prostate cancer, the most common male cancer in the U.S.

Published in the journal Nutrients, the current study's findings are believed to be the first to shed light on the synergistic interactions of PFAS and dietary fat and the metabolic changes that shift benign prostate cells to a malignant state, triggering rapidly growing tumors.

The scientists injected an aggressive form of malignant human prostate cells into the flanks of male mice that were fed either a high-fat diet intended to mimic the typical Western diet or a control diet. Some of the mice also received oral doses of perfluorooctane sulfonate (PFOS), one of the most common forms of PFAS that has been associated with avg pc tuneup business edition - Crack Key For U cancers.

"We observed an increase in the tumors' volume when exposed to either the high-fat diet or the PFOS," said co-author Michael J. Spinella, a scientist in the Cancer Center at Illinois and professor of comparative biosciences. "However, at 40 days post-injection, we observed that the fastest tumor growth occurred in the group of mice that both ate the high-fat diet and received PFOS exposure, which suggested a synergistic interaction between Easy Duplicate Finder Registration key two."

In cell culture, the scientists exposed benign prostate cells and a derivative line of aggressive malignant cells to PFOS and found that the malignant cells replicated at triple the rate of the cells in the control group.

When the researchers exposed the benign and malignant cells to another form of PFAS, perfluorobutane sulfonic acid, the malignant cells' viability was five times greater than the cells in the control group.

Studies have associated PFBS exposure -- which can occur through polluted air or polluted drinking water -- with diseases of the thyroid and other organs.

The scientists hypothesized that metabolic energy pathways within the cells were undergoing changes to facilitate the rapid growth observed.

"We analyzed keyword researcher pro review - Free Activators metabolites that changed in response to PFOS treatment, and we found that the metabolic phenotype of the prostate cancer cells was altered, upregulating the proliferative energy pathways," said co-author Joseph Irudayaraj, the associate director for shared resources at the Cancer Center at Illinois and a founder professor of bioengineering at the U. of I.

"Exposure to PFOS significantly upregulated genes associated with metabolism, particularly the molecule pyruvate, which is involved in glucose metabolism, and the precursor molecule acetyl-coenzyme A that facilitates the metabolism of fatty acids and steroids," he said.

Prior research, including a 2019 study led by Madak-Erdogan, found that changes in the metabolism of pyruvate and fatty acids were associated with various forms of cancer and other diseases. In that study, published in the journal Cancer Research, Madak-Erdogan's team found that free fatty acids caused estrogen-receptor positive breast cancer cells to increase cell proliferation and tumor growth.

Structurally, chemicals in the PFAS family resemble free fatty acids and bind to the same sites on serum proteins, Madak-Erdogan said.

Co-authors of the new study include former nutritional sciences graduate student and first author Ozan Berk Imir; University of Illinois Chicago urology professor Wen-Yang Hu; UIC andrology lab director and urology professor Gail S. Prins; U. of I. Urbana-Champaign comparative biosciences research scientist Ratnakar Singh; graduate student Qianying Zuo; research assistant Yu-Jeh Liu; and undergraduate student Alanna Zoe Kaminsky.

The research was supported by grants from the National Institutes of Food and Agriculture in the U.S. Department of Agriculture, the U. of I. Office of the Vice Chancellor for Research, and an Arnold O. Beckman Award from the Campus Research Board.

make a difference: sponsored opportunity


Story Source:

Materials provided by University of Illinois at Urbana-Champaign, News Bureau. Original written by Sharita Forrest. Note: Content may be edited for style and length.


Journal Reference:

  1. Ozan Berk Imir, Alanna Zoe Kaminsky, Qian-Ying Zuo, Yu-Jeh Liu, Ratnakar Singh, Michael J. Spinella, Joseph Irudayaraj, Wen-Yang Hu, Easy Duplicate Finder Activation key S. Prins, Zeynep Madak Erdogan. Per- and Polyfluoroalkyl Substance Exposure Combined with High-Fat Diet Supports Prostate Cancer Progression. Nutrients, 2021; 13 (11): 3902 DOI: 10.3390/nu13113902

Cite This Page:

University of Illinois at Urbana-Champaign, News Bureau. "PFAS exposure, high-fat diet drive prostate cells’ metabolism into pro-cancer state: Dietary fat synergizes with PFAS to trigger cancer in benign cells, accelerate tumor growth in malignant cells." ScienceDaily. ScienceDaily, 11 November 2021. <www.sciencedaily.com/releases/2021/11/211111154311.htm>.

University of Illinois at Urbana-Champaign, News Bureau. (2021, November 11). PFAS exposure, high-fat diet drive prostate cells’ metabolism into pro-cancer state: Dietary fat synergizes with PFAS to trigger cancer in benign cells, accelerate tumor growth in malignant cells. ScienceDaily. Retrieved November 19, 2021 from www.sciencedaily.com/releases/2021/11/211111154311.htm

University of Illinois at Urbana-Champaign, News Bureau. "PFAS exposure, high-fat diet drive prostate cells’ metabolism into pro-cancer state: Dietary fat synergizes with PFAS to trigger cancer in benign cells, accelerate tumor growth in malignant cells." ScienceDaily. www.sciencedaily.com/releases/2021/11/211111154311.htm (accessed November 19, 2021).


Источник: https://www.sciencedaily.com/releases/2021/11/211111154311.htm

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Immunoregulatory potential of mesenchymal stem cells following activation by macrophage-derived soluble factors

  • Laura SaldañaORCID: orcid.org/0000-0003-3057-46491,2,
  • Fátima Bensiamar1,2,
  • Gema Vallés1,2,
  • Francisco J. Mancebo1,2,
  • Eduardo García-Rey2,3 &
  • Nuria Vilaboa1,2

Stem Cell Research & Therapyvolume 10, Article number: 58 (2019) Cite this article

  • 5360 Accesses

  • 52 Citations

  • Metrics details

Abstract

Background

Immunoregulatory capacity of mesenchymal stem cells (MSC) is triggered by the inflammatory environment, which changes during tissue repair. Macrophages are essential in mediating the inflammatory response after injury and can adopt a range of functional phenotypes, exhibiting pro-inflammatory and anti-inflammatory activities. An accurate characterization of MSC activation by the inflammatory milieu is needed for improving the efficacy of regenerative therapies. In this work, we investigated the immunomodulatory functions of MSC primed with factors secreted from macrophages polarized toward a pro-inflammatory or an anti-inflammatory phenotype. We focused on the role of TNF-α and IL-10, apowermirror 1.4.3.3 crack - Free Activators pro-inflammatory and anti-inflammatory cytokines, respectively, as priming factors for MSC.

Methods

Secretion of immunoregulatory mediators from human MSC primed with media conditioned by human macrophages polarized toward a pro-inflammatory or an anti-inflammatory phenotype was determined. Immunomodulatory potential of primed MSC on polarized macrophages was studied using indirect co-cultures. Involvement of TNF-α and IL-10 in priming MSC and of PGE2 in MSC-mediated immunomodulation was investigated employing neutralizing antibodies. Collagen hydrogels were used to study MSC and macrophages interactions in a more physiological environment.

Results

Priming MSC with media conditioned by pro-inflammatory or anti-inflammatory macrophages enhanced their immunomodulatory potential through increased PGE2 secretion. We identified the pro-inflammatory cytokine TNF-α as a priming factor for MSC. Notably, the anti-inflammatory IL-10, mainly produced by pro-resolving macrophages, potentiated the priming effect of TNF-α. Collagen hydrogels acted as instructive microenvironments for MSC and macrophages functions and their crosstalk. Culturing macrophages on hydrogels stimulated anti-inflammatory versus pro-inflammatory cytokine secretion. Encapsulation of MSC within hydrogels increased PGE2 secretion and potentiated immunomodulation on macrophages, attenuating macrophage pro-inflammatory state and sustaining anti-inflammatory activation. Priming with inflammatory factors conferred to MSC loaded in hydrogels greater immunomodulatory potential, promoting anti-inflammatory activity of macrophages.

Conclusions

Factors secreted by pro-inflammatory and anti-inflammatory macrophages activated the immunomodulatory potential of MSC. This was partially attributed to the priming effect of TNF-α and IL-10. Immunoregulatory functions of primed MSC were enhanced after encapsulation in hydrogels. These findings may provide insight into novel strategies to enhance MSC immunoregulatory potency.

Background

The inflammatory response to tissue injury is essential for the correct restoration of tissue structure and function. However, an uncontrolled or unresolved inflammatory process can lead to chronic inflammation and further tissue damage. Macrophages are key regulators of wound healing and are involved in both advancing and resolving inflammation by secreting multiple cytokines and growth factors. Macrophages exhibit functional transitions as tissue repair progresses and can adopt a wide spectrum of phenotypes. Two of the best-characterized phenotypes are pro-inflammatory or M1-like internet down manager and anti-inflammatory or M2-like phenotype. M1 macrophages produce high levels of pro-inflammatory cytokines and are related to the early stage of inflammation whereas M2 macrophages, with lower pro-inflammatory cytokine production, are associated with the resolution of inflammation and tissue repair [1]. There is evidence that macrophages can display more complex phenotypes with traits associated with both M1 and M2 activation states [2, 3]. In addition, mixed populations of macrophages have been identified [4, 5]. Functional repolarization of macrophages toward an anti-inflammatory phenotype ensures proper return to homeostasis after injury and is mediated by a large panel of mediators including prostaglandin E2 (PGE2) [6]. Several studies suggest that an incorrect balance between M1- and M2-like activities after injury can lead to persistent inflammation and/or maladaptive repair processes, both contributing to aberrant tissue repair [7, 8]. Due to their critical role during wound healing, macrophages have emerged as potential targets in therapeutic tissue regeneration strategies [9].

Accumulating evidence suggests that mesenchymal stem cells (MSC) promote tissue repair and regeneration through modulation of immune response and secretion of growth factors rather than by replacement of damaged cells. MSC release a wide range of immunoregulatory factors including PGE2 and interleukin-6 (IL-6) that skew macrophages toward a pro-resolving profile [10]. Immunoregulatory capacity of MSC is not constitutive, but depends on a process of “licensing” that implies the activation of MSC by the inflammatory milieu. Thus, in response to inflammatory mediators, MSC produce soluble factors that regulate the immune response. The requirement of MSC activation to induce immunoregulation is supported by data showing that suppression of T cells proliferation induced by MSC in co-cultures was only achieved after addition of sufficient levels of interferon-γ (IFN-γ) and tumor necrosis factor-α (TNF-α) [11,12,13]. Macrophages plasticity leads to changes in the balance between pro-inflammatory and anti-inflammatory factors as tissue is healed and remodeled. The earliest events trigger the release of numerous pro-inflammatory mediators, which are followed by a shift to increased production of anti-inflammatory cytokines and growth factors to allow tissue repair [14]. Additionally, pro-inflammatory and anti-inflammatory cytokine expression can faststone capture download induced simultaneously at early stages of inflammation [15]. Given the variability of macrophage activation states throughout the course of inflammation and tissue repair, it is expected that MSC establish interactions with different macrophage phenotypes and that both pro-inflammatory and anti-inflammatory cytokines influence MSC-mediated immunomodulation. To date, the effects of the cocktail of factors originated from pro-inflammatory or anti-inflammatory macrophage populations on immunomodulatory properties of MSC have not been described.

MSC, like all somatic tissues, express human leukocyte antigens (HLA) class I constitutively and have the ability to express HLA class II when exposed to inflammatory factors. The HLA class I antigens are associated with the activation of CD8+ T lymphocytes while HLA class II antigens are recognized by CD4+ T lymphocytes. MSC appear to evade immune rejection by modulating T cell phenotype and immunosuppressing the local environment. A number of clinical trials involving allogeneic MSC transplantation have shown overall safety and potential effectiveness [16]. MSC have been employed in the clinical treatment of graft-versus-host disease (GvHD) due to their ability to inhibit proliferation and cytotoxic activity of immune system cells. A limited number of clinical trials have reported humoral alloimmunization in human subjects receiving mismatched MSC, but it remains unclear whether this has an impact on their therapeutic efficacy [17]. There is growing interest in combining MSC with hydrogels prepared with extracellular matrix (ECM) proteins that resemble the microenvironments where they reside in order to prolong cell survival, potentiate their function, and prevent rejection by the host [18, 19]. In this work, we extensively investigated the immunomodulatory functions of human MSC activated with secreted factors from human monocyte-derived macrophages polarized toward a pro-inflammatory or an anti-inflammatory phenotype using standard two-dimensional (2D) culture conditions. We focused on the role of TNF-α and IL-10, prototypic pro-inflammatory and anti-inflammatory cytokines, respectively, as priming factors for MSC. Immunoregulatory potential of MSC was evaluated in co-cultures with pro-inflammatory or anti-inflammatory macrophage populations. The assays that led to the most informative data were then performed using MSC encapsulated in collagen hydrogels, which represent a more physiological relevant model.

Methods

Isolation and culture of primary human macrophages

Buffy coats were obtained from 30 healthy blood donors, as anonymously provided by the Comunidad de Madrid Blood Bank (Madrid, Spain). Ethical approvals for all blood sources and processes used in this study were approved by the Human Research Committee of Hospital Universitario La Paz (Date of Approval: 03/06/2015). All experiments AVG Driver Updater 2.7 Crack + Serial Key Free Download 2021 carried out in accordance with the approved guidelines and regulations. Human peripheral blood mononuclear cells (PBMC) were isolated from buffy coats by density gradient centrifugation using Ficoll-Paque Plus (GE Healthcare Bio-sciences, Uppsala, Sweden). For monocyte isolation, PBMC were seeded at a density of 15 × 106/well in six-well plates and allowed to adhere for 1 h in serum-free RPMI (Lonza, Basel, Switzerland). Adherent cells were cultured for 7 days in RPMI supplemented with 10% (v/v) heat-inactivated fetal bovine serum (FBS) and 200 U/ml of granulocyte macrophage-colony stimulating factor (GM-CSF) or 20 ng/ml macrophage-colony stimulating factor (M-CSF) (both from Peprotech, London, UK). Cytokines were added every 2 days. Macrophages generated in the presence of GM-CSF or M-CSF are referred to as MΦGM and MΦM, respectively. Conditioned media (CM) were obtained from MΦGM or MΦM that were treated or not with 10 ng/ml lipopolysaccharide (LPS) (Sigma, Madrid, Spain) for 90 min, washed three times with phosphate-buffered saline (PBS), and cultured in RPMI medium supplemented with 10% FBS for 5 h. The CM were clarified by centrifugation at 1200g for 10 min. The experimental scheme used to generate CM is shown in Fig. 1a.

Immunomodulatory effects of MSC primed with CM from macrophages. a Scheme used to generate conditioned media (CM) from macrophages (upper row). MΦGM or MΦM were treated (CMGM or CMM, respectively) or not (CMGM− or CMM−, respectively) with LPS for 90 min, thoroughly washed with PBS to remove LPS, and incubated in fresh media for 5 h. Scheme of the set-up of co-cultures (lower row). MSC were incubated or not with CM from macrophages or with cytokines for 48 h, thoroughly washed with PBS, and co-cultured with MΦGM or MΦM in the presence of LPS for 24 h. b Levels of inflammatory cytokines in CM of MΦGM or MΦM stimulated or not with LPS. Number of MΦGM (c) or MΦM (d) cultured in isolation or co-cultured with MSC primed or not (−) with CM (left graphs) and levels of TNF-α (middle graphs) and IL-10 (right graphs) in media. *p < 0.05. N.D., not detected

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MSC culture and co-culture with macrophages

Purified human bone marrow-derived MSC were purchased from Lonza and expanded in a defined medium (Lonza) consisting of basal medium and supplement mix. All experiments were performed between passages 5 and 7 using cells isolated from six different donors aged 18–30 years. 105 MSC were seeded in the upper chamber of a 24-mm-diameter transwell insert with 0.4-μm pores (Corning, Lowell, MA, USA) and incubated for 48 h in 3 ml of DMEM supplemented with 15% (v/v) heat-inactivated FBS or in 3 ml of a mixture of equal volumes of DMEM with 15% FBS and CM from macrophages. When indicated and prior to addition to MSC, CM were incubated for 1 h at 37 °C with 1 μg/ml neutralizing antibody against TNF-α or IL-10 (Biolegend, San Diego, CA, USA). Parallel sets of MSC were treated for 48 h with 1 or 10 ng/ml TNF-α, 0.1 or 1 ng/ml IL-10, or combinations of both cytokines (Peprotech). These doses were selected based on the concentrations of TNF-α and IL-10 in the mixtures of DMEM and CM from LPS-stimulated MΦGM or MΦM used for MSC treatments. MSC treated with CM or cytokines are referred to as primed MSC. The transwells with unprimed or primed MSC were washed with PBS and transferred to six-well plates containing cultures of MΦGM or MΦM and incubated for 24 h in 3 ml of a mixture of equal volumes of RPMI and DMEM containing 12.5% FBS and 10 ng/ml LPS. When indicated, 1 μg/ml antibody against PGE2 (Cayman Chemical Company, Ann Arbor, MI, USA) or IL-6 (R&D Systems, Wiesbaden, Germany) was added along with LPS. At the end of the incubation period, the number of live macrophages was determined by the trypan blue dye exclusion test. The experimental scheme used for setting co-cultures is shown in Fig. 1a. In some experiments, 105 MSC were seeded in 12-well plates and incubated with CM or cytokines as described above. After 48 h, MSC were washed with PBS and further incubated for 24 h in fresh culture media, as shown in the experimental scheme in Fig. 4a. Download grapher 12.7.855 full crack - Free Activators assess that MSC modulate cytokine secretion of stimulated macrophages in the absence of LPS, macrophages were treated with LPS for 90 min, washed with PBS, and then co-cultured with MSC for 5 h in fresh media (see experimental scheme in Additional file 1: Figure S2).

Collagen gel co-cultures

Hydrogels (HG) containing 1.5 mg/ml collagen were prepared by mixing at 4 °C 40 μl of 10X DMEM, 10 μl of 1 N NaOH, 162 μl of H2O, 8 μl of 7.5% NaHCO3, 100 μl of serum-free DMEM, easy invoice software 180 μl of 5 mg/ml rat-tail type I collagen diluted in 0.1 M acetic acid (Ibidi GmbH, Martinsried, Germany). 105 MSC, previously treated or not for 48 h with CM, were resuspended in 100 μl of serum-free DMEM and added to the solution. HG-lacking cells were used as controls. After homogenizing the mixture by pipetting, 600 μl of suspension were distributed per well of 24-well plates and incubated at 37 °C for 30 min. After polymerization, 600 μl of RPMI supplemented with 25% (v/v) FBS were added and 2 × 105GM or MΦM were seeded onto HG loaded or not with MSC. Then, HG media were supplemented with 10 ng/ml LPS and incubated for 24 h. For comparative purposes, macrophages were seeded on 24-well plates made of tissue culture plastic (TCP) and incubated for 24 h in 1200 μl of a mixture of equal volumes of RPMI and DMEM containing 12.5% FBS and 10 ng/ml LPS. In the case of MSC, cells were seeded on TCP or encapsulated in HG and further incubated for 24 h in the same media without LPS. The experimental scheme used is shown in Fig. 8a. The cell morphology was observed under a phase-contrast microscope (Nikon Diaphot, Tokio, Japan).

Flow cytometry assays

Immunofluorescence staining of cell surface antigens in MSC was performed by incubating cells for 30 min at 4 °C in the dark with mouse anti-human leukocyte antigen (HLA)-DR, DP, DQ (HLA class II)-FITC, HLA-ABC (HLA class I)-APC, CD34-FITC, CD44-FITC, CD105-PE, CD29-APC, and CD45-APC Abs (all from BD Biosciences, San Jose, CA,USA). Phenotypic characterization of macrophages generated by incubation with GM-CSF or M-CSF was assessed by staining with CD163-PE, CD197 (CCR7)-FITC, and CD80-APC (all from Miltenyi Biotec, Bergisch-Gladbach, Germany). Cells incubated in the absence of antibodies were used as controls. After incubation, cells were washed three times with PBS, fixed with 1% (w/v) formaldehyde in PBS, and analyzed by flow cytometry using a FACSCalibur analyzer and CellQuest software (both from BD Biosciences).

Immunoenzymatic assays

The culture media were clarified by centrifugation at 1200g for 10 min; supplemented with 2 μg/ml aprotinin, 17.5 μg/ml phenyl-methylsulfonyl fluoride, 1 μg/ml pepstatin A, and 50 μg/ml bacitracin (Sigma); and stored at − 80 °C. Levels of TNF-α, IL-10, and IL-6 in cell culture media were determined using BD CBA Flex Sets (BD Biosciences). The data were acquired using a FACSCalibur flow cytometer and analyzed with the FCAP Array Software version 3.0 (BD Biosciences). The detection limits of the CBA Flex Sets were 3.7 pg/ml for TNF-α, 2.5 pg/ml for IL-6, and 3.3 pg/ml for IL-10. PGE2 levels were measured using a human-specific ELISA kit (Cayman) with a detection limit of 15 pg/ml.

Gene expression

Total RNA was isolated using TRI Reagent (Molecular Research Center, Inc., Cincinnati, OH, USA). Complementary DNAs were prepared from total RNA using the Transcriptor Reverse Sandboxie crack - Activators Patch and an anchored-oligo (dT)18 primer (Roche Applied Science, Indianapolis, IN, USA). Real-time quantitative PCR was performed using LightCycler FastStart DNA Master SYBR Keyword researcher pro review - Free Activators I and LightCycler detector (Roche). Quantitative expression values were extrapolated from standard curves and were normalized to glyceraldehyde 3-phosphate dehydrogenase (GAPDH) values. Specific oligonucleotide primers were IL-6, 5′-CCCCAGGAGAAGATTCCAAA-3′ (forward primer, F), 5′-CCAGTGATGATTTTCACCAGG-3′ (reverse primer, R); cyclooxygenase-2 (COX-2), 5′-TGAGCATCTACGGTTTGCTG-3′ (F), 5′-TGCTTGTCTGGAACAACTGC-3′ (R); and GAPDH, 5′-GTGAAGGTCGGAGTCAACG-3′ (F), 5′-GAAGATGGTGATGGGATTTCC-3′ (R).

Statistical analysis

The statistical analyses were performed using the Statistical Program for Social Sciences version 11.5 (SPSS Inc., Chicago, IL, USA). Data are presented as means ± SD of six independent experiments. Quantitative data were tested using two-sided Kruskal-Wallis and Mann-Whitney U rank-sum tests. Post hoc comparisons were analyzed by the Mann-Whitney U test, adjusting the p value with the Bonferroni correction, and the level of significance was set to p < 0.05.

Results

Priming MSC with factors secreted by pro-inflammatory or anti-inflammatory macrophages enhances their immunomodulatory potential

We primed MSC with CM from MΦGM or MΦM stimulated or not with LPS to examine the influence of inflammatory cytokines on MSC immunomodulatory potential (Fig. 1a). MΦGM expressed the M1 markers CD80 and CCR7 whereas they were devoid of cell surface CD163, a marker of M2 macrophages. In contrast, MΦM expressed high levels of CD163 and very low levels of CD80 and CCR7 (Additional file 1: Figure S1). The concentrations of inflammatory cytokines in the CM from MΦGM or MΦM correlated with their pro-inflammatory or anti-inflammatory phenotype, respectively (Fig. 1b). CM from LPS-stimulated MΦGM (CMGM) contained higher levels of TNF-α and IL-6 and lower levels of IL-10 than CM from LPS-stimulated MΦM (CMM). IL-10 levels could not be detected in CM from unstimulated macrophages, which contained low concentrations of TNF-α and IL-6 (Fig. 1b). To evaluate their immunomodulatory potential, MSC primed or not with CM were co-cultured with MΦGM or MΦM as shown in Fig. 1a. MSC did not affect macrophage viability, as numbers of live MΦGM or MΦM cultured in isolation or co-cultured with primed or unprimed MSC were similar (Fig. 1c, d, left panels). Co-culture of MΦGM with unprimed MSC decreased TNF-α levels, an effect also observed in co-cultures of MΦM (Fig. 1c, d, middle panels). MSC primed with CM from unstimulated macrophages had no effect on TNF-α secretion from MΦGM or MΦM (Fig. 1c, d, middle panels). However, MSC primed with CM from LPS-stimulated macrophages further decreased TNF-α levels in co-cultures and no differences were found between priming with CMGM or CMM (Fig. 1c, d, middle panels). The low IL-10 levels secreted by MΦGM were not altered when co-cultured with unprimed MSC or CMM-primed MSC but increased in co-cultures with CMGM-primed MSC (Fig. 1c, right panels). IL-10 production by MΦM was notably reduced in co-cultures with unprimed MSC (Fig. 1d, right panels). However, this reduction was not observed when MSC were primed with CMGM or CMM. As observed for TNF-α, IL-10 levels in co-cultures were unaffected by priming MSC with CM from unstimulated macrophages (Fig. 1c, d, right panels). To assess that MSC can modulate TNF-α and IL-10 secretion of stimulated macrophages in the absence of LPS, macrophages were treated with LPS, washed, and then co-cultured with MSC in fresh media (Additional file 1: Figure S2). Under these conditions, MSC decreased TNF-α levels in co-cultures with MΦGM or MΦM and priming MSC with CMGM or CMM increased their immunomodulatory properties, as observed in co-cultures treated with LPS. Also, changes in IL-10 levels induced by MSC were similar in co-cultures with or without LPS. Taken together, our data show that MSC primed with Easeus data recovery wizard license software from LPS-stimulated macrophages, which contain high levels of inflammatory mediators, display greater immunomodulatory potential than unprimed MSC.

TNF-α and IL-10 in CM from macrophages are involved in priming MSC

We next investigated the role of the pro-inflammatory TNF-α and the anti-inflammatory IL-10 cytokines as priming factors for MSC. For this purpose, CM from macrophages were incubated with neutralizing TNF-α or IL-10 antibody before being Apeaksoft iPhone Data Recovery Registration key to MSC. Treatment of CMGM or CMM with anti-TNF-α reduced the ability of primed MSC to decrease TNF-α levels in co-cultures of MΦGM (Fig. 2a, left panel). Interestingly, a modulatory effect on TNF-α secretion was also observed when CMM, which contained high IL-10 amounts, were treated with anti-IL-10. IL-10 secretion induced by CMGM-primed MSC in co-cultures of MΦGM was attenuated when CM were incubated with anti-TNF-α (Fig. 2a, right panel). Neutralization of IL-10 in CMGM had no effect on TNF-α and IL-10 levels (Fig. 2a). To further investigate the effect of TNF-α and IL-10 on MSC, cells were incubated with these cytokines before co-culturing with MΦGM (Fig. 2b). IL-10 at 0.1 ng/ml had no effect on MSC immunomodulation. TNF-α levels in co-cultures were also unaffected by priming MSC with either IL-10 or TNF-α at 1 ng/ml, but decreased after incubation with both cytokines (Fig. 2b, left panel). Priming MSC with 10 ng/ml TNF-α diminished TNF-α levels in co-cultures, which further decreased when MSC were primed with 10 ng/ml TNF-α plus 1 ng/ml IL-10. Finally, IL-10 levels in co-cultures increased only when MSC were primed with 10 ng/ml TNF-α, alone or in combination with IL-10 (Fig. 2b, right panel). Regarding co-cultures of MΦM, neutralization of TNF-α in CMGM or CMM reduced the ability of keyword researcher pro review - Free Activators MSC to modulate TNF-α levels without affecting IL-10 (Fig. 3a). Moreover, blocking IL-10 in CMM suppressed the regulatory effects of primed MSC. Priming effects of TNF-α on MSC in co-cultures of MΦM increased when 1 ng/ml IL-10 was added (Fig. 3b, left panel). Notably, IL-10 levels increased when MΦM were co-cultured with MSC primed with 1 ng/ml of IL-10 independently of the presence of TNF-α (Fig. 3b, right panel). Overall, these data indicate that TNF-α and IL-10 secreted from macrophages prime MSC to enhance their immunomodulatory potential.

TNF-α and IL-10 prime MSC to regulate cytokine secretion from pro-inflammatory macrophages. a TNF-α and IL-10 levels in media of MΦGM cultured in isolation or co-cultured with MSC primed or not (−) with CMGM or CMM. CM were incubated or not Wondershare Data Recovery 9.0.6.20 Crack+ Serial Key Free 2020 with neutralizing antibody (Ab) against TNF-α or IL-10. b TNF-α and IL-10 levels in media of MΦGM cultured in isolation or co-cultured with MSC primed or not (−) with the indicated doses of TNF-α, IL-10 or combinations of both cytokines. *p < 0.05

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TNF-α and IL-10 prime MSC to regulate cytokine secretion from anti-inflammatory macrophages. a TNF-α and IL-10 levels in media of MΦM cultured in isolation or co-cultured with MSC primed or not (−) with CMGM or CMM. CM were incubated or not (−Ab) with neutralizing antibody (Ab) against TNF-α or IL-10. b TNF-α and IL-10 levels in media of MΦM cultured in isolation or co-cultured with MSC primed or not (−) with the indicated doses of TNF-α, IL-10 or combinations of both cytokines. *p < 0.05

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Immunomodulatory effects of primed MSC on macrophages are mediated by PGE2

Next, we examined whether the soluble mediators PGE2 and IL-6 are involved in the immunomodulation mediated by primed MSC. Priming MSC with CM resulted in increased secretion of IL-6, which reached higher levels after incubation with CMGM than with CMM (Fig. 4b, left panel). To explore whether TNF-α and IL-10 originated from macrophages play a role in this regulation, CM were incubated with neutralizing antibodies. The increase in IL-6 secretion induced by CMGM or CMM was attenuated by blocking TNF-α but not IL-10. Interestingly, PGE2 production increased to a similar extent in MSC primed with CMGM or CMM and this effect was largely attenuated by neutralizing TNF-α (Fig. 4b, right panel). Blocking IL-10 decreased PGE2 levels secreted by MSC primed with CMM but not with CMGM. Incubation of MSC with TNF-α but not IL-10 induced a dose-dependent increase in IL-6 and PGE2 secretion (Fig. 4c). Notably, MSC primed with TNF-α in combination with high doses of IL-10 secreted higher PGE2 levels than MSC treated with TNF-α alone (Fig. 4c, right panel). This effect was not observed for IL-6 secretion (Fig. 4c, left panel). IL-6 levels were substantially higher in single-cultured MΦGM than in MΦM whereas PGE2 secretion was similar for both macrophage phenotypes (Fig. 5a). Co-culturing with primed or unprimed MSC led to a similar increase in IL-6 levels (Fig. 5a, left panel). PGE2 levels also increased upon co-culturing MΦGM or MΦM with MSC although increased further when MSC were primed with CM (Fig. 5a, right panel). No differences were found between priming with CMGM or CMM. Next, mRNA levels of IL6 and COX2, a key enzyme in PGE2 synthesis, were determined in MSC cultured in isolation or co-cultured with macrophages. IL6 and COX2 mRNA levels in single-cultured MSC correlated with IL-6 and PGE2 secretion profiles (Figs. 5b and 4b). IL6 mRNA levels increased after priming MSC with CM, but to a higher extent with CMGM than with CMM. In contrast, COX2 transcript levels increased to the same Draftable Desktop For Windows after exposure to CMGM or CMM (Fig. 5b). IL6 and COX2 mRNA levels in MSC substantially increased when co-cultured with macrophages. Similar to that observed at the secretion level, COX2 mRNA levels in primed MSC keyword researcher pro review - Free Activators with macrophages were higher than those in unprimed counterparts whereas these differences were not found in IL6 transcript (Fig. 5b). These results indicate that priming with CM may potentiate the secretion of PGE2 from MSC in co-cultures but not of IL-6.

IL-6 and PGE2 secretion by primed MSC. a Scheme of MSC treatment with CM or cytokines. b IL-6 and PGE2 levels in media of MSC primed or not (−) with CMGM or CMM. CM were incubated or not (−Ab) with neutralizing antibody (Ab) against TNF-α or IL-10. c IL-6 and PGE2 levels in media of MSC primed or not with the indicated doses of TNF-α, IL-10 or combinations of both cytokines. *p < 0.05

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IL-6 and PGE2 secretion and mRNA levels in co-cultures of macrophages and primed MSC. a IL-6 and PGE2 levels in media of MΦGM or MΦM cultured in isolation or co-cultured with MSC primed or not (−) with CMGM or CMM. bIL6 and COX2 mRNA fold changes in MSC primed or not with CM and cultured in isolation or co-cultured with MΦGM or MΦM. mRNA data are relative to those measured in unprimed MSC cultured in isolation, which were given the arbitrary value of 1. *p < 0.05

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To examine whether TNF-α and IL-10 secretion from macrophages was regulated by PGE2 and IL-6, co-cultures were incubated with neutralizing antibodies against these mediators. TNF-α levels were similar in co-cultures incubated with anti-PGE2 and in macrophages cultured in isolation (Fig. 6a, b, left panels). In contrast, TNF-α levels in co-cultures treated with anti-IL-6 were lower than in isolated macrophages. The regulation in TNF-α levels induced by MSC primed with CMGM or CMM was suppressed by blocking PGE2 but not IL-6 (Fig. 6a, b, left panels). IL-10 levels in co-cultures were hardly affected by incubation with neutralizing antibodies. The only effect was observed in co-cultures of MΦGM as the increase in IL-10 levels induced by CMGM-primed MSC was attenuated when PGE2 was blocked (Fig. 6a, right panel). These data show that primed MSC co-cultured with macrophages decrease TNF-α levels through the secretion of PGE2. PGE2 is also involved in the regulation of IL-10 in co-cultures of primed MSC with MΦGM but not with MΦM.

Involvement of IL-6 and PGE2 in the regulation of macrophage cytokine secretion by primed MSC. TNF-α and IL-10 levels in media of MΦGM (a) or MΦM (b) cultured in isolation or co-cultured with MSC primed or not (−) with CMGM or CMM. Co-cultures were incubated in the absence or presence of neutralizing antibody (Ab) against IL-6 or PGE2. *p < 0.05

Full size image

Primed MSC encapsulated in collagen hydrogels promote macrophage anti-inflammatory versus pro-inflammatory cytokine secretion

Immune rejection of allogeneic MSC has been associated with an alteration in HLA expression following exposure to inflammatory factors [20, 21]. Cell surface levels of HLA class I increased after treatment of MSC with CM, while no effect was observed for HLA class II (Fig. 7). Expression levels of other cell surface molecules related to MSC identity were not altered by CM treatment (Fig. 7). Encapsulation of MSC in HG has been proposed as a strategy to enhance their survival after transplantation and potentiate their function. We extended our study to explore the immunomodulatory properties of CM-primed MSC encapsulated in collagen HG, where cells are permitted to grow in three dimensions. To this end, MΦGM or MΦM were seeded on HG, loaded or not with MSC, and stimulated with LPS. Macrophages or MSC were also cultured on TCP, as classical 2D cell growth conditions (Fig. 8a). On TCP, most MΦGM acquired a polygonal morphology whereas the majority of MΦM exhibited an elongated spindle-like shape (Fig. 8b). However, both MΦGM and MΦM adopted a rounded shape when seeded on HG, being this morphological change more evident for MΦGM. MSC encapsulated in HG were more spindle shaped than cells cultured on TCP (Fig. 8b). We found that the balance between IL-10 and TNF-α levels secreted from MΦGM or MΦM on HG suffered important alterations compared with TCP and was characterized by higher GoodSync 10.9.10.5 Serial Key - Free Activators to TNF-α ratio (Fig. 8c). PGE2 secretion from unprimed or primed MSC loaded in HG was higher than on TCP (Fig. 8d). As observed on TCP, priming with CM substantially increased PGE2 secretion from MSC in HG (Fig. 8d). This increase was also detected when MΦGM or MΦM were co-cultured on the HG surface (Fig. 8e, f, left panels). Incubation of MSC with CM before encapsulation in HG enhanced their immunomodulatory properties on macrophages. Thus, MΦGM or MΦM cultured on MSC-loaded HG secreted lower TNF-α levels than macrophages cultured on empty HG, an effect further enhanced when MSC were primed with CM (Fig. 8e, f, middle panels). Interestingly, IL-10 secretion from MΦGM increased when HG were loaded with MSC and further increased when MSC were primed with CM (Fig. 8e, right panels). High IL-10 levels secreted by MΦM on HG were unaffected by loading unprimed MSC whereas increased when MSC were primed with CM (Fig. 8f, right panels). In all cases, similar effects were observed by priming MSC with CMGM or CMM. Taken together, these data indicate that MSC encapsulated in HG enhance the ratio of IL-10 to TNF-α levels secreted by Mailbird 2.9.31.0 Crack Registration Code Full Free Download Latest 2021 or MΦM and that these immunoregulatory effects are potentiated by priming MSC with factors secreted by macrophages.

Effect of factors secreted by macrophages on MSC identity. Flow cytometric determinations of the expression of surface markers in MSC primed or not with CMGM or CMM. Gray-filled histograms correspond to cells non incubated with antibodies

Full size image

Regulation of macrophage cytokine secretion by MSC loaded in HG. a Scheme of MSC treatment with CM and cell culture in HG (upper row). Scheme of macrophage culture on HG loaded with MSC primed or not with CM (middle row) or cultured on HG lacking MSC (lower row). b Images of MΦGM or MΦM cultured on TCP or HG and of unprimed MSC cultured on TCP or encapsulated in HG. c Ratio between IL-10 and TNF-α levels in media of MΦGM or MΦM cultured on TCP or HG. d PGE2 levels in media of MSC primed or not with CM and cultured on TCP or encapsulated in HG. PGE2, TNF-α and IL-10 levels in media of MΦGM (e) or MΦM (f) cultured on empty HG or on HG loaded with MSC primed or not with CM. *p < 0.05

Full size image

Discussion

Immunomodulatory effects of MSC are the result of an integrated response to extracellular stimuli, which change during the course of wound healing. MSC require threshold levels of inflammatory factors to activate their immunosuppressive function whereas insufficient MSC activation may contribute to potentiate inflammation [10, 12]. Based on these observations, treatment of MSC with inflammatory factors prior to implantation has emerged as an attractive strategy to boost their immunoregulatory effects, as shown in animal models of colitis, acute myocardial ischemia, GvHD, and tendon and ligament healing [22,23,24,25,26]. Classical pro-inflammatory cytokines released at the early stage of inflammation such as IFN-γ, TNF-α, or IL-1β potentiate paracrine effects of MSC on macrophages [23, 27,28,29]. In this work, we show for the first time that factors originated from pro-inflammatory or anti-inflammatory macrophages enhance immunomodulatory properties of MSC. Our data show that MSC immunomodulation was enhanced by priming MSC with CM from LPS-stimulated MΦGM or MΦM but not by CM from unstimulated macrophages, supporting the notion that MSC are mainly activated by inflammatory factors. Priming MSC with CMGM promoted MΦGM polarization toward an anti-inflammatory phenotype, as evidenced by reduced TNF-α levels and increased IL-10 secretion. Blocking TNF-α in CMGM significantly attenuated the immunomodulatory effects of primed MSC indicating that TNF-α acts as a priming factor for MSC and therefore plays a critical role in MSC and macrophage interactions. Interestingly, MSC primed with CMM reduced TNF-α secretion from MΦGM to a similar extent than MSC primed with CMGM, suggesting that MSC can be activated by the cytokine milieu of damaged and May 26, 2021 - Free Activators tissue. To our knowledge, it remains unclear whether anti-inflammatory factors influences MSC activation. Our data show for the first time that IL-10 originated from anti-inflammatory macrophages contributes to potentiate immunomodulatory functions of MSC. We found that the ability of primed MSC to reduce TNF-α secretion from MΦGM was enhanced by the content of TNF-α and IL-10 in CMM. IL-10 alone was insufficient to potentiate MSC immunomodulation, but enhanced the priming effect of TNF-α. These results indicate that MSC activation by IL-10 is dependent on TNF-α and suggest that IL-10 may act amplifying MSC activation by pro-inflammatory factors rather than as a priming factor. It is interesting to note that besides TNF-α and IL-10, CM contain a large range of soluble factors that may contribute to prime MSC. The optimal timing for MSC delivery remains uncertain and likely depends on the inflammatory environment associated with a specific disease or disorder. MSC administration at the early inflammatory stage, rather than after disease stabilization, seems to better guarantee the achievement of immunosuppressive activity in the case of acute GvHD [30]. However, the repair phase after acute myocardial infarction may be a more favorable time for MSC administration than during the acute injury phase, in which the hostile microenvironment could impair survival of transplanted cells [31]. Data herein suggest that MSC may be effective in modulating the immune response when transplanted at the onset of resolution, when both pro-inflammatory and anti-inflammatory factors are secreted [6], facilitating an effective transition from the pro-inflammatory phase to tissue repair.

MSC-mediated immunomodulation involves a complex network of cytokines as well as cell to cell interactions. PGE2 exert anti-inflammatory effects on macrophages via the cyclic AMP-responsive element (CRE) binding proteins (CREB), which regulate the transcription rates of several immune-related genes, including TNF-α and IL-10, upon binding to CRE present in their promoter regions [32]. More recently, it has been described that IL-6 regulates anti-inflammatory macrophage polarization although underlying mechanism has not been fully elucidated [33, 34]. Using blocking antibodies, we demonstrated that IL-6 and PGE2 mediate the reduction in TNF-α secretion from MΦGM in co-cultures with MSC. Interestingly, CMGM and CMM, which contained high and low levels of pro-inflammatory factors, respectively, were similarly effective in stimulating PGE2 secretion by MSC. This effect may be explained by the IL-10-induced increase in PGE2 levels in the presence of low or high concentrations of TNF-α. In this regard, IL-10 has been shown to enhance MSC activation by other inflammatory factors, as production of IFN-β and IL-10 by regulatory T cells synergistically induced expression of the immunoregulatory factor indoleamine 2,3-dioxygenase (IDO) at the mRNA level in MSC [35]. However, we did not detect IDO protein levels in the media of the various cultures and co-cultures of unprimed or primed MSC (data not shown). Changes in PGE2 secretion in co-cultures paralleled changes in COX2 mRNA levels in MSC indicating that production of this mediator was regulated at the mRNA level. The ability of primed MSC ActivePresenter Crack - Crack Key For U further decrease TNF-α secretion by MΦGM could be attributed to PGE2 but not to IL-6, as indicated in the experiments using neutralizing antibodies against these mediators. These data support the notion that MSC immunomodulatory potential is strongly related to the production of PGE2 and suggest that enhancement of the production of this immunoregulatory factor by anti-inflammatory stimuli occurs at the onset of resolution.

It is interesting to note that co-culturing MΦGM with unprimed MSC or with MSC primed with CMM, which contained low levels of pro-inflammatory factors, failed to increase IL-10 secretion. MSC may require strong activation in a pro-inflammatory milieu to promote anti-inflammatory signatures in MΦGM as MSC primed with CMGM led to increased IL-10 levels in co-cultures. Recent in vitro and in vivo studies show that priming MSC with TNF-α at 10 ng/ml or higher doses favors macrophage polarization toward an anti-inflammatory phenotype [22, 29]. In fact, we detected that blocking TNF-α in CMGM reduced the ability of primed MSC to increase IL-10 secretion from MΦGM and that priming MSC with 10 ng/ml TNF-α alone enhanced IL-10 levels in co-cultures. Reprograming macrophages to an anti-inflammatory phenotype has been shown to be mediated by PGE2 [36]. Supporting this, neutralization of PGE2 in co-cultures of MΦGM and MSC primed with CMGM reduced IL-10 levels. We speculate that PGE2 may promote IL-10 secretion from MΦGM via the CREB signaling pathway, as described in cultures of mouse bone marrow macrophages [37]. Notably, priming MSC with CMM, which increased PGE2 secretion, did not result in increased IL-10 production in co-cultures with MΦGM, indicating that other factors secreted by MSC cooperate with PGE2 in macrophage easeus data recovery wizard license software switching.

Paracrine interactions between MSC and anti-inflammatory macrophages have been scarcely investigated. MSC, primed or not with CM from macrophages, regulated TNF-α secretion from MΦM in a similar way to that observed in co-cultures with MΦGM whereas IL-10 production showed different trends. As observed by others [38], IL-10 levels secreted by MΦM decreased after co-culturing with unprimed MSC. In contrast, MΦM maintained their anti-inflammatory traits when co-cultured with MSC primed with inflammatory factors. These results suggest that the cytokine environment strongly influences the ability of MSC to control anti-inflammatory functions of macrophages, allowing resolution of inflammation or preventing excessive anti-inflammatory activation that could impair tissue healing. Moreover, paracrine effects of MSC on MΦM could be regulated by anti-inflammatory factors secreted in the resolution of inflammation, as suggested by the data from experiments in which MSC were primed with GlassWire Pro 2.3.323 Crack+ Activation Key Free 2021 high concentration of IL-10. It should be mentioned that changes in IL-10 levels in co-cultures of MΦM were independent of the PGE2 content, suggesting that different signaling pathways regulate IL-10 production in pro-inflammatory and anti-inflammatory phenotypes.

Murine MSC upregulated the expression of MHC class II molecules in response to IFN-γ and were rejected after implantation in immunocompetent MHC-mismatched mice [39,40,41]. In human MSC, the expression of both HLA classes I and II increased after treatment with IFN-γ [20]. Our data show that treatment of MSC with CM increased surface expression of HLA class I but not of HLA class II, which could be attributed to an inhibitory effect of factors contained in the CM. For example, transforming growth factor-β (TGF-β) has been shown to reduce IFN-γ-induced expression of HLA class II in human MSC [42]. One approach to improve stem cell-based therapies is the use of biomaterial carriers. Type I collagen HG have been successfully used as drug delivery vehicles for the treatment of long bone fracture and spinal fusion [43]. Moreover, collagen Reflector 2 windows have been explored to increase MSC survival after implantation and prevent immune rejection in vivo [44]. We observed that collagen HG are instructive microenvironments for macrophages and MSC functions as well as for the crosstalk between both cell types. Collagen HG substantially decreased pro-inflammatory activation of MΦGM and potentiated anti-inflammatory activity of MΦM as compared to 2D substrates. Increased PGE2 secretion and greater immunomodulatory activity were observed in MSC cultured in three-dimensional (3D) topographies [45] or in spheroids [46], effects that were attributed to 3D disposition of MSC. Our data suggest that encapsulation of MSC in HG is an effective approach to enhance immunomodulatory properties of MSC. MSC in HG promoted anti-inflammatory switching of MΦGM, as indicated by marked reduction in TNF-α levels and increase in IL-10 production, and sustained MΦM activation characterized by high IL-10 secretion. Priming with CM conferred to MSC loaded in HG greater immunomodulatory potential, promoting MΦGM polarization toward an anti-inflammatory phenotype and supporting MΦM anti-inflammatory activation. Enhanced immunoregulatory effects of primed MSC in HG were probably a result of the substantial increase in PGE2 levels compared to unprimed counterparts. Taken together, our results show that priming MSC with inflammatory factors originated from macrophages enhances their immunomodulatory potential. In fact, recent preclinical data supports the safety of IFN-γ-primed MSC infused in mice and their effectiveness to treat immune-related diseases [23, 47]. Encapsulation of primed MSC in HG could be an effective approach to improve their therapeutic efficacy upon implantation. Further studies are required to elucidate the in vivo immunomodulatory potential of primed MSC loaded in HG.

Conclusions

Factors secreted by pro-inflammatory and anti-inflammatory macrophages activate the immunomodulatory potential of MSC. This was attributed, at least in part, to the priming effect of TNF-α and was associated with an increase in PGE2 production by MSC. We identified that IL-10 secreted from anti-inflammatory macrophages, in combination with other inflammatory factors, activate MSC to secrete PGE2 and potentiate the priming effect of TNF-α. Encapsulation of primed MSC in collagen HG enhances their immunoregulatory function, promoting anti-inflammatory activity of macrophages. These findings contribute to the understanding of the mechanisms by which macrophages polarization dynamics instruct MSC and may provide a basis for the development of novel strategies to enhance MSC immunoregulatory potential.

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$00.00$79.90

per month

Save $ per year

$00.00 billed upon purchase

1200

Keyword lookups / 24 h

700of 700

Keyword suggestions / search

Unlimited

Competitor keywords / search

1200

SERP lookups / 24 h

1500

Tracked keywords daily

15000

Backlink rows monthly

150

Site lookups / 24 h

10

Simultaneous logins

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Get 5 lookups per 24 hours, 25 related and 10 competitor keywords per lookup in a 10 day trial.

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Источник: https://kwfinder.com/

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