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<h2 class="element-invisible">You are here</h2><div class="breadcrumb"><a href="/">Home</a> » <a href="/news-events">News & Events</a> » <a href="/news-events/nih-research-matters">NIH Research Matters</a></div> <div class="l-region l-region--section-header">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2022-06-07T00:00:00-04:00" class="date-display-single">June 7, 2022</span></p><div class='syndicate'><h1>T cells protect against COVID-19 in absence of antibody response</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<li>In studies of mice, immune cells called T cells protected animals against COVID-19 even in the absence of antibodies targeting the SARS-CoV-2 virus.</li>
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<li>Vaccines designed to produce a strong T cell response may be able to help protect against current and future variants of the virus that causes COVID-19.</li>
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</ul></div><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
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<picture title="Illustration of T cells">
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<!--[if IE 9]><video style="display: none;"><![endif]-->
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2022/20220607-tcells.jpg?itok=L3VvYjHv&timestamp=1654609419 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2022/20220607-tcells.jpg?itok=__hzpX0e&timestamp=1654609419 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2022/20220607-tcells.jpg?itok=j1G9d7q1&timestamp=1654609419 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2022/20220607-tcells.jpg?itok=JPtSUmqR&timestamp=1654609419 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2022/20220607-tcells.jpg?itok=UDA8FoRO&timestamp=1654609419 1x" media="screen and (min-width: 0)" />
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<!--[if IE 9]></video><![endif]-->
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2022/20220607-tcells.jpg?itok=__hzpX0e&timestamp=1654609419" alt="Illustration of T cells" title="Illustration of T cells" />
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</picture><span class="caption">The study examined the roles of T cells, illustrated here, in protecting against COVID-19. </span><span class="credit">Design_Cells / Shutterstock</span></div>
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</div><p>Vaccines developed early in the COVID-19 pandemic still provide strong protection against severe disease, hospitalization, and death. But SARS-CoV-2, the virus that causes COVID-19, continues to mutate. Many of these mutations alter the spike protein, which the virus uses to enter and infect cells. These mutations help the virus to dodge the immune system’s attack.</p>
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||
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<p>Current vaccines prompt the creation of antibodies and immune cells that recognize the spike protein. However, these vaccines were developed using the spike protein from an older variant of SARS-CoV-2. This has made them less effective at preventing infection with newer variants. Researchers have found that immune cells called T cells tend to recognize parts of SARS-CoV-2 that don’t mutate rapidly. T cells coordinate the immune system’s response and kill cells that have been infected by the SARS-CoV-2 virus.</p>
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||
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<p>A vaccine that prompted the body to create more T cells against SARS-CoV-2 could help prevent disease caused by a wide range of variants. To explore this approach, an NIH-funded research team led by Dr. Marulasiddappa Suresh from the University of Wisconsin, Madison studied two experimental vaccines that included compounds to specifically provoke a strong T-cell response in mice.</p>
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||
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<p>Using mice that could be infected with SARS-CoV-2, the team tested the vaccines’ ability to control infection and prevent severe disease caused by an earlier strain of SARS-CoV-2 as well as by the Beta variant, which is relatively resistant to antibodies raised against earlier strains. The results appeared on May 17, 2022, in <em>Proceedings of the National Academy of Sciences</em>.</p>
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||
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||
<p>When the researchers vaccinated the mice either through the nose or by injection, the animals developed T cells that could recognize the early SARS-CoV-2 strain and the Beta variant. The vaccines also caused the mice to develop antibodies that could neutralize the early strain. However, they failed to create antibodies that neutralized the Beta variant.</p>
|
||
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||
<p>The team exposed the mice to SARS-CoV-2 around 3 to 5 months after vaccination. Vaccinated mice had very low levels of virus in their lungs compared with unvaccinated mice and were protected against severe illness. This was true of infection with the Beta variant as well. This showed that the vaccine provided protection against the Beta variant despite failing to produce effective antibodies against it.</p>
|
||
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||
<p>To understand which T cells were providing this protection, the researchers selectively removed different types of T cells in vaccinated mice prior to infection. When they removed CD8 (killer) T cells, vaccinated mice remained well protected against the early strain, although not against the Beta variant. When they blocked CD4 T (helper) cells, levels of both the early strain and Beta variant in the lungs and severity of disease were substantially higher than in vaccinated mice that didn’t have their T cells removed.</p>
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||
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||
<p>These results suggest important roles for CD8 and CD4 T cells in controlling SARS-CoV-2 infection. Current mRNA vaccines do produce some T cells that recognize multiple variants. This may help account for part of the observed protection against severe disease from the Omicron variant. Future vaccines might be designed to specifically enhance this T cell response.</p>
|
||
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<p>“I see the next generation of vaccines being able to provide immunity to current and future COVID-19 variants by stimulating both broadly-neutralizing antibodies and T cell immunity,” Suresh says.</p>
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<p>—by Sharon Reynolds</p></div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/intranasal-proteins-could-protect-against-covid-19-variants" target="_top">Intranasal Proteins Could Protect Against COVID-19 Variants</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/antibodies-recognize-new-sars-cov-2-omicron-variant-after-booster" target="_top">Antibodies Recognize New SARS-CoV-2 Omicron Variant After Booster</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/covid-19-immune-response-improves-months-after-vaccination" target="_top">COVID-19 Immune Response Improves for Months After Vaccination</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/covid-19-vaccines-induce-immune-response-omicron" target="_top">COVID-19 Vaccines Induce Immune Response to Omicron</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/moderna-covid-19-vaccine-generates-long-lasting-immune-memory" target="_top">Moderna COVID-19 Vaccine Generates Long-Lasting Immune Memory</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/vaccines-prevented-140000-covid-19-deaths-us" target="_top">Vaccines Prevented Up to 140,000 COVID-19 Deaths in U.S.</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/intranasal-covid-19-vaccine-effective-animal-studies" target="_top">Intranasal COVID-19 Vaccine Effective in Animal Studies</a></li><li><a href="https://covid19.nih.gov/" target="_top">COVID-19 Research</a></li><li><a href="https://www.coronavirus.gov/" target="_top">COVID-19 (CDC)</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://pubmed.ncbi.nlm.nih.gov/35561224/">Vaccine-induced systemic and mucosal T cell immunity to SARS-CoV-2 viral variants.</a> Kingstad-Bakke B, Lee W, Chandrasekar SS, Gasper DJ, Salas-Quinchucua C, Cleven T, Sullivan JA, Talaat A, Osorio JE, Suresh M. <em>Proc Natl Acad Sci U S A</em>. 2022 May 17;119(20):e2118312119. doi: 10.1073/pnas.2118312119. Epub 2022 May 13. PMID: 35561224.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of Allergy and Infectious Diseases (NIAID); John E. Butler Professorship; American Heart Association.</p>
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