Cited by 416SARS-CoV-2 and COVID-19 ResearchImmune responses and vaccinationsT-cell and B-cell Immunology

Virus-specific memory CD8 T cells provide substantial protection from lethal severe acute respiratory syndrome coronavirus infection

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Channappanavar, Rudragouda, Fett, Craig, Zhao, Jincun, Meyerholz, David K., Perlman, Stanley·2014·Journal of Virology

Abstract

UNLABELLED: Severe acute respiratory syndrome coronavirus (SARS-CoV) caused an acute human respiratory illness with high morbidity and mortality in 2002-2003. Several studies have demonstrated the role of neutralizing antibodies induced by the spike (S) glycoprotein in protecting susceptible hosts from lethal infection. However, the anti-SARS-CoV antibody response is short-lived in patients who have recovered from SARS, making it critical to develop additional vaccine strategies. SARS-CoV-specific memory CD8 T cells persisted for up to 6 years after SARS-CoV infection, a time at which memory B cells and antivirus antibodies were undetectable in individuals who had recovered from SARS. In this study, we assessed the ability of virus-specific memory CD8 T cells to mediate protection against infection in the absence of SARS-CoV-specific memory CD4 T or B cells. We demonstrate that memory CD8 T cells specific for a single immunodominant epitope (S436 or S525) substantially protected 8- to 10-month-old mice from lethal SARS-CoV infection. Intravenous immunization with peptide-loaded dendritic cells (DCs) followed by intranasal boosting with recombinant vaccinia virus (rVV) encoding S436 or S525 resulted in accumulation of virus-specific memory CD8 T cells in bronchoalveolar lavage fluid (BAL), lungs, and spleen. Upon challenge with a lethal dose of SARS-CoV, virus-specific memory CD8 T cells efficiently produced multiple effector cytokines (gamma interferon [IFN-γ], tumor necrosis factor alpha [TNF-α], and interleukin 2 [IL-2]) and cytolytic molecules (granzyme B) and reduced lung viral loads. Overall, our results show that SARS-CoV-specific memory CD8 T cells protect susceptible hosts from lethal SARS-CoV infection, but they also suggest that SARS-CoV-specific CD4 T cell and antibody responses are necessary for complete protection. IMPORTANCE: Virus-specific CD8 T cells are required for pathogen clearance following primary SARS-CoV infection. However, the role of SARS-CoV-specific memory CD8 T cells in mediating protection after SARS-CoV challenge has not been previously investigated. In this study, using a prime-boost immunization approach, we showed that virus-specific CD8 T cells protect susceptible 8- to 10-month-old mice from lethal SARS-CoV challenge. Thus, future vaccines against emerging coronaviruses should emphasize the generation of a memory CD8 T cell response for optimal protection.

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  • Anti-S T-cell responses to SARS- and MERS-CoVs contribute toward viral clearance in normal as well as aged mice infected with SARS- or MERS-CoV, respectively.

    “anti-S T-cell responses to the related SARS- and MERS-CoVs contribute toward viral clearance in normal as well as aged mice infected with SARS- or MERS-CoV, respectively (43–45).”

    From An <i>Alphavirus</i> -derived replicon RNA vaccine induces SARS-CoV-2 neutralizing antibody and T cell responses in mice and nonhuman primates (2020) · cites this paper as [45]

    The Results report that responses to the SARS-CoV spike epitopes S436 and S525 accelerated viral clearance in 8- to 10-month-old mice. The Discussion says virus-specific CD8 T cells are important for MERS-CoV clearance, but does not establish that those cells target spike or that the finding applies to both young and aged MERS-CoV-infected mice. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Memory T cells, particularly those residing at the upper airways, might limit disease severity and shorten the duration of disease by rapidly eliminating infected cells and coordinating the production of antibodies.

    “Memory T cells, particularly those residing at the upper airways might limit disease severity and shorten the duration of disease by rapidly eliminating infected cells and coordinating the production of antibodies [67]”

    From The dawn of mRNA vaccines: the COVID-19 case (2021) · cites this paper as [67]

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Authors
Channappanavar, R., Fett, C., Zhao, J., Meyerholz, D. K., & Perlman, S.
Affiliations
University of Iowa (US)
Venue
Journal of Virology
Published
2014-10
Volume
88
Issue
19
Pages
11034-11044
ISSN
  • 0022-538X (ISSN-L)
  • 1098-5514
OpenAlex
W2004583429
Cited by
411
References
53
Citations by year
2026: 8 · 2025: 14 · 2024: 14 · 2023: 39 · 2022: 51 · 2021: 117 · 2020: 142 · 2019: 3 · 2018: 6 · 2017: 4 · 2016: 6 · 2015: 3 · 2014: 3
FWCI
3.75
Type
journal article
Language
en
Open access
Locations
  • Journal of Virology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (AI060699)
  • National Institute of Allergy and Infectious Diseases (AI091322, R01AI091322, AI060699, P01AI060699)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P30DK054759)
Topics
  • Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
  • Life Sciences › Immunology and Microbiology › Immunology › Immune responses and vaccinations
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
Keywords
SARS-CoV, memory CD8+ T cells, T cell immunity, immunodominant epitopes, spike protein, prime-boost vaccination, peptide-loaded dendritic cells, vaccinia virus vector, lung viral load, cytokine production, granzyme B
MeSH terms
Animals, Antibodies, Viral, Antigens, Viral, Dendritic Cells, Female, Humans, Immunity, Active, Immunity, Cellular, Immunization, Immunologic Memory, Peptides, CD4-Positive T-Lymphocytes, Gene Expression, Survival Analysis, CD8-Positive T-Lymphocytes, Epitopes, T-Lymphocyte, Severe Acute Respiratory Syndrome, Severe acute respiratory syndrome-related coronavirus, Mice, Immunity, Humoral

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