Journal
NATURE AGING
Volume 2, Issue 10, Pages 896-+Publisher
SPRINGERNATURE
DOI: 10.1038/s43587-022-00292-y
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Funding
- Alexander von Humboldt Foundation
- RESIST cluster of excellence
- German Research Foundation [EXC 2155, 390874280]
- European Union [GRK 2485]
- Ministry of Science and Culture of Lower Saxony, Germany [848166]
- Hannover Biomedical Research School [14-76103-184]
- Center for Infection Biology
- Ministry of Economics of Lower Saxony
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This observational study found decreased immune responses to the SARS-CoV-2 mRNA vaccine in older adults, which correlated with age-related immunosenescence. Older adults showed a preference for T cell response to the S2 region of the Spike protein. Age-related changes did not affect memory T cell responses to influenza virus or the SARS-CoV-2-specific response induced by infection.
Vaccination against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is effective in preventing COVID-19 hospitalization and fatal outcome. However, several studies indicated that there is reduced vaccine effectiveness among older individuals, which is correlated with their general health status(1,2). How and to what extent age-related immunological defects are responsible for the suboptimal vaccine responses observed in older individuals receiving SARS-CoV-2 messenger RNA vaccine, is unclear and not fully investigated(1,3-5). In this observational study, we investigated adaptive immune responses in adults of various ages (22-99 years old) receiving 2 doses of the BNT162b2 mRNA vaccine. Vaccine-induced Spike-specific antibody, and T and memory B cell responses decreased with increasing age. These responses positively correlated with the percentages of peripheral naive CD4(+) and CD8(+) T cells and negatively with CD8(+) T cells expressing signs of immunosenescence. Older adults displayed a preferred T cell response to the S2 region of the Spike protein, which is relatively conserved and a target for cross-reactive T cells induced by human 'common cold' coronaviruses. Memory T cell responses to influenza virus were not affected by age-related changes, nor the SARS-CoV-2-specific response induced by infection. Collectively, we identified signs of immunosenescence correlating with the outcome of vaccination against a new viral antigen to which older adults are immunologically naive. This knowledge is important for the management of COVID-19 infections in older adults.
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