[HTML][HTML] Limited induction of polyfunctional lung-resident memory T cells against SARS-CoV-2 by mRNA vaccination compared to infection

DKJ Pieren, SG Kuguel, J Rosado, AG Robles… - Nature …, 2023 - nature.com
DKJ Pieren, SG Kuguel, J Rosado, AG Robles, J Rey-Cano, C Mancebo, J Esperalba…
Nature Communications, 2023nature.com
Resident memory T cells (TRM) present at the respiratory tract may be essential to enhance
early SARS-CoV-2 viral clearance, thus limiting viral infection and disease. While long-term
antigen-specific TRM are detectable beyond 11 months in the lung of convalescent COVID-
19 patients, it is unknown if mRNA vaccination encoding for the SARS-CoV-2 S-protein can
induce this frontline protection. Here we show that the frequency of CD4+ T cells secreting
IFNγ in response to S-peptides is variable but overall similar in the lung of mRNA-vaccinated …
Abstract
Resident memory T cells (TRM) present at the respiratory tract may be essential to enhance early SARS-CoV-2 viral clearance, thus limiting viral infection and disease. While long-term antigen-specific TRM are detectable beyond 11 months in the lung of convalescent COVID-19 patients, it is unknown if mRNA vaccination encoding for the SARS-CoV-2 S-protein can induce this frontline protection. Here we show that the frequency of CD4+ T cells secreting IFNγ in response to S-peptides is variable but overall similar in the lung of mRNA-vaccinated patients compared to convalescent-infected patients. However, in vaccinated patients, lung responses present less frequently a TRM phenotype compared to convalescent infected individuals and polyfunctional CD107a+ IFNγ+ TRM are virtually absent in vaccinated patients. These data indicate that mRNA vaccination induces specific T cell responses to SARS-CoV-2 in the lung parenchyma, although to a limited extend. It remains to be determined whether these vaccine-induced responses contribute to overall COVID-19 control.
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