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Resident help for fighting influenza
Memory T cells take up residence in the lung after respiratory virus infection to facilitate rapid and localized immune responses during reinfection. Two studies in this week’s issue identify a population of CD4+ tissue-resident helper T cells in mice that are BCL6-dependent and support antiviral B cell responses within inducible bronchus-associated lymphoid tissue after influenza infection. Swarnalekha et al. used single-cell RNA sequencing of antigen-specific T cells across different tissues to characterize lung T resident helper cells and demonstrated that their development also requires B cells. Son et al. showed that T resident helper cells rely on Bhlhe40 for their survival and support protective CD8+ T cell responses by producing IL-21. These studies provide insight into the function of mucosal tissue-resident CD4+ T cells during viral infection. See related Research Article by Son et al. and Focus by Schattgen et al. in this issue.
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