Tissue-resident memory T (TRM) cells exert antiviral effects in situ using a variety of cell-intrinsic mechanisms. In this issue of Mucosal Immunology, Rosato and colleagues demonstrate that mucosal CD8 TRM cells can also facilitate the extravasation of antibodies with neutralizing capacities by modulating transcytotic receptors and vascular permeability, thus revealing a new mechanism by which TRM cells modulate humoral responses and protect the host from incoming pathogens.
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