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Free keywords:
LCMV; innate lymphoid cells; salivary glands; tissue-resident memory T cells
Abstract:
NK1.1+ cells found in salivary glands (SG) represent a unique cell population of innate lymphoid cells (ILC) with characteristics of both conventional NK cells and ILC1. Here, we demonstrate that these NK1.1+ cells limit the accumulation and differentiation of virus‐specific tissue‐resident memory CD8+ T cells (TRM cells) in SG of mice infected with lymphocytic choriomeningitis virus (LCMV). The negative regulation of LCMV‐specific CD8+ TRM cells by NK1.1+ cells in SG is independent of NKG2D, NKp46, TRAIL, and perforin. Moreover, analysis of NKp46iCre+Eomesfl/fl mice revealed that Eomes‐dependent conventional NK cells are dispensable for negative regulation. Since the SG are prone to autoimmune reactions, regulation of TRM cells by tissue‐resident ILC may be particularly important to prevent immunopathology in this organ.