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Tonic TCR and IL-1β signaling mediate phenotypic alterations of naive CD4 + T cells.
Cell Reports 2024 March 16
Inert naive CD4+ T (TN ) cells differentiate into functional T helper (Th) or regulatory T (Treg) cell subsets upon encountering antigens, mediating properly directed immune responses. Although all TN cells can differentiate into any of the Th and Treg cell subsets, heterogeneity exists among TN cells. By constructing reporter mice to detect ongoing T cell receptor (TCR) signaling, we identify that interleukin (IL)-1β signaling affects TN cell characteristics, independent of tonic TCR signaling, which also alters TN cell phenotypes. IL-1β reversibly attenuates the differentiation potential of TN cells toward Treg cells. IL-1β signaling is elevated in the splenic TN cells, consequently attenuating their differentiation potential toward Treg cells. Aberrant elevation of IL-1β signaling augments colitogenic activities of TN cells. TN cells in patients with colitis exhibited elevated IL-1β signaling. We demonstrate that phenotypic alteration in TN cells by IL-1β is an important mechanism in the regulation of immune responses.
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