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- W4313366355 abstract "Abstract CD4 T cells adapt to their surroundings by differentiating into various T helper (Th) subsets. At steady state, regulatory CD4 T cells (Treg) and interleukin (IL)-17 producing CD4 T cells (Th17 cells) are present in the intestine and localize mainly to the lamina propria, whereas CD4 cytotoxic T lymphocytes (CTL) reside in the epithelium. A hallmark of CD4 CTL is the reactivation of the Cd8 locus and the re-expression of CD8a controlled by the Cd8 enhancer I (E8I). We showed before that CD4 Th cells can reprogram to CTL. Here, we elucidated a mechanism that drives the CTL reprogramming of CD4 Th cells. We identified a long noncoding RNA transcribed from the Cd8 locus, as the critical regulator of the reciprocal expression of T-BET and RUNX combined with the suppression of Foxp3 and Rorc in CD4 CTL precursors. We further found that the E8I region functions as is central coordinator of the RUNX3-controlled cytotoxic gene expression program marked by the re-expression of CD8a. Adoptive transfer of naïve E8I deletion mutant CD4 T cells to Rag1−/− recipient mice led to accelerated weight loss, and severe small and large intestine inflammation with excessive accumulation of pathogenic IL-17A and IL-17A/IFNg double producing CD4 T cells. Altogether, these findings indicate that the Cd8 locus controls the functional polarization of CD4 Th cells and furthermore, that the conversion to CTL not only enhances the direct protective capacity but also regulate the immune response and prevents excessive inflammation and immune pathology at the mucosal border of the intestine." @default.
- W4313366355 created "2023-01-06" @default.
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- W4313366355 date "2019-05-01" @default.
- W4313366355 modified "2023-09-26" @default.
- W4313366355 title "The <i>Cd8</i> locus Controls the Functional Conversion of CD4 Th cells to CD4 CTL in the Intestine" @default.
- W4313366355 doi "https://doi.org/10.4049/jimmunol.202.supp.67.18" @default.
- W4313366355 hasPublicationYear "2019" @default.
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