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Schmidt, Tilman; Luebbe, Jonas; Kilian, Christoph; Riedel, Jan-Hendrik; Hiekmann, Sonja; Asada, Nariaki; Ginsberg, Pauline; Robben, Lennart; Song, Ning; Kaffke, Anna; Peters, Anett; Borchers, Alina; Flavell, Richard A; Gagliani, Nicola; Pelzcar, Penelope; Huber, Samuel; Huber, Tobias B; Turner, Jan-Eric; Paust, Hans-Joachim; Krebs, Christian F; Panzer, Ulf
Journal of the American Society of Nephrology, 12/2021, Volume: 32, Issue: 12Journal Article
IL-17A-producing CD4 T helper (T 17) cells play a critical role in autoimmune and chronic inflammatory diseases, such as crescentic GN. The proinflammatory effects of IL-17 are mediated by the activation of the IL-17RA/IL-17RC complex. Although the expression of these receptors on epithelial and endothelial cells is well characterized, the IL-17 receptor expression pattern and function on hematopoietic cells, , CD4 T cell subsets, remains to be elucidated. Crescentic GN (nephrotoxic nephritis) was induced in IL-17A, IFN , and Foxp3 triple-reporter mice for sorting of renal CD4 T cell subsets and subsequent single-cell RNA sequencing. Moreover, we generated T 17 cell-specific IL-17RA and IL-17RC gene-deficient mice and studied the functional role of IL-17 signaling in T 17 cells in crescentic GN, imiquimod-induced psoriasis, and in the CD4 CD45RB T cell transfer colitis model. We identified a specific expression of the IL-17 receptor A/C complex on CD4 T 17 cells. Single-cell RNA sequencing of T 17 cells revealed the activation of the IL-17 receptor signaling pathway in experimental crescentic GN. Disruption of the IL-17RC signaling pathway in CD4 T cells and, most importantly, specifically in CD4 T 17 cells, potentiates the IL-17 cytokine response and results in an accelerated course of experimental crescentic GN. Comparable results were observed in experimental models of psoriasis and colitis. Our findings indicate that IL-17 receptor C signaling has a previously unrecognized function in the regulation of CD4 T 17 cells and in the control of organ-specific autoimmunity and might provide new insights into the development of more efficient anti-T 17 treatment strategies.
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