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TH17 cells require ongoing classic IL-6 receptor signaling to retain transcriptional and functional identity

Stacey N Harbour1, Daniel F DiToro1, Steven J Witte1

  • 1Department of Pathology, University of Alabama at Birmingham, Birmingham, AL 35294, USA.

Science Immunology
|July 19, 2020
PubMed

Acting in concert with TGF-β, interleukin-6 (IL-6) signaling induces T helper 17 (TH17) cell development by programming TH17-related genes via signal transducers and activators of transcription 3 (STAT3). A role for IL-6 signaling beyond the inductive phase of TH17 cell development has not been defined because IL-23 signaling downstream of TH17 cell induction also activates STAT3 and is thought responsible for TH17 cell maintenance. Here, we find that IL-6 signaling is required for both induction and maintenance of mouse TH17 cells; IL-6Rα-deficient TH17 cells rapidly lost their TH17 phenotype and did not cause disease in two models of colitis. Cotransfer of wild-type TH17 cells with IL-6Rα-deficient TH17 cells induced colitis but was unable to rescue phenotype loss of the latter. High IL-6 expression in the colon promoted classic, or cis, rather than transreceptor signaling that was required for maintenance of TH17 cells. Thus, ongoing classic IL-6 signaling underpins the TH17 program and is required for TH17 cell maintenance and function.

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