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The oncoprotein and transcriptional regulator Bcl-3 governs plasticity and pathogenicity of auto-immune T cells #MMPMID25367572
Tang W; Wang H; Claudio E; Tassi I; Ha Hl; Saret S; Siebenlist U
Immunity 2014[Oct]; 41 (4): 555-66 PMID25367572show ga
Bcl-3 is an atypical member of the I?B family that modulates transcription in the nucleus via association with p50 (NF-?B1) or p52 (NF-?B2) homodimers. Despite evidence attesting to the overall physiologic importance of Bcl-3, little is known about its cell-specific functions or mechanisms. Here we demonstrate a T cell-intrinsic function of Bcl-3 in autoimmunity. Bcl-3-deficient T cells failed to induce disease in T cell transfer-induced colitis and experimental autoimmune encephalomyelitis. The protection against disease correlated with a decrease in Th1 cells that produced the cytokines IFN?- and GM-CSF, and an increase in Th17 cells. Although differentiation into Th1 cells was not impaired in the absence of Bcl-3, differentiated Th1 cells converted to less pathogenic Th17-like cells, in part via mechanisms involving expression of the ROR?t transcription factor. Thus, Bcl-3 constrained Th1 cell plasticity and promoted pathogenicity by blocking conversion to Th17-like cells, revealing a unique type of regulation that shapes adaptive immunity.