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Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Immunol 2016 ; 17 (7): 825-33 Nephropedia Template TP
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A TRAF-like motif of ICOS controls development of germinal center T follicular helper cells via TBK1 #MMPMID27135603
Pedros C; Zhang Y; Hu JK; Choi YS; Canonigo-Balancio AJ; Yates JR; Altman A; Crotty S; Kong KF
Nat Immunol 2016[Jul]; 17 (7): 825-33 PMID27135603show ga
Inducible costimulator (ICOS) signaling fuels the stepwise development of T follicular helper (TFH) cells. However, a signaling pathway unique to ICOS has not been identified. We show that TANK-binding kinase 1 (TBK1) associates with ICOS via a conserved motif, IProx, which shares homology with tumor necrosis factor receptor (TNFR)-associated factors, TRAF2 and TRAF3. Disruption of this motif abolishes the association with TBK1, thus identifying a TBK1-binding consensus. Mutation of this motif in ICOS, or depletion of TBK1 in T cells severely impaired the differentiation of germinal center (GC) TFH, B cell and antibody responses, but was dispensable for early TFH differentiation. These results reveal a novel ICOS-TBK1 signaling pathway that specifies GC TFH cell commitment.