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TRANCE, a TNF family member, activates Akt/PKB through a signaling complex involving TRAF6 and c-Src.

Authors:
Wong BR, Besser D, Kim N, Arron JR, Vologodskaia M, Hanafusa H, Choi Y
Affiliation:
Journal:
Molecular cell

Abstract

TRANCE, a TNF family member, and its receptor, TRANCE-R, are critical regulators of dendritic cell and osteoclast function. Here, we demonstrate that TRANCE activates the antiapoptotic serine/threonine kinase Akt/PKB through a signaling complex involving c-Src and TRAF6. A deficiency in c-Src or addition of Src family kinase inhibitors blocks TRANCE-mediated PKB activation in osteoclasts. c-Src and TRAF6 interact with each other and with TRANCE-R upon receptor engagement. TRAF6, in turn, enhances the kinase activity of c-Src leading to tyrosine phosphorylation of downstream signaling molecules such as c-Cbl. These results define a mechanism by which TRANCE activates Src family kinases and PKB and provide evidence of cross-talk between TRAF proteins and Src family kinases.

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