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TRAF6 mediates Smad-independent activation of JNK and p38 by TGF-beta.


ABSTRACT: In many physiological and disease processes, TGF-beta usurps branches of MAP kinase pathways in conjunction with Smads to induce apoptosis and epithelial-to-mesenchymal transition, but the detailed mechanism of how a MAP kinase cascade is activated by TGF-beta receptors is not clear. We report here that TRAF6 is specifically required for the Smad-independent activation of JNK and p38, and its carboxyl TRAF homology domain physically interacts with TGF-beta receptors. TGF-beta induces K63-linked ubiquitination of TRAF6 and promotes association between TRAF6 and TAK1. Our results indicate that TGF-beta activates JNK and p38 through a mechanism similar to that operating in the interleukin-1beta/Toll-like receptor pathway.

SUBMITTER: Yamashita M 

PROVIDER: S-EPMC2621323 | biostudies-literature | 2008 Sep

REPOSITORIES: biostudies-literature

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TRAF6 mediates Smad-independent activation of JNK and p38 by TGF-beta.

Yamashita Motozo M   Fatyol Karoly K   Jin Chaoyang C   Wang Xiangchun X   Liu Zhenggang Z   Zhang Ying E YE  

Molecular cell 20080901 6


In many physiological and disease processes, TGF-beta usurps branches of MAP kinase pathways in conjunction with Smads to induce apoptosis and epithelial-to-mesenchymal transition, but the detailed mechanism of how a MAP kinase cascade is activated by TGF-beta receptors is not clear. We report here that TRAF6 is specifically required for the Smad-independent activation of JNK and p38, and its carboxyl TRAF homology domain physically interacts with TGF-beta receptors. TGF-beta induces K63-linked  ...[more]

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