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J. Exp. Med., Volume 187, Number 2, January 19, 1998 237-244

Tumor Necrosis Factor Receptor-associated Factor 6 (TRAF6) Stimulates Extracellular Signal-regulated Kinase (ERK) Activity in CD40 Signaling Along a Ras-independent Pathway

By Masaki Kashiwada,* Yumiko Shirakata,* Jun-Ichiro Inoue,Dagger Hiroyasu Nakano,§ Kenji Okazaki,par Ko Okumura,§ Tadashi Yamamoto,Dagger Hitoshi Nagaoka,* and Toshitada Takemori*

* Department of Immunology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162, Japan; Dagger  Department of Oncology, The Institute of Medical Science, The University of Tokyo, 4-6-1, Shiroganedai, Minato-ku, Tokyo 108, Japan; § Department of Immunology, School of Medicine, Juntendo University, 2-1-1, Hongo, Bunkyo-ku, Tokyo 113, Japan; par  CREST (Core Research for Evolutional Science and Technology) of Japan Science and Technology Corporation (JST), and  Department of Molecular Biology, Biomolecular Engineering Research Institute, 6-2-3 Furuedai, Suita-shi, Osaka-fu 565, Japan

CD40 activates nuclear factor kappa B (NFkappa B) and the mitogen-activated protein kinase (MAPK) subfamily, including extracellular signal-regulated kinase (ERK). The CD40 cytoplasmic tail interacts with tumor necrosis factor receptor-associated factor (TRAF)2, TRAF3, TRAF5, and TRAF6. These TRAF proteins, with the exception of TRAF3, are required for NFkappa B activation. Here we report that transient expression of TRAF6 stimulated both ERK and NFkappa B activity in the 293 cell line. Coexpression of the dominant-negative H-Ras did not affect TRAF6-mediated ERK activity, suggesting that TRAF6 may activate ERK along a Ras-independent pathway. The deletion mutant of TRAF6 lacking the NH2-terminal domain acted as a dominant-negative mutant to suppress ERK activation by full-length CD40 and suppress prominently ERK activation by a deletion mutant of CD40 only containing the binding site for TRAF6 in the cytoplasmic tail (CD40Delta 246). Transient expression of the dominant-negative H-Ras significantly suppressed ERK activation by full-length CD40, but marginally suppressed ERK activation by CD40Delta 246, compatible with the possibility that TRAF6 is a major transducer of ERK activation by CD40Delta 246, whose activity is mediated by a Ras-independent pathway. These results suggest that CD40 activates ERK by both a Ras-dependent pathway and a Ras-independent pathway in which TRAF6 could be involved.


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