Restoration of NF-κB activation by tumor necrosis factor alpha receptor complex-targeted MEKK3 in receptor-interacting protein-deficient cells

被引:37
作者
Blonska, M
You, Y
Geleziunas, R
Lin, X
机构
[1] SUNY Buffalo, Dept Microbiol & Immunol, Sch Med & Biomed Sci, Buffalo, NY 14214 USA
[2] Merck Res Labs, W Point, PA USA
关键词
D O I
10.1128/MCB.24.24.10757-10765.2004
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Receptor-interacting protein (RIP) plays a critical role in tumor necrosis factor alpha (TNF-alpha)-induced NF-kappaB activation. However, the mechanism by which RIP mediates TNF-alpha-induced signal transduction is not fully understood. In this study, we reconstituted RIP-deficient Jurkat T cells with a fusion protein composed of full-length MEKK3 and the death domain of RIP (MEKK3-DD). In these cells, MEKK3-DD substitutes for RIP and directly associates with TRADD in TNF receptor complexes following TNF-alpha stimulation. We found that TNF-alpha-induced NF-kappaB activation was fully restored by MEKK3-DD in these cells. In contrast, expression of a fusion protein composed of NEMO, a component of the IkappaB kinase complex, and the death domain of RIP (NEMO-DD) cannot restore TNF-alpha-induced NF-kappaB activation in RIP-deficient cells. These results indicate that the role of RIP is to specifically recruit MEKK3 to the TNF-alpha receptor complex, whereas the forced recruitment of NEMO to the TNF-alpha receptor complex is insufficient for TNF-alpha-induced NF-kappaB activation. Although MEKK2 has a high degree of homology with MEKK3, MEKK2-DD, unlike MEKK3-DD, also fails to restore TNF-alpha-induced NF-kappaB activation in RIP-deficient cells, indicating that RIP-dependent recruitment of MEKK3 plays a specific role in TNF-alpha signaling.
引用
收藏
页码:10757 / 10765
页数:9
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