期刊
FEBS JOURNAL
卷 279, 期 2, 页码 211-222出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1742-4658.2011.08416.x
关键词
interleukin-1 (IL-1); interleukin-1 receptor-associated kinase (IRAK1); I?B-; post-transcriptional regulation; Toll-like receptor
资金
- KAKENHI [21117004, 21390088, 21200040]
- Takeda Science Foundation
- Naito Foundation
- Asahi Grass Foundation
- Suzuken Memorial Foundation
- Novartis Foundation for the Promotion of Science
- Japan Foundation for Applied Enzymology
- Grants-in-Aid for Scientific Research [21390088, 11J06972, 22117001, 22117002, 21117004, 21200040] Funding Source: KAKEN
I?B-?, an essential inflammatory regulator, is specifically induced by Toll-like receptor ligands or interleukin (IL)-1 beta by post-transcriptional activation mediated via a 165-nucleotide element in I B- mRNA. Here, we analyzed the Toll-like receptorIL-1 receptor signaling components involved in the post-transcriptional regulation of I?B-? with mutated estrogen receptor [ER(T2)] fusion proteins. Upon 4-hydroxytamoxifen treatment, the ER(T2) fusion proteins with IL-1 receptor-associated kinase (IRAK)1 and IRAK4 elicited specific activation of a reporter gene for the post-transcriptional regulation of I?B-?. The tumor necrosis factor receptor-associated factor (TRAF)6ER(T2) protein activated nuclear factor-?B, but not post-transcriptional regulation, indicating that activation of IRAK1/4, but not of TRAF6, is sufficient to activate the 165-nucleotide element-mediated post-transcriptional mechanism. Interestingly, the post-transcriptional mechanism was not activated in TRAF6-deficient cells, indicating an essential role for TRAF6. Thus, the signaling pathway leading to nuclear factor-?B activation and the post-transcriptional activation bifurcates at IRAK1, suggesting a new pathway activated by IRAK1.
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