期刊
MOLECULAR CELL
卷 35, 期 1, 页码 48-57出版社
CELL PRESS
DOI: 10.1016/j.molcel.2009.05.023
关键词
-
资金
- NIH [CA52599, DK074868, DK063491, DK39939, HL088093, HL065445, GM069338.]
Activation of toll-like receptors (TLRs) leads to derepression and subsequent activation of inflammatory response genes that play essential roles in innate and acquired immunity. Derepression requires signal-dependent turnover of the nuclear receptor corepressor NCoR from target promoters, but the mechanisms remain poorly understood. Here, we report that TLR4 uses NF kappa B to deliver IKK epsilon to target promoters that contain integrated circuits of kappa B and AP-1 sites, resulting in local phosphorylation of c-Jun and subsequent NCoR clearance. In contrast, TLR2 signaling leads to rapid activation of CaMKII and phosphorylation of the TBLR1 component of NCoR complexes, bypassing the requirement for c-Jun phosphorylation and enabling NCoR clearance from promoters lacking integrated kappa B elements. Intriguingly, the IKK epsilon-dependent clearance pathway is sensitive to transrepression by liver X receptors, while the CaMKII-dependent pathway is not. These findings reveal mechanisms for integration of TLR, calcium, and nuclear receptor signaling pathways that underlie pathogen-specific responses and disease-specific programs of inflammation.
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