The Bcl6-SMRT/NCoR cistrome represses inflammation to attenuate atherosclerosis.
The Bcl6-SMRT/NCoR cistrome represses inflammation to attenuate atherosclerosis.
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DOI:
10.1016/j.cmet.2012.02.012
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发表时间:
2012-04-04
期刊:
影响因子:
29
通讯作者:
Evans RM
中科院分区:
文献类型:
--
作者:
Barish GD;Yu RT;Karunasiri MS;Becerra D;Kim J;Tseng TW;Tai LJ;Leblanc M;Diehl C;Cerchietti L;Miller YI;Witztum JL;Melnick AM;Dent AL;Tangirala RK;Evans RM
Chronic inflammation is a hallmark of atherosclerosis, but its transcriptional underpinnings are poorly understood. We show that the transcriptional repressor Bcl6 is an anti-inflammatory regulator whose loss in bone marrow of Ldlr−/− mice results in severe atherosclerosis and xanthomatous tendonitis, a virtually pathognomonic complication in patients with familial hypercholesterolemia. Disruption of the interaction between Bcl6 and SMRT or NCoR with a peptide inhibitor in vitro recapitulated atherogenic gene changes in mice transplanted with Bcl6-deficient bone marrow, pointing to these cofactors as key mediators of Bcl6 inflammatory suppression. Using ChIP-seq, we reveal the SMRT and NCoR co-repressor cistromes, each consisting of over 30,000 binding sites with a nearly 50% overlap. While the complete cistromes identify a diversity of signaling pathways, the Bcl6-bound sub-cistromes for each co-repressor are highly enriched for NF-κB-driven inflammatory and tissue remodeling genes. These results reveal that Bcl6-SMRT/NCoR complexes constrain immune responses and contribute to the prevention of atherosclerosis.
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