期刊
EMBO JOURNAL
卷 34, 期 9, 页码 1244-1258出版社
WILEY
DOI: 10.15252/embj.201489819
关键词
atherosclerosis; inflammation; LXR; NCOA5; quantitative mass spectrometry
资金
- Canadian Institutes of Health Research Fellowship [MFE-112984]
- National Heart, Lung, and Blood Institute [HL098807]
- National Institute of Allergy and Infectious Diseases [R01 AI032972, R01 AI025032, U19 AI100627]
- National Institute of General Medical Sciences Center for Systems Biology [2P50 GM076547]
LXR-cofactor complexes activate the gene expression program responsible for cholesterol efflux in macrophages. Inflammation antagonizes this program, resulting in foam cell formation and atherosclerosis; however, the molecular mechanisms underlying this antagonism remain to be fully elucidated. We use promoter enrichment-quantitative mass spectrometry (PE-QMS) to characterize the composition of gene regulatory complexes assembled at the promoter of the lipid transporter Abca1 following downregulation of its expression. We identify a subset of proteins that show LXR ligand- and binding-dependent association with the Abca1 promoter and demonstrate they differentially control Abca1 expression. We determine that NCOA5 is linked to inflammatory Toll-like receptor (TLR) signaling and establish that NCOA5 functions as an LXR corepressor to attenuate Abca1 expression. Importantly, TLR3-LXR signal crosstalk promotes recruitment of NCOA5 to the Abca1 promoter together with loss of RNA polymerase II and reduced cholesterol efflux. Together, these data significantly expand our knowledge of regulatory inputs impinging on the Abca1 promoter and indicate a central role for NCOA5 in mediating crosstalk between pro-inflammatory and anti-inflammatory pathways that results in repression of macrophage cholesterol efflux.
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