Abstract:
RATIONALE:Atherosclerosis proceeds through a multistep reaction that begins with endothelial injury caused by a host of stress signals, among which oxidized low-density lipoprotein (oxLDL) plays a critical role. OxLDL disrupts normal functionality of the endothelium by upregulating adhesion molecules (eg, ICAM-1) and concomitantly downregulating endothelial nitric oxide synthase (eNOS) expression. The transcriptional modulator that mediates the cellular response to oxLDL remains largely obscure. OBJECTIVE:Our goal was to determine whether myocardin-related transcription factor (MRTF)-A, a key protein involved in the transcriptional regulation of smooth muscle cell phenotype, is responsible for the endothelial injury by oxLDL, and, if so, how MRTF-A promotes the proatherogenic agenda initiated by oxLDL. METHODS AND RESULTS:OxLDL stimulated the expression of MRTF-A in endothelial cells as evidenced by Western blotting and immunofluorescence. Overexpression of MRTF-A synergistically enhanced the induction of ICAM-1 and suppression of eNOS by oxLDL. In contrast, disruption of MRTF-A, either by small interfering RNA or dominant negative mutation, abrogated the pathogenic program triggered by oxLDL. Finally, chromatin immunoprecipitation assays indicate that oxLDL preferentially augmented MRTF-A binding to ICAM-1 and eNOS promoters and that MRTF-A drove differential epigenetic alterations taking place on these promoters in response to oxLDL. CONCLUSIONS:Therefore, our data provide the first demonstration that MRTF-A is critically linked to pivotal pathophysiological events in the vascular endothelium.
journal_name
Circ Resjournal_title
Circulation researchauthors
Fang F,Yang Y,Yuan Z,Gao Y,Zhou J,Chen Q,Xu Ydoi
10.1161/CIRCRESAHA.111.240655subject
Has Abstractpub_date
2011-04-01 00:00:00pages
797-807issue
7eissn
0009-7330issn
1524-4571pii
CIRCRESAHA.111.240655journal_volume
108pub_type
杂志文章abstract::Structural remodeling of the ventricular wall is a key determinant of clinical outcome in heart disease. Such remodeling involves the production and destruction of extracellular matrix proteins, cell proliferation and migration, and apoptotic and necrotic cell death. Cardiac fibroblasts are crucially involved in these...
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doi:10.1161/01.res.53.5.584
更新日期:1983-11-01 00:00:00
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doi:10.1161/01.res.72.5.1082
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更新日期:1994-05-01 00:00:00
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pub_type: 杂志文章
doi:10.1161/01.res.75.2.268
更新日期:1994-08-01 00:00:00
abstract::During ischemia and reperfusion, with an increase in intracellular Na+ and a depolarized membrane potential, Ca2+ may enter the myocyte in exchange for intracellular Na+ via reverse-mode Na+-Ca2+ exchange (NCX). To test the role of Ca2+ entry via NCX during ischemia and reperfusion, we studied mice with cardiac-specif...
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journal_title:Circulation research
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更新日期:2012-03-16 00:00:00
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更新日期:2016-04-15 00:00:00
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pub_type: 杂志文章
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更新日期:2002-11-15 00:00:00
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pub_type: 杂志文章,评审
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