SREBP1 regulates Lgals3 activation in response to cholesterol loading.
SREBP1 regulates Lgals3 activation in response to cholesterol loading.
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DOI:
10.1016/j.omtn.2022.05.028
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发表时间:
2022-06-14
期刊:
影响因子:
--
通讯作者:
Guo, Lian-Wang
中科院分区:
文献类型:
--
作者:
Li, Jing;Shen, Hongtao;Owens, Gary K.;Guo, Lian-Wang
Aberrant smooth muscle cell (SMC) plasticity is etiological to vascular diseases. Cholesterol induces SMC phenotypic transition featuring high LGALS3 (galectin-3) expression. This proatherogenic process is poorly understood for its molecular underpinnings, in particular, the mechanistic role of sterol regulatory-element binding protein-1 (SREBP1), a master regulator of lipid metabolism. Herein we show that cholesterol loading stimulated SREBP1 expression in mouse, rat, and human SMCs. SREBP1 positively regulated LGALS3 expression (and vice versa), whereas Krüppel-like factor-15 (KLF15) acted as a negative regulator. Both bound to the Lgals3 promoter, yet at discrete sites, as revealed by chromatin immunoprecipitation-qPCR and electrophoretic mobility shift assays. SREBP1 and LGALS3 each abated KLF15 protein, and blocking the bromo/extraterminal domain-containing proteins (BETs) family of acetyl-histone readers abolished cholesterol-stimulated SREBP1/LGALS3 protein production. Furthermore, silencing bromodomain protein 2 (BRD2; but not other BETs) reduced SREBP1; endogenous BRD2 co-immunoprecipitated with SREBP1’s transcription-active domain, its own promoter DNA, and that of Lgals3. Thus, results identify a previously uncharacterized cholesterol-responsive dyad—SREBP1 and LGALS3, constituting a feedforward circuit that can be blocked by BETs inhibition. This study provides new insights into SMC phenotypic transition and potential interventional targets. Smooth muscle cells in a cholesterol-rich environment transition to a LGALS3-expressing multi-potential state, a key event in atherogenesis. We identify a cholesterol-responsive feedforward dyad of SREBP1 and LGALS3 positively regulating each other’s expression in vitro, which can be abolished by inhibiting the BET family of histone code readers.
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DOI:
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发表时间:
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期刊:
Medical science monitor : international medical journal of experimental and clinical research
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DOI:
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发表时间:
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期刊:
JACC. Basic to translational science
影响因子:
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