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:
MOLECULAR THERAPY NUCLEIC ACIDS
影响因子:
--
通讯作者:
Guo, Lian-Wang
Guo, Lian-Wang
中科院分区:
其他
文献类型:
--
作者:
Li, Jing;Shen, Hongtao;Owens, Gary K.;Guo, Lian-Wang

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平滑肌细胞可塑性异常是血管疾病的病因。胆固醇诱导SMC表型转变,高LGALS3(半乳糖凝集素-3)表达。这种致动脉粥样硬化过程的分子基础尚不清楚,特别是固醇调节元件结合蛋白-1 (SREBP1)的机制作用,它是脂质代谢的主要调节因子。本研究表明,胆固醇负荷刺激小鼠、大鼠和人类SMCs中SREBP1的表达。SREBP1正调控LGALS3的表达(反之亦然),而kr<s:1> ppel样因子-15 (KLF15)作为负调控因子。两者都与Lgals3启动子结合,但在离散的位点,如染色质免疫沉淀- qpcr和电泳迁移转移试验所显示的那样。SREBP1和LGALS3均能抑制KLF15蛋白,阻断乙酰组蛋白读取器的溴/外结构域蛋白(BETs)家族可抑制胆固醇刺激的SREBP1/LGALS3蛋白产生。此外,沉默溴结构域蛋白2 (BRD2,而不是其他BETs)降低了SREBP1;内源性BRD2与SREBP1的转录活性结构域、其自身的启动子DNA以及Lgals3共同免疫沉淀。因此,研究结果确定了一个以前未被表征的胆固醇反应双体- srebp1和LGALS3,它们构成了一个可以被BETs抑制阻断的前馈电路。这项研究为SMC表型转变和潜在的干预靶点提供了新的见解。平滑肌细胞在富含胆固醇的环境中转变为表达lgals3的多电位状态,这是动脉粥样硬化发生的关键事件。我们在体外鉴定出SREBP1和LGALS3相互正向调节表达的胆固醇响应前馈二联体,可以通过抑制组蛋白编码读取器的BET家族来消除。
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.
大鼠主动脉血管平滑肌细胞的原发性培养:一种新方法。
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