SRF SUMOylation调节了光滑肌肉的表型切换和血管重塑
Yue Xu1,2, Haifeng Zhang1, Yuxin Chen3
1Interdepartmental Program in Vascular Biology and Therapeutics, Department of Pathology, Yale University School of Medicine, New Haven, CT, USA.
Nature communications
|August 12, 2024
概括
血管光滑肌细胞 (VSMC) 中的Senp1缺乏会增加SUMOylatedSRF,促进心血管疾病. 准SRF-ELK复合体可能为治疗心血管疾病 (CVD) 提供新的治疗策略.
科学领域:
- 分子生物学分子生物学
- 心血管研究研究心血管研究
- 细胞信号传输 细胞信号传输
背景情况:
- 血清反应因子 (SRF) 调节血管光滑肌细胞 (VSMC) 现型,在心血管疾病 (CVD) 发病过程中至关重要.
- 在心血管疾病的背景下,后翻译SUMOylation在调节SRF活动中的作用仍然在很大程度上未被探索.
研究的目的:
- 调查 Senp1 缺乏对SRF SUMOylation的影响及其对VSMC表型和血管重塑的下游影响.
- 阐明SRF SUMOylation在心血管疾病中影响SRF-肌卡丁和SRF-ELK1复合物的分子机制.
主要方法:
- 利用VSMC中Senp1缺陷的小鼠模型研究血管改造和新极限形成.
- 分析了SRF在lysine 143中的SUMOylation,SRF局部化 (溶酶体和核),以及SRF复合体的形成 (SRF-myocardin与SRF-ELK1).
- 从心血管疾病患者的冠状动脉中检查了SUMOylated SRF和-ELK1水平的VSMCs.
- 在小鼠模型中评估ELK抑制剂AZD6244的治疗潜力.
主要成果:
- 在VSMC中Senp1缺乏导致SRF SUMOylation和SRF-ELK复合物的增加,增加了血管重塑和新极限形成.
- 从机理上讲,增加SRF在K143的SUMOylation减少了 lysosomal定位,增加了核积累,并将SRF复合物从肌肉转移到ELK1.
- 在来自人类心血管疾病患者冠状动脉的VSMC中观察到升高的SUMOylatedSRF和-ELK1.
- 用AZD6244抑制ELK减弱了SRF-肌肉激素到SRF-ELK复合体的转移,减少了VSMC合成表型和新极限形成在Senp1缺乏的小鼠.
结论:
- 特别是在Senp1缺乏的情况下,SRF SUMOylation促进了合成VSMC表型,并有助于心血管疾病的进展.
- 在这个过程中,SRF-ELK1复合体是关键的调解者,其抑制显示出治疗前景.
- 针对SRF复合体,特别是SRF-ELK相互作用,为治疗心血管疾病提供了潜在的治疗途径.
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