通过SNAIL抑制ECM重塑导致血管疾病遗传风险的LRP1抑制
Lu Liu1, Joséphine Henry1, Yingwei Liu1
1Université Paris Cité, Inserm, PARCC, Paris, France.
Circulation research
|October 2, 2024
概括
在LRP1的遗传变异影响血管疾病的风险. SNAIL抑制LRP1的表达,影响光滑肌肉细胞功能和细胞外矩阵重塑,这可能解释其在多种血管疾病中的作用.
科学领域:
- 遗传学和分子生物学
- 心血管研究研究心血管研究
- 细胞生物学 细胞生物学
背景情况:
- 全基因组关联研究将LRP1 (低密度脂蛋白受体相关蛋白1) 基因位点的常见遗传变异与各种血管疾病的风险增加联系起来.
- 在血管疾病发病过程中LRP1的作用背后的精确生物机制在很大程度上是未知的.
研究的目的:
- 为了确定与血管疾病相关的LRP1位点内的因果遗传变异.
- 阐明这种变体影响LRP1表达和细胞功能的分子机制.
- 了解LRP1失调如何导致血管疾病的发展.
主要方法:
- 使用精细映射和贝叶斯同居分析来确定最可能的因果变异.
- 使用CRISPR-Cas9基因组编辑生成LRP1淘汰和增强剂删除的人类诱导多能干细胞系.
- 细胞分化为光滑肌肉细胞,并使用转录试验,敲击研究,RNA测序和质谱学研究分子机制.
主要成果:
- 鉴定出 rs11172113 变异为纤维肌力发育不良,偏头痛,脉冲压和自发冠状动脉剖析的最可能的因果变异.
- rs11172113-T等位基因与LRP1表达的增加有关,这种表达由光滑肌细胞中的增强器区域调节.
- 发现转录因子MECP2和SNAIL以异位基因特异的方式抑制LRP1的表达,SNAIL与疾病风险异位基因相互作用. 缺少LRP1会影响平滑肌肉细胞的增殖和迁移,改变细胞外基质组成,增强TGF-β信号传递.
结论:
- 作为内皮细胞到介质细胞的过渡调节剂,SNAIL以异位基因特定的方式抑制LRP1的表达.
- 在光滑肌细胞中减少LRP1表达,可能由SNAIL介导,并通过TGF-β信号增强,有助于细胞外矩阵重塑.
- 这种机制为LRP1位点在多种血管疾病中的类效应提供了潜在的解释.
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