通过防止SNX17介导的LDLR循环,促进LDLR降解
YangYang Guan1, Xiaomin Liu1, Zetian Yang2
1State Key Laboratory of Metabolism and Regulation in Complex Organisms, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, TaiKang Center for Life and Medical Sciences, Wuhan University, China. (Y.G., X.L., X.Z., M.L., M.D., Y.W.).
Circulation
|March 12, 2025
概括
通过阻断排序nexin 17 (SNX17) 的相互作用,防止LDL受体 (LDLR) 循环,从而导致LDLR降解. 在LDLR循环中出现的缺陷会导致对PCSK9抑制剂的耐药性.
科学领域:
- 分子生物学
- 细胞生物学
- 生物化学
背景情况:
- 低密度脂蛋白 (LDL) 主要通过LDL受体 (LDLR) 内化.
- 在内分体中,LDLR在释放LDL后通常会回收到细胞表面.
- 与LDLR结合的proprotein转化酶亚素/ kexin 9 (PCSK9) 会导致这两种蛋白质的溶酶性降解.
研究的目的:
- 阐明PCSK9调解LDLR降解的机制.
- 调查分类nexin 17 (SNX17) 在LDLR贩运中的作用.
- 了解PCSK9抑制剂耐药性的基础.
主要方法:
- 进行了体外和体内研究.
- 实验涉及表达LDLR与FH序列变异的Ldlr淘汰小鼠和HuH7细胞.
- 评估了对PCSK9和PCSK9抑制剂的反应.
主要成果:
- 酸性pH触发了LDLR的结构变化,促进了SNX17的相互作用和循环.
- PCSK9抑制了这种形状变化,防止了SNX17的相互作用,并阻断了LDLR的循环.
- 通过SNX17消除PCSK9介导的LDLR降解.
- 影响LDLR循环的FH序列变异会对PCSK9抑制剂产生耐药性.
结论:
- PCSK9通过防止SNX17介导的相互作用来抑制LDLR循环.
- 由于FH变化的LDLR循环缺陷的患者对PCSK9抑制剂具有耐药性.
- 对于这些耐药患者,需要采用其他治疗策略.
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