通过KCNJ5突变自主释放上腺素驱动家族胸前动脉动脉瘤和解剖
Yanyu Duan1,2,3, Chenglong Wu1, Zhenghong Lai3
1Engineering Research Center of Intelligent Acoustic Signals of Jiangxi Province, Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases, Ministry of Education (Y.D., C.W., N.H., Z. Liu), Gannan Medical University, Ganzhou, China.
一种新型的KCNJ5突变通过增加上腺素分泌诱导缩性高血压,导致家族胸前大动脉动脉瘤和解剖 (TAAD),将遗传因素与TAAD发展联系起来.
科学领域:
- 遗传学 遗传学 是一个
- 心血管医学 心血管医学
- 分子生物学分子生物学
背景情况:
- 亲属胸大动脉动脉瘤和剖析 (TAAD) 与影响大动脉完整性的遗传变异有关.
- 高血压是TAAD的一个已知的危险因素,但潜在的遗传机制在很大程度上仍然未知.
研究的目的:
- 为了识别导致家族性TAAD与同时发生的高血压的遗传突变.
- 用小鼠模型阐明一种特定突变导致高血压诱导的TAAD的机制.
主要方法:
- 为了确定候选突变,分析了一家具有自体主导的TAAD和高血压的家庭.
- 为了研究已识别的突变对TAAD和高血压的影响,生成了一个集群定期间隔的短平行体重复 (CRISPR) -Cas9敲入小鼠模型.
主要成果:
- 鉴定了KCNJ5 p.R242Q突变,并发现该突变在家族中与TAAD共同分离.
- 异卵性突变小鼠表现出胸前大动脉扩张,发病率与等位基因剂量和高血压相关.
- 这种突变诱导了终身孤立的缩性高血压,这是由于上腺髓自主分泌上腺素,KCNJ5在中高度表达.
- 在突变小鼠中,用普罗普拉诺洛尔治疗降低了高血压,并减轻了TAAD.
结论:
- 在G蛋白合域中KCNJ5的功能障碍可能会通过诱导通过上腺素分泌的隔离性静脉高血压和破坏胸前大动脉平衡来引起家族性TAAD.
- 这项研究确立了系统性高血压和TAAD发展之间的直接遗传联系.
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