心脏通道的纳米组织取决于甲状腺激素状态
Amanda Charest1, Nicholas Nasta1, Sumaiyah Siddiqui1
1Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Old Westbury, New York, United States.
甲状腺激素 (TH) 缺乏通过损害T管完整性和离子通道组织来破坏心脏功能. 三-l-thyronine (T3) 治疗恢复了这些结构,优化了心脏细胞中的激发-收缩合.
科学领域:
- 心血管生理学心血管生理学
- 内分泌学 在内分泌学.
- 分子心脏病学分子心脏病学
背景情况:
- 甲状腺激素 (TH) 功能障碍在慢性疾病如心力衰竭中很常见,增加了不良事件的风险.
- THs在维持心脏功能和细胞完整性方面发挥着至关重要的作用.
- 了解THs对心脏刺激 - 收缩 (EC) 合的影响对于管理心脏病至关重要.
研究的目的:
- 研究TH缺乏和T3补充对心脏横管 (TT) 完整性的影响.
- 分析对Ca2+火花的影响以及EC合中关键离子通道 (CaV1.2,RyR2,Jph2) 的纳米组织.
- 阐明T3在调节心肌细胞内这些通道的空间布局中的作用.
主要方法:
- 在大鼠中诱导TH缺乏症,使用甲 (PTU) 治疗8周.
- 在一组接受PTU治疗的老鼠中,用triiodo-l-thyronine (T3) 治疗.
- 在隔离心肌细胞上进行共聚焦显微镜和随机光学重建显微镜 (STORM).
- 使用DBSCAN和近邻分析对TT对齐,Ca2+火花和CaV1.2,RyR2和Jph2的聚类/定位进行分析.
主要成果:
- 由于TH缺乏,导致TT misalignment,并增加了心肌细胞中的Ca2+火花.
- STORM检测出RyR2集群数量下降,以及TH缺乏细胞中RyR2的CaV1.2和Jph2同位变化.
- T3治疗使RyR2聚类正常化,并改善了CaV1.2和Jph2的局部化,这表明恢复了功能EC合.
- RyR2星团之间的近邻距离增加与TT混乱相关.
结论:
- 在心脏离子通道的纳米组织中,T3发挥着关键的调节作用.
- 保持TT结构和RyR2,CaV1.2和Jph2由T3的适当聚类/定位对于最佳的EC合至关重要.
- TH治疗可能有利于患有心脏病和低T3综合征的患者.
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