斯芬哥辛-1-酸盐通过线粒体的活性氧生产激活了室腔肌细胞中的ICl,swell
Frank J Raucci1, Adolfo G Mauro2, Edward J Lesnefsky3
1Department of Physiology and Biophysics, Virginia Commonwealth University, Richmond, VA, USA; Division of Pediatric Cardiology, Department of Pediatrics, Children's Hospital of Richmond at Virginia Commonwealth University Health System, Richmond, VA, USA.
Journal of molecular and cellular cardiology
|November 20, 2025
概括
斯芬哥辛-1-酸盐 (S1P) 激活心肌细胞中胀激活的化物电流 (ICl,swell). 这种激活是由线粒体产生的活性氧物种 (ROS) 介导的,而不是NADPH氧化酶2 (NOX2).
科学领域:
- 心脏病学 心脏病学
- 细胞生理学 细胞生理学
- 生物化学 生物化学
背景情况:
- 细菌的基酶 (SMase) 通过活性氧物种 (ROS) 在心肌细胞中激活化物流 (ICl,swell).
- 陶化物被转化为斯芬戈,然后被化为斯芬戈-1-酸盐 (S1P),它具有各种细胞质点.
研究的目的:
- 为了确定由SMase诱导的ROS生产的细胞来源.
- 为了确定负责激活ICl,swell的特定脂类物种.
- 为了阐明脂体对ICl,swell激活的机制.
主要方法:
- 在子心室肌细胞中的全细胞补丁电生理学.
- 药理上抑制了amidase和sphingosine kinase的作用.
- 使用流式细胞计量对ROS产生的评估.
- 药理学操纵线粒体ROS生产和NADPH氧化酶2 (NOX2) 的作用.
主要成果:
- 抑制amidase或sphingosine kinase可以防止SMase诱导的ICl,swell激活.
- 单独添加S1P可以激活ICl,swell.
- 由SMase诱导的ICl,swell激活取决于线粒体ROS的产生 (由罗抑制,由氧化物增强) 和独立于NOX2 (对阿波辛因或gp91ds-tat不敏感).
结论:
- 氨酸-1-酸盐 (S1P) 是触发心肌细胞中ICl,swell的脂.
- 线粒体ROS的产生通过SMase和S1P调解了ICl,swell的激活.
- 通过SMase和S1P激活ICl,swell的机制独立于NOX2.2.
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