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急性蛋白质激酶Cβ抑制在心脏性缺氧/低氧化后保持冠状动脉内皮功能
Shawn Kant1, Hang Xing1, Yuhong Liu1
1Division of Cardiothoracic Surgery, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI.
JTCVS open
|October 9, 2023
概括
蛋白激酶Cβ (PKC) 的急性抑制可以保护冠状动脉内皮功能免受心脏的缺氧-重氧化损伤. 这表明PKCβ抑制可能会在心脏手术期间预防微血管功能障碍.
科学领域:
- 心血管生物学 心血管生物学
- 内皮细胞功能 内皮细胞功能
- 缺血-再输液损伤 缺血-再输液损伤
背景情况:
- 蛋白激酶C (PKC) 在心肌收缩性和心脏功能障碍中发挥作用.
- 在糖尿病中,PKC抑制显示出对微血管功能障碍的保护作用.
- SK通道功能障碍在心脏性缺氧复氧化 (CP-H/R) 期间导致内皮功能障碍.
研究的目的:
- 调查PKCβ的急性抑制是否可以预防CP-H/R诱导的冠状动脉内皮和SK通道功能障碍.
- 评估PKCβ抑制在预防CP-H/R相关的微血管损伤方面的治疗潜力.
主要方法:
- 孤立的小鼠冠状动脉小动脉接受了CP-H/R,其中一半已先用PKCβ抑制剂鲁巴克斯氨酸 (RBX) 进行预处理.
- 血管对腺二酸盐 (ADP) 和SK通道激活剂NS309的反应在CP-H/R后被测量.
- 在小鼠心脏内皮细胞中的SK特异性电流使用补丁技术进行了分析.
主要成果:
- CP-H/R显著损害了对ADP和NS309.9的冠状动脉放松反应.
- 在CP-H/R之后,RBX治疗显著改善了对ADP和NS309的放松反应的恢复.
- 在CP-H/R后的内皮细胞中,RBX治疗增强了NS309介导的电流和阿巴胺/TRAM34敏感电流.
结论:
- 急性抑制PKCβ显著保护小鼠冠状动脉内皮功能免受CP-H/R损伤.
- 准PKCβ可能是预防CP-H/R事件期间微血管功能障碍的新策略.
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