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过氧化是一种内源性内皮细胞衍生的超极化因子,在体内冠状动脉自调节中起着重要作用.

Toyotaka Yada1, Hiroaki Shimokawa, Osamu Hiramatsu

  • 1Department of Medical Engineering, Kawasaki Medical School, Kurashiki, Okayama, Japan. yada@me.kawasaki-m.ac.jp

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内皮质衍生过氧化 (H2O2) 在体内作为内皮质衍生超极化因子 (EDHF). 这一发现对于理解冠状动脉自我调节至关重要,强调其与氧化 (NO) 和腺的合作作用.

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科学领域:

  • 心血管生理学心血管生理学
  • 内皮细胞功能 内皮细胞功能
  • 血管生物学 血管生物学

背景情况:

  • 新兴的体外证据表明,过氧化 (H2O2) 作为内皮衍生的高极化因子 (EDHF) 起作用.
  • 在体内,H2O2作为EDHF的生理作用还没有完全阐明.
  • 研究H2O2在冠状动脉自我调节中的作用对于理解心脏血流控制至关重要.

研究的目的:

  • 为了确定内皮质衍生的H2O2是否在体内充当EDHF.
  • 评估H2O2在调节冠状动脉血流中的重要性.
  • 探索H2O2,氧化 (NO) 和冠状动脉自我调节中的腺之间的相互作用.

主要方法:

  • 利用静脉内显微镜来评估狗冠状动脉和动脉中的血管扩展反应.
  • 使用N(G) - 单甲基-L-氨酸 (L-NMMA) 抑制氧化 (NO) 合成.
  • 服用催化酶 (H2O2清除剂) 和四甲基 (TEA,K(Ca) 通道阻断剂) 来调查H2O2和K(Ca) 通道的参与.
  • 使用8-硫甲 (腺受体对抗剂) 来探测腺的作用.

主要成果:

  • 用L-NMMA抑制NO合成减弱了血管扩张反应,特别是在小冠状动脉中.
  • 联合抑制NO和H2O2 (使用L-NMMA和触酶) 或阻断K (使用TEA) 道 (使用TEA) 显著降低了动脉和动脉小血管的血管扩张.
  • 在L-NMMA和catalase/TEA后的残留血管扩张因腺素受体阻断而进一步减小,这表明腺素的作用.

结论:

  • 内皮衍生的H2O2在体内作为内源性EDHF起作用.
  • H2O2在冠状动脉自我调节中起着重要作用.
  • 冠状动脉自调节涉及H2O2,NO和腺之间的合作机制.