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在老鼠心脏肌细胞中循环诺辛单酸分离
Liliana R V Castro1, Ignacio Verde, Dermot M F Cooper
1INSERM, U769, Châtenay-Malabry, France.
Circulation
|May 3, 2006
概括
在老鼠心肌细胞中循环氨酸单酸 (cGMP) 的分区在尿酸和氧化 (NO) 捐赠者之间有所不同. 固酶 (PDE) 亚型差异调节这些cGMP池,影响心脏功能.
科学领域:
- 心血管生理学心血管生理学
- 细胞信号传递 细胞信号传递
- 分子药理学分子药理学
背景情况:
- 循环氨酸单酸盐 (cGMP) 中介于氧化 (NO) 和尿酸的心血管作用.
- 尿素和NO捐赠者对心脏和血管光滑肌有明显的影响.
- 研究了细胞内cGMP分区和固酶 (PDE) 的作用.
研究的目的:
- 为了研究大鼠心肌细胞中cGMP的细胞内分离.
- 评估特定固酶 (PDE) 亚型在调节cGMP池中的作用.
- 了解尿素和NO捐赠者的差异信号传递.
主要方法:
- 在成年大鼠心肌细胞中使用cGMP-gated (CNG) 通道监测子体cGMP信号.
- 记录cGMP导入电流 (ICNG) 作为对尿素和NO捐赠者的反应.
- 评估非选择性,PDE2和PDE5抑制剂对ICNG的影响.
主要成果:
- 前庭和大脑尿性激活了ICNG,而NO捐赠者的影响很小.
- 非选择性和PDE2抑制剂强化了ICNG.
- 抑制PDE5 (西尔德纳菲尔) 增加了由NO捐赠者激活的ICNG,但不是尿素.
结论:
- 颗粒物cGMP池是膜可访问的;可溶性池不是.
- PDE5 调节可溶性cGMP,而 PDE2 完全控制颗粒性cGMP.
- 不同的cGMP局部化有助于显著的 natriuretic和NO供体对心脏功能的影响.
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