ISSN 0371-0874, CN 31-1352/Q

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辣椒素对家兔房室结细胞自发活动的电生理效应

李茜, 武宇明, 何瑞荣

河北医科大学基础医学研究所生理室.河北,石家庄 050017

摘要

研究辣椒素对家兔房室结细胞自发活动的电生理效应及其作用机制。应用经典玻璃微电极记录方法,观察到辣椒素(1-30#mu#mol/L)剂量依赖性地抑制房室结起搏细胞的动作电位幅度,零相最大上升速度(V_(max)),舒张期除极速度和起搏放电频率,而且延长复极化90%时间(APD_(90))。应用L型钙通道开放剂Bay K8644(0.5 #mu#mol/L),以及提高灌流液中钙离子浓度(5 mmol/L),均可抑制辣椒素对起搏细胞的电生理效应。辣椒素受体阻断钌红(10#mu#mol/L)对辣椒素(10#mu#mol/L)的上述电生理效应并无影响。上述结果表明,辣椒素能抑制家兔房室结的自发活动,此效应可能与其抑制钙离子内流有关,但并非由辣椒素受体介导。

Electrophysiological effects of capsaicin on spontaneous activity of rabbit atrioventricular node cells

Li Qian, Wu Yuming, He Ruirong

Department of Physiology,Institute of Basic Medicine,Hebei Medical University.Shijiazhuang 050017,Hebei

Abstract

To study the electrophysiological effects of capsaicin on spontaneous activity of rabbit atrioventricular (AV) node cells, parameters of action potential in AV node were recorded using intracellular microelectrode technique.

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引用本文:

李茜, 武宇明, 何瑞荣. 辣椒素对家兔房室结细胞自发活动的电生理效应[J]. 生理学报 2004; 56 (2): .

Li Qian, Wu Yuming, He Ruirong. Electrophysiological effects of capsaicin on spontaneous activity of rabbit atrioventricular node cells. Acta Physiol Sin 2004; 56 (2): (in Chinese with English abstract).