Chinese Pharmacological Bulletin 2001;17(2):174-177
Characteristics of the delayed rectifier K+ current in guinea pig hypertrophied ventricular myocytes induced by thyroxine
Guangqin ZHANG ; Xuemei HAO ; Yuping MA ; Peiai ZHOU ; Caihong WU ; Dezai DAI
Country
China
Language
Chinese
Abstract
AIM To study the characteristic of th e rapidly activating component (Ikr) and the slowly activating compone nt (Iks) of the delayed rectifier K+ current in guinea pig hypertrop hi ed ventricular myocytes induced by thyroxine. METHOD The whole c ell patch clamp techniques were used. RESULTS In hypertrophied ve ntricular myocytes, the magnitude of IKr and IKs were great ly augmented with more positive depolarizations, and the degree of increase of IKr tail and IKs were greater than that of IKr an d IKs tail, respectively. By measuring the amplitude of tail currents which reflected the degree of activation, the activation curve of IKs was shifted toward more negative potential, but that of IKr was marked ly unaffected in hypertrophied myocytes. CONCLUSION Hypertrophied ventricular myocytes induced by thyroxine obviously increased IKr and IKs.
备案号: 11010502037788, 京ICP备10218182号-8)