Original Article

Calcium channel blockade and anti-free-radical actions of panaxadiol saponins Rb1, Rb2, Rb3, Rc, and Rd

Authors: Guo-gan ZHONG, Cheng-wen SUN, Yun-yi LI, Hui QI, Chun-yan ZHAO, Yan JIANG, Xiao-ming WANG, Shi-jie YANG, Hong LI

Abstract

AIM: To identify the calcium channel blockade and anti-free-radical actions of panaxadiol saponins Rb1, Rb2, Rb3, Rc, and Rd.
METHODS: On ventricular myocardiocytes of Wistar rats, single channel activities of L, T, and B type Ca2+ channels were recorded with the cell-attached configuration of patch-clamp technic, and free radical contents were measured with electron spin resenance method.
RESULTS: Rb1, Rb2, Rb3, and Rc 200 mumol.L-1 shortened the open times, prolonged the close times, and reduced the openstate probabilities of calcium channels and 30 mumol.L-1 antagonized the increase of free radical content induced by xanthine 0.42 mmol.L-1-xanthine oxidase 5.3 nmol.L-1, but Rd in the same dose behaved none of the effects.
CONCLUSION: Rb1, Rb2, Rb3, and Rc had both the calcium channel blockade and anti-free-radical actions.
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