@article{APS7992,
author = {Ning Zhong and Qi-Zhi Fang and Yi Zhang and Jia-Qing Qian and Zhao-Nian Zhou},
title = {Inhibitory effect of 1-(2, 6-dimethylphenoxy)-2-(3, 4-dimethoxyphenyl-ethylamino) propane hydrochloride on inward rectifier and delayed rectifier K+ currents in guinea pig ventricular myocytes},
journal = {Acta Pharmacologica Sinica},
volume = {21},
number = {4},
year = {2016},
keywords = {},
abstract = {\"AIM:
To study the effects of 1-(2,6-dimethylphenoxy)-2-(3,4-dimethoxyphenyl-ethylamino) propane hydrochloride (DDPH) on action potential (AP), inward rectifier K+ current (IK1), and delayed rectifier K+ current (IK) in isolated guinea pig ventricular myocytes.
METHODS:
Whole cell patch-clamp recording techniques.
RESULTS:
DDPH 0.1-100 mumol.L-1 decreased 50% duration of action potential (APD50) concentration-dependently. APD50 was shortened from (493 +/- 58) to (262 +/- 38) ms (n = 7 cells from 5 guinea pigs, P < 0.01) by DDPH 10 mumol.L-1. However, 90% duration of action potential (APD90) was increased by DDPH (> 1 mumol.L-1). At high concentration (> 10 mumol.L-1) DDPH decreased resting membrane potential (RP) and amplitude of action potential (APA). DDPH inhibited tail current of IK (IK.tail) concentration-dependently, 46% at 10 mumol.L-1 and 78% at 100 mumol.L-1. EC50 for DDPH inhibiting IK was 13.3 (11.6-16.7) mumol.L-1. DDPH also blocked IK1. DDPH at high concentration (> 10 mumol.L-1) shifted the reverse potential of IK1 positively. All the effects of DDPH were reversible after washout.
CONCLUSION:
DDPH blocked both IK1 and IK current in guinea pig ventricular myocytes.\"},
issn = {1745-7254}, url = {http://www.chinaphar.com/article/view/7992}
}