期刊
PHARMACOLOGICAL RESEARCH
卷 62, 期 5, 页码 384-390出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phrs.2010.07.008
关键词
Raloxifene; Delayed rectifier potassium currents; Voltage-gated sodium current; QTc interval
资金
- Sun Chieh Yeh Heart Foundation of Hong Kong
Raloxifene is widely used in the treatment of postmenopausal osteoporosis and also has been shown to be cardioprotective. The effect of raloxifene on cardiac ion channels is not fully understood. The present study investigated whether raloxifene could affect the cloned hERG channel (I-hERG) and recombinant human cardiac KCNQ1/KCNE1 channel (I-Ks) stably expressed in HEK 293 cells using a patch-clamp technique. Raloxifene blocked I-hERG with an IC50 of 1.1 mu M and decreased I-Ks (IC50: 4.8 mu M) without affecting activation kinetics. In addition, raloxifene significantly decreased I-Na (IC50: 2.8 mu M) in guinea pig ventricular myocytes. However, this drug (1 mu M) did not increase QRS and QTc interval in isolated guinea pig hearts. These results demonstrate that raloxifene, despite its inhibitory action on delayed rectifier potassium currents, does not prolong ECG QTc interval, suggesting that raloxifene is likely a safe selective estrogen receptor modulator with less cardiac toxicity. (C) 2010 Elsevier Ltd. All rights reserved.
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