Journal of Pharmacological Sciences
Online ISSN : 1347-8648
Print ISSN : 1347-8613
ISSN-L : 1347-8613
Short Communications
Effect of Cilnidipine on L- and T-type Calcium Currents in Guinea Pig Ventricle and Action Potential in Rabbit Sinoatrial Node
Kentaro TakedaReiko YamagishiHaruko MasumiyaHikaru TanakaKoki Shigenobu
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2004 Volume 95 Issue 3 Pages 398-401


Cilnidipine, a dihydropyridine Ca2+ channel antagonist, is known to have inhibitory effects on both L- and N-type Ca2+ currents. In the present study, we examined the effect of cilnidipine on myocardial L- and T-type Ca2+ currents and sinoatrial node action potential configuration. In voltage clamped guinea pig ventricular myocytes, cilnidipine concentration-dependently decreased L- and T-type Ca2+ currents. In rabbit sinoatrial node tissue, cilnidipine increased cycle length through reduction of phase 4 depolarization slope. In conclusion, cilnidipine has inhibitory effects on T-type Ca2+ current, which may contribute to its negative chronotropic potency.

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© The Japanese Pharmacological Society 2004
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