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淫羊藿의 토끼 음경해면체 평활근 이완효과

Relaxation Effects of Epimedium Koreanum Nakai in Isolated Rabbit Corpus Cavernosum Smooth Muscle

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초록

This study aimed to investigate the relaxation effects and its underlying mechanisms of Epimedium koreanum Nakai(EK) in phenylephrine(PE) treated isolated rabbit corpus cavernosum smooth muscle. The dose-dependent relaxation responses of phenylephrine(PE, 1×10-6 M)-precontracted strips to EK at 0.01-3.0 ㎎/㎖ were measured and also observed after endothelial denudation using organ bath. To analyze the underlying mechanisms of EK-induced relaxation, Nω-nitro-L-arginine(L-NNA), methylene blue(MB), tetraethylammonium chloride(TEA), indomethacin(IM) were pretreated before EK extract infused into precontracted strips induced by PE. To investigate cytotoxic activity and nitric oxide(NO) concentration of EK extract on EA.hy926 cells, mitochondrial dehydrogenase activity(MTT) assay and nitric oxide detection kit were used. The cavernous strips were significantly relaxed by EK extract at 0.3 ㎎/㎖, 1.0 ㎎/㎖, 3.0 ㎎/㎖ and the relaxation responses of PE-precontracted strips denuded endothelium also inhibited in comparison with intact endothelium. The pretreatment of L-NNA, MB, TEA reduced EK extract-induced endothelium-dependent relaxation, but the pretreatment of IM didn't affect EK extract-induced endothelium-dependent relaxation. When EK extract was applicated on EA.hy926 cells, the NO concentration was increased. Our findings have shown that EK extract exerts a relaxing effect on corpus cavernosum in part by suppressing influx of extracellular Ca2+ through activating the NO-cGMP system.

Abstract

This study aimed to investigate the relaxation effects and its underlying mechanisms of Epimedium koreanum Nakai(EK) in phenylephrine(PE) treated isolated rabbit corpus cavernosum smooth muscle. The dose-dependent relaxation responses of phenylephrine(PE, 1×10-6 M)-precontracted strips to EK at 0.01-3.0 ㎎/㎖ were measured and also observed after endothelial denudation using organ bath. To analyze the underlying mechanisms of EK-induced relaxation, Nω-nitro-L-arginine(L-NNA), methylene blue(MB), tetraethylammonium chloride(TEA), indomethacin(IM) were pretreated before EK extract infused into precontracted strips induced by PE. To investigate cytotoxic activity and nitric oxide(NO) concentration of EK extract on EA.hy926 cells, mitochondrial dehydrogenase activity(MTT) assay and nitric oxide detection kit were used. The cavernous strips were significantly relaxed by EK extract at 0.3 ㎎/㎖, 1.0 ㎎/㎖, 3.0 ㎎/㎖ and the relaxation responses of PE-precontracted strips denuded endothelium also inhibited in comparison with intact endothelium. The pretreatment of L-NNA, MB, TEA reduced EK extract-induced endothelium-dependent relaxation, but the pretreatment of IM didn't affect EK extract-induced endothelium-dependent relaxation. When EK extract was applicated on EA.hy926 cells, the NO concentration was increased. Our findings have shown that EK extract exerts a relaxing effect on corpus cavernosum in part by suppressing influx of extracellular Ca2+ through activating the NO-cGMP system.

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