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KMID : 1123920150290060485
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Korean Journal of Oriental Physiology and Pathology
2015 Volume.29 No. 6 p.485 ~ p.491
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Relaxation Effects of Eucomiae Cortex in Isolated Rabbit Corpus Cavernosum Smooth Muscle
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Park Sun-Young
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Abstract
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This study was aimed to investigate the relaxation effects of Eucomiae Cortex (EC) extract in isolated rabbit corpus cavernosum smooth muscle and its mechanism. To evaluate the relaxation of EC extract in rabbit corpus cavernosum, EC extract was treated in corporal strips which were precontracted with phenylephrine(PE). To study its mechanism, Nω-nitro-L-arginine (L-NNA) was pretreated after infuse of EC extract and compared with non-treated. In calcium chloride (Ca2+) -free krebs solution, EC extract and Ca2+ 1 mM were infused by turns after Ca2+ 1 mM was treated into corporal strips contracted by PE. Cell ability, nitric oxide (NO) and epithelial nitric oxide synthase (eNOS) on human umbilical vein endothelial cell (HUVEC) were measured by MTT assay, Griess reagent system and histochemical, immunohistochemical methods. EC extract showed a significant relaxation effects on the corporal strips, this effects were inhibited by pretreatment of L-NNA. EC extract inhibited the increase of contraction by Ca2+ influx in Ca2+-free krebs solution, and eNOS positive reaction in corpus cavernosum, NO production in HUVEC increased by treatment of EC extract. These result suggest that the relaxation effects of EC extract in isolated corpus cavernosum smooth muscle are involved in increase of eNOS and NO production, blocking of extracellular Ca2+ influx.
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KEYWORD
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Eucomiae Cotex, corpus cavernosum, nitric oxide, eNOS
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