Journal of Physiology & Pathology in Korean Medicine (동의생리병리학회지)

The Physiological Society of Korean Medicine and The Society of Pathology in Korean Medicine (대한동의생리학회·한의병리학회)
권호 표지

Endothelium-Dependent Vasorelaxation Effects of Rubus Coreanus extract on Rabbit Carotid Artery

복분자(覆盆子)의 내피세포의존성 혈관이완효과

  • Chin, Jun Ho (Department of Physiology, College of Korean Medicine, Semyung University) ;
  • Park, Sun Young (Department of Physiology, College of Korean Medicine, Semyung University)
  • 진준호 (세명대학교 한의과대학 생리학교실) ;
  • 박선영 (세명대학교 한의과대학 생리학교실)
  • Received : 2013.06.12
  • Accepted : 2013.07.05
  • Published : 2013.08.25
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Abstract

This study was investigated to evaluate the vasorelaxant effect of Rubus coreanus(RC) extract on contracted rabbit carotid artery and its mechanism. To study the effect of RC extract on contracted rabbit carotid arterial strips, arterial strips with intact or damaged endothelium were used for experiment using organ bath. The pre-contracted arterial strips with norepinephrine(NE) or potassium chloride(KCl) was treated with various concentrations of an extract of RC(0.01, 0.03, 0.1, 0.3 and 1.0 $mg/m{\ell}$). To determine the mechanisms of RC-induced vasorelaxant, RC extract was infused into contracted arterial rings which had been pretreated by indomethacin(IM), tetraethylammonium chloride(TEA), $N{\omega}$-nitro-L-arginine (L-NNA), methylene blue(MB). And calcium chloride(Ca) 1 mM was infused into precontracted arterial ring induced by NE or KCl after treatment of RC extract in $Ca^{2+}$-free krebs solution. Cytotoxic activity of RC extract on human umbilical vein endothelial cell(HUVEC) was measured by MTT assay, and nitric oxide(NO) prodution was measured by Griess reagent. RC extract revealed significant relaxation on NE-induced arterial contraction, but didn't relax on KCl-induced arterial contraction. RC extract also had an effective relaxation to the intact endothelium arterial ring, but not the damaged endothelium arterial ring. Treatment of IM, TEA, L-NNA, MB reduced the relaxation of RC extract. Pretreatment of RC extract inhibited the contraction by influx of extracellular $Ca^{2+}$ in contracted arterial ring induced by NE, but it didn't work the contraction by influx of extracellular $Ca^{2+}$ in contracted arterial ring induced by KCl in $Ca^{2+}$-free krebs solution. RC extract increased nitric oxide production on HUVEC. This study indicated that the relaxation effect of RC extract on contracted rabbit carotid artery is related with NO-cGMP pathway, EDHF, prostacyclin.

Keywords

References

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