オバラ　ケイスケ   Obara Keisuke   小原　圭将    所属   東邦大学  薬学部 薬学科    職種   准教授
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Induction of endothelium-dependent relaxation in rat aorta via nitric oxide production caused by the aqueous extract of Astragalus membranaceus Bunge leaves
掲載誌名	正式名：Journal of Traditional Medicines 略　 称：J. Trad. Med. ISSNコード：18801447/18813747
出版社	Medical and Pharmaceutical Society for WAKAN-YAKU
巻・号・頁	30(1),pp.41-50
著者・共著者	Chino D＊†, Masuda H, Goto Y, Sato K†, Obara K†, Kitazawa N, Kanie K, Tanaka Y†, Watanabe Y.
発行年月	2013/03
概要	This study was designed to investigate the effects and associated mechanisms of the aqueous extract of Astragalus membranaceus Bunge (A. membranaceus) leaves on vascular contractions in rat thoracic aorta. In intact endothelium rings that had been pre-contracted with noradrenaline, the aqueous extract induced relaxation of the rings in a dose-dependent manner. Although this induction process was also effective following pre-incubation of the rings with indomethacin, pre-incubation with N ω-nitro-L-arginine methyl ester inhibited the induction. In an in vivo study, the intravenous injection of the aqueous extract led to an increase in serum nitric oxide levels in rat. To elucidate the effective component with the aqueous extract, the mixture was partitioned between water and n-butanol. The water-soluble fraction induced endothelium-dependent vasodilation, whereas the n-butanol-soluble fraction relaxed rat aortas pre-contracted with noradrenaline, both in the presence and absence of endothelium. These results suggest that endothelium-dependent nitric oxide could play a major role in vasodilation induced by the aqueous extract of the A. membranaceus leaves. Moreover, the active ingredients of the water extract could be included in the water-soluble fraction.
DOI	http://dx.doi.org/10.11339/jtm.30.41