Inhibitory Effects of Glycyrrhetic Acid Derivatives on 11β- and 3α-Hydroxysteroid Dehydrogenases of Rat Liver
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概要
- 論文の詳細を見る
Glycyrrhetic acid (GA), an aglycone of glycyrrhizin (GL), is a potent inhibitor of 11β- and 3α-hydroxysteroid dehydrogenases. 11β-Hydroxysteroid dehydrogenase activity of rat liver microsomes was potently inhibited by GA, 3-deoxyglycyrrhetic acid (3-deoxy GA), 3-ketoglycyrrhetic acid (3-ketoGA), 3-epiglycyrrhetic acid (3-epiGA) and 11-deoxoglycyrrhetic acid (11-deoxoGA), with I_<50> values of 2-4×10^<-7>M. However, 18α-stereoisomers (I_<50>=3-7×10^<-6>M) of GA, 3-deoxyGA and 11-deoxoGA were one tenth less inhibitory on the enzyme activity than the corresponding 18β-isomers. On the other hand, 18α-stereoisomers of GA, 3-deoxyGA and 11-deoxoGA inhibited 3α-hydroxy-steroid dehydrogenase activity of rat liver cytosol more potently than the corresponding 18β-isomers. I_<50> values of 18α- and 18β-isomers were 2 and 7×10^<-6>M, respectively, in the case of GA, 8 and 20×10^<-6>M in 3-deoxyGA, 3 and 20×10^<-6>M in 11-deoxoGA. These results indicate that the 18β-conformation of oleanane is important for the inhibition of 11β-hydroxysteroid dehydrogenase but on the contrary the 18α-conformation is important for the inhibition of 3α-hydroxysteroid dehydrogenase.
- 社団法人日本薬学会の論文
- 1992-11-25
著者
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日合 奨
富山医科薬科大学和漢薬研究所
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小橋 恭一
Faculty Of Pharmaceutical Sciences Toyama Medical And Pharmaceutical University
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赤尾 光昭
富山医科薬科大学薬学部
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小橋 恭一
富山医科薬科大学
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赤尾 光昭
Faculty of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University
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寺沢 唯夫
Shionogi Research Laboratories, Shionogi & Co., Ltd.,
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日合 奨
Research Institute for Wakan-Yaku(Traditional Sino-Japanese Medicines), Toyama Medical and Pharmaceu
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小橋 恭一
富山医薬大薬学部
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寺沢 唯夫
Shionogi Research Laboratories Shionogi & Co. Ltd.
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