Cardiac Glycosides from Antiaris toxicaria with Potent Cardiotonic Activity

详细信息    查看全文

• 作者：Li-Shian Shi ; Yu-Ren Liao ; Ming-Jai Su ; An-Sheng Lee ; Ping-Chung Kuo ; Amooru G. Damu ; Sheng-Chu Kuo ; Han-Dong Sun ; Kuo-Hsiung Lee ; Tian-Shung Wu
• 刊名：Journal of Natural Products
• 出版年：2010
• 出版时间：July 23, 2010
• 年：2010
• 卷：73
• 期：7
• 页码：1214-1222
• 全文大小：167K
• 年卷期：v.73,no.7(July 23, 2010)
• ISSN：1520-6025

文摘

An ethanolic extract of Antiaris toxicaria trunk bark showed potent in vitro cardiotonic effect on isolated guinea pig atria. Bioassay-guided fractionation of the extract led to identification of nine new cardiac glycosides (1−9, named antiarosides A−I), antiarotoxinin A (10), and 18 known compounds. Their structures were established using MS and NMR spectroscopic studies, including homonuclear and heteronuclear correlation experiments. The ability of these cardiotonic compounds to produce positive inotropic action and their safety indexes were examined in comparison with those of ouabain, a classical inhibitor of Na⁺/K⁺-ATPase. Malayoside (23) was nearly equipotent and had a similar safety index to ouabain in guinea pig atria. However, the maximal positive inotropic effect and safety index of 23 in papillary muscle were better than those of ouabain. An electrophysiological recording showed that 23 inhibited the sodium pump current in a concentration-dependent manner.