文章基本信息

标题：Trypanocidal Constituents in Plants 1. Evaluation of Some Mexican Plants for Their Trypanocidal Activity and Active Constituents in Guaco, Roots of Aristolochia taliscana
本地全文：下载
作者：Fumiko Abe ; Shinya Nagafuji ; Tatsuo Yamauchi 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：2002
卷号：25
期号：9
页码：1188-1191
DOI：10.1248/bpb.25.1188
出版社：The Pharmaceutical Society of Japan
摘要：Crude extracts of Mexican medicinal plants were screened for trypanocidal activity against Trypanosoma cruzi , which is the etiological agent for Chagas' disease, one of the most serious protozoan diseases in Latin America. There were 43 kinds of methanolic and other organic extracts from 39 plants which were examined by the preliminary screening test to see immobilization of epimastigotes of T. cruzi in vitro . Eighteen of them showed activity at the concentration of 2 mg/ml after incubation for 2 h, while 13 showed activity at the concentration of 1 mg/ml after incubation for 48 h. Among them, the MeOH extract of roots of Aristolochia taliscana (Aristolochiaceae), locally known as “Guaco, ” immobilized all the epimastigotes even at lower concentration of 0.5 mg/ml (48 h). In order to identify principal compounds for this activity, the MeOH extract of Guaco was subjected to bioassay-guided fractionation. From the active fractions, four neolignans, eupomatenoid-7 (1), licarin A (2), eupomatenoid-1 (5) and licarin B (6), and two lignans, austrobailignan-7 (3) and fragransin E₁ (4) were isolated. Compounds 1—4 immobilized all the epimastigotes at the minimum concentration of 25—75 μg/ml after incubation for 48 h, while compounds 5 and 6 were inactive. Corresponding concentration of gossypol, berberine chloride and harmine was 280 μg/ml, 300 μg/ml and >500 μg/ml, respectively.
关键词：trypanocidal activity;Trypanosoma cruzi;Aristolochia taliscana;Chagas' disease;neolignan;lignan