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pubmed-article:18192087pubmed:abstractTextThe inhibitory potency of ursolic acid extracted from Ilex paraguariensis, a plant used in South American population for a tea preparation known as maté, and its derivatives to inhibit aromatase activity was assessed and compared to a phytoestrogen apigenin and a steroidal aromatase inhibitor 4-hyroxyandrostenedione (4-OHA). Among all compounds tested only ursolic acid 1 showed an efficient and dose-dependent aromatase inhibition with IC50 value of 32 microM as did apigenin (IC50=10 microM), whereas IC50 value of 4-OHA was 0.8 microM. Our results show that the incorporation of a metallocene moiety into the ursolic acid derivatives decreases the aromatase inhibition. Moreover, comparison of the structure/inhibitory potency relationship of compounds indicates that the presence of cycle A and the configuration of C3-OH and C17-COOH seems to be more favourable to recognize the active site of aromatase and to block its activity.lld:pubmed
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pubmed-article:18192087pubmed:articleTitleEvaluation of ursolic acid isolated from Ilex paraguariensis and derivatives on aromatase inhibition.lld:pubmed
pubmed-article:18192087pubmed:affiliationFaculdade de Farmácia, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Ipiranga 2752, Porto Alegre 90610-000, RS, Brazil.lld:pubmed
pubmed-article:18192087pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:18192087pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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