Abstract
The Casearia sylvestris SW (Flacourtiaceae) is utilized in folk medicine (Brazil and all Latin American) to treat several pathologic processes as inflammation, cancer, microbial infection and snake bites. Studies showed that C. sylvestris aqueous extract can inhibit many toxic effects caused by snake venoms (or caused by phospholipase A(2) isolated) from different species, mainly of Bothrops genus. Inhibition of enzymatic and myotoxic activities, decrease of edema formation and increase of the survival rate of rats injected with lethal doses of bothropic venoms are some toxic effects inhibited by C. sylvestris. In this study, four ellagic acid derivatives from aqueous extracts of C. sylvestris were isolated, characterized, and tested against effects from both total venom and PLA(2) (Asp 49 BthTX-II) from the venom of Bothrops jararacussu. The isolated compounds were as follows: ellagic acid (A), 3'-O-methyl ellagic acid (B), 3,3'-di-O-methyl ellagic acid (C), 3-O-methyl-3',4'-methylenedioxy ellagic acid (D). The inhibition constant values (Ki) for enzymatic activity, as well the IC(50) values found in the edematogenic and myotoxic activities, indicate that the ellagic acid is the best inhibitor of these activities, while compou...Continue Reading
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