Análise comparativa da composição proteica e dos efeitos hemolítico, oxidante, antioxidante e coagulante das peçonhas brutas de machos e fêmeas da serpente Bothrops leucurus

• Autor(a) principal: Silva, Diana Pontes da
• Data de Publicação: 2017
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFPB
• Texto Completo: https://repositorio.ufpb.br/jspui/handle/tede/9389
• topic: Variação Sexual; Lise Eritrocitária; Hemaglutinação; Estresse Oxidativo; Coagulação Plasmática; Sexual Variation; Erythrocyte Lysis; Hemagglutination; Oxidative stress; Plasma Coagulation; CIENCIAS BIOLOGICAS::BIOLOGIA GERAL

Snake venoms are complex mixtures of components that act upon the disturbance of various physiological mechanisms. The composition and biological activities of the venom may vary in snakes according to age, sex and geographic region. The present work aimed to evaluate the protein composition and biological activities triggered, in vitro, by male and female venoms of the Bothrops leucurus snake. The protein profile was obtained by high performance liquid chromatography (HPLC) and one-dimensional electrophoresis under denaturing conditions (SDS-PAGE). The biological effects evaluated were oxidative stress, antioxidant, coagulant and hemolytic (direct and indirect) activities. A chromatographic and electrophoretic analysis presented similarities between the protein profiles of males and females venoms. The evaluated venoms did not present hemolytic effect (direct or indirect) on erythrocytes. Significant erythrocyte haemagglutination was observed, it was caused by all the measurements of the venoms evaluated. B. leucurus venoms did not present oxidative effect on hemoglobin. In the presence of both venoms studied, were observed a reduction of the oxidative effect on hemoglobin caused by phenylhydrazine; suggesting the presence of antioxidant components in the composition of the venoms. The evaluation of coagulating effect of B. leucurus venoms were performed on citrated human plasma and clotting times were shorter in the presence of female venom and, both venoms presented clot formation time inversely proportional to the quantities evaluated. However, both protein profile and hemolytic (direct and indirect), oxidant and antioxidant effects observed in B. leucurus venom were similar for male and female venoms. Otherwise, the sexual variation linked to the coagulant effect may justify the differences in type and/or intensity of symptoms observed in ophidian accidents.