RESUMO
Trypanosoma cruzi strains from distinct geographic areas show differences in drug resistance and association between parasites genetic and treatment response has been observed. Considering that benznidazole (BZ) can reduce the parasite burden and tissues damage, even in not cured animals and individuals, the goal is to assess the drug response to BZ of T. cruzi II strains isolated from children of the Jequitinhonha Valley, state of Minas Gerais, Brazil, before treatment. Mice infected and treated with BZ in both phases of infection were compared with the untreated and evaluated by fresh blood examination, haemoculture, polymerase chain reaction, conventional (ELISA) and non-conventional (FC-ALTA) serologies. In mice treated in the acute phase, a significant decrease in parasitaemia was observed for all strains. Positive parasitological and/or serological tests in animals treated during the acute and chronic (95.1-100%) phases showed that most of the strains were BZ resistant. However, beneficial effect was demonstrated because significant reduction (p < 0.05%) and/or suppression of parasitaemia was observed in mice infected with all strains (acute phase), associated to reduction/elimination of inflammation and fibrosis for two/eight strains. BZ offered some benefit, even in not cured animals, what suggest that BZ use may be recommended at least for recent chronic infection of the studied region.
Assuntos
Humanos , Descoberta de Drogas , Resíduos Industriais/análise , Nootrópicos/isolamento & purificação , Extratos Vegetais/química , Brotos de Planta/química , Estilbenos/isolamento & purificação , Vitis/química , Agricultura/economia , Peptídeos beta-Amiloides/antagonistas & inibidores , Peptídeos beta-Amiloides/metabolismo , Benzofuranos/análise , Benzofuranos/química , Benzofuranos/economia , Benzofuranos/isolamento & purificação , Cromatografia Líquida de Alta Pressão , França , Resíduos Industriais/economia , Estrutura Molecular , Fármacos Neuroprotetores/química , Fármacos Neuroprotetores/economia , Fármacos Neuroprotetores/isolamento & purificação , Fármacos Neuroprotetores/farmacologia , Nootrópicos/química , Nootrópicos/economia , Nootrópicos/farmacologia , Agregação Patológica de Proteínas , Fragmentos de Peptídeos/antagonistas & inibidores , Fragmentos de Peptídeos/metabolismo , Fenóis/química , Fenóis/economia , Extratos Vegetais/economia , Agregados Proteicos/efeitos dos fármacos , Espectrometria de Massas por Ionização por Electrospray , Estereoisomerismo , Estilbenos/análise , Estilbenos/química , Estilbenos/economia , Estilbenos/farmacologiaRESUMO
Berberine and palmatine are two of the main bioactive components in Huangbai, a major Chinese medicinal herb. The current methods to extract these compounds usually involving the usage of inorganic acid and base, are not only complex and time-consuming, but have a low selectivity. In this paper, it was reported that hexane, ethyl acetate and dichloromethane were tested to extract berberine and palmatine from Huangbai powder. The results showed that dichloromethane extracted selectively and effectively berberine and palmatine from Huangbai powder among the examined solvents. In addition, dichloromethane can be recycled and reused, making it a potential candidate for large scale extraction of berberine and palmatine from Huangbai