Perfil tripanocida de lignanas dibenzilbutirolactônicas: avaliação das propriedades terapêuticas in vivo nas fases aguda e crônica da doença de Chagas experimental / Trypanocidal profile of dibenzylbutyrolactone lignans: evaluation of therapeutic properties in vivo, in acute and chronic experimental Chagasdisease

AUTOR(ES)

Viviane Rodrigues Esperandim

DATA DE PUBLICAÇÃO

2010

RESUMO

Chagas disease, transmitted by the protozoan Trypanosoma cruzi, affects over 18 million people in Latin America. Even though it was described 100 years ago by Carlos Chagas, it still represents a major public health problem, and there are cases in 18 developing countries located in Central and South America. In Brazil, benznidazole (Rochagan) is the only trypanocidal drug available in the market; however, it has several side effects and limited efficacy in the chronic phase of the infection. In view of the need for new substances with biological activity against T. cruzi, there is growing interest in the search for compounds capable of acting on the parasite, but are devoid of serious side effects. Studies involving lignans developed in our laboratory have shown that these compounds are significantly active against bloodstream trypomastigotes. So this study aims to evaluate the therapeutic activity of derivatives of dibenzylbutyrolactone lignans in vivo, in the acute and chronic infection by T. cruzi. The present study examined the degree of parasitemia in the infected animals during the acute phase of the disease. To this end, the enzyme -galactosidase was measured in the tissues from the liver, spleen, and heart of infected animals, in addition to the morphometric analysis of these tissues. Cubebin and hinokinin led to significant reduction in parasitemia compared to the negative control, and better treatment was accomplished by the oral route. Concerning -galactosidase analysis, cubebin and hinokinin furnished better results compared to the positive control (Benznidazole), the most effective response to treatment being also achieved by oral route. Karyometry also revealed that cubebin and hinokinin were effective, giving values close to those obtained with the uninfected control, thereby showing that there was a positive cellular response.

ASSUNTO(S)

hinokinin. chagas disease fases aguda e crônica hinoquinina. cubebina cubebin acute and chronic doença de chagas

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