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Trypanocidal potential of copalic acids derivatives

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Author(s):
Gisele Bulhões Portapilla
Total Authors: 1
Document type: Master's Dissertation
Press: Ribeirão Preto.
Institution: Universidade de São Paulo (USP). Faculdade de Ciências Farmacêuticas de Ribeirão Preto (PCARP/BC)
Defense date:
Examining board members:
Sérgio de Albuquerque; Niege Araçari Jacometti Cardoso Furtado; Clovis Wesley Oliveira de Souza
Advisor: Sérgio de Albuquerque
Abstract

Chagas\' disease is one of the most important tropical neglected diseases in global public health, affecting thousands of people, and exposing other ones to the infection risk. According to the literature, therapies with benznidazole and nifurtimox cause serious side effects, and show low efficacy during the chronic phase of the disease. Phytochemical studies showed that copaiba oils obtained from threes of Copaifera genus present several terpenes that show high activity and selectivity against Trypanosoma cruzi. In order to search alternative molecules for this treatment, the aim of this study was to determine the in vivo potential trypanocidal effect of semisynthetic derivatives obtained by the terpenes caryophyllene oxide and copalic acid. We obtained copalic acid by chromatographic methods but due some difficulties during the procedure, we could find no semisynthetic derivatives from this substance besides, some purposed methodologies allowed the obtaining of the diterpene acid 19-ent-cauranoic that was not commonly described on the literature. The synthesis reactions for caryophyllene oxide resulted in eight semisynthetic derivatives (D1 to D8). So, we could determine the in vivo biological activities of the following compounds: copaiba oil, acid 19-ent-cauranoic, copalic acid, caryophyllene oxide, D1 to D8 derivatives, and Benznidazole. D8 was unstable in the presence of light. Cytotoxic activities of the compounds were evaluated by cellular mammal strain LLC-MK2 and trypanocidal activity assays, obtained from epimastigotes and trypomastigotes forms of Bolivia and Y strains. All the substances showed high activity on the evolutive forms of T.cruzi when compared with the row product. Besides, the action of great part of the substances has been shown more selectivity for parasites than the mammals´ cells. The test results of chemical structure of D3 showed that its derivative was effective for both cases reducing the toxicity, and being active for Bolivia and Y strains. Obtained data confirmed the effectiveness of the synthetic organic chemistry as a very important way to increase the action of substances therapeutically so useful that posterior studies will be accomplished in order to determine the activity of these new in vivo compounds protocols, as well as to indicate its possible action mechanisms on biological structures or metabolic routes of the protozoa T. cruzi. (AU)