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Trypanosoma cruzi: chemotherapy with benznidazole in mice inoculated with strains from Paraná State and from different endemic areas of Brazil

By Max Jean de Ornelas TOLEDO, Ana Lúcia Falavigna GUILHERME, José Carlos da SILVA, Marco Venício de GASPERI, Andréa Pereira MENDES, Mônica Lúcia GOMES and Silvana Marques de ARAÚJO

Abstract

Strains of Trypanosoma cruzi from different geographical areas have shown different levels of susceptibility to trypanocidal drugs. The susceptibility in vivo to benznidazole was investigated in eighteen strains of T. cruzi. Twelve were isolated from chronic chagasic patients from different Chagas’ disease endemic areas. The other six strains were isolated from the northwestern region of Paraná state; two of them from patients three from triatomines (Triatoma sordida) and one from wild reservoir (Didelphis sp.). To test drug the infected mice were divided into two groups of twenty. One group was treated with benznidazole for twenty consecutive days and the other group was used as untreated control. The treatment began after detection of the infection by direct blood examination or haemoculture. The control of cure was done through haemoculture and indirect immunofluorescence test. The drug eliminated the inflammatory lesions of the skeletal muscle of mice considered cured and from the heart of most of them. Moreover, the inflammatory lesions were reduced in treated but not cured animals. The T. cruzi strains studied showed a gradient of drug susceptibility that varied from 0% to 100%. Ten strains were considered sensitive to the treatment (61 to 100% of cure), one strain was partially sensitive (50% of cure) and seven strains were considered resistant to the treatment (0 to 40% of cure). This variation was observed both in strains of T. cruzi isolated from domestic and sylvatic cycles<br>Cepas de Trypanosoma cruzi de diferentes áreas geográficas têm mostrado diferentes graus de suscetibilidade a drogas tripanocidas. A suscetibilidade in vivo ao benzonidazol foi investigada em 18 cepas de T. cruzi. Doze foram isoladas de pacientes chagásicos crônicos de diferentes áreas endêmcias da doença de Chagas. Seis cepas foram procedentes da região Noroeste do Paraná: 2 isoladas de humanos, 3 de triatomíneos da espécie Triatoma sordida e 1 do reservatório silvestre do parasito Didelphis sp. No teste da droga, camundongos inoculados foram divididos em 2 grupos de 20. Um grupo foi tratado com benzonidazol por 20 dias consecutivos e o outro grupo foi utilizado como controle não tratado. O tratamento dos animais foi iniciado após constatação da infecção, feita através de exame direto do sangue ou hemocultura. O controle de cura foi feito utilizando a hemocultura e a imunofluorescência indireta, realizadas respectivamente, 30 e 180 dias após o término do tratamento. A droga eliminou as lesões inflamatórias do músculo esquelético dos camundongos considerados curados e do coração da maioria destes animais e as diminuiu naqueles animais tratados não curados. As cepas de T. cruzi estudadas apresentaram um gradiente de suscetibilidade a droga que variou de 0% a 100%. Dez cepas foram consideradas sensíveis ao tratamento (61 a 100% de cura), uma cepa foi parcialmente sensível (50% de cura) e 7 cepas foram consideradas resistentes (0 a 40% de cura). Esta variação foi observada tanto com as cepas isoladas do ciclo doméstico quanto com aquelas isoladas do ciclo silvestr

Topics: Trypanosoma cruzi strains, Northwest of Paraná, Chemotherapy, Benznidazole, Mice, Cepas de Trypanosoma cruzi, Noroeste do Paraná, Quimioterapia, Benzonidazol, Camundongos, Medicine (General), R5-920, Medicine, R, DOAJ:Medicine (General), DOAJ:Health Sciences, Arctic medicine. Tropical medicine, RC955-962
Publisher: Universidade de São Paulo
Year: 1997
DOI identifier: 10.1590/S0036-46651997000500007
OAI identifier: oai:doaj.org/article:67831cfc027a4c7cb48a63581989fd30
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