Trypanosoma cruzi: susceptibility to chemotherapy with benznidazole of clones isolated from the highly resistant Colombian strain



Document title: Trypanosoma cruzi: susceptibility to chemotherapy with benznidazole of clones isolated from the highly resistant Colombian strain
Journal: Revista da Sociedade Brasileira de Medicina Tropical
Database: PERIÓDICA
System number: 000282428
ISSN: 0037-8682
Authors: 1



Institutions: 1Fundacao Instituto Oswaldo Cruz, Centro de Pesquisas Goncalo Moniz, Salvador, Bahia. Brasil
Year:
Season: Mar-Abr
Volumen: 36
Number: 2
Pages: 201-209
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Descriptivo
English abstract The present investigation was performed to evaluate the susceptibility of seven clones isolated from the highly resistant Colombian strains, prototype of Biodeme Type III. Seven clones previously obtained, showed a phenotypic homogeneity and high similarity with the parental strain. Eight groups of 30 mice were inoculated with one of seven clones or the parental strain; 20 were treated with benznidazole (100mg/kg/day) and 10 were untreated controls. Cure evaluations were done by parasitological and serological tests and PCR. Cure rates varied from 0% (null) to 16.7%. Correlation between positivity of parasitological and serological tests with positive PCR reached 37%. The results demonstrated the high resistance of the clones, suggesting the predominance of a highly resistant principal clone in this strain. The findings apparently indicate that the possibility of cure is minimal for patients infected with this biodeme; a fact that could affect the control of Chagas' disease through treatment of chronically infected people
Portuguese abstract A presente investigação visa avaliar a suscetibilidade ao benzonidazol de sete clones isolados da cepa Colombiana do Trypanosoma cruzi, protótipo do biodema III , altamente resistente aos quimioterápicos. Os clones préviamente obtidos apresentavam homogeneidade fenotípica e alta similaridade com a cepa parental. Oito grupos de 30 camundongos foram inoculados com cada um dos sete clones e a cepa parental;20 foram tratados com benzonidazol 100mg/kg/dia e 10 foram controles não tratados. A avaliação da cura foi feita por testes parasitológicos, sorológicos e o PCR. Os índices de cura variaram de 0%(nulo) a 16,7%. Correlação entre a positividade dos testes parasitológicos e sorológicos com a da PCR alcançou 37%. Os resultados demonstraram a alta resistência dos clones, sugerindo a predominância de um clone principal, muito resistente à quimioterapia nesta cepa. Isto indica que as possibilidades de cura de pacientes infectados com este biodema são mínimas, o que poderá interferir no controle da doença através do tratamento de individuos cronicamente infectados
Disciplines: Biología,
Medicina
Keyword: Parasitología,
Medicina experimental,
Microbiología,
Quimioterapia,
Resistencia,
Benzonidazol,
Enfermedad de Chagas,
Roedores,
Animales de laboratorio,
Trypanosoma cruzi
Keyword: Biology,
Medicine,
Parasitology,
Experimental medicine,
Microbiology,
Chagas disease,
Trypanosoma cruzi,
Chemotherapy,
Resistance,
Benznidazole,
Rodents,
Laboratory animals
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