(Eh) y metanólico (Em) de Pera distichophylla sobre un aislado de ...
(Eh) y metanólico (Em) de Pera distichophylla sobre un aislado de ...
(Eh) y metanólico (Em) de Pera distichophylla sobre un aislado de ...
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Artículo Original<br />
14<br />
Rev. Ibero-Latinoam. Parasitol. (2012); 71 (1): 14-22<br />
Susceptibilidad in vitro a Nifurtimox y Benznidazol <strong>de</strong><br />
<strong>aislado</strong>s <strong>de</strong> Trypanosoma cruzi obtenidos <strong>de</strong> pacientes<br />
venezolanos con enfermedad <strong>de</strong> Chagas infectados por<br />
mecanismos <strong>de</strong> transmisión oral y vectorial<br />
MUÑOZ-CALDERÓN A., SANTANIELLO A., PEREIRA A., YANNUZZI J.,<br />
DÍAZ-BELLO Z. y ALARCÓN <strong>de</strong> NOYA B.<br />
Sección <strong>de</strong> Inm<strong>un</strong>ología, Instituto <strong>de</strong> Medicina Tropical - Universidad Central <strong>de</strong> Venezuela, Caracas, Distrito Capital,<br />
Venezuela.<br />
ABSTRACT<br />
IN VITRO SUSCEPTIBILITY TO NIFURTIMOX AND BENzNIDAzOLE TO TRYPANOSOMA<br />
CRUZI ISOLATES OBTAINED FROM VENEzUELAN PATIENTS WITH CHAGAS DISEASE<br />
INFECTED BY ORAL AND VECTOR TRANSMISSION MECHANISMS)<br />
The frequent reports of outbreaks of acute Chagas disease (CD) by ingestion of contaminated food,<br />
illustrate the importance of this transmission mo<strong>de</strong>l. The present study, evaluate for the first time the in vitro<br />
susceptibility of parasite isolates obtained from Venezuelan patients with Chagas’ disease infected by oral<br />
and vector transmission mechanisms to the drugs Nifurtimox and Benznidazole. We used epimastigotes<br />
and trypomastigotes of Trypanosoma cruzi isolates from four patients with CD. Concentrations of 1x10 8<br />
P/mL were incubated for 72 hours with drugs Nifurtimox and Benznidazole in a range of 0.03 to 4000μM.<br />
Used the MTT colorimetric technique for assessing cell viability and calculated the IC 50 values for each<br />
of the isolated parasites. The isolates tested and two parasitic <strong>de</strong>velopmental stages were shown to be<br />
susceptible to Nifurtimox and Benznidazole drugs with IC 50 values vary greatly among themselves. The<br />
statistical analysis showed that the drug Nifurtimox was more effective than Benznidazole (p < 0.05) in the<br />
trypomastigote stage and two stage epimastigote isolates. We could characterize the in vitro activity of the<br />
drugs Nifurtimox and Benznidazole against human isolates of T. cruzi with different routes of transmission<br />
in Venezuela, showing greater sensitivity on the epimastigote stage with respect to the trypomastigote stage.<br />
Key words: Chagas disease. Trypanosoma cruzi. Oral transmission. IC 50 . Epimastigote. Trypomastigote.<br />
Recibido: 1 <strong>de</strong> Abril <strong>de</strong> 2012. Aceptado: 10 <strong>de</strong> J<strong>un</strong>io <strong>de</strong> 2012.<br />
Correspon<strong>de</strong>ncia: Muñoz-Cal<strong>de</strong>rón A. Sección <strong>de</strong> Inm<strong>un</strong>ología, Instituto <strong>de</strong> Medicina Tropical, Facultad <strong>de</strong> Medicina,<br />
Universidad Central <strong>de</strong> Venezuela, Los Chaguaramos, Código Postal 1041, Caracas, Venezuela.<br />
E-mail: arturomc35@gmail.com; belkisyole@yahoo.com.mx. Tel.: (0058)212-6053560. Tel.-fax:<br />
(0058)212-6053551.