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PAGES: 741-747 DOI: 10.1590/0074-02760170045 Full paper
Histopathology of murine toxoplasmosis under treatment with dialyzable leukocyte extract

Beatriz Eugenia Fuentes-Castro1,+, Juan Gerardo Reyes-García2, María Teresa Valenzuela-Vargas3, Federico Martínez-Gómez1

1Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Departamento de Parasitología, Ciudad de México, México
2Instituto Politécnico Nacional, Escuela Superior de Medicina, Sección de Estudios de Posgrado e Investigación, Ciudad de México, México
3Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Departamento de Morfología, Ciudad de México, México


BACKGROUND Dialyzable leukocyte extracts (DLEs) contain molecules smaller than 10 kDa with biological activity in receptor organisms. Primarily, they participate in the regulation of the Th1 immune response, which is essential for the control of several intracellular infections, such as toxoplasmosis. This disease is associated with congenital infection, encephalitis or systemic infections in immunocompromised individuals. The clinical course of this infection fundamentally depends on a well-regulated immune response and timely treatment with the appropriate drugs.

OBJECTIVE The aim of this study was to evaluate the effect of treatment with a leukocyte extract, derived from crocodile lymphoid tissue, on the histopathology and brain parasite load in NIH mice that had been infected with cysts of Toxoplasma gondii (ME-49 strain).

METHODS The treatment was applied during the acute and chronic stages of the infection. Histopathological changes were evaluated in the ileum, liver and spleen at one, four and eight weeks after infection and in the brain at week 8. The parasite load was evaluated by counting the cysts of T. gondii found in the brain.

FINDINGS Compared to the control mouse group, the mice infected with T. gondii and under treatment with DLE showed less tissue damage, mainly at the intestinal, splenic and hepatic levels. In addition, a greater percentage of survival was observed, and there was a considerable reduction in the parasite load in the brain.

CONCLUSIONS The results suggest that DLE derived from crocodile is a potential adjunctive therapy in the conventional treatment of toxoplasmosis.

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Financial support: Instituto Politécnico Nacional (Project SIP 20131488).
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Received 4 February 2017
Accepted 1 June 2017