Absence of experimental cross-protection induced by a Trypanosoma cruzi-like strain isolated from bats

Revista da Sociedade Brasileira de Medicina Tropical

Gabriel Antonio Nogueira Nascentes¹  Wendell Sérgio Ferreira Meira¹  Eliane Lages-silva¹  Luis Eduardo Ramírez¹ 

[1] ,Universidade Federal do Triângulo Mineiro Departamento de Ciências Biológicas Uberaba MG

关键词: Trypanosoma cruzi;    Trypanosoma cruzi-like;    Bat trypanosomatids;    Cross-protection;    Eosinophils;    Trypanosoma cruzi;    Trypanosoma cruzi-like;    Tripanossomatídeos de morcego;    Proteção cruzada;    Eosinófilos;   

DOI  :  10.1590/S0037-86822008000200004

来源: SciELO

【 摘 要 】

This study evaluated the possibility of inoculation and reinoculation with a trypanosomatid isolated from bats that is morphologically, biologically and molecularly similar to Trypanosoma cruzi, to protect against infection by virulent strains. Non-isogenic mice were divided into 24 groups that received from zero to three inoculations of Trypanosoma cruzi-like strain RM1, in the presence or absence of Freund's adjuvant, and were challenged with the VIC or JG strains of Trypanosoma cruzi. Parasitemia and survival were monitored and animals were sacrificed for histopathological analysis. Animals immunized with Trypanosoma cruzi-like strain RM1 presented decreased parasitemia, independently of the number of inoculations or the presence of adjuvant. In spite of this reduction, these animals did not present any protection against histopathological lesions. Severe eosinophilic infiltrate was observed and was correlated with the number of inoculations of Trypanosoma cruzi-like strain RM1. These findings suggest that prior inoculation with this strain did not protect against infection but, rather, aggravated the tissue inflammatory process.

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