Artículos de revistas
Prevalence And Intensity Of Infection, Metacyclogenesis And Nuclear Phenotypes In Panstrongylus Megistus (burmeister, 1835) After Ingestion Of Trypanosoma Cruzi (chagas, 1909) Ii And Subjection To Heat Shock [prevalência E Intensidade De Infecção, Metaciclogênese E Fenótipos Nucleares Em Panstrongylus Megistus (burmeister, 1835) Após Ingestão De Trypanosoma Cruzi (chagas, 1909) Ii E Choque De Temperatura]
Registro en:
Brazilian Journal Of Biology. , v. 71, n. 2, p. 491 - 500, 2011.
15196984
10.1590/S1519-69842011000300020
2-s2.0-79960400217
Autor
Garcia S.L.
Rodrigues V.L.C.C.
Garcia N.L.
Mello M.L.S.
Institución
Resumen
This study aimed to contribute to our knowledge of the parasite-vector interaction associated with Trypanosoma cruzi (Chagas, 1909) infection in Panstrongylus megistus (Burmeister, 1835), an important vector of Chagas' disease in Brazil. The prevalence and intensity of T. cruzi infection, the incidence of metacyclogenesis and the frequency of nuclear phenotypes in Malpighian tubules were investigated in nymphs of P. megistus, reared at 28 °C and subjected to heat shock (40 °C, 1 hour) two days after infection with T. cruzi II (Y strain). Following the 45-day post-infection period, the frequency of epimastigotes was much higher than that of trypomastigotes in both heat-shocked and non-shocked insects, and the prevalence of infection was not altered by heat shock. Fewer epimastigotes and trypomastigotes were found in the infected insects subjected to the heat shock, indicating that the multiplication and metacyclogenesis of the parasites were affected by the stress. In infected specimens heat shock promoted an increased frequency of cell nuclei with heterochromatin decondensation, a cell survival response to stress, and did not affect insect survival. The effects of infection and heat shock, especially on the multiplication and metacyclogenesis of T. cruzi, and the observed resistance to heat shock developed by P. megistus nymphs are suggestive that they should be considered when adequate conditions for rearing these infected insects in the laboratory are pursued. 71 2 491 500 Agresti, A., (1990) Categorical Data Analysis, , New York: Wiley Alvarenga, N.J., Bronfen, E., Interação do Trypanosoma cruzi com diferentes vetores: Uso para o xenodiagnóstico (1984) Revista Da Sociedade Brasileira De Medicina Tropical, 17, pp. 145-149 Andrade, S.G., Caracterização de cepas do Trypanosoma cruzi isoladas no Recôncavo Baiano. 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