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Type: Artigo de periódico
Title: Changes in nuclear phenotype frequencies following sequential cold shocks in Triatoma infestans (Hemiptera, Reduviidae)
Author: Campos, Silvana GP
Rodrigues, Vera Lúcia CC
Mello, Maria Luiza S
Abstract: The nuclear phenotypes of Malpighian tubule cells in fifth instar nymphs of Triatoma infestans, one of the most important vectors of Chagas disease, were studied following sequential shocks at 0ºC, separated by intervals of 8 h and 24 h at 30ºC, under conditions of moderate fasting and full nourishment. The insects pertained to colonies reared in the laboratory and originated from domestic specimens collected in the Brazilian states of São Paulo (north) and Minas Gerais (south). Since nuclear phenotypes in this species are affected by single cold shocks, it was expected that these phenotypes could also be changed by sequential shocks. Nuclear phenotypes indicative of mechanisms of cell survival (nuclear fusion and heterochromatin decondensation) and cell death (apoptosis and necrosis) were observed concomitantly in all the conditions tested. Nuclear fusion and heterochromatin decondensation were not found relevant for the presumed acquisition of the cold-hardening response in T. infestans. The decreased frequency of apoptosis and necrosis following sequential cold shocks including under fasting conditions, indicated that tolerance to sequential cold shocks occurred in T. infestans of the mentioned origin.
Subject: cold shocks
sequential shocks
nuclear phenotypes
Triatoma infestans
Editor: Instituto Oswaldo Cruz, Ministério da Saúde
Rights: aberto
Identifier DOI: 10.1590/S0074-02762002000600019
Date Issue: 1-Sep-2002
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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