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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/24202


Title: Changes in Nuclear Phenotype Frequencies Following Sequential Cold Shocks in Triatoma infestans (Hemiptera, Reduviidae)
Authors: Campos, Silvana G. P.
Rodrigues, Vera Lúcia Cortiço Corrêa
Mello, Maria Luiza S.
Keywords: cold shocks - sequential shocks - nuclear phenotypes - Triatoma infestans  
Issue Date: 31-Dec-2002
Publisher: Fundação Oswaldo Cruz, Fiocruz
Citation: Memórias do Instituto Oswaldo Cruz (ISSN: 1678-8060) Vol 97 Num 6
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.
URI: http://hdl.handle.net/1807/24202
Other Identifiers: http://www.bioline.org.br/abstract?id=oc02164
Rights: Copyright 2002 - Instituto Oswaldo Cruz - Fiocruz
Appears in Collections:Bioline International Legacy Collection

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