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Type: Artigo de periódico
Title: Sulphydryl groups and their relation to the antioxidant enzymes of chelonian red blood cells.
Author: Torsoni, MA
Viana, RI
Ogo, SH
Abstract: Thiol groups of hemoglobin and blood glutathione are higher in Geochelone carbonaria than in Geochelone denticulata. Exposure of stripped hemolysate of both tortoises to terc-butyl hydroperoxide, resulted in a higher ferroheme oxidation of G. denticulata hemoglobin. In this example glutathione reductase and glutathione peroxidase, were not active due to the absence of GSH and NADPH, suggesting that the thiol groups of G. carbonaria hemoglobin act as antioxidant, similar to GSH. In the total hemolysate, however, where the antioxidant enzymes are active, both species showed similar levels of hemoglobin oxidation, suggesting that the protective effect of thiol groups of hemoglobin are less effective for heme protection. The activity of glutathione reductase and glutathione peroxidase was higher in erythrocytes of G. denticulata and the activity of catalase and superoxide dismutase was higher in erythrocytes of G. carbonaria.
Subject: hemoglobin
thiol groups
antioxidant enzymes
reactive oxygen species
lipid peroxidation
Country: Australia
Editor: Academic Press Aust
Citation: Biochemistry And Molecular Biology International. Academic Press Aust, v. 46, n. 1, n. 147, n. 156, 1998.
Rights: fechado
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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