Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/62910
Type: Artigo de periódico
Title: Characterization of the peroxidase system at low H2O2 concentrations in isolated neonatal rat islets
Author: Stoppiglia, LF
Rezende, LF
Ferreira, F
Filiputti, E
Carneiro, EM
Boschero, AC
Abstract: B cell destruction during the onset of diabetes mellitus is associated with oxidative stress. In this work, we attempted to further trace the fate of H2O2 inside the pancreatic islets and determine whether it is mediated by enzymatic (peroxidase) activity or by chemical reaction with thiols from any protein chain. Our results suggest that the islet cells have a very similar peroxidase activity at the hydrophilic (cytoplasm) and hydrophobic compartments (organelles and nucleus), independent of the catalase content of the samples. This activity is composed of sacrificial thiols and by proteins with Fe3+/Mn3+ ions at non-heme catalytic sites. The capacity of the hydrophobic fraction to scavenge O-2(-) was increased in the presence of high concentrations of NADP and RS and was highly dependent on RSH. On the contrary, the hydrophilic fraction exhibited a low RSH-dependent activity where the O-2(-) scavenging is related to metal Cu2+/Fe3+/Mn3+ ions attached to the protein molecules. (C) 2004 Elsevier B.V. All rights reserved.
Subject: NADPH
neonatal pancreatic islet
oxidative stress
peroxidase
H2O2
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.bbadis.2004.06.005
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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