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Type: Artigo de periódico
Title: Vitamin E Supplementation Reduces Oxidative Stress in Beta Thalassaemia Intermedia
Author: Pfeifer, WP
Degasperi, GR
Almeida, MT
Vercesi, AE
Costa, FF
Saad, STO
Abstract: Objective: The aim of this investigation was to study the effect of vitamin E treatment in oxidative stress of red and white cells of beta-thalassaemia intermedia patients. Methods: Nine patients undergoing occasional transfusions (5 females/4 males), median age 39 years (range 15-74), were recruited for oral daily administration of 400 IU vitamin E for 3 months. Twenty-seven milliliters of peripheral blood was obtained before and after 3 months of treatment, and 3 months after treatment completion. In the case of transfused patients (n = 4), blood was obtained at least 30 days after transfusion. Reactive oxygen species (ROS) was measured by flow cytometry; red blood cell (RBC) reduced glutathione (GSH) was measured by dinitrothiocyanobenzene reduction, serum malondialdehyde was measured in terms of thiobarbituric acid-reactive substances (TBARS), and alpha-haemoglobin-stabilizing protein (AHSP) mRNA expression was measured by real-time polymerase chain reaction of reticulocyte RNA extracts. Results: beta-Thalassaemia patients presented basal levels of RBC ROS, GSH and serum TBARS statistically different compared with healthy controls. However, after vitamin E administration, patients presented a significant reduction in erythrocyte RBC ROS and serum TBARS levels. In parallel, red cell GSH was significantly increased after treatment. Peripheral mononuclear cells and T lymphocytes also demonstrated a reduction in ROS production. Therefore, after treatment, no significant differences were detected comparing patients and normal controls. Three months after treatment completion, all measurements showed a tendency of returning to basal values. A significant reduction in reticulocyte number was observed after vitamin E treatment. Vitamin E treatment did not modify levels of haemoglobin or AHSP mRNA expression. Conclusion: Although vitamin E is not capable of reducing anaemia in these patients, it could be useful for reducing oxidative damage in other target organs of beta-thalassaemic patients. Finally, this is the first study to analyse the effects of vitamin E on ROS production in red and white blood cells and AHSP mRNA expression. Copyright (C) 2009 S. Karger AG, Basel
Subject: alpha-Haemoglobin-stabilizing protein
Reactive oxygen species
Reduced glutathione
Vitamin E
Country: Suíça
Editor: Karger
Citation: Acta Haematologica. Karger, v. 120, n. 4, n. 225, n. 231, 2008.
Rights: fechado
Identifier DOI: 10.1159/000201988
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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