title: Effect of vitamins C and E on oxidative processes in human erythrocytes.
abstract: The oxidative action of 1 mmol l(-1) phenylhydrazine hydrochloride (PH) was studied on human erythrocytes treated with the antioxidants vitamin C (vit. C) and vitamin E (vit. E). The erythrocytes were resuspended in PBS to obtain 35% cell packed volume, and then submitted to the oxidative action of PH for 20 min, with or without previous incubation for 60 min with vit. C or vit. E. Heinz bodies and methemoglobin formation by PH were inhibited in the presence of vit. C. At the concentration of 90 mmol l(-1), vit. C, not only seemed to lose its antioxidant effect, but it also promoted an increase in methemoglobin formation. Vit. C (0.5-80 mmol l(-1)) did not protect against GSH depletion by PH. Vit. C alone produced insignificant hemolysis, but, in the presence of PH, the hemolysis indices were more accentuated. Heinz body formation by PH was inhibited in the presence of vit. E. Formation of methemoglobin induced by PH was decreased by vit. E (0.1-2 mmol l(-1)), although vit. E (3-80 mmol l(-1)) did not lower the concentration of methemoglobin and did not lead to the recovery of the GSH depleted by PH. The results obtained suggest that vit. C and vit. E contribute to the decrease in oxidative stress caused by PH.
authors.affiliation: Programa de Pós-Graduação em Ciências Farmacêuticas da Universidade Federal do Paraná, Campus Jardim Botânico, Avenida Lothário Meissner 3400, CEP 80210-170 Curitiba, PR, Brazil.
authors.forename: Ligia Maria
authors.initials: LM
authors.lastname: Claro
authors.forename: Maria Suely Soares
authors.initials: MS
authors.lastname: Leonart
authors.forename: Samuel Ricardo
authors.initials: SR
authors.lastname: Comar
authors.forename: Aguinaldo José
authors.initials: AJ
authors.lastname: do Nascimento
mesh_terms: D000328:Adult; D000975:Antioxidants / Q000494:pharmacology*; D001205:Ascorbic Acid / Q000494:pharmacology*; D004912:Erythrocytes / Q000187:drug effects* / Q000378:metabolism*; D005260:Female; D005978:Glutathione / Q000187:drug effects / Q000378:metabolism; D006801:Humans; D008297:Male; D008875:Middle Aged; D010084:Oxidation-Reduction / Q000187:drug effects; D010659:Phenylhydrazines / Q000037:antagonists & inhibitors / Q000494:pharmacology; D012016:Reference Values; D014810:Vitamin E / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D010659:Phenylhydrazines; C030299:phenylhydrazine; D014810:Vitamin E; D005978:Glutathione; D001205:Ascorbic Acid