Decreased reduced glutathione and glutathione reductase activity in subjects with hemoglobin C.
Erythrocyte catalase, reduced glutathione, glutathione peroxidase and glutathione reductase were determined in 17 normal black controls, 8 subjects with Hb AC, 12 with Hb SC, 1 with Hb CC and 18 patients with sickle cell anemia. Catalase and glutathione peroxidase activities were decreased in sickle cell anemia. Reduced glutathione and glutathione reductase activity were significantly lower in subjects with Hb C (AC, CC, SC). Differences were observed between Hb C, Hb S and Hb A as regards red cell dehydration, intracellular crystallization, enhanced potassium efflux, an increased number of titratable SH groups in Hb C and the binding of Hb C to band 3 on the inner membrane surface. A decrease in reduced glutathione, probably due to inhibition or decreased synthesis of glutathione reductase, was also observed. All these factors may determine oxidation of Hb C, possibly contributing to the hemolysis in patients with Hb C disease.
Saad
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Department of Clinical Medicine, State University of Campinas, UNICAMP-Brazil.
Salles
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Velho
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D000293:Adolescent; D000328:Adult; D004912:Erythrocytes / Q000378:metabolism*; D005978:Glutathione / Q000097:blood*; D005980:Glutathione Reductase / Q000097:blood*; D006441:Hemoglobin A / Q000378:metabolism*; D006444:Hemoglobin C / Q000378:metabolism*; D006451:Hemoglobin, Sickle / Q000378:metabolism*; D006801:Humans; D010084:Oxidation-Reduction
D006451:Hemoglobin, Sickle; D006444:Hemoglobin C; D006441:Hemoglobin A; D005980:Glutathione Reductase; D005978:Glutathione