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- W2004382209 abstract "The erythrocyte can phosphorylate a variety of hexoses. Since it can consume mannose and glucose equivalently in the hereditary deficiencies of hexokinase and phosphoglucose isomerase and since erythrocyte defense against oxidants is impaired in a variety of hereditary hemolytic anemias, we tested the hypothesis that mannose may be a significant alternative to glucose as a fuel for this defense system. Unexpectedly, mannose inhibited defense against oxidants as manifested by increased Heinz body formation when both normal and high-reticulocyte erythrocytes were incubated with acetylphenylhydrazine (APH). Using APH as the oxidant, mannose-incubated erythrocytes had decreased reduced glutathione stability and impaired hexose oxidation by the pentose shunt compared to glucose-incubated erythrocytes. After incubation with mannose and APH, normal erythrocytes showed a decrease in ATP content. Approximately 25% of the consumed mannose accumulated in the erythrocytes as mannose 6-phosphate. Erythrocytes incubated with mannose and APH displayed a significant loss of redox potential as manifested by decreased NADH/(NADH + NAD+) and NADPH/(NADPH + NADP+) ratios. Since phosphomannose isomerase is the rate-limiting step for mannose metabolism, our results suggest that mannose impairs erythrocyte defense against oxidants by causing ATP depletion and by impairing the regeneration of reduced pyridine nucleotides by the Embden-Meyerhof and pentose phosphate pathways." @default.
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- W2004382209 date "1988-01-12" @default.
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- W2004382209 title "Inhibitory effect of mannose on erythrocyte defense against oxidants." @default.
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- W2004382209 doi "https://doi.org/10.1016/0304-4165(88)90072-4" @default.
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