Abstract
In rat pancreatic islets, tumoral islet cells (RINm5F line), parotid gland, and in human erythrocytes, but not in rat hepatocytes, the production of 3H2O from D-[2-3H]glucose is 20-30% lower than from D-[5-3H]glucose. This coincides with the production of tritiated lactic acid from D-[2-3H]glucose and may be attributable to an intramolecular hydrogen transfer in the phosphoglucoisomerase reaction. It is concluded that the production of 3H2O from D-[2-3H]glucose is not a reliable tool to assess the total rate of hexose phosphorylation.
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