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The observation that ascorbate known to retain pro- oxidant properties induces cel death in a number of immortal cell lines, led us to examine its me-chanism and whether it is involved in oxidative stres injury in such asocorbate-enriched tissue cels as hepatocytes. In rat liver homogenates, higher concentrations (1 and 3 mM) of ascorbate suppressed lipid peroxide productions but lower concentrations (0.1 and 0.3 mM) did not. In con-trast to the homogenate, ascorbate increased lipid tion dependant manner. Iso-ascorbate, the epimer of ascorbate did not cause an increase the oxi-dative stress in liver slices. This diferential effect between homogenates and liver slices implies that cellular integrity is required for ascorbate to in-duce oxidative stress. Wortmannin, an inhibitor of the GLUT (glucose transporter) thought to trans-port dehydroascorbate into cels, inhibited [14C]- ascorbate uptake and suppressed oxidative stress in liver slices. Wortmannin suppressed that [14C]- [14C]dehydroascorbate. Taken together, these ob-servations support our hypothesis that ascorbate is oxidized to dehydroascorbate by molecular oxy-gen in solution (i.e., plasma and culture medium) which is then carried into hepatocytes (via a GLUT) where it is reduced back to ascorbate caus-ing oxidative stress.

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