Antioxidant Roles of Cellular Ubiquinone and Related Redox Cycles : Potentiated Resistance of Rat Hepatocytes Having Stimulated NADPH-Dependent Ubiquinone Reductase against Hydrogen Peroxide Toxicity

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Protective effect of the cellular ubiquinone (UQ) reducing system linked to cytosolic NADPH-dependent ubiquinone reductase (NADPH-UQ reductase) against hydrogen peroxide (H_2O_2)-induced lipid peroxidation was investigated using UQ and control hepatocytes freshly isolated from rats injected with UQ-10 and the vehicles 14 d in advance, respectively. The UQ hepatocytes had higher levels of ubiquinol (UQH_2)-10 content and NADPH-UQ reductase activity than the control hepatocytes but did not differ in other antioxidant factors from the latter cells. The UQ hepatocytes exhibited higher cell viability and lower release of lactate dehydrogenase than the control hepatocytes when they were exposed to H_2O_2 of up to 100 mM for 1 h at 37℃. Furthermore, the formation of thiobarbituric acid reactive substances (TBARS) by H_2O_2 was almost completely inhibited in the UQ hepatocytes. Decreases in UQH_2 and α-tocopherol contents and NADPH-UQ reductase activity by H_2O_2 exposure were observed in both types of the hepatocytes, but those levels in the UQ hepatocytes after the exposure were still higher than in the control hepatocytes. The decreases in ascorbic acid, reduced glutathione and protein thiol contents and DT-diaphorase activity by H_2O_2 were not different between in the two types of hepatocytes. Antioxidant enzyme activities of catalase, superoxide dismutase, glutathione peroxidase, glutathione S-transferase and glutathione reductase in the hepatocytes were not inhibited by H_2O_2. From these results, it was concluded that the cellular UQ reducing system linked to cytosolic NADPH-UQ reductase functions mainly as an antioxidant defense for cellular membranes.
公益社団法人日本薬学会の論文
1999-11-15

Antioxidant Roles of Cellular Ubiquinone and Related Redox Cycles : Potentiated Resistance of Rat Hepatocytes Having Stimulated NADPH-Dependent Ubiquinone Reductase against Hydrogen Peroxide Toxicity

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