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SUPPRESSION OF NA+ INFLUX IN ATP-DEPLETED HEPATOCYTES

机译:ATP缺失的肝细胞中NA +内流的抑制

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The change of cytosolic Na+ concentration was examined in ATP-depleted cultured rat hepatocytes. Cytosolic Na+ concentration was increased in the hepatocytes where ATP was more than 95% depleted by chemical hypoxia with 2.5 mM KCN and 0.5 mM iodoacetate as reported in J. Biol. Chem. 266 20062-20069 (1991). However, the effect was due to the iodoacetate-treatment rather than the ATP-depletion, because the Na+ concentration was increased not by KCN but by iodoacetate, while KCN decreased ATP more than iodoacetate. Although oligomycin (10 mu g/ml) decreased ATP to less than 5%, it did not increase cytosolic Na+ concentration much within 50 min. Ouabain (1.0 mM), an inhibitor of Na+-K+ pump, increased the Na+ concentration, and the increase was suppressed by oligomycin. These results suggested that Na+ influx was suppressed in ATP-depleted hepatocytes. [References: 25]
机译:在ATP耗尽的大鼠肝细胞中检查了胞质Na +浓度的变化。如J.Biol.Chem.Soc。,2005,2,3,3,4,4,4,3,4,3,4,3,4,3,4,3,4,3,4,3,4,4,3,4,4,5,5,5,5,7,10,12,12,12,5,6,7,8,5,6,7,7,8,7,8,7,7,5,5,6,7,5,6,7,5,6,7,5,6,3,3,3,4,3,3,4,3,3,3,3,3,3,3,3,3,3,4,3,3,3,3,4,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,3。化学266 20062-20069(1991)。但是,该效果是由于碘乙酸盐处理而不是ATP消耗所致,因为Na +浓度不是通过KCN而是通过碘乙酸盐增加,而KCN却比碘乙酸盐降低了更多的ATP。尽管寡霉素(10μg / ml)将ATP降低至小于5%,但在50分钟内并没有增加胞质Na +的浓度。哇巴因(1.0 mM)是Na + -K +泵的抑制剂,增加了Na +的浓度,而这种增加被寡霉素抑制。这些结果表明Na +内流在ATP耗尽的肝细胞中得到抑制。 [参考:25]

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