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• W2079709825 abstract "Abstract A study was made of factors regulating the oxidation of ethanol in liver cells isolated from fed and fasted rats. The rate of ethanol oxidation was greater in liver cells from fed rats than from fasted rats. Inhibitors of the malate-aspartate shuttle decreased the rate of ethanol oxidation, suggesting that this shuttle contributes to the reoxidation of cytosolic NADH produced during the oxidation of ethanol. The greater inhibition of ethanol oxidation by antimycin than by rotenone suggests that the α-glycerophosphate shuttle also plays an important role in transporting reducing equivalents. The components of the malate-aspartate and α-glycerophosphate shuttles stimulated ethanol oxidation to a greater extent in liver cells from fasted rats than those from fed rats, suggesting that in the fasted state, ethanol oxidation is regulated by the intracellular concentrations of substrate shuttle components which transfer reducing equivalents into the mitochondria. Therefore, uncoupling agents, which stimulate oxygen consumption, do not stimulate ethanol oxidation, and concentrations of antimycin which depress oxygen uptake are much less effective in decreasing ethanol oxidation. By contrast, in liver cells from fed rats, the rate of ethanol oxidation was increased by uncoupling agents. Such stimulation was not observed when cells were prepared in the absence of albumin, probably due to leakage of shuttle substrates which leads to abnormally low intracellular levels. Indeed, when the shuttle substrates were added back to these preparations, uncouplers were effective in stimulating the rate of ethanol oxidation beyond the stimulation produced by the shuttle substrates alone. Thus, under conditions of sufficient intracellular levels of the intermediates of the substrate shuttles, ethanol oxidation is regulated by the capacity of the mitochondrial respiratory chain to reoxidize reducing equivalents generated by the alcohol dehydrogenase reaction." @default.
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• W2079709825 date "1977-10-01" @default.
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• W2079709825 title "Transfer and reoxidation of reducing equivalents as the rate-limiting steps in the oxidation of ethanol by liver cells isolated from fed and fasted rats" @default.
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• W2079709825 doi "https://doi.org/10.1016/0003-9861(77)90398-8" @default.
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