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- W2330578975 abstract "Perfusion of rat livers with 10 mM-fructose or pretreatment of the rat with 6-aminonicotinamide (70 mg/kg) 6 h before perfusion decreased intracellular ATP concentrations and increased the rate of p-nitroanisole O-demethylation. This increase was accompanied by a decrease in the free [NADP+]/[NADPH] ratio calculated from concentrations of substrates assumed to be in near-equilibrium with isocitrate dehydrogenase. After pretreatment with 6-aminonicotinamide the [NADP+]/[NADPH] ratio also declined. Reduction of NADP+ during mixed-function oxidation may be explained by inhibition of of one or more NADPH-generating enzymes. Glucose 6-phosphate dehydrogenase, 6-phosphogluconate dehydrogenase, isocitrate dehydrogenase and “malic” enzyme, partially purified from livers of phenobarbital-treated rats, were inhibited by ATP and ADP. Inhibitor constants of ATP for the four dehydrogenases varied considerably, ranging from 9 micrometer for “malic” enzyme to 1.85 mM for glucose 6-phosphate dehydrogenase. NADPH-cytochrome c reductase was also inhibited by ATP (Ki 2.8 mM) and by ADP (Ki 0.9 mM), but not by AMP. Concentrations of ATP and ADP that inhibited glucose 6-phosphate dehydrogenase and the reductase were comparable with concentrations in the intact liver. Thus agents that lower intracellular ATP may accelerate rates of mixed-function oxidation by a concerted mechanism involving deinhibition of NADPH-cytochrome c reductase and one or more NADPH-generating enzymes." @default.
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- W2330578975 title "Regulation of p-nitroanisole O-demethylation in perfused rat liver. Adenine nucleotide inhibition of NADP+-dependent dehydrogenases and NADPH-cytochrome c reductase" @default.
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- W2330578975 doi "https://doi.org/10.1042/bj1840675" @default.
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