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- W1828080324 abstract "Effects of feeding frequency on liver branched-chain α-keto acid dehydrogenase (BCKAD) activity are unknown. In the present study, rats were trained to consume their daily allotment of food in 6 h (meal-feeding). Rats were fed diets containing 0, 9, 25 or 50% casein and after 10 d were killed before or 3 h after the meal. The enzyme in rats fed diets containing 0, 9 and 25% casein was activated three- to sixfold after meal consumption. Previous studies showed that the liver enzyme is essentially fully activated in post-absorptive rats fed an adequate protein diet ad libitum. Meal-feeding an adequate protein (25% casein) diet resulted in a marked decrease in the postabsorptive percentage of active complex compared to ad libitum feeding of the same diet (29 ± 6% vs. 93 ± 6% active). Administration of α-ketoisocaproate (200 µmol/100 g body weight, an inhibitor of BCKAD kinase) reversed the meal-feeding-induced inactivation of the complex within 10 min. We conclude that the frequency of food intake, in addition to the level of dietary protein, influences the proportion of liver BCKAD in the active state. Inactivation of hepatic BCKAD in rats trained to feed once a day may be an adaptive mechanism that results in increased efficiency of branched-chain amino acid utilization between meals." @default.
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- W1828080324 date "1990-07-01" @default.
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- W1828080324 title "Regulation of Rat Liver Branched-Chain α-Keto Acid Dehydrogenase Activity by Meal Frequency and Dietary Protein" @default.
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- W1828080324 doi "https://doi.org/10.1093/jn/120.7.793" @default.
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