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- W2111397556 abstract "Leucine and β-(±)-2-aminobicyclo[2.2.1]heptane-2-carboxylic acid (BCH) stimulated, in a dose-dependent manner, reductive amination of 2-oxoglutarate in rat brain synaptosomes treated with Triton X-100. The concentration dependence curves were sigmoid, with 10–15-fold stimulations at 15 mM leucine (or BCH); oxidative deamination of glutamate also was enhanced, albeit less. In intact synaptosomes, leucine and BCH elevated oxygen uptake and increased ammonia formation, consistent with stimulation of glutamate dehydrogenase (GDH). Enhancement of oxidative deamination was seen with endogenous as well as exogenous glutamate and with glutamate generated inside synaptosomes from added glutamine. With endogenous glutamate, the stimulation of oxidative deamination was accompanied by a decrease in aspartate formation, which suggests a concomitant reduction in flux through aspartate aminotransferase. Activation of reductive amination of 2-oxoglutarate by BCH or leucine could not be demonstrated even in synaptosomes depleted of internal glutamate. It is suggested that GDH in synaptosomes functions in the direction of glutamate oxidation, and that leucine may act as an endogenous activator of GDH in brain in vivo." @default.
- W2111397556 created "2016-06-24" @default.
- W2111397556 creator A5072959814 @default.
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- W2111397556 date "1990-04-01" @default.
- W2111397556 modified "2023-09-27" @default.
- W2111397556 title "Activation of Glutamate Dehydrogenase by Leucine and Its Nonmetabolizable Analogue in Rat Brain Synaptosomes" @default.
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- W2111397556 doi "https://doi.org/10.1111/j.1471-4159.1990.tb01967.x" @default.
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