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- W1985454940 abstract "Abstract— –Enzymic transformation of [4-14C]dehydroepiandrosterone or [4-14C]dehydro-epiandrosterone sulphate to androstenediol or its sulphate occurred when incubated with a microsomal preparation of rat brain or a whole rat blood homogenate. The brain enzyme which appeared to cause this transformation had a pH optimum at 60, was NADPH2-dependent, and had an apparent Km of 4·6 × 10−6m. When the subcellular fractions of rat brain were compared for transformation, microsomes had the highest specific activity, followed by the cytosol. The crude nuclear and mitochondrial fractions had no significant activity. The level of enzymic activity in the brain microsomes increased from that for rats sacrificed at 7 days of postnatal age to a maximum for rats sacrificed at 1 month of age; then the activity appeared to level off in rats older than 1 month. Microsomes obtained from the cerebellum had the highest specific activity in comparison to that obtained from the cerebral cortex, the diencephalon, and the brain stem. The incubated preparations of rat brain also converted dehydroepiandrosterone sulphate to androstenediol sulphate without hydrolysis. The enzyme in rat blood which was similar to that in the brain was also partially characterized. The blood enzyme had a pH optimum at 6–5, was nearly exclusively present in erythrocytes, was also NADPH2-dependent, and had an apparent Km of 2·7 × 10−4m. The developmental pattern of the blood enzyme specific activity was similar to that of the rat brain enzyme. Upon haemolysis, most activity was recovered in the haemolysate." @default.
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- W1985454940 date "1973-01-01" @default.
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- W1985454940 title "IN VITRO TRANSFORMATION OF DEHYDROEPIANDROSTERONE OR ITS SULPHATE INTO ANDROSTENEDIOL OR ITS SULPHATE BY RAT BRAIN AND BLOOD PREPARATIONS2" @default.
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- W1985454940 doi "https://doi.org/10.1111/j.1471-4159.1973.tb12118.x" @default.
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