Abstract
The inhibition of lactose synthesis by UDP-glucose, UDP-glucuronate and, less so, by UDP-N-acetylglucosamine was markedly smaller in preparations of "intact" than of lysed vesicles derived from the Golgi apparatus of lactating rat mammary gland. This constitutes evidence for a specific, probably facilitated, transport of UDP-galactose across the Golgi membrane.
MeSH terms
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Animals
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Biological Transport
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Female
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Golgi Apparatus / metabolism*
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Lactation
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Lactose / metabolism
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Lactose Synthase / antagonists & inhibitors
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Mammary Glands, Animal / metabolism*
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Mammary Glands, Animal / ultrastructure
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Membranes / metabolism
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Pregnancy
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Rats
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Uridine Diphosphate Galactose / metabolism*
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Uridine Diphosphate Glucose / pharmacology
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Uridine Diphosphate Glucuronic Acid / pharmacology
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Uridine Diphosphate N-Acetylglucosamine / pharmacology
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Uridine Diphosphate Sugars / metabolism*
Substances
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Uridine Diphosphate Sugars
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Uridine Diphosphate Glucuronic Acid
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Uridine Diphosphate Galactose
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Uridine Diphosphate N-Acetylglucosamine
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Lactose Synthase
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Lactose
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Uridine Diphosphate Glucose