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Cellular gluconeogenesis by lactating bovine mammary tissue.

R A Scott, D E Beuman, J H Clark

    Journal of Dairy Science
    |January 1, 1976
    PubMed
    Summary

    Cow mammary tissue cannot convert gluconeogenic substrates into glucose for lactose synthesis. Glucose is the primary carbon source for lactose, with glycerol also contributing, but other substrates are not utilized.

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    Area of Science:

    • Biochemistry
    • Animal Science
    • Metabolic Regulation

    Background:

    • Mammary tissue's role in milk production is crucial for lactating cows.
    • Understanding gluconeogenesis in mammary tissue is key to optimizing milk synthesis.
    • Lactose synthesis relies on specific metabolic pathways within the mammary gland.

    Purpose of the Study:

    • To investigate the gluconeogenic capacity of lactating cow mammary tissue.
    • To determine the contribution of various substrates to glucose and lactose synthesis.
    • To assess the activity of key gluconeogenic enzymes in mammary tissue.

    Main Methods:

    • Incubation of mammary tissue slices with potential gluconeogenic substrates (alanine, glutamate, lactate, pyruvate, glycerol) and glucose.
    • Analysis of substrate incorporation into glucose and lactose.
    • Assay of key enzyme activities: glucose-6-phosphatase, pyruvate carboxylase, phosphoenolpyruvate carboxykinase, and fructose-1,6-diphosphatase.

    Main Results:

    • No gluconeogenic substrate was converted to glucose in mammary tissue.
    • Glucose was the primary carbon source for lactose synthesis; glycerol was also incorporated.
    • Activities of key gluconeogenic enzymes (except pyruvate carboxylase, PEPCK, FDPase) were significantly lower than in liver tissue.
    • Glucose-6-phosphatase activity was negligible in mammary tissue.

    Conclusions:

    • Lactating cow mammary tissue lacks significant gluconeogenic capacity.
    • The inability to synthesize glucose is linked to low glucose-6-phosphatase activity and limited substrate availability.
    • Lactose synthesis primarily utilizes circulating glucose, with glycerol as a minor contributor.

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