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Evidence for possible interrelationship between gluconeogenesis and ketogenesis?

L Kümmel

    Biochemistry International
    |March 1, 1984
    PubMed
    Summary
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    Mitochondrial pyruvate carrier--a possible link between gluconeogenesis and ketogenesis in the liver.

    Bioscience reports·1987

    Ketogenic substrates like 3-hydroxybutyrate significantly impact gluconeogenesis in rat hepatocytes, affecting glucose production from lactate and serine. Acetoacetate, however, inhibited these effects, suggesting complex metabolic regulation.

    Area of Science:

    • Biochemistry
    • Cellular Metabolism

    Background:

    • Gluconeogenesis is a vital metabolic pathway for maintaining blood glucose homeostasis.
    • Ketogenic substrates play a role in cellular energy metabolism and can influence gluconeogenesis.

    Purpose of the Study:

    • To investigate the effects of specific ketogenic substrates on gluconeogenesis in rat hepatocytes.
    • To elucidate the role of 3-hydroxybutyrate and acetoacetate in regulating glucose production.

    Main Methods:

    • Primary rat hepatocytes were isolated and incubated with various substrates.
    • Gluconeogenesis rates were measured using radiolabeled precursors.
    • The effects of D,L-3-hydroxybutyrate, acetate, acetoacetate, and oleate were assessed.

    Main Results:

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    • D,L-3-Hydroxybutyrate (5 mM) stimulated gluconeogenesis from lactate (41%) and serine (70%).
    • Acetate showed similar stimulation from lactate (43%) but less from serine (35%).
    • Acetoacetate inhibited the stimulatory effects of other substrates, and no effect was observed on pyruvate gluconeogenesis.

    Conclusions:

    • Ketogenic substrates differentially regulate gluconeogenesis from various precursors in rat hepatocytes.
    • Acetoacetate may play an inhibitory role, potentially through mitochondrial transport mechanisms.
    • The findings suggest a physiological mechanism involving pyruvate transport and intramitochondrial acetoacetate.