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Related Experiment Videos

Glycogen synthesis by rat hepatocytes.

J Katz, S Golden, P A Wals

    The Biochemical Journal
    |May 15, 1979
    PubMed
    Summary

    Hepatocytes synthesize glycogen from glucose and gluconeogenic precursors. Glycogen synthesis rates increase with glucose concentration, while phosphorylase activity decreases, indicating distinct regulatory mechanisms.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Metabolic Regulation

    Background:

    • Hepatocytes play a crucial role in glucose homeostasis by synthesizing and storing glycogen.
    • Understanding the regulation of glycogen synthesis and breakdown is essential for metabolic research.

    Purpose of the Study:

    • To investigate the rates and mechanisms of glycogen synthesis in hepatocytes using various substrates.
    • To examine the activity of key enzymes, glycogen synthase and phosphorylase, during glycogen synthesis.

    Main Methods:

    • Hepatocytes from starved or fed rats were incubated with glucose or gluconeogenic precursors.
    • Glycogen synthesis and 14C incorporation were measured.
    • Activities of glycogen synthase and phosphorylase were assayed under different conditions.

    Main Results:

    • Hepatocytes efficiently synthesized glycogen from glucose and gluconeogenic substrates.
    • Glycogen synthesis rates increased with glucose concentration, with maximal rates observed at 50-60mM.
    • Glycogen synthase activity increased in parallel with glycogen synthesis, while phosphorylase activity generally declined, particularly with increasing glucose concentrations.

    Conclusions:

    • Hepatocytes exhibit robust glycogen synthesis capacity from diverse substrates.
    • Glycogen synthesis is tightly regulated by the interplay of glycogen synthase and phosphorylase activities.
    • Phosphorylase activity does not appear to limit net glycogen synthesis, even when active enzyme levels are high.

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