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Related Experiment Videos

Cellular binding sites for insulin in rat liver.

A Horvat, E Li, P G Katsoyannis

    Biochimica Et Biophysica Acta
    |April 8, 1975
    PubMed
    Summary

    Insulin binding sites in rat liver cells were investigated. Results suggest insulin may bind to intracellular membranes, not just the plasma membrane, impacting cellular understanding.

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    Area of Science:

    • Cell Biology
    • Biochemistry
    • Endocrinology

    Background:

    • Insulin is a key metabolic hormone.
    • Understanding insulin's cellular binding sites is crucial for its mechanism of action.
    • Previous studies focused primarily on plasma membrane binding.

    Purpose of the Study:

    • To investigate the subcellular distribution of insulin binding sites in rat liver.
    • To determine if insulin binds to intracellular membranes in addition to the plasma membrane.

    Main Methods:

    • Modified isolation of rat liver plasma membranes.
    • Differential centrifugation and discontinuous sucrose gradient separation.
    • Quantification of insulin binding capacity and enzyme marker (5'-nucleotidase) distribution.

    Main Results:

    • Insulin binding capacity did not consistently co-localize with the plasma membrane marker (5'-nucleotidase).
    • Significant insulin binding was found in denser cellular fractions than those rich in 5'-nucleotidase.
    • Linear sucrose gradients revealed density differences between insulin binding sites and plasma membrane particles.

    Conclusions:

    • Insulin binding is not exclusively localized to the plasma membrane in rat liver cells.
    • Evidence suggests the presence of insulin binding sites on intracellular membranes.
    • This finding may necessitate a re-evaluation of insulin's intracellular signaling pathways.

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