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Insulin secretion and action.

J N Fain

    Metabolism: Clinical and Experimental
    |July 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Pertussis toxin impacts pancreatic insulin release by affecting an inhibitory protein. This research explores the complex signaling pathways involved in insulin secretion and cellular metabolism.

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    Area of Science:

    • Endocrinology
    • Molecular Biology
    • Cellular Metabolism

    Background:

    • Insulin secretion is regulated by complex signaling pathways.
    • Alpha 2 adrenoceptor activation normally inhibits insulin release.
    • Pertussis toxin affects guanine nucleotide-binding proteins involved in cellular signaling.

    Purpose of the Study:

    • To investigate the role of pertussis toxin in modulating alpha 2 adrenoceptor-mediated inhibition of insulin release.
    • To elucidate the signaling mechanisms underlying insulin secretion and its metabolic effects.

    Main Methods:

    • Utilized pertussis toxin to study its effect on pancreatic insulin release.
    • Investigated the involvement of inhibitory guanine nucleotide-binding proteins (Ni) and adenylate cyclase.

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  • Examined the impact of insulin receptor activation on tyrosine protein kinase activity and downstream signaling.

    • Main Results:

    • Pertussis toxin abolishes the inhibitory effect of alpha 2 adrenoceptor activation on insulin release.
    • Pertussis toxin ADP-ribosylates an inhibitory guanine nucleotide-binding protein (Ni).
    • Epinephrine-induced decrease in cyclic adenosine monophosphate (AMP) may inhibit insulin release; insulin activates receptor tyrosine kinase and AMP-independent protein kinase.

    Conclusions:

    • Pertussis toxin disrupts inhibitory signaling pathways affecting insulin secretion.
    • Insulin's effects involve multiple second messengers and affect membrane-bound enzyme activity.
    • Further research is needed to establish the relative importance of these insulin effects in metabolic regulation.