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Methylamines and islet function: cationic aspects.

P Lebrun, R Gomis, M Deleers

    Journal of Endocrinological Investigation
    |August 1, 1984
    PubMed
    Summary
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    Methylamine inhibits insulin release from rat pancreatic islets by affecting cellular pH and calcium ion dynamics. These ionic effects explain its variable impact on insulin secretion depending on the stimulus.

    Area of Science:

    • Endocrinology
    • Molecular Biology
    • Cell Physiology

    Background:

    • Insulin secretion is a complex process regulated by various cellular signals.
    • Understanding the impact of exogenous compounds on insulin release is crucial for metabolic research.

    Purpose of the Study:

    • To investigate the effects of methylamine on insulin release from rat pancreatic islets.
    • To elucidate the underlying ionic mechanisms responsible for methylamine's action on insulin secretion.

    Main Methods:

    • Dose-response studies of methylamine on insulin release evoked by secretagogues.
    • Measurement of 45Ca uptake/efflux and 86Rb outflow to assess ionic fluxes.
    • Determination of intracellular pH changes induced by methylamine.

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    Main Results:

    • Methylamine (2-10 mM) dose-dependently inhibited glucose- and leucine-stimulated insulin release.
    • Methylamine increased cellular pH and altered potassium and calcium ion handling.
    • Methylamine's inhibitory effect was distal to initial K+ depolarization but affected Ca2+ influx.

    Conclusions:

    • Methylamine inhibits insulin secretion through multiple ionic mechanisms, including altered cellular pH and calcium homeostasis.
    • The complex ionic effects of methylamine contribute to its variable impact on insulin secretion depending on the specific secretagogue.