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Maitotoxin, a Ca2+ channel activator candidate.

M Takahashi, Y Ohizumi, T Yasumoto

    The Journal of Biological Chemistry
    |July 10, 1982
    PubMed
    Summary

    Maitotoxin, a potent marine toxin, triggers calcium influx and neurotransmitter release in rat PC12h cells. This suggests maitotoxin activates voltage-dependent calcium channels, impacting cellular signaling.

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    Area of Science:

    • Neuroscience
    • Marine Biology
    • Toxicology

    Background:

    • Maitotoxin is the most potent marine toxin known.
    • Rat pheochromocytoma (PC12h) cells are a model for neuronal function.
    • Calcium influx is critical for neurotransmitter release.

    Purpose of the Study:

    • To investigate the cellular effects of maitotoxin on PC12h cells.
    • To determine the mechanism by which maitotoxin affects calcium levels and neurotransmitter release.

    Main Methods:

    • Exposure of PC12h cells to varying concentrations of maitotoxin.
    • Measurement of calcium (Ca2+) influx.
    • Assessment of [3H]norepinephrine release.
    • Testing the effects of tetrodotoxin, verapamil, manganese ions (Mn2+), and tetracaine.

    Main Results:

    • Low maitotoxin concentration (10(-8) g/ml) significantly increased Ca2+ influx in PC12h cells.
    • This influx led to Ca2+-dependent release of [3H]norepinephrine.
    • Maitotoxin's effects were independent of tetrodotoxin and external sodium (Na+).
    • Verapamil, Mn2+, and tetracaine inhibited or abolished maitotoxin's effects.

    Conclusions:

    • Maitotoxin activates voltage-dependent calcium channels in PC12h cells.
    • This activation leads to increased intracellular calcium and subsequent neurotransmitter release.
    • The findings provide insight into the neurotoxic mechanisms of maitotoxin.

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