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Related Experiment Videos

Sodium-dependent, calmodulin-dependent transmitter release from synaptosomes.

M E Sandoval, G Aquino, J L Chávez

    Neuroscience Letters
    |May 23, 1985
    PubMed
    Summary

    This study shows that trifluoperazine (TFP) inhibits the release of neurotransmitters like gamma-amino[2,3-3H]butyric acid ([3H]GABA) and [3H]dopamine ([3H]DA) by blocking calmodulin-dependent pathways. This suggests calmodulin mediates transmitter release.

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    Area of Science:

    • Neuroscience
    • Neurochemistry
    • Molecular Biology

    Background:

    • Neurotransmitter release is crucial for synaptic communication.
    • Calmodulin plays a role in various cellular processes, including calcium signaling.
    • Gamma-amino[2,3-3H]butyric acid ([3H]GABA) and [3H]dopamine ([3H]DA) are key neurotransmitters.

    Purpose of the Study:

    • To investigate the role of calmodulin in neurotransmitter release from caudate synaptosomes.
    • To determine if calmodulin mediates GABA and dopamine release induced by sodium or calcium influx.

    Main Methods:

    • Utilized sodium-ionophore monensin to enhance baseline efflux of [3H]GABA and [3H]DA.
    • Employed trifluoperazine (TFP), a calmodulin antagonist, to assess its inhibitory effects.
    • Investigated calcium-dependent release using calcium-ionophore A23187.

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    Main Results:

    • Monensin significantly enhanced the release of [3H]GABA and [3H]DA.
    • TFP markedly inhibited monensin-stimulated transmitter release.
    • TFP also reduced depolarization- and A23187-induced [3H]GABA release, independent of calcium flux.

    Conclusions:

    • Calmodulin-dependent processes appear to mediate neurotransmitter release.
    • Both increased intraterminal sodium and calcium entry may involve calmodulin in regulating transmitter release.