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Synaptic changes in frog brain after stimulation with potassium chloride.

A V Harreveld, J Trubatch

    Journal of Neurocytology
    |February 1, 1975
    PubMed
    Summary

    Potassium chloride (KCl) stimulation alters frog brain synapses, causing synaptic vesicle fusion and a more developed postsynaptic web. These changes indicate dynamic synaptic responses to neuronal excitation.

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    Area of Science:

    • Neuroscience
    • Cell Biology
    • Electron Microscopy

    Background:

    • Understanding synaptic plasticity is crucial for neuroscience.
    • Frog brains offer a viable in vitro model for studying neuronal function.
    • Synaptic vesicle dynamics and postsynaptic structures are key indicators of neural activity.

    Purpose of the Study:

    • To investigate the ultrastructural changes in frog brain synapses following stimulation.
    • To characterize the effects of potassium chloride (KCl) on synaptic morphology.
    • To compare stimulated synapses with control preparations.

    Main Methods:

    • In vitro frog brain preparations.
    • Stimulation using potassium chloride (KCl).
    • Freeze substitution fixation.
    • Electron microscopy examination.
    • Control preparations in calcium-free solution or cooled solution.

    Main Results:

    • KCl stimulation induced synaptic vesicle fusion with the presynaptic membrane.
    • A pronounced postsynaptic web was observed in stimulated synapses.
    • Synaptic vesicle behavior varied, with some retreating but remaining attached.
    • The synaptic gap width became less uniform after KCl stimulation.
    • Reduced extracellular space and membrane invaginations were noted.

    Conclusions:

    • KCl stimulation triggers significant morphological alterations at the synapse.
    • These alterations suggest active processes involved in synaptic transmission and plasticity.
    • The frog brain in vitro model is suitable for studying stimulus-induced synaptic changes.

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