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Graded synaptic transmission between spiking neurons.

K Graubard, J A Raper, D K Hartline

    Proceedings of the National Academy of Sciences of the United States of America
    |June 1, 1980
    PubMed
    Summary

    Neurons in the lobster stomatogastric ganglion exhibit graded synaptic transmission. This spikeless transmission, modulated by presynaptic input, releases significant transmitter amounts below action potential threshold.

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    Area of Science:

    • Neuroscience
    • Synaptic Transmission
    • Crustacean Nervous System

    Background:

    • Spiking neurons in the lobster stomatogastric ganglion are known to communicate via synaptic transmission.
    • Traditional synaptic transmission relies on action potentials to trigger neurotransmitter release.

    Purpose of the Study:

    • To investigate the phenomenon of graded synaptic transmission in the lobster stomatogastric ganglion.
    • To characterize the properties and modulation of spikeless postsynaptic potentials.

    Main Methods:

    • Electrophysiological recordings from identified neurons in the lobster stomatogastric ganglion.
    • Voltage-clamp and current-clamp techniques to analyze synaptic potentials.
    • Modulation of presynaptic input to assess its effect on synaptic transmission.

    Main Results:

    • Neurons release functionally significant amounts of neurotransmitter below the action potential threshold.
    • Spikeless postsynaptic potentials exhibit graded amplitude that correlates with presynaptic voltage.
    • These graded potentials can be sustained for extended durations.
    • Synaptic input to the presynaptic neuron modulates the graded synaptic transmission.

    Conclusions:

    • Graded synaptic transmission is a significant mode of communication between neurons in the stomatogastric ganglion.
    • This spikeless transmission mechanism offers a way to fine-tune neural circuit function.
    • The modulation of graded transmission by presynaptic input adds another layer of complexity to neural circuit control.

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