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    Presynaptic potentials and facilitation of transmitter release in the squid giant synapse

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    Bittner_JGP_1978_2.pdf (1.274Mb)
    Date
    1978-10-01
    Author
    Charlton, Milton P.
    Bittner, George D.
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    Abstract
    Presynaptic potentials were studied during facilitation of transmitter release in the squid giant synapse. Changes in action potentials were found to cause some, but not all, of the facilitation during twin-pulse stimulation. During trains of action potentials, there were no progressive changes in presynaptic action potentials which could account for the growth of facilitation. Facilitation could still be detected in terminals which had undergone conditioning depolarization or hyperpolarization. Facilitation could be produced by small action potentials in low [Ca++]o and by small depolarizations in the presence of tetrodotoxin. Although the production of facilitation varied somewhat with presynaptic depolarization, nevertheless, approximately equal amounts of facilitation could be produced by depolarizations which caused the release of very different amounts of transmitter.
    Department
    Neuroscience
    Subject
    presynaptic potentials
    squid giant synapse
    URI
    http://hdl.handle.net/2152/37845
    Citation
    M.P. Charlton and G.D. Bittner. 1978. Presynaptic potentials and facilitation of transmitter release in the squid giant synapse. J. Gen. Physiol. 72:487 511.
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