The Journal of General Physiology
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*CALCIUM, ELEMENTAL
*TETRODOTOXIN
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The Journal of General Physiology, Vol 72, 487-511, Copyright © 1978 by The Rockefeller University Press

ARTICLES

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

MP Charlton and GD Bittner

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.
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