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Ever since the initial measurements of presynaptic calcium currents it has been evident that calcium triggers transmitter release quite rapidly. Several models indicate, as did the initial voltage clamp measurements, that the calcium concentration triggering such release could be very high at the entry site and that this concentration should be very short lasting. In order to determine this time course,...
The time course for the calcium entry that triggers release was studied at the squid giant synapse by imaging light emission from n-aequorin-J intracellularly injected into the presynaptic terminal. The imaging utilized a video system capable of acquiring 4000 frames per second. The results indicate that the calcium entry triggered by action potentials reaches a peak within 200 microseconds and...
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