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J Neurophysiol 66: 2150-2154, 1991;
0022-3077/91 $5.00
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Journal of Neurophysiology, Vol 66, Issue 6 2150-2154, Copyright © 1991 by APS

ARTICLES

Presynaptic transmitter release is specified by postsynaptic neurons of Aplysia buccal ganglia

D. Gardner
Department of Physiology and Biophysics, Cornell University Medical College, New York, New York 10021.

1. In Aplysia buccal ganglia, in which dual presynaptic neurons innervate multiple postsynaptic cells, strengths of the same identified synapses differ from animal to animal, consistent with developmental or plastic modulation. Synaptic strengths are specified by the postsynaptic neuron, so that synaptic current amplitudes are similar for inputs from different presynaptic cells converging on a postsynaptic cell but different for branches of the same neuron diverging onto different targets. 2. The coefficient of variation method of quantal analysis reveals that differences in synaptic strength, although specified postsynaptically, result partially from differences in the number of quanta released by presynaptic terminals. 3. This quantization is consistent with classical presynaptic models and suggests retrograde modulation of quantal release as postulated for hippocampal long-term potentiation.


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