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Science 12 June 1992:
Vol. 256. no. 5063, pp. 1570 - 1573
DOI: 10.1126/science.1317971
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Articles

Science, Vol 256, Issue 5063, 1570-1573
Copyright © 1992 by American Association for the Advancement of Science

articles

Hebbian depression of isolated neuromuscular synapses in vitro

Y Dan and MM Poo

Department of Biological Sciences, Columbia University, New York, NY 10027.

Modulation of synaptic efficacy may depend on the temporal correlation between pre- and postsynaptic activities. At isolated neuromuscular synapses in culture, repetitive postsynaptic application of acetylcholine pulses alone or in the presence of asynchronous presynaptic activity resulted in immediate and persistent synaptic depression, whereas synchronous pre- and postsynaptic coactivation had no effect. This synaptic depression was a result of a reduction of evoked transmitter release, but induction of the depression requires a rise in postsynaptic cytosolic calcium concentration. Thus, Hebbian modulation operates at isolated peripheral synapses in vitro, and transsynaptic retrograde interaction appears to be an underlying mechanism.


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