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Silent synapses in neural plasticity: current evidence.

H L Atwood¹, J M Wojtowicz

¹Department of Physiology, Medical Sciences Building, University of Toronto, Ontario, Canada.

Learning & Memory (Cold Spring Harbor, N.Y.)

|January 21, 2000

Summary

Silent synapses, which lack immediate physiological response, are common in neural circuits. Their activation is key to modifying neural pathways during development and aging.

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Area of Science:

Neuroscience
Synaptic Plasticity
Neural Circuitry

Background:

Silent synapses are structural specializations for neurotransmission lacking immediate postsynaptic response.
These synapses are prevalent in neural circuits and play a role in circuit modification.

Purpose of the Study:

To review the existence, mechanisms, and recruitment of silent synapses.
To explore the role of silent synapses in neural development, aging, and activity-dependent plasticity.

Main Methods:

Electrophysiological measurements
Optophysiological measurements
Review of proposed mechanisms for silent synapse formation and activation

Main Results:

Evidence supports the frequent occurrence of silent synapses in various nervous systems.
Silent synapses can transition to active states with stimulation, contributing to circuit plasticity.
Mechanisms include incomplete synapse assembly, presynaptic protein availability, and conditional postsynaptic receptor function.

Conclusions:

Silent synapses are dynamic entities that can be rapidly activated or silenced.
Their modulation is crucial for short-term and long-term synaptic plasticity, particularly during neural development.

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