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Updated: Jul 6, 2026

Presynaptically Silent Synapses Studied with Light Microscopy
Published on: January 4, 2010
NMDA receptors inhibit synapse unsilencing during brain development
Hillel Adesnik1, Guangnan Li, Matthew J During
1Departments of Cellular and Molecular Pharmacology, Physiology, and Neurology, University of California, San Francisco, CA 94143, USA.
Deleting NMDA receptors surprisingly increases functional synapses in the brain. This challenges the idea that these receptors are essential for synapse development, suggesting a new model for neural circuit wiring.
Area of Science:
- Neuroscience
- Synaptic Plasticity
- Molecular Biology
Background:
- Synapse specification is crucial for brain function.
- NMDA receptors are thought to mediate experience-driven circuit wiring.
- The role of NMDA receptors in early synaptogenesis is debated.
Purpose of the Study:
- To investigate the role of NMDA receptors in excitatory synapse maturation.
- To test the prevailing model of activity-dependent synapse formation.
- To elucidate the mechanisms underlying synapse development.
Main Methods:
- Genetic ablation of NMDA receptors in vitro and in vivo.
- Electrophysiological recordings to assess synaptic function.
- Analysis of neuronal morphology.
Main Results:
- NMDA receptor deletion significantly increased functional synapse number.
- Reintroducing NMDA receptors decreased functional inputs.
- NMDA receptor deletion enhanced unitary connection strength without altering morphology.
Conclusions:
- Basal NMDA receptor activity may inhibit synapse maturation.
- A new model proposes NMDA receptors prevent premature synapse maturation.
- Only punctuated activity bursts induce functional synapses for neural circuitry wiring.
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