Journal
NEURON
Volume 63, Issue 3, Pages 342-356Publisher
CELL PRESS
DOI: 10.1016/j.neuron.2009.06.016
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Funding
- NARSAD
- Marie Curie International Program
- CIMA
- Spanish Ministry of Education and Science [SAF2006-10025, CSD2008-00005, BFU2006-01896]
- Fondo de Investigaciones Sanitarias [PI060103]
- Helen Lyng White
- NICHD [T32-HD40127]
- NIH
- National Institute of Neurological Disorders and Stroke
- Div Of Biological Infrastructure
- Direct For Biological Sciences [0755219] Funding Source: National Science Foundation
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NR3A is the only NMDA receptor (NMDAR) subunit that downregulates sharply prior to the onset of sensitive periods for plasticity, yet the functional importance of this transient expression remains unknown. To investigate whether removal/replacement of juvenile NR3A-containing NMDARs is involved in experience-driven synapse maturation, we used a reversible transgenic system that prolonged NR3A expression in the forebrain. We found that removal of NR3A is required to develop strong NMDAR currents, full expression of long-term synaptic plasticity, a mature synaptic organization characterized by more synapses and larger postsynaptic densities, and the ability to form long-term memories. Deficits associated with prolonged NR3A were reversible, as late-onset suppression of transgene expression rescued both synaptic and memory impairments. Our results suggest that NR3A behaves as a molecular brake to prevent the premature strengthening and stabilization of excitatory synapses and that NR3A removal might thereby initiate critical stages of synapse maturation during early postnatal neural development.
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