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- Title
GluN2B-Containing NMDA Receptors Promote Glutamate Synapse Development in Hippocampal Interneurons.
- Authors
Kelsch, Wolfgang; Zhijun Li; Wieland, Sebastian; Senkov, Oleg; Herb, Anne; Göngrich, Christina; Monyer, Hannah
- Abstract
In postnatal development, GluN2B-containing NMDARs are critical for the functional maturation of glutamatergic synapses. GluN2B-containing NMDARs prevail until the second postnatal week when GluN2A subunits are progressively added, conferring mature properties to NMDARs. In corticalprincipal neurons, deletion of GluN2B results in an increase in functional AMPAR synapses, suggesting that GluN2B-containing NMDARs set a brake on glutamate synapse maturation. The function of GluN2B in the maturation of glutamatergic inputs to cortical interneurons is not known. To examine the function of GluN2B in interneurons, we generated mutant mice with conditional deletion of GluN2B in interneurons (GluN2B△GAD67 GluN2B△GAD67 mice interneurons distributed normally in cortical brain regions. After the second postnatal week, GluN2B△GAD67 mice developed hippocampal seizures and died shortly thereafter. Before the onset of seizures, GluN2B-deficient hippocampal interneurons received fewer glutamatergic synaptic inputs than littermate controls, indicating that GluN2B-containing NMDARs positively regulate the maturation of glutamatergic input synapses in interneurons. These findings suggest that GluN2B-containing NMDARs keep the circuit activity under control by promoting the maturation of excitatory synapses in interneurons.
- Subjects
NEUROSCIENCES; METHYL aspartate receptors; POSTNATAL development in animals; DEVELOPMENTAL biology; NEURONS; EXCITATORY amino acid agents
- Publication
Journal of Neuroscience, 2014, Vol 34, Issue 48, p16022
- ISSN
0270-6474
- Publication type
Article
- DOI
10.1523/JNEUROSCI.1210-14.2014