Abstract
In glutamatergic synapses, glutamate receptors (GluRs) associate with many other proteins involved in scaffolding and signal transduction. The ontogeny of these postsynaptic density (PSD) proteins involves changes in their composition during development, paralleling changes in GluR type and function. In the CA1 region of the hippocampus, at postnatal day 2 (P2), many synapses already have a distinct PSD. We used immunoblot analysis, subcellular fractionation, and quantitative immunogold electron microscopy to examine the distribution of PSD proteins during development of the hippocampus. Synapses at P2 contained substantial levels of NR1 and NR2B and most GluR-associated proteins, including SAP102, SynGAP, the chain of proteins from GluRs/SAP102 through GKAP/Shank/Homer and metabotropic glutamate receptors, and the adhesion factors, cadherin, catenin, neuroligin, and Nr-CAM. Development was marked by substantial decreases in NR2B and SAP102 and increases in NR2A, PSD-95, AMPA receptors, and CaMKII. Other components showed more moderate changes.
MeSH terms
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Animals
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Animals, Newborn
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Calcium-Calmodulin-Dependent Protein Kinase Type 2
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Calcium-Calmodulin-Dependent Protein Kinases / metabolism
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Carrier Proteins / metabolism
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Cell Differentiation / physiology
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Disks Large Homolog 4 Protein
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Glutamic Acid / metabolism
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Hippocampus / growth & development
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Hippocampus / metabolism*
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Hippocampus / ultrastructure
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Homer Scaffolding Proteins
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Immunohistochemistry
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Intracellular Signaling Peptides and Proteins
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Membrane Proteins / metabolism*
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Microscopy, Electron, Transmission
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Nerve Tissue Proteins / metabolism*
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Neurons / metabolism*
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Neurons / ultrastructure
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Neuropeptides / metabolism
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Rats
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Receptors, AMPA / metabolism
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Receptors, Glutamate / metabolism*
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Receptors, N-Methyl-D-Aspartate / metabolism
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Synaptic Membranes / metabolism*
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Synaptic Membranes / ultrastructure
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Synaptic Transmission / physiology
Substances
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Carrier Proteins
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Disks Large Homolog 4 Protein
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Dlg3 protein, rat
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Dlg4 protein, rat
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Homer Scaffolding Proteins
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Intracellular Signaling Peptides and Proteins
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Membrane Proteins
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NR2A NMDA receptor
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NR2B NMDA receptor
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Nerve Tissue Proteins
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Neuropeptides
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Receptors, AMPA
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Receptors, Glutamate
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Receptors, N-Methyl-D-Aspartate
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postsynaptic density proteins
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Glutamic Acid
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Calcium-Calmodulin-Dependent Protein Kinase Type 2
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Calcium-Calmodulin-Dependent Protein Kinases