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Previous Article | Next Article
The Journal of Neuroscience, July 15, 1998, 18(14):5517-5528
Glutamate Receptor Targeting to Synaptic Populations on Purkinje Cells Is Developmentally Regulated
Hui-Min Zhao, Robert J. Wenthold, and Ronald S. Petralia National Institute on Deafness and Other Communication Disorders/National Institutes of Health, Bethesda, Maryland 20892
Selective targeting of neurotransmitter receptors to specific synapse populations occurs in adult neurons, but little is known about the development of these receptor distribution patterns. In this study, we demonstrate that a specific developmental switch occurs in the targeting of a receptor to an identified synapse population. Localization of delta and AMPA glutamate receptors at parallel and climbing fiber synapses on the developing Purkinje cells was studied using postembedding immunogold. Delta receptors were found to be abundant on postsynaptic membranes at parallel fiber synapses from postnatal day 10 (P10) to adult. In contrast, delta receptors were found to be high at climbing fiber synapses only at P10 and P14. Thus, a major finding of this paper is that high levels of delta receptors are transiently expressed in climbing fiber synapses in the second postnatal week. Labeling of synapses with anti-delta receptor antibody at P10 was limited to the postsynaptic membrane of excitatory synapses and was absent from GABAergic synapses. Unlike delta receptor immunolabeling, AMPA receptor immunolabeling (GluR2/3 and GluR2 antibodies) was high in the postsynaptic membranes of synapses at early postnatal ages (P2 and P5) and was higher in climbing fiber synapses than in parallel fiber synapses from P10 to adult. The present study shows that synapse-specific targeting of glutamate receptors in Purkinje cells is developmentally regulated, with the postsynaptic receptor composition established during synapse maturation. This composition is not dependent on the nature of the initial establishment of synaptic connections.
Key words: AMPA; cerebellum; climbing fiber; delta; parallel fiber; synaptogenesis
Copyright © 1998 Society for Neuroscience 0270-6474/98/18145517-12$05.00/0
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