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Previous Article | Next Article
The Journal of Neuroscience, September 1, 1999, 19(17):7300-7308
The Insulin Receptor Tyrosine Kinase Substrate p58/53 and the Insulin Receptor Are Components of CNS Synapses
Mary-Alice Abbott1, 2, David G. Wells1, and Justin R. Fallon1 2 University of Massachusetts Graduate School of Biomedical Sciences, Worcester, Massachusetts 01655, and 1 Department of Neuroscience, Brown University, Providence, Rhode Island 02912
The synapse is the primary locus of cell-cell communication in the nervous system. It is now clear that the synapse incorporates diverse cell signaling modalities in addition to classical neurotransmission. Here we show that two components of the insulin pathway are localized at CNS synapses, where they are components of the postsynaptic density (PSD). An immunochemical screen revealed that polypeptides of 58 and 53 kDa (p58/53) were highly enriched in PSD fractions from rat cerebral cortex, hippocampus, and cerebellum. These polypeptides were purified and microsequenced, revealing that p58/53 is identical to the insulin receptor tyrosine kinase substrate p58/53 (IRSp53). Our analysis of IRSp58/53 mRNA suggests that within rat brain there is one coding region for IRSp58 and IRSp53; we find no evidence of alternative splicing. We demonstrate that IRSp58/53 is expressed in the synapse-rich molecular layer of the cerebellum and is highly concentrated at the synapses of cultured hippocampal neurons, where it co-localizes with the insulin receptor. Together, these data suggest that insulin signaling may play a role at CNS synapses.
Key words: insulin receptor; postsynaptic density; insulin receptor substrate; hippocampal neurons; brain; IRSp53
Copyright © 1999 Society for Neuroscience 0270-6474/99/19177300-09$05.00/0
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