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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Linden, D. J. |
| Description | Author Affiliation: Linden DJ ( Department of Neuroscience, Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205, USA. dlinden@jhmi.edu); |
| Abstract | Cerebellar long-term synaptic depression (LTD) is a model system of neuronal information storage that is expressed postsynaptically as a functional down-regulation of alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors. What properties of postsynaptic AMPA receptors are changed? Several lines of evidence argue against changes in AMPA-receptor kinetics. Neither LTD evoked in cultured granule-cell Purkinje cell (PC) pairs nor an LTD-like phenomenon evoked by phorbol ester application was associated with alterations in evoked AMPA receptor-mediated excitatory post-synaptic current (EPSC) or mEPSC kinetics. LTD produced by pairing glutamate pulses with depolarization was not altered by prior application of the desensitization-reducing compound cyclothiazide. Finally, rapid application of glutamate to lifted PCs revealed no significant alterations in AMPA-receptor kinetic properties after LTD induction. When this system was used to apply varying concentrations of glutamate, no alteration in AMPA-receptor glutamate affinity was seen after LTD induction. Finally, peak-scaled nonstationary fluctuation analysis was applied to estimate AMPA-receptor unitary conductance before and after LTD induction in a cultured cell pair, and this analysis too revealed no significant change. These results suggest that cerebellar LTD may be expressed solely as a reduction in the number of functional AMPA receptors in the postsynaptic density [Wang, Y.-T. & Linden, D. J. (2000) Neuron 25, 635-664]. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 24 |
| Volume Number | 98 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2001-11-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cerebellum Metabolism Excitatory Postsynaptic Potentials Physiology Long-Term Potentiation Receptors, AMPA 2-Amino-5-phosphonovalerate Pharmacology Animals Benzothiadiazines Cells, Cultured Cytology Electrophysiology Excitatory Amino Acid Antagonists Drug Effects Glutamic Acid Mice Phorbol Esters Quinoxalines Agonists Antagonists & Inhibitors Receptors, N-Methyl-D-Aspartate Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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