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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kato, N. |
| Description | Author Affiliation: Kato N ( Department of Integrative Brain Science, Faculty of Medicine, Kyoto University, Japan.); |
| Abstract | Long-term depression (LTD) is held relevant to memory and learning. Its induction is known to require postsynaptic calcium increases. However, the source of these calcium increases remains unclear. In visual cortex slices, LTD was induced by tetanization after blockade of N-methyl-D-aspartate (NMDA) and non-NMDA ionotropic glutamate receptors. LTD induced under this condition was prevented by an intracellular injection of each of the following drugs into the postsynaptic neuron: (i) guanosine 5'-[beta-thio]diphosphate, which competitively inhibits the binding of GTP to GTP-binding regulatory proteins; (ii) heparin, which antagonizes 1,4,5-inositol triphosphate binding; and (iii) calcium chelators. Moreover, LTD was induced without tetanization by applying quisqualate (10 microM), a metabotropic glutamate receptor agonist, but not another agonist, trans-aminocyclopentane-1,3-dicarboxylic acid (10 microM). Together, these results suggest that activation of 1,4,5-inositol trisphosphate-linked subtypes of metabotropic glutamate receptor is responsible for the increase in postsynaptic calcium concentration, which results in homosynaptic LTD. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 8 |
| Volume Number | 90 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1993-05-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Neuronal Plasticity Physiology Neurons Quisqualic Acid Pharmacology Receptors, Glutamate Synapses Visual Cortex 2-Amino-5-phosphonovalerate 6-Cyano-7-nitroquinoxaline-2,3-dione Amino Acids Animals Anticonvulsants Bicuculline Cyclopentanes Evoked Potentials Drug Effects Guanosine Diphosphate Analogs & Derivatives Heparin In Vitro Techniques Kinetics Quinoxalines Thionucleotides Gamma-Aminobutyric Acid Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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