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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Matus, A. Fagg, G. E. |
| Abstract | Recognition sites for the excitatory neurotransmitter, L-glutamate, were studied in synaptic plasma membranes and postsynaptic densities (PSDs) isolated from rat brains. The results demonstrate (i) that L-glutamate binding sites may be resolved into three distinct subtypes (categories A1, A2, and A4), each corresponding to an electrophysiologically identified receptor class, and (ii) that the N-methyl aspartate (A1) and quisqualate (A2) receptor types are selectively associated with PSDs. L-[3H]Glutamate bound to an apparently homogeneous population of sites in PSDs with a Kd of 3.39 X 10(-7) M and a Bmax (maximum number of binding sites) of 6.1 pmol/mg of protein. Inhibition studies demonstrated that these sites could be resolved into two distinct subtypes. N-Methyl aspartate maximally inhibited 58% of PSD-located L-glutamate binding sites with a Ki of 7.2 X 10(-6) M (the A1 site), and quisqualate inhibited 42% with a Ki of 1.1 X 10(-6) M (the A2 site); the effects of both substances were additive. Experiments with a range of acidic amino acid analogues indicated that the ligand selectivities of these two binding sites conformed to those of the N-methyl D-aspartate and quisqualate receptor classes defined electrophysiologically. The Cl--dependent population of L-glutamate binding sites (the A4 site), which predominates in synaptic membranes, was absent from isolated PSDs. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 21 |
| Volume Number | 81 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1984-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Aspartic Acid Analogs & Derivatives Brain Metabolism Oxadiazoles Receptors, Neurotransmitter Synapses Synaptic Membranes Amino Acids Pharmacology Animals Chlorides Glutamates Glutamic Acid Kinetics N-Methylaspartate Quisqualic Acid Receptors, Glutamate Drug Effects Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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