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| Content Provider | PubMed Central |
|---|---|
| Author | Simmonds, M. A. |
| Abstract | 1 Interactions of depressant and anticonvulsant drugs with the neuronal gamma-aminobutyric acid (GABA) receptor + effector system have been examined on afferent fibres to the rat cuneate nucleus in vitro. Three types of interaction have been measured: (a) potentiation of depolarizing responses to the GABA analogue, muscimol: (b) reduction in the potency of bicuculline as an antagonist of muscimol at the GABA receptor: (c) reduction in the potency of picrotoxin as an antagonist of muscimol acting on the effector mechanism. 2 Phenobarbitone reduced the potency of picrotoxin in doses which did not affect the potency of bicuculline and which caused only a small potentiation of muscimol. Pentobarbitone did not show such selectivity, a reduction in potency of picrotoxin always being accompanied by a reduction in potency of bicuculline and a substantial potentiation of muscimol. 3 Flurazepam and lorazepam both reduced the potency of picrotoxin without affecting that of bicuculline and with very little potentiation of muscimol. Phenytoin had no effect on the potency of picrotoxin whilst potentiating muscimol to the same extent as phenobarbitone. 4 The spectrum of drug activity in reducing the potency of picrotoxin correlates well with the reported anticonvulsant effects of these drugs against kindled amygdaloid seizures. Potentiation of muscimol and reduction of bicuculline potency appear more closely related to hypnotic properties. |
| Starting Page | 739 |
| File Format | |
| ISSN | 00071188 |
| Journal | British Journal of Pharmacology |
| Issue Number | 3 |
| Volume Number | 73 |
| Language | English |
| Publisher | Nature Publishing Group |
| Publisher Date | 1981-07-01 |
| Access Restriction | Open |
| Rights Holder | Nature Publishing Group |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology |
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