The mGluR5 antagonist MPEP selectively inhibits the onset and maintenance of ethanol self-administration in C57BL/6J mice
| Autor: | Jason P. Schroeder, Joyce Besheer, Amanda C. Sharko, Jennie R. Hillmann, Michael F. Miles, Clyde W. Hodge, Veronique Lepoutre, Rebekah A. Stevenson |
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| Rok vydání: | 2005 |
| Předmět: |
Male
Alcohol Drinking Pyridines Receptor Metabotropic Glutamate 5 Self Administration Pharmacology Motor Activity Receptors Metabotropic Glutamate Article chemistry.chemical_compound Mice Animals Ethanol Metabotropic glutamate receptor 5 musculoskeletal neural and ocular physiology Glutamate receptor Antagonist Central Nervous System Depressants Mice Inbred C57BL nervous system chemistry Metabotropic glutamate receptor Metabotropic glutamate receptor 1 Conditioning Operant Self-administration Psychology Neuroscience Excitatory Amino Acid Antagonists Reinforcement Psychology Ionotropic effect |
| Zdroj: | Psychopharmacology. 183(4) |
| ISSN: | 0033-3158 |
| Popis: | Many of the biochemical, physiological, and behavioral effects of ethanol are known to be mediated by ionotropic glutamate receptors. Emerging evidence implicates metabotropic glutamate receptors (mGluRs) in the biobehavioral effects of ethanol and other drugs of abuse, but there is little information regarding the role of mGluRs in the reinforcing effects of ethanol.Male C57BL/6J mice were trained to lever-press on a concurrent fixed ratio 1 schedule of ethanol (10% v/v) vs water reinforcement during 16-h sessions. Effects of mGluR1, mGluR2/3, and mGluR5 antagonists were then tested on parameters of ethanol self-administration behavior.The mGluR5 antagonist MPEP (1-10 mg/kg, i.p.) dose-dependently reduced ethanol-reinforced responding but had no effect on concurrent water-reinforced responding. Analysis of the temporal pattern of responding showed that MPEP reduced ethanol-reinforced responding during peak periods of behavior occurring during the early hours of the dark cycle. Further analysis showed that MPEP reduced the number of ethanol response bouts and bout-response rate. MPEP also produced a 13-fold delay in ethanol response onset (i.e., latency to the first response) with no corresponding effect on water response latency or locomotor activity. The mGluR1 antagonist CPCCOEt (1-10 mg/kg, i.p.) or the mGluR2/3 antagonist LY 341495 (1-30 mg/kg, i.p.) failed to alter ethanol- or water-reinforced responding.These data indicate that mGlu5 receptors selectively regulate the onset and maintenance of ethanol self-administration in a manner that is consistent with reduction in ethanol's reinforcement function. |
| Databáze: | OpenAIRE |
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