BMY-14802, a sigma ligand and potential antipsychotic drug, reverses amphetamine-induced changes in neostriatal single-unit activity in freely moving rats.

Abstract

The effects of BMY-14802 (5, 10, or 20 mg/kg), a sigma-receptor ligand showing preclinical evidence of antipsychotic efficacy, were tested on single-unit activity in the neostriatum of freely moving rats with or without pretreatment with 1.0 mg/kg D-amphetamine. Relative to resting baseline, amphetamine activated the large majority of neurons that changed firing rate in close temporal association with movement. All doses of BMY-14802 reversed this neuronal response, but the effect was most pronounced at 20 mg/kg. This dose, however, was equally likely to reverse or to induce a haloperidol-like potentiation of those neurons inhibited by amphetamine. In contrast, 10 mg/kg BMY-14802 consistently reversed amphetamine-induced neuronal inhibitions. All doses of BMY-14802 attenuated the locomotor effects of amphetamine, but only the higher doses also blocked other aspects of the amphetamine behavioral response. By itself, BMY-14802 dose dependently inhibited motor-related neurons, but elicited less behavioral activation than amphetamine. BMY-14802 (20 mg/kg) also induced hindlimb ataxia and occasional backwards locomotion. Haloperidol (1.0 mg/kg) reliably suppressed both behavior and neuronal activity when injected 30 min after BMY-14802, whether or not amphetamine pretreatment was given. Thus, BMY-14802 shares with other neuroleptics the capacity to reverse amphetamine-induced excitations of neostriatal motor-related neurons, whereas other effects of BMY-14802 reveal some haloperidol-like actions at 20 mg/kg that do not occur at lower doses.

• Authors: Z Wang, J L Haracz, G V Rebec
• Journal: Synapse (New York, N.Y.) (Synapse) Vol. 12 Issue 4 Pg. 312-21 (Dec 1992) ISSN: 0887-4476 [Print] United States
• PMID: 1361249 (Publication Type: Journal Article, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Antipsychotic Agents
• Ligands
• Pyrimidines
• Receptors, sigma
• alpha-(4-fluorophenyl)-4-(5-fluoro-2-pyrimidinyl)-1-piperazine butanol
• Amphetamine

Topics

• Amphetamine (antagonists & inhibitors, pharmacology)
• Animals
• Antipsychotic Agents (pharmacology)
• Behavior, Animal (drug effects)
• Corpus Striatum (cytology, drug effects, physiology)
• Electrophysiology
• Ligands
• Male
• Motor Activity
• Neurons (drug effects, physiology)
• Pyrimidines (pharmacology)
• Rats
• Rats, Sprague-Dawley
• Receptors, sigma (metabolism)