Abstract
1. The involvement of the haloperidol-sensitive, sigma recognition site and the N-methyl-D-aspartic acid (NMDA) receptor in the mediation of the discriminative stimulus properties of (+)-N-allylnormetazocine [+)-NANM, (+)-SKF 10,047), has been investigated in the rat by use of a two-lever, operant drug discrimination paradigm. 2. Six compounds with nanamolar affinity for the sigma recognition site [+/-)-pentazocine, (+)-3-(hydroxyphenyl)-N-propylpiperidine [+)-3-PPP), ditolylguanidine (DTG), haloperidol, (-)-butaclamol and BMY 14802) were investigated for their ability to generalise or antagonise the (+)-NANM discriminative stimulus. Each drug was tested at doses found in an ex vivo radioligand binding assay to displace [3H]-DTG from the central sigma recognition site by more than 40%. 3. While (+/-)-pentazocine (in the presence of naloxone) generalised and (+)-3-PPP partially antagonised the (+)-NANM cue, the other putative sigma ligands were ineffective either as agonists or antagonists at doses clearly occupying the sigma site in vivo. 4. Dose-dependent generalisation to the (+)-NANM cue was seen with the selective non-competitive NMDA receptor antagonist, MK-801, a compound devoid of significant affinity for the sigma recognition site. 5. (+/-)-Pentazocine was found to antagonise seizures induced in the mouse by NMDLA, a model reflecting antagonism of central NMDA receptors, and a strong correlation was found between the rank order of potency of compounds to generalise to the (+)-NANM discriminative stimulus and their potencies as anticonvulsants.(ABSTRACT TRUNCATED AT 250 WORDS)
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