The serotonin (5-HT) system is involved in pain modulation, and 5-HT receptor agonists can enhance antinociceptive effects of mu opioid receptor agonists. Less is known about the actions of 5-HT receptor agonists on other effects of opioids. This study examined the effects of non-contingent and contingent administration of the 5-HT(2A) receptor agonists DOM and quipazine on i.v. heroin...
Although many drugs act by indirectly stimulating multiple receptors (e.g., reuptake inhibitors), relatively little is known about interactions between agonism at different receptors. This study compared the effect of serotonin (5-HT)(1A) receptor agonists with the discriminative stimulus effects of the 5-HT(2A) receptor agonist 1-(2,5-dimethoxy-4-methylphenyl)-2-aminopropane (DOM) in rats and...
Very little is known about constitutive activity in vivo. This study examined whether constitutive activity and inverse agonism contribute to discriminative stimulus effects of drugs acting at serotonin (5-HT)(2A) receptors. Rats were trained to discriminate between saline and either 0.56 mg/kg 5-HT(2) receptor agonist 1-(2,5-dimethoxy-4-methylphenyl)-2-aminopropane (DOM), 1.0 mg/kg 5-HT(2A)...
Discriminative stimulus effects of the serotonin (5-HT) receptor agonist 1-(2,5-dimethoxy-4-methylphenyl)-2-aminopropane (DOM) have been studied in rats and, more recently, in rhesus monkeys. This study examined DOM, 2,5-dimethoxy-4-(n)-propylthiophenethylamine (2C-T-7), and dipropyltryptamine hydrochloride (DPT) alone and in combination with three antagonists, MDL100907...
Opioid receptor agonists can enhance some effects of cannabinoid receptor agonists, and cannabinoid receptor agonists can enhance some effects of opioid receptor agonists; however, the generality of these interactions is not established. This study examined interactions between the discriminative stimulus and antinociceptive effects of mu opioid receptor agonists and...
AL-38022A is a novel synthetic serotonergic (5-HT) ligand that exhibited high affinity for each of the 5-HT2 receptor subtypes (Ki100-fold less) affinity for other 5-HT receptors. In addition, AL-38022A displayed a very low affinity for a broad array of other receptors, neurotransmitter transport sites, ion channels, and second messenger elements, making it a relatively selective agent....
Discriminative stimulus effects of 1-(2,5-dimethoxy-4-methylphenyl)-2-aminopropane (DOM) and related drugs have been studied extensively in rodents, although the generality of those findings across species is not known. The goals of this study were to see whether monkeys could discriminate DOM and to characterize the DOM discriminative stimulus by studying a variety of drugs, including those...