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The 5-HT2A and 5-HT2C antagonists MDL 100,907 and SER-082 were tested with the 5-HT2A/C agonist DOI and the 5-HT1A/2A/2C agonist LSD in the Behavioral Pattern Monitor, which provides multiple measures of locomotor and investigatory activity. Previous investigations have shown that these measures load onto three independent behavioral factors: amount of activity, exploratory behavior, and behavioral organization. Rats pretreated with saline, MDL 100,907 (0.25-2.0 mg/kg), or SER-082 (0.5-1.0 mg/kg) were treated with saline, 0.25 mg/kg DOI, or 60 micrograms/kg LSD. All effects of DOI were blocked by all doses of MDL 100,907, but only by the highest dose of SER-082. While the effects of LSD on activity and exploratory behavior were largely unaffected, either pretreatment antagonized the effects of LSD on behavioral organization. Thus, all of these effects of DOI were attributable to 5-HT2A receptors, whereas the effect of LSD on behavioral organization was influenced by both 5-HT2A and 5-HT2C receptors.

Effects of Hallucinogens on Locomotor and Investigatory Activity and Patterns: Influence of 5-HT2A and 5-HT2C Receptors