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Cross-tolerance studies of serotonin receptors involved in behavioral effects of LSD in rats

Like hallucinogenic 5-HT₂ agonists, LSD (d-lysergic acid diethylamide) produces characteristic decreases in locomotor activity and investigatory behaviors of rats tested in a novel environment. Because LSD is an agonist at both 5-HT_1A and 5-HT₂ receptors, however, the respective influences of these different receptors in the behavioral effects of LSD remain unclear. In particular, the paucity of selective 5-HT_1A antagonists has made it difficult to assess the specific contribution of 5-HT_1A receptors to the effects of LSD. An alternative approach to the delineation of receptor-specific effects is the use of cross-tolerance regimens. In the present studies, rats were pretreated with saline, 8-hydroxy-2(di-n-propylamino)tetralin (8-OH-DPAT) (0.5 mg/kg SC), 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane (DOI) (1.0 mg/kg SC), or LSD (60 µg/kg SC), every 12 h for 5 or 8 days. Thirty-six hours later, rats were tested in a behavioral pattern monitor 10 min after injection of saline, 0.5 mg/kg 8-OH-DPAT, 1.0 mg/kg DOI, or 60 µg/kg LSD. As expected, tolerance to the decreases in locomotor activity produced by acute administrations of 8-OH-DPAT, DOI, or LSD occurred when rats were pretreated chronically with 8-OH-DPAT, DOI, or LSD, respectively. Furthermore, pretreatment with either 8-OH-DPAT or DOI produced cross-tolerance to LSD. These results support the hypothesis that the effects of LSD in this model reflect a combination of 5-HT_1A and 5-HT₂ effects and support the view that there is an interaction between 5-HT_1A and 5-HT₂ receptors.

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1. Department of Psychology, University of California at San Diego, 9500 Gilman Drive, 92093-0804, La Jolla, CA, USA

   Kirsten M. Krebs

2. Department of Psychiatry, University of California at San Diego, 9500 Gilman Drive, 92093-0804, La Jolla, CA, USA

   Mark A. Geyer

1. Kirsten M. Krebs
2. Mark A. Geyer

Krebs, K.M., Geyer, M.A. Cross-tolerance studies of serotonin receptors involved in behavioral effects of LSD in rats. Psychopharmacology 113, 429–437 (1994). https://doi.org/10.1007/BF02245219

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• Received: 16 February 1993

• Revised: 04 May 1993

• Issue Date: January 1994

• DOI: https://doi.org/10.1007/BF02245219

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