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The 5-HT1A receptor and the stimulus effects of LSD in the rat

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Abstract

Rationale

It has been suggested that the 5-HT1A receptor plays a significant modulatory role in the stimulus effects of the indoleamine hallucinogen lysergic acid diethylamide (LSD).

Objective

The present study sought to characterize the effects of several compounds with known affinity for the 5-HT1A receptor on the discriminative stimulus effects of LSD.

Methods

Twelve male Fischer 344 rats were trained in a two-lever, fixed-ratio (FR) 10, and food-reinforced task with LSD (0.1 mg/kg, i.p.; 15-min pretreatment) as a discriminative stimulus. Combination and substitution tests with the 5-HT1A agonists, 8-OH-DPAT, buspirone, gepirone, and ipsapirone, with LSD-induced stimulus control were then performed. The effects of these 5-HT1A ligands were also tested in the presence of the selective 5-HT1A receptor antagonist, WAY-100,635 (0.3 mg/kg, s.c.; 30-min pretreatment).

Results

In combination tests, stimulus control by LSD was increased by all 5-HT1A receptor ligands with agonist properties. Similarly, in tests of antagonism, the increase in drug-appropriate responding caused by stimulation of the 5-HT1A receptor was abolished by administration of WAY-100,635.

Conclusion

These data, obtained using a drug discrimination model of the hallucinogenic effects of LSD, provide support for the hypothesis that the 5-HT1A receptor has a significant modulatory role in the stimulus effects of LSD.

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Acknowledgements

This study was supported in part by US Public Health Service Grant DA 03385, National Research Service Awards DA 13920-01 (J.R.E.), and DA 16457-01 (C.J.R.).

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Authors and Affiliations

  1. Department of Pharmacology and Toxicology, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA

    C. J. Reissig, J. R. Eckler, R. A. Rabin & J. C. Winter

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  1. C. J. Reissig
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  2. J. R. Eckler
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  3. R. A. Rabin
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  4. J. C. Winter
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Correspondence to C. J. Reissig.

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Reissig, C.J., Eckler, J.R., Rabin, R.A. et al. The 5-HT1A receptor and the stimulus effects of LSD in the rat. Psychopharmacology 182, 197–204 (2005). https://doi.org/10.1007/s00213-005-0068-6

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