Research article summary (published 30 Dec 1997):

Discriminative stimulus effects of 8-hydroxy-2-(di-n-propylamino)tetralin in pigeons and rats: species similarities and differences.

Full Abstract

In this study we examined the effects of 5-HT1A ligands in rats trained to discriminate 0.16 mg/kg i.p. 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) from saline in a two-lever, fixed ratio (FR)10 schedule of food reinforcement, and in pigeons trained to discriminate 0.31 mg/kg i.m. 8-OH-DPAT from saline in a two-key, FR30 schedule of food reinforcement. In both species, 8-OH-DPAT and a variety of structurally unrelated 5-HT1A ligands occasioned dose-related, relatively high levels of drug-appropriate selection (i.e. > or = 67%). A significant positive correlation was found between estimated ED50 values in both species (r = 0.84, P < .001). Further, 5-HT1A antagonists, NAN-190, penbutolol, (-)-pindolol, tertatolol and WAY-100635, produced dose-related decreases in 8-OH-DPAT-appropriate selection, and their potencies for antagonism in rats and pigeons were highly correlated (r = 0.96, P < .01). The potency of WAY 100635 in rats and pigeons was quantified by Schild analysis (apparent in vivo pA2 values: 7.8 vs. 8.3, rat vs. pigeon respectively). Although most 5-HT1A agonists produced similar 8-OH-DPAT-like discriminative stimulus effects in both species, two compounds, lisuride and eltoprazine, occasioned high levels of drug-appropriate selection in pigeons, but not in rats. In contrast, idazoxan, yohimbine, LEK 8804 and BMY 7378 produced greater effects in rats. Among this latter group of compounds, only BMY 7378 blocked the discriminative stimulus effects of 8-OH-DPAT in pigeons, which suggested that intermediate levels of drug-appropriate selection observed with the remaining compounds are not necessarily the result of low intrinsic activity. Overall, these results demonstrate similarities in the discriminative stimulus effects of 8-OH-DPAT in rats and pigeons despite different training conditions (e.g., training dose and route of administration). Even so, the finding that some 5-HT1A ligands did not produce similar effects in rats and pigeons illustrates the need to examine possible 8-OH-DPAT-like discriminative stimulus effects of compounds in both species.

Author information

Author/s: Kleven, M S (MS); Koek, W (W);

Affiliation: Centre de Recherche Pierre Fabre, Castres, France.

Journal and publication information

Publication Type: Journal Article

Journal: The Journal of pharmacology and experimental therapeutics (J Pharmacol Exp Ther), published in UNITED STATES. (Language: eng)

Reference: 1998-Jan; vol 284 (issue 1) : pp 238-49

Dates: Created 1998/02/11; Completed 1998/02/11; Revised 2004/11/17;

PMID: 9435184, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

8-Hydroxy-2-(di-n-propylamino)tetralin - pharmacology Animals Columbidae Discrimination Learning - drug effects Male Piperazines - pharmacology

Pyridines - pharmacology Pyrimidines - pharmacology Rats Serotonin Agonists - pharmacology Serotonin Antagonists - pharmacology Species Specificity

Associated Chemicals: Piperazines (0) ; Pyridines (0) ; Pyrimidines (0) ; Serotonin Agonists (0) ; Serotonin Antagonists (0) ; alpha-(4-fluorophenyl)-4-(5-fluoro-2-pyrimidinyl)-1-piperazine butanol (105565-56-8) ; WAY 100635 (146714-97-8) ; 8-Hydroxy-2-(di-n-propylamino)tetralin (78950-78-4)

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