| Two selective 5-HT1A receptor antagonists, WAY-100 635 and NDL-249, stimulate locomotion in rats acclimatised to their environment and alter their behaviour: a behavioural analysis. | |
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MedLine Citation:
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PMID: 9809851 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The aim was to study firstly, the motor effects of a new 5-HT1A antagonist, NDL-249 [(R)-3-(N-cyclopentyl-N-propylamino)-8-fluoro-3,4-dihydro-2H-1-benzopyra n-5-carboxamide hydrochloride] and of the reference 5-HT1A antagonist WAY-100 635 [N-(2-(1-(4-(2-methoxyphenyl)piperazinyl))ethyl)-N-(2-pyridinyl) cyclohexanecarboxamide trihydrochloride], in comparison to the 5-HT1A agonist (+/-)-8-OH-DPAT [(8-hydroxy-2-(di-N-propylamino) tetralin, hereafter 8-OH-DPAT], in rats acclimatised to the automated activity cages; secondly, to study whether the behavioural effects of NDL-249 and 8-OH-DPAT are sensitive to the 5-HT depleting effects of p-chlorophenylalanine (PCPA); thirdly, to characterise the nature of the antagonist-induced activation seen in the automatic activity cages with the aid of a behavioural observation analysis; fourthly, to examine the interaction between the 5-HT1A receptors mediating the behavioural effects and dopamine (DA) receptors. NDL-249 was found to bind in vitro to rat hippocampal 5-HT1A receptors with high affinity and selectivity. In second messenger studies, it was devoid of agonist-like effects. In the locomotor activity studies, each antagonist significantly increased the incidence of horizontal activity, peripheral activity and rearing. 8-OH-DPAT, while significantly increasing peripheral and horizontal activities, decreased the incidence of rearing. PCPA blocked the motor effects of NDL-249 but did not affect those of 8-OH-DPAT. Observational analyses indicated that NDL-249 induced significant increases at one or more doses in sniffing, rearing and locomotion together with a significant reduction in stillness. WAY-100 635 significantly increased the incidence of rearing, intense grooming and vacuous chewing. The significant increases in sniffing, grooming and intense grooming and the significant decrease in stillness induced by the DA D1 agonist, SK&F 38393 [(+/-)-1-phenyl-2,3,4,5-tetrahydro-(1H)-3-benzazepine-7,8-diol hydrochloride], were not altered by concomitant pre-treatment with NDL-249. Pre-treatment of rats with either the DA D1 antagonist SCH-23390 (2,3,4,5-tetrahydro-3-methyl-5-phenyl-1H-3-benzazepin-7-ol) or the DA D2 antagonist, raclopride, blocked the reduced stillness and increased sniffing and rearing induced by NDL-249. In conclusion, 5-HT1A antagonists including the new selective antagonist, NDL-249, induce mild behavioural activation in rats, which is mediated probably indirectly via DA systems. |
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Authors:
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D M Jackson; C E Wallsten; E Jerning; P S Hu; A M Deveney |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Psychopharmacology Volume: 139 ISSN: 0033-3158 ISO Abbreviation: Psychopharmacology (Berl.) Publication Date: 1998 Oct |
Date Detail:
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Created Date: 1999-01-19 Completed Date: 1999-01-19 Revised Date: 2003-11-14 |
Medline Journal Info:
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Nlm Unique ID: 7608025 Medline TA: Psychopharmacology (Berl) Country: GERMANY |
Other Details:
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Languages: eng Pagination: 300-10 Citation Subset: IM |
Affiliation:
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Department of Pharmacology, Biochemical Pharmacology and Molecular Pharmacology, Astra Arcus AB, Preclinical Research and Development, Södertälje, Sweden. david.jackson@arcus.se.astra.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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8-Hydroxy-2-(di-n-propylamino)tetralin
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pharmacology Animals Benzopyrans / pharmacology* Male Motor Activity / drug effects* Piperazines / pharmacology* Pyridines / pharmacology* Rats Rats, Sprague-Dawley Receptors, Serotonin / drug effects* Receptors, Serotonin, 5-HT1 Second Messenger Systems Serotonin / physiology Serotonin Agonists / pharmacology Serotonin Antagonists / pharmacology* |
| Chemical | |
Reg. No./Substance:
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0/Benzopyrans; 0/NDL 249; 0/Piperazines; 0/Pyridines; 0/Receptors, Serotonin; 0/Receptors, Serotonin, 5-HT1; 0/Serotonin Agonists; 0/Serotonin Antagonists; 146714-97-8/WAY 100635; 50-67-9/Serotonin; 78950-78-4/8-Hydroxy-2-(di-n-propylamino)tetralin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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