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Research ArticleArticle

Selective Antiaggressive Effects of Alnespirone in Resident-Intruder Test Are Mediated via 5-Hydroxytryptamine1A Receptors: A Comparative Pharmacological Study with 8-Hydroxy-2-Dipropylaminotetralin, Ipsapirone, Buspirone, Eltoprazine, and WAY-100635

S. F. de Boer, M. Lesourd, E. Mocaer and J. M. Koolhaas
Journal of Pharmacology and Experimental Therapeutics March 1999, 288 (3) 1125-1133;
S. F. de Boer
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M. Lesourd
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E. Mocaer
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J. M. Koolhaas
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Abstract

The present study characterized the effects of the novel, selective, and potent 5-hydroxytryptamine1A (serotonin) (5-HT1A) receptor agonist, alnespirone [S-20499, (S)-N-4-[5-methoxychroman-3-yl)propylamino)butyl-8-azaspiro-(4,5)-diacetamide, hydrochloride] on offensive and defensive resident-intruder aggression in wild-type rats and compared its actions with those of the prototypical full 5-HT1A agonist 8-hydroxy-2-dipropylaminotetralin (8-OH-DPAT), the partial 5-HT1A agonists ipsapirone and buspirone, and the mixed 5-HT1A/1B agonist eltoprazine. All five agonists exerted effective dose-dependent decreases of offensive aggressive behavior in resident rats; 8-OH-DPAT was the most potent (ID50 = 0.074 mg/kg), followed by eltoprazine (0.24), buspirone (0.72), ipsapirone (1.08), and alnespirone (1.24). However, in terms of selectivity of the antiaggressive effects as determined by the absence of decrements in social interest and general motor activity, alnespirone appeared to be superior. In the defensive aggression test, neither alnespirone nor any of the other four agonists changed defensive behaviors in the intruder rats. The involvement of 5-HT1A receptors in the antiaggressive actions of these drugs was confirmed by showing that the selective 5-HT1A receptor antagonist WAY-100635 (N-[2-[4-(2-methoxyphenyl)-1-piperazinyl]ethyl]-N-(2-pyridinyl)cyclohexanecarboxamide trihydrochloride), which was inactive alone, fully prevented the antiaggressive effects of alnespirone, 8-OH-DPAT, and buspirone and partly reversed those of ipsapirone and eltoprazine. The data clearly indicate that alnespirone effectively suppresses offensive aggression with an advantageous profile of action compared with other full or partial 5-HT1A agonists. These selective antiaggressive actions of alnespirone are mediated by stimulating 5-HT1Areceptors, presumably the somatodendritic autoreceptors at the raphe nuclei. Furthermore, the data provide evidence for a major involvement of these 5-HT1A receptors in the modulation of aggressive behavior by 8-OH-DPAT, ipsapirone, buspirone, and eltoprazine.

Footnotes

  • Send reprint requests to: Dr. S. F. de Boer, Department of Animal Physiology, University of Groningen, P.O. Box 14, 9750 AA Haren, the Netherlands. E-mail:boersf{at}biol.rug.nl.

  • Abbreviations:
    5-HT
    5-hydroxytryptamine (serotonin)
    8-OH-DPAT
    8-hydroxy-2-dipropylaminotetralin
    ALT
    attack latency time
    ID
    inhibitory dose
    WAY-100635
    N-[2-[4-(2-methoxyphenyl)-1-piperazinyl]ethyl]-N-(2-pyridinyl)cyclohexanecarboxamide trihydrochloride
    • Received May 28, 1998.
    • Accepted October 6, 1998.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 288 (3)
Journal of Pharmacology and Experimental Therapeutics
Vol. 288, Issue 3
1 Mar 1999
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Selective Antiaggressive Effects of Alnespirone in Resident-Intruder Test Are Mediated via 5-Hydroxytryptamine1A Receptors: A Comparative Pharmacological Study with 8-Hydroxy-2-Dipropylaminotetralin, Ipsapirone, Buspirone, Eltoprazine, and WAY-100635
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Research ArticleArticle

Selective Antiaggressive Effects of Alnespirone in Resident-Intruder Test Are Mediated via 5-Hydroxytryptamine1A Receptors: A Comparative Pharmacological Study with 8-Hydroxy-2-Dipropylaminotetralin, Ipsapirone, Buspirone, Eltoprazine, and WAY-100635

S. F. de Boer, M. Lesourd, E. Mocaer and J. M. Koolhaas
Journal of Pharmacology and Experimental Therapeutics March 1, 1999, 288 (3) 1125-1133;

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Research ArticleArticle

Selective Antiaggressive Effects of Alnespirone in Resident-Intruder Test Are Mediated via 5-Hydroxytryptamine1A Receptors: A Comparative Pharmacological Study with 8-Hydroxy-2-Dipropylaminotetralin, Ipsapirone, Buspirone, Eltoprazine, and WAY-100635

S. F. de Boer, M. Lesourd, E. Mocaer and J. M. Koolhaas
Journal of Pharmacology and Experimental Therapeutics March 1, 1999, 288 (3) 1125-1133;
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