Activation of 5-HT 2B Receptors in the Medial Amygdala causes Anxiolysis in the Social Interaction Test in the Rat

Activation of 5-HT 2B Receptors in the Medial Amygdala causes Anxiolysis in the Social... In a recent study, we reported the presence of neurones expressing 5-HT 2B receptor protein in the medial amygdaloid nucleus of the adult rat brain. In the present study, bilateral micro-injection of the 5-HT 2B receptor agonist 1-(5-(2-thienylmethoxy)-1H-3-indolyl)propan-2-amine hydrochloride (BW 723C86, 0.09 and 0.93 nmol, 5 min pretest) into the medial amygdaloid nuclei increased the total interaction time of a pair of male rats in the social interaction test, to a comparable extent to chlordiazepoxide (5 mg/kg p.o., 1 hr pretest) without altering locomotor activity; indicative of anxiolytic activity. The increase in social interaction was prevented by pretreatment with the 5-HT 2C/2B receptor antagonist N -(1-methyl-5-indoyl)- N ′-(3-pyridyl) urea hydrochloride (SB 200646A, at 2 but not 1 mg/kg p.o., 1 hr pretest), which did not alter behaviour when given alone. Intra-amygdala BW 723C86 (0.09, 0.31 and 0.93 nmol, 5 min pretest) did not significantly alter the number of punished responses made when the same rats were examined seven days later in a Vogel punished drinking test, although chlordiazepoxide (5 mg/kg p.o., 1 hr pretest) produced the expected anxiolytic profile. The results are consistent with the proposal that activation of 5-HT 2B receptors in the medial amygdala induces anxiolysis in the social interaction model but has little effect on behaviour in a punished conflict model of anxiety. These data suggest that serotonergic neurotransmission in this nucleus may selectively affect specific kinds of anxiety generated by different animal models. © 1997 Elsevier Science Ltd. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Neuropharmacology Elsevier

Activation of 5-HT 2B Receptors in the Medial Amygdala causes Anxiolysis in the Social Interaction Test in the Rat

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Publisher
Elsevier
Copyright
Copyright © 1997 Elsevier Science Ltd
ISSN
0028-3908
eISSN
1873-7064
DOI
10.1016/S0028-3908(97)00042-7
Publisher site
See Article on Publisher Site

Abstract

In a recent study, we reported the presence of neurones expressing 5-HT 2B receptor protein in the medial amygdaloid nucleus of the adult rat brain. In the present study, bilateral micro-injection of the 5-HT 2B receptor agonist 1-(5-(2-thienylmethoxy)-1H-3-indolyl)propan-2-amine hydrochloride (BW 723C86, 0.09 and 0.93 nmol, 5 min pretest) into the medial amygdaloid nuclei increased the total interaction time of a pair of male rats in the social interaction test, to a comparable extent to chlordiazepoxide (5 mg/kg p.o., 1 hr pretest) without altering locomotor activity; indicative of anxiolytic activity. The increase in social interaction was prevented by pretreatment with the 5-HT 2C/2B receptor antagonist N -(1-methyl-5-indoyl)- N ′-(3-pyridyl) urea hydrochloride (SB 200646A, at 2 but not 1 mg/kg p.o., 1 hr pretest), which did not alter behaviour when given alone. Intra-amygdala BW 723C86 (0.09, 0.31 and 0.93 nmol, 5 min pretest) did not significantly alter the number of punished responses made when the same rats were examined seven days later in a Vogel punished drinking test, although chlordiazepoxide (5 mg/kg p.o., 1 hr pretest) produced the expected anxiolytic profile. The results are consistent with the proposal that activation of 5-HT 2B receptors in the medial amygdala induces anxiolysis in the social interaction model but has little effect on behaviour in a punished conflict model of anxiety. These data suggest that serotonergic neurotransmission in this nucleus may selectively affect specific kinds of anxiety generated by different animal models. © 1997 Elsevier Science Ltd.

Journal

NeuropharmacologyElsevier

Published: Apr 1, 1997

References

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