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CB1 cannabinoid receptor-mediated aggressive behavior.

Abstract：

:This study examined the role of cannabinoid CB1 receptors (CB1r) in aggressive behavior. Social encounters took place in grouped and isolated mice lacking CB1r (CB1KO) and in wild-type (WT) littermates. Cognitive impulsivity was evaluated in the delayed reinforcement task (DRT). Gene expression analyses of monoaminooxidase-A (MAO-A), catechol-o-methyl-transferase (COMT), 5-hydroxytriptamine transporter (5-HTT) and 5-HT1B serotonergic receptor (5HT1Br) in the median and dorsal raphe nuclei (MnR and DR, respectively) and in the amygdala (AMY) were performed by real time-PCR. Double immunohistochemistry studies evaluated COMT and CB1r co-localization in the raphe nuclei and in the cortical (ACo), basomedian (BMA) and basolateral (BLA) amygdaloid nuclei. The behavioral effects of the CB1r agonist ACEA (1 and 2 mg/kg) on aggression were also evaluated in isolated OF1 mice. CB1KO mice housed in groups showed higher levels of offensive aggression. Isolation increased aggressive behavior only in WT. In grouped CB1KO mice COMT gene expression was significantly higher in the MnR and DR, while MAO-A gene expression was lower in the MnR. Gene expression of 5HT1Br, COMT and MAO-A was higher in the amygdala of CB1KO mice. CB1r double-immunohistochemistry revealed cytoplasmic-labeled COMT-ir cells in the raphe nuclei and in the ACo, BMA and BLA. CB1r immunolabeling was observed only in ACo, BMA and BLA, where it was localized in axons and buttons. The density of labeled processes increased in BLA. Acute administration of the CB1 agonist ACEA (2 mg/kg) significantly decreased the aggression levels of OF1 mice. These results suggest that CB1r plays an important role in social interaction and aggressive behavior.

journal_name

Neuropharmacology

journal_title

Neuropharmacology

authors

Rodriguez-Arias M,Navarrete F,Daza-Losada M,Navarro D,Aguilar MA,Berbel P,Miñarro J,Manzanares J

doi

10.1016/j.neuropharm.2013.07.013

subject

Has Abstract

pub_date

2013-12-01 00:00:00

pages

172-80

eissn

0028-3908

issn

1873-7064

pii

S0028-3908(13)00330-4

journal_volume

75

pub_type

杂志文章

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