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Activation of mu opioid receptors in the nucleus raphe dorsalis blocks apomorphine-induced aggression in rats: serotonin appears not to be involved.

Abstract：

:The role of mu opioid receptors in the nucleus raphe dorsalis (DR) in the control of apomorphine-induced aggression was studied in rats. Administration in the DR of a selective mu opioid receptor agonist, (D-Ala2,N-Me-Phe4,Gly5-ol)-enkephalin (DAGO), in doses ranging from 0.01 to 1 microgram/0.5 microliter, dose-dependently reduced aggression caused by apomorphine 20 mg/kg intraperitoneally. 0.01 microgram DAGO significantly reduced the time spent by the animals in aggressive posture and 0.1 and 1 microgram markedly reduced both aggressive postures and attacks. 5 micrograms (in 0.5 microliter) naloxone in the DR completely antagonized the anti-aggressive effect of DAGO (0.1 microgram/0.5 microliter) injected in the same area. 0.1 and 1 microgram but not 0.01 microgram DAGO significantly increased serotonin (5-HT) metabolism in the striatum, a terminal area almost exclusively innervated by DR, indicating that the activity of 5-HT cells in the DR was modified by DAGO. In animals given 6 micrograms/3 microliters 5,7-dihydroxytryptamine in the DR 11 days before, in which striatal 5-HT levels were markedly depleted, no significant changes were found in the time spent by the apomorphine-treated animals in aggressive postures, numbers of attacks or anti-aggressive effect of 0.1 and 1 microgram DAGO administered in the DR. The study shows for the first time that activation of mu opioid receptors in the DR has a powerful anti-aggressive effect in one model of experimental aggression by a mechanism apparently not involving changes in the activity of 5-HT cells in this area.

journal_name

Brain Res

journal_title

Brain research

authors

Giraud O,Cervo L,Grignaschi G,Samanin R

doi

10.1016/0006-8993(89)90706-3

subject

Has Abstract

pub_date

1989-05-29 00:00:00

pages

174-9

issue

1-2

eissn

0006-8993

issn

1872-6240

pii

0006-8993(89)90706-3

journal_volume

488

pub_type

杂志文章

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