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Inhibitory Effect of Morphine on Yawning Induced by Cholinoceptor and Dopamine D2 Receptor Activation in Rats

Overview
Journal Br J Pharmacol
Publisher Wiley
Specialty Pharmacology
Date 1992 Mar 1
PMID 1385751
Citations 6
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Abstract

1. Bromocriptine (2, 4 and 8 mg kg-1, i.p.), physostigmine (0.05, 0.1 and 0.2 mg kg-1, i.p.) and pilocarpine (1, 3 and 5 mg kg-1, i.p.) induced dose-dependent yawning in rats. 2. These responses were reduced in a dose-dependent manner by pretreatment with morphine. 3. The inhibitory effect of morphine was reversed by naloxone. 4. Naloxone alone induced slight but significant yawning. 5. The present results suggest that morphine inhibits yawning in rats at an opiate receptor downstream from the sites at which cholinoceptor and dopamine D2 activation induce yawning. The anatomical location of these sites remains to be established.

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