PubMed:14592677 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/14592677","sourcedb":"PubMed","sourceid":"14592677","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/14592677","text":"GHB differentially affects morphine actions on motor activity and social behaviours in male mice.\nThere are several reports suggesting that gamma-hydroxybutyric acid (GHB) influences the endogenous opioid system. The present study aimed to investigate the effects of GHB on motor and social activities and to examine its influence on morphine's actions on these behaviours. In a first experiment, several doses of GHB were studied but only the highest (200 and 400 mg/kg) produced a decrease in spontaneous motor activity measured in an actimeter cage. When hyperactivity induced by injecting 50 mg/kg of morphine was evaluated, all the GHB doses efficiently counteracted this morphine action. Using the paradigm of isolation-induced aggression, administration of 200 mg/kg of GHB significantly decreased threat and attack without impairing motor activity and, in addition, increased time spent in social contact. GHB increased morphine's suppression of threat or nonsocial exploratory behaviours. In conclusion, the interaction between GHB and the opioid systems was confirmed, with the drug having an additive effect on morphine-affected social behaviours but counteracting morphine-induced increases in motor 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