d-ala2-methionine-enkephalinamide self-administration in the morphine-dependent rat View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1980-07

AUTHORS

Frank C. Tortella, J. Edward Moreton

ABSTRACT

The self-administration of D-enkephalin was studied in the dependent rat self-administering morphine. The rats were prepared with chronic IV and bilateral intraventricular (IVT) injection cannulae. They were made physically dependent on morphine and trained to lever press for IV morphine self-injections (inj) (10 mg/kg) on a fixed ratio (20) (FR20) schedule of reinforcement. Substitution of D-enkephalin either IVT (40 microgram/inj) or IV (10 mg/kg/inj) in the morphine-dependent rat maintained consistent lever pressing and self-administration behavior similar to morphine self-administration. No signs of abstinence were observed during the D-enkephalin substitution. However, saline substitution (0.05 ml/inj IV) for morphine in the self-administering rat produced an abstinence syndrome characterized by extinction of responding, wet-dog shakes, writhes, and diarrhea, which were reversed for 1 h by a single IVT injection of D-enkephalin (40 or 80 microgram). These results indicate that D-enkephalin will serve as a reinforcer to maintain opiate-seeking behavior and support physical dependence in the rat. More... »

PAGES

143-147

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00427640

DOI

http://dx.doi.org/10.1007/bf00427640

DIMENSIONS

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PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/6779307


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