Buprenorphine-induced alterations of cocaine's reinforcing effects in rhesus monkey: a dose-response analysis

Buprenorphine-induced alterations of cocaine's reinforcing effects in rhesus monkey: a... Buprenorphine reduces cocaine self-administration by rhesus monkeys, opiate- and cocaine-dependent men and polydrug abusers, but the mechanisms underlying these cocaine-opiate interactions are not well understood. In the present study, the effects of daily placebo or buprenorphine (0.1,0.3 and 1.0 mg/kg) treatment on cocaine self-administration (0.001–0.3 mg/kg/inject) were examined in five cocaine-experienced rhesus monkeys. Saline and each of six cocaine doses were available in an irregular order. Responding for cocaine (or saline) and food was maintained on a second order FR4 (VR 16:5) schedule of reinforcement. During placebo treatment, the daily number of cocaine injections increased as the unit dose was increased and then decreased at higher doses. Cocaine doses that maintained the highest rates of responding during placebo treatment were more resistant to buprenorphine's effects. The typical increase in response rate during the first five cocaine injections of a session also was attenuated by buprenorphine. The ascending limb of the cocaine dose-response curve was shifted downward and approximately one log unit to the right during low-dose buprenorphine treatment (0.1 mg/kg/day). In contrast, individual response rates for food pellets were unaffected. We conclude that buprenorphine selectively decreases self-administration of some unit doses of cocaine at doses that have minimal effects on food-maintained responding. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Drug and Alcohol Dependence Elsevier

Buprenorphine-induced alterations of cocaine's reinforcing effects in rhesus monkey: a dose-response analysis

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Publisher
Elsevier
Copyright
Copyright © 1995 Elsevier Ltd
ISSN
0376-8716
DOI
10.1016/0376-8716(95)01195-1
Publisher site
See Article on Publisher Site

Abstract

Buprenorphine reduces cocaine self-administration by rhesus monkeys, opiate- and cocaine-dependent men and polydrug abusers, but the mechanisms underlying these cocaine-opiate interactions are not well understood. In the present study, the effects of daily placebo or buprenorphine (0.1,0.3 and 1.0 mg/kg) treatment on cocaine self-administration (0.001–0.3 mg/kg/inject) were examined in five cocaine-experienced rhesus monkeys. Saline and each of six cocaine doses were available in an irregular order. Responding for cocaine (or saline) and food was maintained on a second order FR4 (VR 16:5) schedule of reinforcement. During placebo treatment, the daily number of cocaine injections increased as the unit dose was increased and then decreased at higher doses. Cocaine doses that maintained the highest rates of responding during placebo treatment were more resistant to buprenorphine's effects. The typical increase in response rate during the first five cocaine injections of a session also was attenuated by buprenorphine. The ascending limb of the cocaine dose-response curve was shifted downward and approximately one log unit to the right during low-dose buprenorphine treatment (0.1 mg/kg/day). In contrast, individual response rates for food pellets were unaffected. We conclude that buprenorphine selectively decreases self-administration of some unit doses of cocaine at doses that have minimal effects on food-maintained responding.

Journal

Drug and Alcohol DependenceElsevier

Published: Nov 1, 1995

References

  • Progressive ratio and fixed ratio schedules of cocaine-maintained responding in baboons
    Griffiths, R.R.; Bradford, L.D.; Brady, J.V.
  • A controlled trial of buprenorphine treatment for opioid dependence
    Johnson, R.E.; Jaffe, J.H.; Fudala, P.J.
  • Treatment of cocaine abuse with buprenorphine
    Kosten, T.R.; Kleber, H.D.; Morgan, C.
  • Phencyclidine-analogue self-injection by the baboon
    Lukas, S.E.; Griffiths, R.R.; Brady, J.V.; Wurster, R.M.
  • Kappa antagonist properties of buprenorphine in non-tolerant and morphine-tolerant rats
    Negus, S.S.; Picker, M.J.; Dykstra, L.A.

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