Attenuation of morphine withdrawal signs by a D1 receptor agonist in the locus coeruleus of rats.
In the present study, the effects of intra-locus coeruleus injection of a dopamine D(1) receptor agonist (SKF38393) on naloxone-induced withdrawal signs of morphine-dependent rats were examined. Twenty different withdrawal signs were assessed. The total withdrawal score was calculated and used as an index of withdrawal intensity for comparison. The D(1) agonist and antagonist were injected 15 and 30 min prior to expression of naloxone-induced withdrawal signs, respectively. SKF38393 (2 and 4 microg/site) decreased while SCH23390 (a D(1) antagonist) had no effect on the total withdrawal score. On the other hand, SCH23390 (25 ng/site) reversed the SKF38393 effect. It may be concluded that activation of dopamine D(1) receptors in the locus coeruleus attenuates naloxone-induced withdrawal.
Dizgah
Iraj Mirzaii
IM
Department of Physiology, School of Medicine, Tehran University of Medical Sciences, Iran.
Karimian
Seyed Morteza
SM
Zarrindast
Mohammad Reza
MR
Sohanaki
Hamid
H
D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine / Q000008:administration & dosage / Q000037:antagonists & inhibitors / Q000627:therapeutic use*; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D001552:Benzazepines / Q000008:administration & dosage / Q000494:pharmacology; D018491:Dopamine Agonists / Q000008:administration & dosage / Q000627:therapeutic use*; D007267:Injections; D008125:Locus Coeruleus / Q000502:physiology*; D008297:Male; D009021:Morphine Dependence; D009270:Naloxone / Q000008:administration & dosage / Q000494:pharmacology; D009292:Narcotic Antagonists / Q000008:administration & dosage / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D017447:Receptors, Dopamine D1 / Q000819:agonists* / Q000037:antagonists & inhibitors; D013375:Substance Withdrawal Syndrome / Q000188:drug therapy*
D001552:Benzazepines; D018491:Dopamine Agonists; D009292:Narcotic Antagonists; D017447:Receptors, Dopamine D1; D009270:Naloxone; D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine