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S Izenwasser, B Buzas and BM Cox
Department of Pharmacology, Uniformed Services University, Bethesda, Maryland.
The regulation of adenylyl cyclase by opioid receptor types was characterized in the rat nucleus accumbens, a brain region that is involved in the reinforcing effects of drugs of abuse, and in the caudate putamen, a region not implicated in drug reinforcement. Both mu and delta opioid ligands inhibited adenylyl cyclase activity in the nucleus accumbens and in the caudate putamen of rat, whereas the kappa agonist, U69,593 (5 alpha, 7 alpha, 8 alpha)-(+)-N-methyl-N-[7- (pyrrolidinyl)-1-oxaspiro [4,5]dec-8-yl]-benzeneacetamide, was ineffective. The mu agonists, DAMGO and Tyr-D-Arg-Phe-Sar, were more potent inhibitors of the enzyme in caudate putamen than in nucleus accumbens. The delta-selective agonists, DSLET and [D-Ala2]-deltorphin II more potently inhibited adenylyl cyclase in nucleus accumbens than in caudate putamen. Inhibition of the enzyme by DAMGO and Tyr-D-Arg-Phe- Sar was antagonized by the mu-selective competitive antagonist, CTOP D- Phe-Cys-Tyr-D-Trp-Orn-Thr-Pen-Thr-NH2, and the noncompetitive mu antagonists, beta-funaltrexamine and naloxonazine. Inhibition of adenylyl cyclase activity by the delta-selective ligands, DPDPE, DSLET and [D-Ala2]-deltorphin II was unaffected by these antagonists. Conversely, the delta-selective antagonists, ICI 174,864 N-allyl2-Tyr- (alpha-aminisobutyric acid)2-Phe-Leu-OH and naltrindole, blocked the effects of the delta but not the mu opioid ligands. Adenylyl cyclase activity in nucleus accumbens and in caudate putamen is subject to regulation by both mu and delta opioid receptors.
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