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- W2000510919 abstract "Abstract Rationale. Orphanin FQ/nociceptin (OFQ/N), the endogenous ligand of the opioid receptor-like (ORL-1) receptor, shows similarities to dynorphin A (1–17) in structure and functions. Dynorphin and other kappa opioid receptor agonists have been shown to block cocaine sensitization. Objective. The present study was designed to examine the ability of OFQ/N to block cocaine-induced behavioral sensitization. Methods. Rats were habituated to testing chambers for 1 h, injected with artificial cerebrospinal fluid (aCSF) or OFQ/N (15 nmol) followed by saline or cocaine (20 mg/kg) and locomotor activity was measured for a further 1 h. Rats were treated similarly for the next 2 days except the dose of OFQ/N was doubled on each subsequent day. Rats were then challenged with cocaine (7.5 mg/kg) in the absence of OFQ/N on day 8. The specificity of OFQ/N's action was examined in the presence of J-113397 (30 nmol), an ORL-1 receptor antagonist. The ability of OFQ/N to block the context-independent component of cocaine sensitization was also tested wherein rats were treated in their home cages on days 1–3. Finally, the effect of intra-VTA OFQ/N administration on cocaine sensitization was examined. Results. Sensitization did not develop in rats repeatedly treated with OFQ/N, via either route of administration, prior to cocaine administration on days 1–3. The inhibitory effect of OFQ/N was not dependent on context and was blocked by pretreatment with J-113397. Conclusion. Our results indicate that OFQ/N blocks cocaine-induced behavioral sensitization through activation of the ORL-1 receptor and that the VTA may be one of the substrates for this action of OFQ/N." @default.
- W2000510919 created "2016-06-24" @default.
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- W2000510919 date "2002-11-01" @default.
- W2000510919 modified "2023-10-17" @default.
- W2000510919 title "Orphanin FQ/nociceptin blocks cocaine-induced behavioral sensitization in rats" @default.
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- W2000510919 doi "https://doi.org/10.1007/s00213-002-1192-1" @default.
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