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- W2003702916 abstract "Analogs of deltorphins, such as cyclo(Nδ, Nδ-carbonyl-d-Orn2, Orn4)deltorphin (DEL-6) and deltorphin II N-(ureidoethyl)amide (DK-4) are functional agonists predominantly for the delta opioid receptors (DOR) in the guinea-pig ileum and mouse vas deferens bioassays. The purpose of this study was to examine an influence of these peptides (5, 10 or 20 nmol, i.c.v.) on the acute cocaine-induced (10mg/kg, i.p.) locomotor activity and the expression of sensitization to cocaine locomotor effect. Sensitization to locomotor effect of cocaine was developed by five injections of cocaine at the dose of 10mg/kg, i.p. every 3 days. Our results indicated that DK-4 and DEL-6 differently affected the acute and sensitized cocaine locomotion. Co-administration of DEL-6 with cocaine enhanced acute cocaine locomotion only at the dose of 10 nmol, with minimal effects at the doses 5 and 20 nmol, whereas co-administration of DK-4 with cocaine enhanced acute cocaine-induced locomotion in a dose-dependent manner. Similarly to the acute effects, DEL-6 only at the dose of 10 nmol but DK-4 dose-dependently enhanced the expression of cocaine sensitization. Pre-treatment with DOR antagonist - naltrindole (5 nmol, i.c.v.) and mu opioid receptor (MOR) antagonist, β-funaltrexamine abolished the ability of both peptides to potentiate the effects of cocaine. Our study suggests that MOR and DOR are involved in the interactions between cocaine and both deltorphins analogs. A distinct dose-response effects of these peptides on cocaine locomotion probably arise from differential functional activation (targeting) of the DOR and MOR by both deltorphins analogs." @default.
- W2003702916 created "2016-06-24" @default.
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- W2003702916 date "2013-10-01" @default.
- W2003702916 modified "2023-09-23" @default.
- W2003702916 title "Involvement of delta and mu opioid receptors in the acute and sensitized locomotor action of cocaine in mice" @default.
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- W2003702916 doi "https://doi.org/10.1016/j.peptides.2013.08.009" @default.
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