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- W2140438297 abstract "We previously demonstrated that noxious peripheral stimulation (e.g. subdermal capsaicin injection in the hind paw) produces antinociception that is mediated by opioid receptors in nucleus accumbens. The current study used the trigeminal jaw-opening nociceptive reflex responses in the rat to assess the role of intra-accumbens mu-, delta- and kappa-opioid receptors in the antinociceptive effect of noxious stimulation and intra-accumbens opioid agonism. Whilst intra-accumbens injection of either the mu-receptor-selective antagonist Cys2,Tyr3,Orn5,Pen7amide (CTOP) or the delta-receptor-selective antagonist naltrindole blocked capsaicin-induced antinociception, neither the selective mu-agonist [D-Ala2,N-Me-Phe4,Gly5-ol]-enkephalin (DAMGO; 150 or 300 ng) nor the selective delta-agonist D-Pen2,5-enkephalin (DPDPE; 150 or 300 ng) alone induced antinociception. Simultaneous injection of DAMGO and DPDPE (150 ng each), however, produced significant antinociception. Capsaicin-induced antinociception was not blocked by the selective kappa-receptor antagonist nor-binaltorphimine, but was blocked by the kappa-agonist U69,593. U69,593 also antagonized the antinociceptive effect of the DAMGO/DPDPE combination. Thus, in nucleus accumbens, mu- and delta- but not kappa-opioid receptors contributed to capsaicin-induced antinociception; selective activation of individual receptor subtypes was insufficient, but coactivation of mu- and delta-opioid receptors induced antinociception, and kappa-receptors appeared to play an antianalgesic role in nucleus accumbens." @default.
- W2140438297 created "2016-06-24" @default.
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- W2140438297 date "2002-03-01" @default.
- W2140438297 modified "2023-10-15" @default.
- W2140438297 title "µ/δ Cooperativity and opposing κ-opioid effects in nucleus accumbens-mediated antinociception in the rat" @default.
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- W2140438297 doi "https://doi.org/10.1046/j.1460-9568.2002.01915.x" @default.
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