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- W2085174572 abstract "The ability of the competitive opioid antagonist, naltrexone, to protect opioid receptors from inactivation by the nonequilibrium antagonists, β-funaltrexamine (β-FNA) and nor-binaltorphimine (nor-BNI), was examined in vivo. Male rats were injected SC with 10 mg/kg naltrexone or saline, 30 min before being injected intracisternally (IC) with water, 10 μg β-FNA, or 1.0 or 10 μg nor-BNI. The rats were tested for analgesic responses to either U69,593 (nor-BNI groups) or morphine (β-FNA groups), on a 50°C hot plate, 24 h later. Morphine produced dose-related increases in the latency to paw lick in rats that received water (IC) (mean ED50 = 3.2 mg/kg). Little or no analgesia occurred after 1.0–30 mg/kg of morphine in animals that had received saline (SC) and 10 μg β-FNA (IC) 24 h earlier. Pretreatment with 10 mg/kg naltrexone attenuated the antagonist effects of β-FNA (morphine ED50 = 10.8 mg/kg). U69,593 also produced analgesia in animals that received water (IC) (ED50 = 0.97 mg/kg). This analgesia was dose-dependently blocked by nor-BNI for up to 7 days. Naltroxone did not inhibit the actions of nor-BNI. Thus, naltroxone prevented inactivation of μ receptors by β-FNA but not inactivation of κ receptors by nor-BNI, suggesting that antagonist interactions with μ receptors are different from those with κ receptors." @default.
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- W2085174572 date "1993-12-01" @default.
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- W2085174572 title "Naltrexone in vivo protects μ receptors from inactivation by β-funaltrexamine, but not κ receptors from inactivation by nor-binaltorphimine" @default.
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- W2085174572 doi "https://doi.org/10.1016/0091-3057(93)90206-9" @default.
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