Codeine and 6-Acetylcodeine Analgesia in Mice |
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Authors: | Steven Milo Michael Ansonoff Michael King Grace C Rossi Amy Zuckerman John Pintar Gavril W Pasternak |
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Institution: | (1) Laboratory of Molecular Neuropharmacology, Memorial Sloan-Kettering Cancer Center, 1275 York Ave, New York, New York 10021, USA;(2) Department of Neuroscience and Cell Biology, University of Medicine and Dentistry of New Jersey, Piscataway, New Jersey 08854, USA |
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Abstract: | Summary 1. Acetylation of morphine at the 6-position changes its pharmacology. To see if similar changes are seen with codeine, we examined the analgesic actions of codeine and 6-acetylcodeine.2. Like codeine, 6-acetylcodeine is an effective analgesic systemically, supraspinally and spinally, with a potency approximately a third that of codeine.3. The sensitivity of 6-acetylcodeine analgesia to the mu-selective antagonists β-FNA and naloxonazine confirmed its classification as a mu opioid. However, it differed from the other mu analgesics in other paradigms.4. Antisense mapping revealed the sensitivity of 6-acetylcodeine to probes targeting exons 1 and 2 of the mu opioid receptor gene (Oprm), a profile distinct from either codeine or morphine. Although heroin analgesia also is sensitive to antisense targeting exons 1 and 2, heroin analgesia also is sensitive to the antagonist 3-O-methylnaltrexone, while 6-acetylcodeine analgesia is not.5. Thus, 6-acetylcodeine is an effective mu opioid analgesic with a distinct pharmacological profile. |
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Keywords: | codeine opioid MOR-1 analgesia 6-acetylcodeine antisense Mu opioid receptor morphine heroin |
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