title: Involvement of G-protein-activated inwardly rectifying K (GIRK) channels in opioid-induced analgesia.
abstract: To investigate the role of G-protein-activated inwardly rectifying K+ (GIRK) channels in opioid-induced analgesia, we compared the effects of opioids in wild-type and weaver mutant mice having mutant GIRK channels. In the tail-flick and hot-plate tests, weaver mutant mice displayed significantly lower analgesia after either morphine or (-)-U-50488 administration. These findings suggest that GIRK channel activation is important in the induction of analgesia by opioids.
authors.affiliation: Laboratory for Neurobiology of Emotion, RIKEN, Brain Science Institute, Wako, Saitama, Japan. ikedak@postman.riken.go.jp
authors.forename: K
authors.initials: K
authors.lastname: Ikeda
authors.forename: T
authors.initials: T
authors.lastname: Kobayashi
authors.forename: T
authors.initials: T
authors.lastname: Kumanishi
authors.forename: H
authors.initials: H
authors.lastname: Niki
authors.forename: R
authors.initials: R
authors.lastname: Yano
mesh_terms: D019900:3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer / Q000494:pharmacology*; D000698:Analgesia; D018712:Analgesics, Non-Narcotic / Q000494:pharmacology; D000701:Analgesics, Opioid / Q000494:pharmacology; D000818:Animals; D004305:Dose-Response Relationship, Drug; D051676:G Protein-Coupled Inwardly-Rectifying Potassium Channels; D051379:Mice; D008809:Mice, Inbred C3H; D008818:Mice, Neurologic Mutants; D009020:Morphine / Q000494:pharmacology*; D010147:Pain Measurement / Q000187:drug effects*; D015221:Potassium Channels / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D024661:Potassium Channels, Inwardly Rectifying; D011930:Reaction Time / Q000187:drug effects; D017473:Receptors, Opioid, kappa / Q000819:agonists / Q000378:metabolism; D017450:Receptors, Opioid, mu / Q000819:agonists / Q000378:metabolism
chemical_list: D018712:Analgesics, Non-Narcotic; D000701:Analgesics, Opioid; D051676:G Protein-Coupled Inwardly-Rectifying Potassium Channels; D015221:Potassium Channels; D024661:Potassium Channels, Inwardly Rectifying; D017473:Receptors, Opioid, kappa; D017450:Receptors, Opioid, mu; D019900:3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer; D009020:Morphine