title: Attenuation of nociceptin/orphanin FQ-induced signaling by N-methyl-D-aspartate in neuronal cells.
abstract: Acute incubation of NMDA with neuroblastoma x glioma hybrid (NG108-15) cells or neuroblastoma SK-N-SH cells produced significant attenuation of nociceptin/orphanin FQ (N/OFQ)-induced activation of G protein and inhibition of adenylyl cyclase. The attenuation of N/OFQ signaling by NMDA was dose-dependent, blockable by NMDA antagonists, and not observed in cells lacking NMDA receptors, indicating that the effect of NMDA is mediated by the NMDA receptor. Furthermore, NMDA antagonist pretreatment greatly attenuated N/OFQ-induced acute homologous desensitization of ORL1. Interestingly, the signaling induced by etorphine, an opioid agonist of wide spectrum, was sensitive to NMDA treatment in NG108-15 but insensitive in SK-N-SH cells, suggesting differential modulation of opioid signaling by NMDA. The attenuation effects of NMDA on mu opioid receptor-mediated signaling were also observed.
authors.affiliation: Shanghai Institute of Cell Biology and Shanghai Research Center of Life Sciences, Chinese Academy of Sciences.
authors.forename: J
authors.initials: J
authors.lastname: Zhao
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
authors.forename: S M
authors.initials: SM
authors.lastname: Xin
authors.forename: L
authors.initials: L
authors.lastname: Ma
authors.forename: G
authors.initials: G
authors.lastname: Pei
mesh_terms: D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D000818:Animals; D005576:Colforsin / Q000494:pharmacology; D000242:Cyclic AMP / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D019204:GTP-Binding Proteins / Q000378:metabolism; D005910:Glioma; D016244:Guanosine 5'-O-(3-Thiotriphosphate) / Q000378:metabolism; D006801:Humans; D006822:Hybrid Cells; D007700:Kinetics; D051379:Mice; D016202:N-Methylaspartate / Q000494:pharmacology*; D009292:Narcotic Antagonists; D009447:Neuroblastoma; D009474:Neurons / Q000187:drug effects / Q000502:physiology*; D018847:Opioid Peptides / Q000494:pharmacology*; D051381:Rats; D011957:Receptors, Opioid / Q000819:agonists / Q000187:drug effects / Q000502:physiology; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology*; D000094942:Nociceptin Receptor; D000097629:Nociceptin
chemical_list: D015056:1-Methyl-3-isobutylxanthine; D005576:Colforsin; D000242:Cyclic AMP; D019204:GTP-Binding Proteins; D016244:Guanosine 5'-O-(3-Thiotriphosphate); D016202:N-Methylaspartate; D009292:Narcotic Antagonists; D018847:Opioid Peptides; D011957:Receptors, Opioid; D000094942:Nociceptin Receptor; D000097629:Nociceptin