title: Co-expressions of different opioid receptor types differentially modulate their signaling via G(16).
abstract: Combinations of two different types of opioid receptors - delta-, kappa-, mu-opioid receptors (DOR, KOR, and MOR) and opioid receptor-like receptor 1 (ORL(1)) - were co-expressed with the alpha subunit of G(16) in COS-7 cells, and the ability of various selective agonists to induce activation of phospholipase Cbeta was examined. Nociceptin/orphanin FQ-induced response was enhanced when ORL(1) was co-expressed with MOR or KOR but not DOR. The kappa-agonist U50,488H induced a modest inositol phosphate formation when KOR was expressed alone or with MOR, but the response was attenuated when co-expressing with either DOR or ORL(1). It is suggested that the co-expressions of two different opioid receptor types indeed modify their downstream signaling events.
authors.affiliation: Department of Biochemistry, Molecular Neuroscience Center and Biotechnology Research Institute, Hong Kong University of Science and Technology, Hong Kong, China.
authors.forename: Maurice K C
authors.initials: MK
authors.lastname: Ho
authors.forename: David C
authors.initials: DC
authors.lastname: New
authors.forename: Yung H
authors.initials: YH
authors.lastname: Wong
mesh_terms: D019900:3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer / Q000494:pharmacology; D000700:Analgesics / Q000494:pharmacology; D018712:Analgesics, Non-Narcotic / Q000494:pharmacology; D000818:Animals; D044482:Benzeneacetamides; D019556:COS Cells; D043802:GTP-Binding Protein alpha Subunits, Gq-G11; D015870:Gene Expression / Q000502:physiology; D020962:Heterotrimeric GTP-Binding Proteins / Q000378:metabolism; D007527:Isoenzymes / Q000378:metabolism; D018847:Opioid Peptides / Q000494:pharmacology; D054799:Phospholipase C beta; D011485:Protein Binding / Q000187:drug effects / Q000502:physiology; D011759:Pyrrolidines / Q000494:pharmacology; D011957:Receptors, Opioid / Q000235:genetics* / Q000378:metabolism; D017465:Receptors, Opioid, delta / Q000235:genetics / Q000378:metabolism; D017473:Receptors, Opioid, kappa / Q000235:genetics / Q000378:metabolism; D017450:Receptors, Opioid, mu / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction / Q000502:physiology*; D010738:Type C Phospholipases / Q000378:metabolism; D000094942:Nociceptin Receptor; D000097629:Nociceptin
chemical_list: D019900:3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer; D000700:Analgesics; D018712:Analgesics, Non-Narcotic; D044482:Benzeneacetamides; D043802:GTP-Binding Protein alpha Subunits, Gq-G11; D020962:Heterotrimeric GTP-Binding Proteins; D007527:Isoenzymes; D018847:Opioid Peptides; D054799:Phospholipase C beta; D011759:Pyrrolidines; D011957:Receptors, Opioid; D017465:Receptors, Opioid, delta; D017473:Receptors, Opioid, kappa; D017450:Receptors, Opioid, mu; D010738:Type C Phospholipases; D000094942:Nociceptin Receptor; D000097629:Nociceptin; C112631:G protein alpha 16; C045444:U 69593