title: Evidence for a metabostatic opioid kappa-receptor inhibiting pertussis toxin-sensitive metabotropic glutamate receptor-currents in Xenopus oocytes.
abstract: Glutamate evoked pertussis toxin-sensitive currents in Xenopus oocytes expressing metabotropic glutamate receptor subtype 1 (mGluR1) and exogenous Gi1 alpha. The mGluR1-currents were completely blocked by U-73122, a phospholipase C (PLC) inhibitor and by niflumic acid, a chloride channel blocker. In the oocyte further coinjected with poly(A)+ RNA from the guinea pig cerebellum, the mGluR1-currents were inhibited by U-50488H, an opioid kappa-agonist, and this inhibition was blocked by norbinaltorphimine, an opioid kappa-antagonist. These findings suggest that the mRNA encoding a novel subtype of opioid kappa-receptor which inhibits Gi1-PLC-mediated currents is present in guinea pig cerebellar poly(A)+ fractions.
mesh_terms: D019900:3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer; D000700:Analgesics / Q000494:pharmacology; D000818:Animals; D002462:Cell Membrane / Q000187:drug effects / Q000502:physiology; D002531:Cerebellum / Q000378:metabolism; D004963:Estrenes / Q000494:pharmacology; D005260:Female; D018698:Glutamic Acid / Q000494:pharmacology; D006168:Guinea Pigs; D007700:Kinetics; D046911:Macromolecular Substances; D008564:Membrane Potentials / Q000187:drug effects; D009865:Oocytes / Q000187:drug effects / Q000502:physiology*; D018408:Patch-Clamp Techniques; D037342:Pertussis Toxin; D010726:Phosphodiesterase Inhibitors / Q000494:pharmacology; D011759:Pyrrolidines / Q000494:pharmacology; D011760:Pyrrolidinones / Q000494:pharmacology; D018094:Receptors, Metabotropic Glutamate / Q000096:biosynthesis / Q000187:drug effects / Q000502:physiology*; D017473:Receptors, Opioid, kappa / Q000819:agonists* / Q000037:antagonists & inhibitors; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000187:drug effects / Q000378:metabolism; D010566:Virulence Factors, Bordetella / Q000494:pharmacology*; D014982:Xenopus laevis
chemical_list: D000700:Analgesics; D004963:Estrenes; D046911:Macromolecular Substances; D010726:Phosphodiesterase Inhibitors; D011759:Pyrrolidines; D011760:Pyrrolidinones; D018094:Receptors, Metabotropic Glutamate; D017473:Receptors, Opioid, kappa; D011994:Recombinant Proteins; D010566:Virulence Factors, Bordetella; C060229:1-(6-((3-methoxyestra-1,3,5(10)-trien-17-yl)amino)hexyl)-1H-pyrrole-2,5-dione; C074854:U 73343; D018698:Glutamic Acid; D019900:3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer; D037342:Pertussis Toxin