title: Muscarinic cholinergic receptor-induced enhancement of PGE1-stimulated cAMP accumulation in neuroblastoma X glioma cells: prevention by pertussis toxin.
abstract: Chronic treatment of neuroblastoma X glioma hybrid cells (NG 108-15) with the muscarinic cholinergic agonist carbachol, which acutely inhibits adenylate cyclase, resulted in a 104 +/- 10% increase in PGE1-stimulated cAMP accumulation. Pretreatment of intact cells with pertussis toxin can structurally modify the inhibitory regulatory protein, Gi, by ADP-ribosylation and thus abolish the acute inhibition by carbachol. Pretreatment of the cells with pertussis toxin also resulted in a 27 +/- 8% increase in PGE1-stimulated cAMP accumulation. In the pertussis toxin-treated cells, chronic treatment with carbachol did not further enhance the PGE1 stimulation. These results suggest that functional Gi is required for the development of muscarinic cholinergic-induced enhancement of PGE1-stimulated cAMP accumulation.
mesh_terms: D000246:Adenosine Diphosphate Ribose / Q000378:metabolism; D037361:Adenylate Cyclase Toxin; D000262:Adenylyl Cyclases / Q000378:metabolism*; D000527:Alprostadil / Q000494:pharmacology*; D001285:Atropine / Q000494:pharmacology; D002217:Carbachol / Q000494:pharmacology; D002460:Cell Line; D000242:Cyclic AMP / Q000096:biosynthesis*; D004789:Enzyme Activation / Q000187:drug effects; D019204:GTP-Binding Proteins / Q000502:physiology*; D005910:Glioma; D009447:Neuroblastoma; D037342:Pertussis Toxin; D011976:Receptors, Muscarinic / Q000502:physiology*; D011982:Receptors, Prostaglandin / Q000502:physiology*; D010566:Virulence Factors, Bordetella / Q000494:pharmacology*
chemical_list: D037361:Adenylate Cyclase Toxin; D011976:Receptors, Muscarinic; D011982:Receptors, Prostaglandin; D010566:Virulence Factors, Bordetella; D000246:Adenosine Diphosphate Ribose; D001285:Atropine; D002217:Carbachol; D000242:Cyclic AMP; D037342:Pertussis Toxin; D019204:GTP-Binding Proteins; D000262:Adenylyl Cyclases; D000527:Alprostadil