title: Vasoactive intestinal polypeptide stimulates cyclic AMP production in mouse N1E-115 neuroblastoma cells: modulation by a protein kinase C activator and ionomycin.
abstract: In this study, we investigated the vasoactive intestinal polypeptide (VIP)-stimulated cAMP production and its interaction with protein kinase C activation and elevation of intracellular Ca2+ in N1E-115 neuroblastoma cells. VIP treatment caused a 55-fold increase in cAMP accumulation. Addition of 4 beta-phorbol 12-myristate 13-acetate reduced VIP- but not forskolin-stimulated cAMP response. In comparison, ionomycin potentiated both VIP- and forskolin-induced cAMP accumulation. Our results indicate that VIP stimulates cAMP accumulation in N1E-115 cells, and that although activation of protein kinase C inhibits the VIP-stimulated cAMP response, elevation of intracellular Ca2+ potentiates this signaling pathway.
authors.affiliation: Department of Physiology, Faculty of Medicine, University of Alberta, Edmonton, Canada.
authors.forename: T
authors.initials: T
authors.lastname: Inukai
authors.forename: C L
authors.initials: CL
authors.lastname: Chik
authors.forename: A K
authors.initials: AK
authors.lastname: Ho
mesh_terms: D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002273:Carcinogens / Q000494:pharmacology; D005576:Colforsin / Q000494:pharmacology; D000242:Cyclic AMP / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D004357:Drug Synergism; D004789:Enzyme Activation; D015759:Ionomycin / Q000494:pharmacology*; D007546:Isoquinolines / Q000494:pharmacology; D007700:Kinetics; D051379:Mice; D009447:Neuroblastoma; D010703:Phorbol Esters / Q000494:pharmacology; D010879:Piperazines / Q000494:pharmacology; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D014407:Tumor Cells, Cultured; D014660:Vasoactive Intestinal Peptide / Q000494:pharmacology*
chemical_list: D002273:Carcinogens; D007546:Isoquinolines; D010703:Phorbol Esters; D010879:Piperazines; D005576:Colforsin; C008876:phorbol-12,13-didecanoate; D014660:Vasoactive Intestinal Peptide; D015759:Ionomycin; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D000242:Cyclic AMP; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate; D002118:Calcium; D015056:1-Methyl-3-isobutylxanthine