Modulators of cyclic AMP in monolayer cultures of Y-79 retinoblastoma cells: partial characterization of the response with VIP and glucagon.
VIP markedly stimulates intracellular cAMP accumulation in the human retinoblastoma Y-79 cell line. cAMP increased about 5-fold above the basal level with 10(-8)M VIP and reached a maximum level (about 70-fold increase) with 2 X 10(-6)M VIP. Glucagon at 6 X 10(-8)M significantly increased cAMP accumulation with a maximal response at 4 X 10(-7)M. Secretin was only effective at micromolar concentrations. Glucagon at 2 X 10(-6)M had a synergistic effect with VIP at 2 X 10(-8)M. Of other substances tested, L-isoproterenol (25-fold increase) and PGE1 (4-fold increase) were most effective. These results demonstrate that VIP and glucagon modulate cAMP accumulation in Y-79 cells and provide a model for studying the effect of these substances on function of neuronal and on malignant cells in vitro.
D002460:Cell Line; D000242:Cyclic AMP / Q000378:metabolism*; D004357:Drug Synergism; D005134:Eye Neoplasms / Q000378:metabolism*; D005934:Glucagon / Q000494:pharmacology*; D006801:Humans; D007545:Isoproterenol / Q000494:pharmacology; D011458:Prostaglandins E / Q000494:pharmacology; D012175:Retinoblastoma / Q000378:metabolism*; D012633:Secretin / Q000494:pharmacology; D014660:Vasoactive Intestinal Peptide / Q000494:pharmacology*
D011458:Prostaglandins E; D012633:Secretin; D014660:Vasoactive Intestinal Peptide; D005934:Glucagon; D000242:Cyclic AMP; D007545:Isoproterenol