title: Modulation of CCK mRNA in cell lines in response to isoproterenol and retinoic acid.
abstract: Regulation of cholecystokinin (CCK) expression was studied in the human neuroepithelioma cell line SK-N-MCIXC and the rat medullary thyroid carcinoma cell line WE 4/2. The cells were treated with the beta-adrenergic agonist isoproterenol and retinoic acid, a natural derivative of vitamin A, which plays a role in cell growth and proliferation. Levels of CCK mRNA were determined after 6, 12 and 24 h drug treatments, with Northern blot analysis using human CCK riboprobes. In WE 4/2 cells no differences were observed in CCK mRNA levels, between control and isoproterenol treated cells, after 6, 12 or 24 h treatments. In SK-N-MCIXC cells isoproterenol increased CCK mRNA levels at all time points examined, the beta-adrenergic antagonist propranolol blocked this effect. SK-N-MCIXC cells were also treated with actinomycin D or cycloheximide in combination with isoproterenol. Actinomycin D decreased CCK mRNA levels. Cycloheximide increased CCK mRNA levels when compared to isoproterenol acting alone. Retinoic acid did not affect CCK mRNA levels in WE 4/2 cells. In SK-N-MCIXC cells, retinoic acid consistently decreased CCK mRNA level. CCK mRNA levels in SK-N-MCIXC cells treated with retinoic acid combined with either isoproterenol or phorbol-12-myristate-13 acetate, were not significantly different from cells treated with retinoic acid alone.
authors.affiliation: Department of Biological Sciences, Purdue University Calumet, Hammond, IN 46323, USA.
authors.forename: B L
authors.initials: BL
authors.lastname: Mania-Farnell
authors.forename: I W
authors.initials: IW
authors.lastname: Botros
authors.forename: T P
authors.initials: TP
authors.lastname: Davis
mesh_terms: D000318:Adrenergic beta-Agonists / Q000494:pharmacology*; D000818:Animals; D001345:Autoradiography; D015152:Blotting, Northern; D002766:Cholecystokinin / Q000096:biosynthesis* / Q000235:genetics; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D017403:In Situ Hybridization; D007545:Isoproterenol / Q000494:pharmacology*; D007641:Keratolytic Agents / Q000494:pharmacology*; D015347:RNA Probes; D012333:RNA, Messenger / Q000096:biosynthesis*; D051381:Rats; D014212:Tretinoin / Q000494:pharmacology*; D014407:Tumor Cells, Cultured
chemical_list: D000318:Adrenergic beta-Agonists; D007641:Keratolytic Agents; D015347:RNA Probes; D012333:RNA, Messenger; D014212:Tretinoin; D002766:Cholecystokinin; D007545:Isoproterenol