title: Decline in c-myc mRNA expression but not the induction of c-fos mRNA expression is associated with differentiation of SH-SY5Y human neuroblastoma cells.
abstract: The induction of differentiation in SH-SY5Y human neuroblastoma cells with 12-O-tetradecanoylphorbol-13-acetate (TPA) is accompanied by a rapid and a transient expression of c-fos mRNA and a down-regulation of c-myc mRNA. The TPA-induced expression of c-fos mRNA was inhibited by H-7, a specific inhibitor of protein kinase C (PK-C). Dioctanoylglycerol (DiC8) failed to induce differentiation of SH-SY5Y cells or to down-regulate c-myc mRNA but it did induce the expression of c-fos mRNA. Treatment of IMR-32 human neuroblastoma cells with TPA did not cause differentiation although c-fos mRNA was induced. Since PK-C in SH-SY5Y cells was activated by both TPA and DiC8 it is suggested that the activation of PK-C alone is not sufficient to induce differentiation in SH-SY5Y cells. The down-regulation of c-myc mRNA rather than the induction of c-fos mRNA seems to be associated with differentiation process in SH-SY5Y cells.
authors.affiliation: Department of Biochemistry and Pharmacy, Abo Academy, Finland.
authors.forename: A M
authors.initials: AM
authors.lastname: Jalava
authors.forename: J E
authors.initials: JE
authors.lastname: Heikkilä
authors.forename: K E
authors.initials: KE
authors.lastname: Akerman
mesh_terms: D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D002454:Cell Differentiation; D002460:Cell Line; D004075:Diglycerides / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D007546:Isoquinolines / Q000494:pharmacology; D009447:Neuroblastoma / Q000473:pathology*; D009857:Oncogenes; D010879:Piperazines / Q000494:pharmacology; D011493:Protein Kinase C / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D004075:Diglycerides; D007546:Isoquinolines; D010879:Piperazines; D012333:RNA, Messenger; C044295:1,2-dioctanoylglycerol; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate