title: Effect of nerve growth factor and fibroblast growth factor on SCG10 and c-fos expression and neurite outgrowth in protein kinase C-depleted PC12 cells.
abstract: The role of protein kinase C (PKC) in mediating nerve growth factor (NGF) or basic fibroblast growth factor (bFGF)-stimulated SCG10 and c-fos expression as well as neurite outgrowth was studied in PC12 cells. Activators of PKC such as phorbol 12-myristate 13-acetate (PMA) or 1-oleoyl 2-acetyl glycerol mimicked the stimulatory effect of NGF and bFGF on SCG10 mRNA levels. Induction involved a protein synthesis-dependent mechanism and was maximal within 12-24 h of exposure. Chronic treatment of the cells with PMA for up to 8 days resulted in a substantial decrease (approximately 90%) in total PKC activity in the continued presence of PMA. PKC depletion did not affect NGF- or bFGF-stimulated SCG10 mRNA induction and bFGF-stimulated c-fos mRNA induction. However, NGF-stimulated c-fos mRNA induction was attenuated. In addition, induction of neurite outgrowth was not abolished in PKC-depleted cells. The results imply that PKC is not involved in NGF- and bFGF-stimulated SCG10 mRNA induction and neurite outgrowth. Furthermore, while the effect of bFGF on c-fos mRNA induction is PKC-independent, that of NGF is mediated by PKC-dependent and -independent pathways.
authors.affiliation: Department of Biochemistry, Tel Aviv University, Ramat Aviv, Israel.
authors.forename: O
authors.initials: O
authors.lastname: Sigmund
authors.forename: Z
authors.initials: Z
authors.lastname: Naor
authors.forename: D J
authors.initials: DJ
authors.lastname: Anderson
authors.forename: R
authors.initials: R
authors.lastname: Stein
mesh_terms: D000310:Adrenal Gland Neoplasms; D000818:Animals; D001369:Axons / Q000187:drug effects / Q000502:physiology*; D002460:Cell Line; D004075:Diglycerides / Q000494:pharmacology; D005346:Fibroblast Growth Factors / Q000494:pharmacology*; D005786:Gene Expression Regulation / Q000187:drug effects; D009414:Nerve Growth Factors / Q000494:pharmacology*; D010673:Pheochromocytoma; D015240:Phorbol 12,13-Dibutyrate / Q000494:pharmacology*; D011493:Protein Kinase C / Q000037:antagonists & inhibitors*; D011505:Protein-Tyrosine Kinases / Q000235:genetics*; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D016760:Proto-Oncogene Proteins c-fos; D011519:Proto-Oncogenes / Q000235:genetics*; D012333:RNA, Messenger / Q000187:drug effects / Q000235:genetics; D051381:Rats; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D014158:Transcription, Genetic / Q000187:drug effects
chemical_list: D004075:Diglycerides; D009414:Nerve Growth Factors; D011518:Proto-Oncogene Proteins; D016760:Proto-Oncogene Proteins c-fos; D012333:RNA, Messenger; D015240:Phorbol 12,13-Dibutyrate; D005346:Fibroblast Growth Factors; C038237:1-oleoyl-2-acetylglycerol; D011505:Protein-Tyrosine Kinases; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate