title: Effect of retinoic acid on Nm/23 nucleoside diphosphate kinase and components of cyclic adenosine monophosphate-dependent signalling in human neuroblastoma cell lines.
abstract: The effects of retinoic acid on components of the cAMP-dependent signalling system were examined in two related human neuroblastoma cell lines SK-N-SH-F (SHF) and SK-N-SH-N (SHN). Retinoid treatment for a week significantly increased the concentration of intracellular cAMP and the levels of activity of protein kinase A and adenylate cyclase in both cell lines. Retinoic acid treatment also caused a very marked translocation of nucleoside diphosphate kinase from the cytosol to the membrane fraction. The increases in cyclic nucleotide and protein kinase A activity were observed to occur as early as within 1 and 2 days respectively and preceded or were concurrent with the onset of observable morphological differentiation. Results also indicated that agents which elevated intracellular cAMP caused neuronal differentiation and blunted retinoic acid-induced melanocytic differentiation in SHF cells. However, increases in cAMP brought about by treatment of SHF cells with retinoic acid alone were several-fold smaller and thus insufficient to induce neuritogenesis in these cells. The results as a whole indicate that one overall effect of retinoic acid treatment is to upgrade the activity of components of the cAMP-dependent signalling system in both neuroblastoma cell lines. However, retinoic acid causes the SH-F and SH-N cell lines to differentiate along different routes which means that the upgrading responses may be related to more general aspects of differentiation rather than to specific phenotype expression.
authors.affiliation: Department of Biochemistry, University of Ottawa, Canada.
authors.forename: G
authors.initials: G
authors.lastname: Pulido-Cejudo
authors.forename: R
authors.initials: R
authors.lastname: Slack
authors.forename: R L
authors.initials: RL
authors.lastname: Hébert
authors.forename: P
authors.initials: P
authors.lastname: Proulx
mesh_terms: D000262:Adenylyl Cyclases / Q000378:metabolism; D002454:Cell Differentiation / Q000187:drug effects; D002460:Cell Line / Q000187:drug effects; D000242:Cyclic AMP / Q000378:metabolism*; D017868:Cyclic AMP-Dependent Protein Kinases / Q000378:metabolism; D006801:Humans; D009447:Neuroblastoma / Q000378:metabolism; D009701:Nucleoside-Diphosphate Kinase / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects; D013997:Time Factors; D014212:Tretinoin / Q000494:pharmacology*
chemical_list: D014212:Tretinoin; D000242:Cyclic AMP; D017868:Cyclic AMP-Dependent Protein Kinases; D009701:Nucleoside-Diphosphate Kinase; D000262:Adenylyl Cyclases