title: Identification of functional cAMP-dependent protein kinase in a 'neurite minus' mouse neuroblastoma cell line.
abstract: We have characterized and quantitated the level of cAMP-dependent protein kinase in the NS-20, N1E-115, N-18 and N1A-103 mouse neuroblastoma clonal cell lines, and we have correlated the occurrence of functional cAMP-dependent protein kinase with the dibutyryl cAMP-induced differentiated functions in these cells. Our results demonstrate the presence of functional cAMP-dependent protein kinase in extracts of all four cell lines examined, including the 'neurite minus' N1A-103 cell line. Dibutyryl cAMP induced neurite outgrowth and acetylcholinesterase activity in the NS-20, N1E-115 and N-18 neuroblastoma cell lines, but not in the N1A-103 cell line. However, dibutyryl cAMP caused a 2-3-fold increase in the R1 regulatory subunit protein and cAMP-phosphodiesterase activity in the 'neurite minus' N1A-103 cells in a manner similar to that of the other three 'neurite positive' cell lines. These results suggest that the biochemical lesion(s) subserving the neurite-minus phenotype of the N1A-103 cells may be distal to the activation of cAMP-dependent protein kinase and is in a biochemical pathway distinct from the induction of R1 regulatory subunit protein and cAMP-phosphodiesterase activity.
mesh_terms: D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000096:biosynthesis; D000110:Acetylcholinesterase / Q000096:biosynthesis; D000818:Animals; D003994:Bucladesine / Q000494:pharmacology; D002352:Carrier Proteins / Q000378:metabolism; D002454:Cell Differentiation / Q000187:drug effects; D002460:Cell Line; D004790:Enzyme Induction / Q000187:drug effects; D047908:Intracellular Signaling Peptides and Proteins; D051379:Mice; D009447:Neuroblastoma / Q000378:metabolism* / Q000473:pathology; D011494:Protein Kinases / Q000378:metabolism*
chemical_list: D002352:Carrier Proteins; D047908:Intracellular Signaling Peptides and Proteins; C015482:protein kinase modulator; D003994:Bucladesine; D011494:Protein Kinases; D000110:Acetylcholinesterase; D015105:3',5'-Cyclic-AMP Phosphodiesterases