
pmid: 10913351
N-myc oncogene amplification is frequent in human neuroblastoma and predicts poor prognosis, but the molecular consequences have remained obscure. We report here that enhanced N-myc expression correlates with low or undetectable expression of activin A, but not other closely related members of the transforming growth factor-beta superfamily. N-myc interacts with the activin A promoter, eventually inducing down-regulation of activin A mRNA and protein. This study demonstrates for the first time N-myc-induced down-regulation of a gene implicated in signal transduction. Down-regulation of activin A could deprive neuroblastomas from a signal with growth-inhibitory activities toward the tumor and its stroma and thereby permit neuroblastoma progression.
Retinoblastoma/*metabolism/pathology, Transcription, Genetic, Molecular Sequence Data, Down-Regulation, Peptides/metabolism, Transfection, Kidney, Transcription, Genetic/drug effects, Cell Line, Proto-Oncogene Proteins c-myc, *Prostatic Secretory Proteins, Neuroblastoma, Inhibins/genetics/*metabolism, Proto-Oncogene Proteins c-myc/genetics/*metabolism/pharmacology, Genes, Reporter, Sequence Analysis, Protein, Neuroblastoma/*metabolism/pathology, Humans, Inhibins, Amino Acid Sequence, Promoter Regions, Genetic, Promoter Regions, Genetic/drug effects, Kidney/cytology/*metabolism, Down-Regulation/drug effects/*physiology, Gene Amplification, Retinoblastoma, Prostatic Secretory Proteins, Culture Media, Conditioned/metabolism, Activins, Clone Cells, Culture Media, Conditioned, Transforming Growth Factor beta/biosynthesis, Peptides
Retinoblastoma/*metabolism/pathology, Transcription, Genetic, Molecular Sequence Data, Down-Regulation, Peptides/metabolism, Transfection, Kidney, Transcription, Genetic/drug effects, Cell Line, Proto-Oncogene Proteins c-myc, *Prostatic Secretory Proteins, Neuroblastoma, Inhibins/genetics/*metabolism, Proto-Oncogene Proteins c-myc/genetics/*metabolism/pharmacology, Genes, Reporter, Sequence Analysis, Protein, Neuroblastoma/*metabolism/pathology, Humans, Inhibins, Amino Acid Sequence, Promoter Regions, Genetic, Promoter Regions, Genetic/drug effects, Kidney/cytology/*metabolism, Down-Regulation/drug effects/*physiology, Gene Amplification, Retinoblastoma, Prostatic Secretory Proteins, Culture Media, Conditioned/metabolism, Activins, Clone Cells, Culture Media, Conditioned, Transforming Growth Factor beta/biosynthesis, Peptides
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