title: c-MYC activates protein kinase A (PKA) by direct transcriptional activation of the PKA catalytic subunit beta (PKA-Cbeta) gene.
abstract: The c-MYC proto-oncogene encodes a ubiquitous transcription factor involved in the control of cell growth and differentiation and broadly implicated in tumorigenesis. Understanding the function of c-MYC and its role in cancer depends upon the identification of c-MYC target genes. Here we show that c-MYC induces the activity of Protein Kinase A (PKA), a key effector of cAMP-mediated signal transduction, by inducing the transcription of the gene encoding the PKA catalytic subunit beta (PKA-Cbeta). c-MYC-mediated induction of PKA-Cbeta gene transcription occurs in multiple tissues, is independent of cell proliferation and is mediated by direct binding of c-MYC to the PKA-Cbeta gene promoter sequences. Constitutive expression of PKA-Cbeta in Rat1A cells induces their transformation, and c-MYC-induced transformation can be reverted by pharmacological inhibition of PKA, suggesting that up-regulation of PKA is critical for c-MYC-associated tumorigenesis. These results indicate that, by activating PKA, c-MYC can provide endogenous activation of the cAMP signal transduction pathway independently of extracellular signals.
authors.affiliation: Institute for Cancer Genetics, Columbia University, New York, NY 10032, USA.
authors.forename: Kou-Juey
authors.initials: KJ
authors.lastname: Wu
authors.forename: Michela
authors.initials: M
authors.lastname: Mattioli
authors.forename: Herbert C
authors.initials: HC
authors.lastname: Morse
authors.forename: Riccardo
authors.initials: R
authors.lastname: Dalla-Favera
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000378:metabolism; D002455:Cell Division; D002461:Cell Line, Transformed; D002471:Cell Transformation, Neoplastic / Q000235:genetics; D000242:Cyclic AMP / Q000502:physiology; D054751:Cyclic AMP-Dependent Protein Kinase Catalytic Subunits; D017868:Cyclic AMP-Dependent Protein Kinases / Q000037:antagonists & inhibitors / Q000737:chemistry / Q000235:genetics*; D004790:Enzyme Induction; D005347:Fibroblasts / Q000473:pathology; D005786:Gene Expression Regulation; D017930:Genes, Reporter; D006801:Humans; D007527:Isoenzymes / Q000037:antagonists & inhibitors / Q000737:chemistry / Q000235:genetics*; D008156:Luciferases / Q000096:biosynthesis; D051379:Mice; D008822:Mice, Transgenic; D020411:Oligonucleotide Array Sequence Analysis; D009928:Organ Specificity; D011401:Promoter Regions, Genetic; D000090063:Proto-Oncogene Mas; D016271:Proto-Oncogene Proteins c-myc / Q000502:physiology*; D051381:Rats; D011993:Recombinant Fusion Proteins / Q000502:physiology; D015290:Second Messenger Systems; D014158:Transcription, Genetic
chemical_list: D007527:Isoenzymes; C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas; D016271:Proto-Oncogene Proteins c-myc; D011993:Recombinant Fusion Proteins; D000242:Cyclic AMP; D008156:Luciferases; D054751:Cyclic AMP-Dependent Protein Kinase Catalytic Subunits; D017868:Cyclic AMP-Dependent Protein Kinases; C463959:protein kinase A Calpha