title: Dysfunction of the TP53 tumor suppressor gene in lymphoid malignancies.
abstract: Mutations of the TP53 gene and dysregulation of the TP53 pathway are important in the pathogenesis of many human cancers, including lymphomas. Tumor suppression by p53 occurs via both transcription-dependent activities in the nucleus by which p53 regulates transcription of genes involved in cell cycle, DNA repair, apoptosis, signaling, transcription, and metabolism; and transcription-independent activities that induces apoptosis and autophagy in the cytoplasm. In lymphoid malignancies, the frequency of TP53 deletions and mutations is lower than in other types of cancer. Nonetheless, the status of TP53 is an independent prognostic factor in most lymphoma types. Dysfunction of TP53 with wild-type coding sequence can result from deregulated gene expression, stability, and activity of p53. To overcome TP53 pathway inactivation, therapeutic delivery of wild-type p53, activation of mutant p53, inhibition of MDM2-mediated degradation of p53, and activation of p53-dependent and -independent apoptotic pathways have been explored experimentally and in clinical trials. We review the mechanisms of TP53 dysfunction, recent advances implicated in lymphomagenesis, and therapeutic approaches to overcoming p53 inactivation.
authors.affiliation: Department of Hematopathology, University of Texas MD Anderson Cancer Center, Houston, USA.
authors.forename: Zijun Y
authors.initials: ZY
authors.lastname: Xu-Monette
authors.forename: L Jeffrey
authors.initials: LJ
authors.lastname: Medeiros
authors.forename: Yong
authors.initials: Y
authors.lastname: Li
authors.forename: Robert Z
authors.initials: RZ
authors.lastname: Orlowski
authors.forename: Michael
authors.initials: M
authors.lastname: Andreeff
authors.forename: Carlos E
authors.initials: CE
authors.lastname: Bueso-Ramos
authors.forename: Timothy C
authors.initials: TC
authors.lastname: Greiner
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: McDonnell
authors.forename: Ken H
authors.initials: KH
authors.lastname: Young
mesh_terms: D006801:Humans; D008214:Lymphocytes / Q000276:immunology* / Q000378:metabolism; D008223:Lymphoma / Q000235:genetics* / Q000276:immunology* / Q000378:metabolism; D035683:MicroRNAs / Q000235:genetics; D015398:Signal Transduction / Q000276:immunology*; D014158:Transcription, Genetic / Q000276:immunology; D016159:Tumor Suppressor Protein p53 / Q000235:genetics* / Q000378:metabolism
chemical_list: D035683:MicroRNAs; C495901:TP53 protein, human; D016159:Tumor Suppressor Protein p53