Distinct Expression Profiles of p63 Variants during Urothelial Development and Bladder Cancer Progression

Karni-Schmidt, O., Castillo-Martin, M., HuaiShen, T., Gladoun, N., Domingo-Domenech, J., Sanchez-Carbayo, M., Li, Y., Lowe, S. W., Prives, C., Cordon-Cardo, C. (2011) Distinct Expression Profiles of p63 Variants during Urothelial Development and Bladder Cancer Progression. The American Journal of Pathology, 178 (3). pp. 1350-1360. ISSN 0002-9440

URL: http://www.ncbi.nlm.nih.gov/pubmed/21356385
DOI: 10.1016/j.ajpath.2010.11.061

Abstract

The TP63 gene, a member of the TP53 tumor suppressor gene family, can be expressed as at least six isoforms due to alternative promoter use and alternative splicing. The lack of p63 isoform-specific antibodies has limited the analysis of the biological significance of p63. We report a novel set of well-defined antibodies to examine p63 isoforms in mouse and human urothelium during embryogenesis and tumor progression, respectively. We provide evidence that basal and intermediate urothelial cells express p63 isoforms, with the TAp63 variant the first to be detected during development, whereas umbrella cells are characterized by a p63-negative phenotype. Notably, we report that p63-null mice develop a bladder with an abnormal urothelium, constituted by a single layer of cells that express uroplakin II and low molecular weight cytokeratins, consistent with an umbrella cell phenotype. Finally, analysis of 202 human bladder carcinomas revealed a new categorization of invasive tumors into basal-like (positive for [Delta]Np63 and high molecular weight cytokeratins and negative for low molecular weight cytokeratins) versus luminal-like (negative for [Delta]Np63 and high molecular weight cytokeratins and positive for low molecular weight cytokeratins) phenotypes, with [Delta]Np63 expression associated with an aggressive clinical course and poor prognosis. This study highlights the relevance of p63 isoforms in both urothelial development and bladder carcinoma progression, with [Delta]Np63 acting as an oncogene in certain invasive bladder tumors.

Item Type: Paper
Subjects: diseases & disorders > cancer
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification
diseases & disorders
bioinformatics > genomics and proteomics > genetics & nucleic acid processing
bioinformatics > genomics and proteomics
diseases & disorders > cancer > cancer types > bladder cancer
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > genes, structure and function
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > genes, structure and function > genes: types
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > genes, structure and function > genes: types > p63
diseases & disorders > cancer > cancer types
CSHL Authors:
Communities: CSHL Cancer Center Shared Resources > DNA Sequencing Service
CSHL Cancer Center Shared Resources > Microscopy Service
CSHL labs > Lowe lab
CSHL Cancer Center Program > Cancer Genetics
Depositing User: Matt Covey
Date: 2011
Date Deposited: 06 Feb 2013 20:51
Last Modified: 14 Oct 2015 18:37
PMCID: PMC3069841
Related URLs:
URI: http://repository.cshl.edu/id/eprint/27157

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