p63 and p73 isoform expression in non-small cell lung cancer and corresponding morphological normal lung tissue.

Department of Clinical and Biological Sciences, University of Turin, Turin, Italy.
Journal of thoracic oncology: official publication of the International Association for the Study of Lung Cancer (Impact Factor: 4.55). 03/2011; 6(3):473-81. DOI: 10.1097/JTO.0b013e31820b86b0
Source: PubMed

ABSTRACT The TP73 and TP63 genes are members of the p53 tumor suppressor family and are expressed in different N-terminal isoforms either with proapoptotic (transactivation domain, TA) and antiapoptotic (N-terminally truncated, ΔN) function. Unlike p53, the role of p73 and p63 in tumor is controversial. It has been recently hypothesized that altered ΔN:TA expression ratio, rather than single isoform overexpression, plays a role in the pathogenesis of many diseases, including lung cancer.
Isoform-specific, real-time polymerase chain reaction and immunohistochemistry analysis on matched cancer and corresponding normal tissues from surgically resected non-small cell lung cancers (NSCLCs) have been performed aiming to explore the expression levels of each p63 and p73 N-terminal isoforms and their ΔN:TA expression ratio.
For both p63 and p73, a N-terminal isoform-specific modulation that alter ΔN:TA isoform balance was identified. In particular, ΔNp63 isoform was significantly up-modulated, whereas TAp63 was slightly down-modulated in NSCLC specimens. Likewise, Δ2p73 and Δ2/3p73 were up-modulated, whereas ΔNp73 and ΔN'p73 isoforms were down-modulated. Moreover, a higher TAp63 and ΔN'p73 transcripts expression, detected in the normal tissue surrounding the tumors, correlates with poor patient outcome, representing independent prognostic factors for overall survival (ΔN'p73: p = 0.049, hazard ratio = 3.091, 95% confidence interval = 1.005-9.524 and TAp63: p = 0.001, hazard ratio = 8.091, 95% confidence interval = 2.254-29.05).
Our findings suggest that p63 and p73 altered ΔN:TA expression ratio occurs in NSCLC likely contributing to the molecular pathogenesis of this tumor.

  • [Show abstract] [Hide abstract]
    ABSTRACT: Background:TAp63 is a tumour-suppressor protein that is often underexpressed in various types of cancer. It has been shown to activate gene transcription depending on the transcription domain and to be closely related with metastasis. In this study, we demonstrate that TAp63 suppresses metastasis in colon cancer cells through microRNA-133b.Methods:We evaluated the correlation of TAp63 and miR-133b with HT-29 and SW-620 cells and investigated the roles of TAp63 in the expression of RhoA, E-cadherin and vimentin. We further investigated the roles of TAp63-mediated invasion and migration of colon cancer cells.Results:TAp63 expression is downregulated in colon cancer, and microRNA-133b is a transcriptional target of TAp63. Furthermore, microRNA-133b is essential for the inhibitory effects of TAp63 on RhoA, E-cadherin and vimentin. Moreover, TAp63 inhibits cell migration and invasion through microRNA-133b. Correspondingly, the inhibitory effect of TAp63 on RhoA, E-cadherin, vimentin, migration and invasion can be blocked by the microRNA-133b inhibitor.Conclusions:TAp63 and microRNA-133b were able to suppress the metastasis of colon cancer. Both TAp63 and microRNA-133b may be potential biomarkers for diagnosis in colon cancer metastasis and may provide unique therapeutic targets for this common malignancy.British Journal of Cancer advance online publication, 4 March 2014; doi:10.1038/bjc.2014.118
    British Journal of Cancer 03/2014; · 5.08 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The specialisation of mammalian cells in time and space requires genes associated with specific pathways and functions to be co-ordinately expressed. Here we have combined a large number of publically available microarray datasets derived from human primary cells and analysed large correlation graphs of these data. Using the network analysis tool BioLayout Express3D we identify robust co-associations of genes expressed in a wide variety of cell lineages. We discuss the biological significance of a number of these associations, in particular the coexpression of key transcription factors with the genes that they are likely to control. We consider the regulation of genes in human primary cells and specifically in the human mononuclear phagocyte system. Of particular note is the fact that these data do not support the identity of putative markers of antigen-presenting dendritic cells, nor classification of M1 and M2 activation states, a current subject of debate within immunological field. We have provided this data resource on the BioGPS web site ( and on (
    BMC Genomics 09/2013; 14(1):632. · 4.40 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The sinonasal tract may give rise to a broad range of neoplasms that share a "small round blue cell" tumor (SBRCT) appearance on routine histology, but treatment strategies depend on precise tumor classification. Immunohistochemistry for p63 is often employed in the sinonasal SRBCT differential diagnosis because it is highly sensitive for squamous cell carcinoma (SCC). However, p63 staining may be observed in other tumor types, a potential diagnostic pitfall. P40 is a more squamous-specific isoform of p63, and it may be more useful in distinguishing poorly differentiated SCC from its mimickers in the sinonasal tract. Immunohistochemistry for p40 and p63 was performed on 171 sinonasal neoplasms with SRBCT morphology: 73 SCCs (67 poorly differentiated, non-keratinizing, or basaloid types and 6 nasopharyngeal carcinomas), 46 esthesioneuroblastomas, 11 sinonasal undifferentiated carcinomas (SNUCs), 11 lymphomas, 9 melanomas, 7 alveolar rhabdomyosarcomas, 4 solid adenoid cystic carcinomas, 4 NUT midline carcinomas, 4 primitive neuroectodermal tumors (PNETs), and 2 small cell carcinomas. P40 was positive in 72 of 73 SCCs, and showed a diffuse distribution in all but one positive case. P40 immunoexpression was also observed in 13 of 46 (28 %) esthesioneuroblastomas, 6 of 11 (55 %) SNUCs, 2 of 4 (50 %) adenoid cystic carcinomas, 3 of 4 (75 %) NUT midline carcinomas, 1 of 2 (50 %) small cell carcinomas, and 1 of 4 (25 %) PNETs; in the non-SCC tumors, p40 staining was focal in most cases. P63 was positive in every p40-positive tumor. In addition, a p63+/p40- phenotype was seen 5 of 11 (45 %) lymphomas, 4 of 7 (57 %) alveolar rhabdomyosarcomas, 1 of 4 (25 %) PNETs, and 3 of 46 (7 %) esthesioneuroblastomas. All sinonasal melanomas were negative for both markers. In the sinonasal SRBCT differential diagnosis, both p40 and p63 are highly sensitive for SCC, but p40 is more specific. Notably, p40 is consistently negative in lymphomas and alveolar rhabdomyosarcomas, two tumors that are frequently p63-positive. It must be remembered, however, that even diffuse p40 immunostaining is not entirely specific for the squamous phenotype, and therefore it should be utilized as part of an immunohistochemical panel.
    Head and Neck Pathology 10/2013;