p73 isoforms can induce T-cell factor-dependent transcription in gastrointestinal cells.

Tomkova K, Belkhiri A, El-Rifai W, Zaika AI
Cancer Res. 2004 64 (18): 6390-3

PMID: 15374945 · DOI:10.1158/0008-5472.CAN-04-2176

A new p53 family member, p73, and its isoform DeltaNp73 are increasingly recognized in cancer research as important players in tumorigenesis, as well as in chemotherapeutic drug sensitivity. Despite substantial structural similarities to p53, accumulating evidence suggests that p53 and p73 may play different roles in human tumorigenesis. In this study, we have investigated the role of p73 and DeltaNp73 in upper gastrointestinal tumorigenesis. Our results indicate that p73 and DeltaNp73 are frequently overexpressed in >60% of primary adenocarcinomas of the stomach and esophagus. We have demonstrated that this overexpression can lead to the suppression of p73 transcriptional and apoptotic activity in gastrointestinal cells. Moreover, it induces beta-catenin up-regulation and T-cell factor/lymphocyte enhancement factor-dependent transcription. Wild-type p53, but not mutant p53, can inhibit this effect. Our results demonstrate a novel mechanism for activation of beta-catenin in gastrointestinal tumors and support the concept that overexpression of p73 isoforms can play an important role in tumorigenesis.

MeSH Terms (24)

Adenocarcinoma Apoptosis beta Catenin Cell Line, Tumor Cell Transformation, Neoplastic Cytoskeletal Proteins DNA-Binding Proteins Esophageal Neoplasms Gene Expression Regulation, Neoplastic Genes, Tumor Suppressor Humans Nuclear Proteins Protein Isoforms RNA, Messenger Stomach Neoplasms TCF Transcription Factors Trans-Activators Transcriptional Activation Transcription Factor 7-Like 2 Protein Transcription Factors Transfection Tumor Protein p73 Tumor Suppressor Proteins Up-Regulation

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