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

Katarina Tomkova, Abbes Belkhiri, Wael El-Rifai, Alexander I. Zaika

Research output: Contribution to journalArticle

31 Scopus citations

Abstract

A new p53 family member, p73, and its isoform ΔNp73 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 ΔNp73 in upper gastrointestinal tumorigenesis. Our results indicate that p73 and ΔNp73 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 β-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 β-catenin in gastrointestinal tumors and support the concept that overexpression of p73 isoforms can play an important role in tumorigenesis.

Original languageEnglish (US)
Pages (from-to)6390-6393
Number of pages4
JournalCancer Research
Volume64
Issue number18
DOIs
StatePublished - Sep 15 2004
Externally publishedYes

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ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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