Abstract
β-catenin is involved in both cell-cell interactions and wnt pathway-dependent cell fate determination through its interactions with E-cadherin and TCF/LEF transcription factors, respectively. Cytoplasmic/nuclear levels of β-catenin are important in regulated transcriptional activation of TCF/LEF target genes. Normally, these levels are kept low by proteosomal degradation of β-catenin through Axin1- and APC-dependent phosphorylation by CKI and GSK-3β. Deregulation of β-catenin degradation results in its aberrant accumulation, often leading to cancer. Accordingly, aberrant accumulation of β-catenin is observed at high frequency in many cancers. This accumulation correlates with either mutational activation of CTNNB1 (β-catenin) or mutational inactivation of APC and Axin1 genes in some tumors. However, there are many tumors that display β-catenin accumulation in the absence of a mutation in these genes. Thus, there must be additional sources for aberrant β-catenin accumulation in cancer cells. Here, we provide experimental evidence that wild-type β-catenin accumulates in hepatocellular carcinoma (HCC) cells in association with mutational inactivation of p53 gene. We also show that worldwide p53 and β-catenin mutation rates are inversely correlated in HCC. These data suggest that inactivation of p53 is an important cause of aberrant accumulation of β-catenin in cancer cells.
Original language | English (US) |
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Pages (from-to) | 7971-7980 |
Number of pages | 10 |
Journal | Oncogene |
Volume | 21 |
Issue number | 52 |
DOIs | |
State | Published - Nov 14 2002 |
Keywords
- Hepatocellular carcinoma
- Mutation
- p53
- wnt pathway
- β-catenin
ASJC Scopus subject areas
- Molecular Biology
- Genetics
- Cancer Research