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J Hepatol. 2005 Jun;42(6):842-9. Epub 2005 Apr 8.

Activation of the canonical Wnt/beta-catenin pathway confers growth advantages in c-Myc/E2F1 transgenic mouse model of liver cancer.

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  • 1Laboratory of Experimental Carcinogenesis, Division of Basic Sciences, National Cancer Institute, National Institutes of Health, Building 37, Room 4146A, 37 Convent Drive MSC 4262, Bethesda, MD 20892-4262, USA.

Abstract

BACKGROUND/AIMS:

Previously, we showed that activation of the beta-catenin/Wnt pathway is a dominant event during c-Myc/E2F1 hepatocarcinogenesis. Majority of c-Myc/E2F1 HCCs displayed nuclear accumulation of beta-catenin in the absence of beta-catenin mutations, suggesting that alterations in other members of the Wnt pathway might be responsible for nuclear localization of beta-catenin. Here, we investigated the mechanisms responsible for nuclear translocation of wild-type beta-catenin and addressed the potential contribution of the Wnt pathway in c-Myc/E2F1 hepatocarcinogenesis.

METHODS:

Status of the members of the Wnt pathway was determined through microsatellite and Western blot analysis.

RESULTS:

Majority of c-Myc/E2F1 HCCs exhibited multiple abnormalities in the Wnt pathway regardless of the presence of beta-catenin mutations. The observed abnormalities included overexpression of Wnt-1, Frizzled 1 and 2 receptors, Dishevelled-1, downregulation of Secreted frizzled-related protein-1, GSK-3beta inactivation, microsatellite instability at the Axin locus as well as induction of beta-catenin target genes, such as glutamine synthetase, glutamate transporter-1, and Wisp-1. HCCs with beta-catenin activation displayed significantly higher proliferation rate and larger tumor size when compared with beta-catenin negative tumors.

CONCLUSIONS:

The data demonstrate that multiple abnormalities in the members of the Wnt pathway lead to nuclear accumulation of beta-catenin and suggest that activation of Wnt pathway provides proliferative advantages in c-Myc/E2F1-driven hepatocarcinogenesis.

PMID:
15885355
[PubMed - indexed for MEDLINE]
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