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Environmental Modulations of the Number of Midbrain Dopamine Neurons in Adult Mice
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Epidermal growth factor receptor: a novel target of the Wnt/beta-catenin pathway in liver

Xinping Tan1, Udayan Apte, Amanda Micsenyi

  • 1Department of Pathology, University of Pittsburgh, School of Medicine, Pennsylvania 15261, USA.

Gastroenterology
|July 14, 2005
PubMed
Abstract

Insights

Wnt/beta-catenin pathway activation in liver increases hepatocyte proliferation and liver size. Epidermal growth factor receptor (EGFR) is a direct target, and its inhibition may reduce liver overgrowth in certain conditions.

Area of Science:

  • Hepatology
  • Molecular Biology
  • Cancer Research

Background:

  • Wnt/beta-catenin signaling is crucial for liver development, regeneration, and cancer.
  • Understanding its regulation and mechanisms in the liver is essential.

Purpose of the Study:

  • To elucidate the regulation and mechanism of Wnt/beta-catenin pathway in liver.
  • To investigate the role of beta-catenin overexpression in liver growth and gene expression.

Main Methods:

  • Generation and characterization of liver-specific beta-catenin-overexpressing transgenic mice.
  • Analysis of liver morphology, proliferation, apoptosis, and gene expression via histology and microarray.
  • Reporter assays to confirm gene activation and inhibition studies.

Main Results:

  • Transgenic livers showed increased beta-catenin in hepatocytes, leading to a 15-20% increase in liver weight due to enhanced hepatocyte proliferation.
  • Microarray analysis revealed differential expression of ~400 genes, including upregulation of epidermal growth factor receptor (EGFR) and activated Stat3.
  • EGFR promoter analysis identified a T-cell factor-binding site, confirming EGFR as a direct target of the Wnt pathway. EGFR inhibition reduced liver size in transgenic mice.
  • Hepatoblastomas frequently showed co-upregulation of beta-catenin and EGFR.

Conclusions:

  • Overexpression of beta-catenin induces a hepatotrophic effect in vivo, increasing basal hepatocyte proliferation.
  • Epidermal growth factor receptor (EGFR) is a direct target of the Wnt/beta-catenin pathway in the liver.
  • EGFR activation contributes to the mitogenic effects of beta-catenin, suggesting EGFR inhibition as a potential therapeutic strategy for beta-catenin-driven liver overgrowth.

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