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The human Lgl polarity gene, Hugl-2, induces MET and suppresses Snail tumorigenesis

A Kashyap1, T Zimmerman, N Ergül

  • 1First Department of Internal Medicine, Johannes Gutenberg University, Mainz, Germany.

Oncogene
|May 15, 2012
PubMed

Insights

The human lethal giant larvae homologue 2 (Hugl-2) gene suppresses Snail-driven cancer progression. Restoring Hugl-2 expression reverses cancer cell phenotypes and reduces tumor growth, offering therapeutic potential.

Area of Science:

  • Cell Biology
  • Cancer Research
  • Molecular Biology

Background:

  • Lethal giant larvae (Lgl) proteins are crucial for cell polarity and act as tumor suppressors.
  • Aberrant Snail expression drives epithelial-to-mesenchymal transition, promoting aggressive cancer phenotypes.
  • Mechanisms to suppress Snail-induced cancer progression remain largely unknown.

Purpose of the Study:

  • To identify novel suppressors of Snail-driven epithelial-to-mesenchymal transition and cancer progression.
  • To investigate the role of the polarity gene, human lethal giant larvae homologue 2 (Hugl-2), in Snail-mediated carcinogenesis.

Main Methods:

  • Investigated Hugl-2 gene regulation by Snail using promoter analysis and reporter assays.
  • Assessed the phenotypic effects of Hugl-2 induction in cancer cells with constitutive Snail expression.
  • Evaluated Hugl-2's impact on Snail nuclear localization and target gene binding in vivo and in vitro.

Main Results:

  • Identified Hugl-2 as a polarity gene downregulated by Snail through E-box binding in its promoter.
  • Demonstrated that re-expression of Hugl-2 in Snail-expressing cells reverses cancer phenotypes, including morphology, motility, and tumor growth.
  • Showed that Hugl-2 reduces Snail nuclear localization, thereby inhibiting Snail's transcriptional activity.

Conclusions:

  • Hugl-2 functions as a suppressor of Snail-induced carcinogenesis, reversing key cancer-promoting phenotypes.
  • Hugl-2 acts within the Snail regulatory network, offering a potential therapeutic target to impede cancer progression.
  • Restoring Hugl-2 expression presents a promising strategy for cancer prevention and treatment.

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