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Published on: November 16, 2011

The type III TGF-beta receptor suppresses breast cancer progression

Mei Dong1, Tam How, Kellye C Kirkbride

  • 1Department of Medicine, Duke University Medical Center, Durham, North Carolina 27710, USA.

The Journal of Clinical Investigation
|December 13, 2006
PubMed

Insights

Loss of type III TGF-beta receptor (TbetaRIII) expression in breast cancer cells reduces tumor invasion and metastasis. Restoring TbetaRIII inhibits cancer progression, highlighting its role as a tumor suppressor.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • The transforming growth factor-beta (TGF-beta) signaling pathway plays a multifaceted role in mammary carcinogenesis.
  • The type III TGF-beta receptor (TbetaRIII), also known as betaglycan, is a coreceptor for TGF-beta signaling.

Purpose of the Study:

  • To investigate the role of TbetaRIII in breast cancer progression and metastasis.
  • To determine the clinical significance of TbetaRIII expression levels in breast cancer patients.

Main Methods:

  • Analysis of TbetaRIII expression in human breast cancers.
  • Correlation of TbetaRIII expression with loss of heterozygosity (LOH) at the TGFBR3 gene locus.
  • In vitro and in vivo experiments restoring TbetaRIII expression in breast cancer cells.
  • Assessment of tumor invasiveness, angiogenesis, and metastasis.
  • Investigation of the mechanism involving ectodomain shedding and soluble TbetaRIII.

Main Results:

  • Most human breast cancers exhibit loss of TbetaRIII expression, often associated with LOH of the TGFBR3 gene.
  • Decreased TbetaRIII expression correlates with advanced breast cancer progression and predicts poorer recurrence-free survival.
  • Restoration of TbetaRIII expression significantly inhibits breast cancer cell invasiveness, tumor invasion, angiogenesis, and metastasis.
  • TbetaRIII inhibits invasion and angiogenesis via ectodomain shedding, producing soluble TbetaRIII that sequesters TGF-beta.

Conclusions:

  • Loss of TbetaRIII expression is a frequent genetic event in breast cancer development, contributing to increased metastatic potential.
  • TbetaRIII acts as a tumor suppressor by inhibiting TGF-beta-driven invasion and angiogenesis.
  • TbetaRIII represents a potential therapeutic target for reducing breast cancer metastasis.

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