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DACH1 inhibits SNAI1-mediated epithelial-mesenchymal transition and represses breast carcinoma metastasis

F Zhao1, M Wang1, S Li1

  • 1School of Life Science and Biotechnology, Dalian University of Technology, Dalian, China.

Oncogenesis
|March 17, 2015
PubMed

Insights

Dachshund homologue 1 (DACH1) suppresses breast cancer metastasis by inhibiting SNAI1, thereby activating E-cadherin expression. This discovery reveals a new mechanism regulating cancer progression and offers potential therapeutic targets.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Epithelial-mesenchymal transition (EMT) is crucial for cancer progression and metastasis, but its transcriptional repression mechanisms are unclear.
  • Dachshund homologue 1 (DACH1) loss correlates with invasive breast cancer and poor prognosis, yet its role in metastasis is poorly understood.

Purpose of the Study:

  • To elucidate the mechanism by which DACH1 regulates breast cancer cell morphology, epithelial-mesenchymal transition (EMT), and metastasis.
  • To investigate the interaction between DACH1 and key EMT regulators, specifically SNAI1 and SNAI2, and its effect on E-cadherin expression.

Main Methods:

  • Overexpression and silencing of DACH1 in breast cancer cell lines (ZR-75-30, MCF-7, T47D) to assess morphological and migratory changes.
  • Co-immunoprecipitation and chromatin immunoprecipitation assays to study DACH1-SNAI1 interaction and binding to the E-cadherin promoter.
  • In vivo metastasis assays using a mouse model (4T1/Luc cells in BALB/c mice).
  • Analysis of human breast cancer tissue samples for correlation between DACH1, E-cadherin, and SNAI1 expression.

Main Results:

  • DACH1 overexpression promoted epithelial morphology, increased E-cadherin, and suppressed migration/invasion; DACH1 silencing induced opposite effects.
  • DACH1 directly interacted with SNAI1 (not SNAI2) and inhibited its transcriptional activity on the E-cadherin promoter.
  • DACH1 overexpression significantly reduced tumor metastasis and growth in a mouse model.
  • Human breast cancer tissues showed a positive correlation between DACH1 and E-cadherin expression in SNAI1-positive cases.

Conclusions:

  • DACH1 acts as a suppressor of EMT and metastasis in breast cancer by directly inhibiting SNAI1 and reactivating E-cadherin.
  • The DACH1-SNAI1 interaction represents a novel regulatory pathway for E-cadherin expression, impacting breast cancer progression.
  • DACH1 levels correlate with metastatic potential and E-cadherin status in human breast cancers, highlighting its prognostic significance.

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