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SU6668 suppresses proliferation of triple negative breast cancer cells through down-regulating MTDH expression

Lu Wang1, Zhaozhe Liu1, Dongchu Ma2

  • 1Oncology Department, Cancer Treatment Center, General Hospital of Shenyang Military Region, Shenyang, P. R. China.

Cancer Cell International
|August 30, 2013
PubMed
Abstract

Insights

The tyrosine kinase inhibitor SU6668 suppresses triple-negative breast cancer (TNBC) cell proliferation by inducing polyploidization and inhibiting epithelial-mesenchymal transition (EMT). MTDH protein is identified as a potential therapeutic target in TNBC treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Multiple tyrosine kinase inhibitors, including SU6668, show therapeutic promise for hematological malignancies and solid tumors.
  • Triple-negative breast cancer (TNBC) remains a challenging subtype with limited targeted therapy options.

Purpose of the Study:

  • To investigate the effects of SU6668 on TNBC cell proliferation and explore its underlying molecular mechanisms.
  • To evaluate SU6668's impact on key proteins involved in cancer progression and metastasis.

Main Methods:

  • MDA-MB-231 TNBC cells were treated with varying concentrations of SU6668.
  • Cell proliferation was assessed using MTT assays and colony formation.
  • DNA ploidy, MTDH protein expression and distribution, and levels of VEGFR2, HIF-1α, E-cadherin, and SMA were analyzed.

Main Results:

  • SU6668 significantly inhibited MDA-MB-231 cell proliferation and induced polyploidization in a dose-dependent manner.
  • SU6668 treatment altered MTDH protein distribution, increasing cytoplasmic and decreasing nuclear localization.
  • Key proteins involved in angiogenesis and metastasis, VEGFR2, HIF-1α, MTDH, and SMA, were downregulated, while E-cadherin was upregulated.

Conclusions:

  • SU6668 exhibits anti-proliferative effects on TNBC cells, potentially through inducing polyploidization and inhibiting epithelial-mesenchymal transition (EMT).
  • MTDH protein plays a crucial role downstream of the VEGF/HIF-1α pathway in TNBC cells.
  • MTDH inhibition represents a potential therapeutic strategy for TNBC.

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