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miR-200c inhibits breast cancer proliferation by targeting KRAS

Cailu Song1, Long-Zhong Liu2, Xiao-Qing Pei2

  • 1Department of Breast Oncology, Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, Guangdong, China.

Oncotarget
|September 23, 2015
PubMed

Insights

MicroRNA miR-200c acts as a tumor suppressor in breast cancer by downregulating KRAS. Low miR-200c levels correlate with poor patient survival, suggesting its therapeutic potential.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • MicroRNAs (miRNAs) play crucial roles in cancer development.
  • The miR-200c microRNA is implicated in various cancer types.
  • Understanding miR-200c's function in breast cancer is vital.

Purpose of the Study:

  • To investigate the expression, mechanism, and prognostic significance of miR-200c in breast cancer.
  • To elucidate the molecular targets and pathways regulated by miR-200c.
  • To evaluate miR-200c's potential as a therapeutic target.

Main Methods:

  • Quantitative real-time PCR (qRT-PCR) for expression analysis.
  • In situ hybridization (ISH) and microarrays for prognostic correlation.
  • Luciferase reporter assays to identify direct targets.
  • In vitro and in vivo (xenograft mouse model) experiments to assess functional impact.

Main Results:

  • miR-200c was significantly downregulated in breast cancer tissues and cell lines.
  • Low miR-200c expression correlated with poorer overall survival (OS) and disease-free survival (DFS).
  • miR-200c directly targets KRAS, inhibiting AKT and ERK pathways.
  • miR-200c suppressed breast cancer cell proliferation and survival in vitro and in vivo by repressing KRAS.

Conclusions:

  • miR-200c functions as a tumor suppressor in breast cancer.
  • The tumor-suppressive role of miR-200c is mediated through the inhibition of KRAS.
  • miR-200c represents a potential therapeutic target for breast cancer treatment.
Keywords:
KRASbreast cancermiR-200cmicroRNAproliferation

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