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MicroRNA-200a promotes anoikis resistance and metastasis by targeting YAP1 in human breast cancer

San-Jian Yu1, Jing-Ying Hu, Xia-Ying Kuang

  • 1Breast Cancer Institute, Department of Breast Surgery, Cancer Hospital/Cancer Institute, Shanghai Medical College, Fudan University, Shanghai, PR China.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|January 24, 2013
PubMed
Abstract

Insights

MicroRNA-200a (miR-200a) enhances breast cancer cell survival, preventing anoikis and promoting metastasis. It targets YAP1, a key factor in anoikis resistance and tumor spread.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Metastasis Research

Background:

  • Metastasis is a complex, multi-step process involving tumor cell dissociation, invasion, and colonization of distant sites.
  • MicroRNA-200a (miR-200a) is implicated in the metastatic cascade of various cancers.
  • Anoikis, a form of programmed cell death, is a critical hurdle for cancer cells to overcome during metastasis.

Purpose of the Study:

  • To investigate the role of miR-200a in anoikis resistance in breast cancer.
  • To determine if miR-200a promotes breast cancer metastasis by enhancing anoikis resistance.

Main Methods:

  • Quantitative real-time PCR (qRT-PCR) to assess miR-200a expression.
  • In vitro anoikis assays using breast cancer cells with miR-200a mimic or inhibitor transfection.
  • Luciferase assays, colony formation assays, and in vivo animal studies to identify miR-200a targets and mechanisms.

Main Results:

  • Overexpression of miR-200a increased anoikis resistance, while inhibition suppressed it in breast cancer cells.
  • Yes-associated protein 1 (YAP1) was identified as a direct target of miR-200a.
  • miR-200a-mediated targeting of YAP1 decreased proapoptotic proteins, conferring anoikis resistance and promoting metastasis in vivo.
  • YAP1 knockdown mimicked miR-200a overexpression effects; YAP1 restoration reversed them.
  • Inverse correlation between YAP1 and miR-200a expression in clinical specimens; miR-200a associated with distant metastasis.

Conclusions:

  • miR-200a acts as an anoikis suppressor in breast cancer.
  • miR-200a significantly contributes to breast cancer metastasis through anoikis resistance.

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