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Clinicopathological Analysis of miRNA Expression in Breast Cancer Tissues by Using miRNA In Situ Hybridization
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Clinicopathological Analysis of miRNA Expression in Breast Cancer Tissues by Using miRNA In Situ Hybridization

Published on: June 7, 2016

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N-Myc and STAT Interactor regulates autophagy and chemosensitivity in breast cancer cells

Brandon J Metge1, Aparna Mitra2, Dongquan Chen3

  • 1Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, USA.

Scientific Reports
|July 7, 2015
PubMed

Insights

NMI expression in breast cancer cells drives autophagy and increases sensitivity to cisplatin. This occurs through activation of GSK3-beta and regulation of DRAM1, offering new therapeutic strategies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Loss of NMI (N-myc and STAT interactor) expression is observed in invasive breast cancers, correlating with increased invasiveness.
  • Previous studies demonstrated that NMI downregulation promotes epithelial-mesenchymal transition and enhances breast cancer cell invasion.
  • Restoration of NMI expression reduced tumor growth and key signaling pathways (Wnt, TGFβ/SMAD) in breast cancer models.

Purpose of the Study:

  • To investigate the role of NMI expression in driving autophagy in breast cancer cells.
  • To elucidate the molecular mechanisms by which NMI influences autophagy and cellular response to chemotherapy.
  • To determine if NMI-mediated autophagy sensitizes breast cancer cells to cisplatin treatment.

Main Methods:

  • Observation of autophagic vacuoles and LC3 processing in NMI-expressing breast cancer cells.
  • Assessment of cisplatin sensitivity in breast cancer cells with varying NMI expression levels.
  • Mechanistic studies involving GSK3-beta activation, TSC1/TSC2 complex, mTOR signaling, and DRAM1 regulation.
  • Analysis of NMI and DRAM1 co-expression in human breast cancer specimens using TCGA database.

Main Results:

  • NMI expression was found to induce autophagy, evidenced by autophagic vacuoles and LC3 processing.
  • NMI expression significantly increased the sensitivity of breast cancer cells to cisplatin.
  • NMI activates GSK3-beta, which in turn regulates mTOR signaling and influences autophagy.
  • NMI regulates DRAM1 (DNA-damage regulated autophagy modulator 1), a key autophagy component.
  • Concurrent expression of NMI and DRAM1 was observed in human breast cancer samples.

Conclusions:

  • NMI expression drives autophagy in breast cancer cells.
  • NMI sensitizes breast cancer cells to cisplatin treatment via a mechanism dependent on DRAM1-mediated autophagy.
  • NMI's regulation of GSK3-beta and DRAM1 offers potential therapeutic targets for breast cancer treatment.

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