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Genome-wide Screen for miRNA Targets Using the MISSION Target ID Library
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MicroRNA-320a acts as a tumor suppressor by targeting BCR/ABL oncogene in chronic myeloid leukemia

Zhu Xishan1, Lin Ziying1, Du Jing2

  • 1Clinical Research Center, Affiliated Hospital of Guangdong Medical College, 0086-027-7398722, China.

Scientific Reports
|August 1, 2015
PubMed

Insights

MicroRNA-320a acts as a tumor suppressor in chronic myeloid leukemia (CML). It inhibits cancer cell migration, invasion, and proliferation by targeting the BCR/ABL oncogene, reducing CML progression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Regulation

Background:

  • Epithelial-mesenchymal transition (EMT) and microRNA (miRNA) dysregulation are linked to cancer development and progression, including chronic myeloid leukemia (CML).
  • Reduced expression of miR-320a was observed in K562 cells and CML cancer stem cells.

Purpose of the Study:

  • To investigate the role of miR-320a in CML pathogenesis.
  • To determine the molecular mechanisms by which miR-320a affects CML cell behavior and EMT.

Main Methods:

  • Quantitative real-time PCR to assess miR-320a expression.
  • Cell migration, invasion, and proliferation assays.
  • Western blotting to analyze protein expression of EMT markers and signaling pathway components (PI3K/AKT/NF-κB).
  • Target validation by direct targeting of BCR/ABL oncogene.

Main Results:

  • miR-320a expression was decreased in CML cells.
  • miR-320a inhibited K562 cell migration, invasion, proliferation, and promoted apoptosis by targeting BCR/ABL.
  • miR-320a suppressed phosphorylation of PI3K, AKT, and NF-κB, which was reversed by BCR/ABL overexpression.
  • miR-320a reduced mesenchymal markers (fibronectin, vimentin, N-cadherin) and increased epithelial marker (E-cadherin), reversing EMT.

Conclusions:

  • miR-320a functions as a novel tumor suppressor in CML.
  • miR-320a attenuates CML cell migration, invasion, proliferation, and EMT by downregulating BCR/ABL oncogene expression.

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