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MicroRNA-221 sensitizes chronic myeloid leukemia cells to imatinib by targeting STAT5

Xiaoxiao Jiang1, Yanhong Cheng1, Chaojie Hu1

  • 1a Central Laboratory , Anhui Provincial Hospital, Anhui Medical University , Hefei , China.

Leukemia & Lymphoma
|December 6, 2018
PubMed

Insights

MicroRNAs (miRNAs) regulate tumor drug resistance. This study found reduced miR-221 in imatinib-resistant chronic myeloid leukemia (CML), implicating the miR-221-STAT5 axis in CML treatment sensitivity.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • MicroRNAs (miRNAs) play critical roles in tumor development and drug resistance.
  • Chronic myeloid leukemia (CML) drug resistance is a significant clinical challenge.
  • STAT5 signaling is implicated in CML pathogenesis and treatment response.

Purpose of the Study:

  • To investigate the role of STAT5-related microRNAs in CML drug resistance.
  • To elucidate the mechanism by which miR-221 affects imatinib sensitivity in CML.

Main Methods:

  • Quantitative real-time reverse-transcription polymerase chain reaction (qRT-PCR) to assess miRNA and gene expression.
  • Dual-luciferase reporter assays to validate direct targeting of STAT5 by miR-221.
  • Cell line models (K562, K562/G) and patient-derived cells to study imatinib sensitivity.

Main Results:

  • miR-221 expression was significantly decreased in imatinib-resistant CML cells (K562/G) and patients with treatment failure.
  • STAT5 expression was inversely correlated with miR-221 levels.
  • STAT5 was confirmed as a direct target of miR-221.
  • Restoring miR-221 or knocking down STAT5 enhanced imatinib sensitivity in K562/G cells by altering the Bcl2: Bax ratio.

Conclusions:

  • The miR-221-STAT5 axis is a key regulator of imatinib sensitivity in CML.
  • Targeting the miR-221-STAT5 pathway may offer a therapeutic strategy to overcome CML drug resistance.
Keywords:
STAT5chronic myeloid leukemiadrug-resistancemiR-221

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