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Updated: Feb 1, 2026

Modeling Chemotherapy Resistant Leukemia In Vitro
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Published on: February 9, 2016

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[Down-Regulation of MiR-125b Reverses Drug Resistance of Doxorubicin-Resistant Leukemia Cells]

Yi-Min Deng1, Ai-Ling Luo2, Guang-Feng Li1

  • 1Department of Emergency, The First People's Hospital of Guangzhou, Guangzhou 510180, Guangdong Province, China.

Zhongguo Shi Yan Xue Ye Xue Za Zhi
|December 4, 2018
PubMed
Abstract

Insights

Down-regulating miR-125b reverses doxorubicin resistance in leukemia cells. This finding offers a potential new treatment strategy for drug-resistant leukemia patients.

Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • Drug resistance in leukemia poses a significant challenge to effective treatment.
  • MicroRNAs (miRNAs) play crucial roles in gene regulation and have emerged as potential therapeutic targets.

Purpose of the Study:

  • To investigate the role of miR-125b in doxorubicin resistance in leukemia cell lines.
  • To explore the potential of down-regulating miR-125b as a therapeutic strategy for drug-resistant leukemia.

Main Methods:

  • Real-time quantitative PCR (RT-qPCR) to measure miR-125b expression in sensitive and resistant cell lines.
  • Transfection experiments to up-regulate or inhibit miR-125b expression.
  • Cell viability assays (CCK-8) to assess drug response and calculate IC50 values.

Main Results:

  • miR-125b expression was significantly elevated in doxorubicin-resistant leukemia cell lines (HL-60/Dox, K562/Dox) compared to their sensitive counterparts.
  • Inhibition of miR-125b in resistant cells led to increased sensitivity to doxorubicin, evidenced by decreased proliferation.
  • Conversely, up-regulation of miR-125b in resistant cells resulted in decreased doxorubicin sensitivity.

Conclusions:

  • The expression of miR-125b is up-regulated in doxorubicin-resistant leukemia cells.
  • Down-regulation of miR-125b can effectively reverse doxorubicin resistance in leukemia cells.
  • Targeting miR-125b presents a promising therapeutic avenue for overcoming drug resistance in leukemia treatment.

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