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microRNA-29a regulates liver tumor-initiating cells expansion via Bcl-2 pathway

Shaohua Song1, Keyan Sun1, Junfeng Dong1

  • 1Organ Transplantation Center, Changzheng Hospital, Second Military Medical University, Shanghai, 200003, China.

Experimental Cell Research
|December 21, 2019
PubMed

Insights

MicroRNAs (miRNAs) regulate liver cancer. This study shows miR-29a downregulation promotes hepatocellular carcinoma (HCC) growth and predicts sorafenib treatment response, making it a potential therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Hepatology

Background:

  • MicroRNAs (miRNAs) are key regulators in hepatocellular carcinoma (HCC) development, progression, and drug resistance.
  • Limited identification and clinical application of specific miRNAs for HCC management.
  • Tumor-initiating cells (T-ICs) are crucial drivers of HCC initiation and progression.

Purpose of the Study:

  • To investigate the role of miR-29a in liver tumor-initiating cells (T-ICs) and its impact on hepatocellular carcinoma (HCC) progression.
  • To elucidate the molecular mechanism underlying miR-29a function in HCC.
  • To evaluate the potential of miR-29a as a predictive biomarker for sorafenib treatment response in HCC.

Main Methods:

  • Functional assays (knockdown and overexpression) to assess miR-29a's effect on T-ICs self-renewal and tumorigenesis.
  • Mechanism studies involving 3'UTR binding assays to identify miR-29a targets.
  • Validation in human HCC tissues and patient-derived xenografts (PDXs).
  • Correlation analysis of miR-29a and Bcl-2 expression in HCC samples.

Main Results:

  • miR-29a is downregulated in liver T-ICs and its knockdown enhances T-ICs self-renewal and tumorigenesis.
  • Forced miR-29a expression inhibits liver T-ICs self-renewal and tumorigenesis.
  • miR-29a directly targets and downregulates Bcl-2 mRNA in liver T-ICs.
  • miR-29a expression levels correlate with Bcl-2 in human HCC tissues.
  • miR-29a expression predicts hepatoma cell response to sorafenib, with higher miR-29a indicating greater sensitivity.

Conclusions:

  • miR-29a plays a critical role in regulating liver T-ICs expansion and hepatocellular carcinoma (HCC) tumorigenesis.
  • The miR-29a/Bcl-2 axis is a key mechanism in HCC development.
  • miR-29a serves as a promising predictive biomarker for sorafenib treatment efficacy in HCC patients.
  • Targeting miR-29a offers a potential strategy for HCC prevention and intervention.
Keywords:
Bcl-2Drug resistanceHepatocellular carcinomaLiver tumor-initiating cellsmiR-29a

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