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Double-negative feedback interaction between DNA methyltransferase 3A and microRNA-145 in the Warburg effect of

Songlin Zhang1, Meili Pei2, Zhen Li2

  • 1Department of Structural Heart Disease, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.

Cancer Science
|July 12, 2018
PubMed

Insights

MicroRNA-145 (miR-145) inhibits the Warburg effect in ovarian cancer by targeting HK2. A feedback loop between miR-145 and DNA methyltransferase 3A (DNMT3A) regulates this process, offering a potential therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Ovarian cancer is a lethal gynecological malignancy with a poor prognosis.
  • The Warburg effect, a metabolic shift in cancer cells, drives cancer progression.
  • MicroRNAs (miRs) are frequently dysregulated in cancers and linked to metabolic alterations.

Purpose of the Study:

  • To investigate the role of miR-145 in ovarian cancer.
  • To elucidate the relationship between miR-145, DNA methyltransferase 3A (DNMT3A), and the Warburg effect.
  • To identify potential therapeutic targets for ovarian cancer.

Main Methods:

  • Correlation analysis of miR-145 and DNMT3A expression.
  • Luciferase reporter assays to confirm direct targeting of DNMT3A mRNA by miR-145.
  • Methylation-specific PCR (MSP) assays to assess promoter methylation of the miR-145 precursor gene.
  • Functional assays to evaluate the impact of miR-145 and DNMT3A on the Warburg effect and HK2 expression.

Main Results:

  • miR-145 negatively correlated with DNMT3A expression in ovarian cancer.
  • miR-145 inhibited the Warburg effect by targeting hexokinase 2 (HK2).
  • A double-negative feedback loop exists between miR-145 and DNMT3A, where DNMT3A promotes the Warburg effect via miR-145 regulation.

Conclusions:

  • A feedback loop between miR-145 and DNMT3A is a key feature of the Warburg effect in ovarian cancer.
  • This regulatory axis represents a promising therapeutic target for improving ovarian cancer treatment.
  • Targeting this loop could offer a novel strategy for combating this lethal malignancy.
Keywords:
DNMT3AmethylationmiR-145ovarian cancerthe Warburg effect

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