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[Arsenic trioxide induced p15INK4B gene expression in myelodysplastic syndrome cell line MUTZ-1]

Hongyan Tong1, Maofang Lin

  • 1The First Affiliated Hospital, Medical College of Zhejiang University, Hangzhou 310003, China.

Zhonghua Xue Ye Xue Za Zhi = Zhonghua Xueyexue Zazhi
|April 2, 2003
PubMed
Abstract

Insights

Arsenic trioxide (As(2)O(3)) reactivates the silenced p15 gene in cancer cells. This occurs through demethylation, potentially by inhibiting DNA methyltransferases DNMT3A and DNMT3B.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Epigenetics

Background:

  • Gene silencing through methylation is a hallmark of cancer.
  • The p15INK4B gene plays a crucial role in cell cycle regulation and is often epigenetically silenced in various cancers.
  • Arsenic trioxide (As(2)O(3)) has shown therapeutic potential in cancer treatment, but its precise molecular mechanisms require further elucidation.

Purpose of the Study:

  • To investigate the molecular mechanisms by which arsenic trioxide (As(2)O(3)) induces gene demethylation.
  • To determine the effect of As(2)O(3) on the expression of the p15INK4B gene and associated DNA methyltransferases (DNMTs) in cancer cells.

Main Methods:

  • Methylation-specific PCR (MSP) was used to detect p15INK4B gene methylation.
  • Reverse transcription PCR (RT-PCR) was employed to quantify the expression of p15, DNMT1, DNMT3A, and DNMT3B.
  • MTT assay was utilized to assess As(2)O(3)-induced growth inhibition in MUTZ-1 cells.

Main Results:

  • The p15INK4B gene was found to be methylated and non-expressed in MUTZ-1 cells.
  • Exposure to As(2)O(3) led to the recovery of p15INK4B gene expression.
  • As(2)O(3) significantly downregulated the mRNA levels of DNMT3A and DNMT3B in a dose-dependent manner, but not DNMT1.

Conclusions:

  • As(2)O(3) can activate the expression of the p15INK4B gene.
  • This activation is likely mediated through demethylation and/or inhibition of DNA methyltransferases DNMT3A and DNMT3B.

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