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Cyclophosphamide perturbs cytosine methylation in Jurkat-T cells through LSD1-mediated stabilization of DNMT1 protein

Jing Zhang1, Bifeng Yuan, Fan Zhang

  • 1Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an 710062, P. R. China.

Chemical Research in Toxicology
|October 20, 2011
PubMed

Insights

Cyclophosphamide temporarily increases global DNA cytosine methylation in leukemia cells by affecting DNMT1 protein stability. This epigenetic alteration in cancer cells returns to normal levels after 8 days.

Area of Science:

  • Epigenetics
  • Cancer Biology
  • Molecular Pharmacology

Background:

  • Aberrant DNA cytosine methylation is a hallmark of cancer development.
  • Chemotherapeutic agents can influence epigenetic modifications, impacting cancer progression.
  • Understanding these drug-induced epigenetic changes is crucial for developing effective cancer therapies.

Purpose of the Study:

  • To investigate the effects of common chemotherapeutic agents on DNA cytosine methylation in Jurkat-T acute lymphoblastic leukemia cells.
  • To identify which agents cause the most significant perturbations in global DNA methylation.
  • To elucidate the molecular mechanisms underlying drug-induced methylation changes.

Main Methods:

  • Treatment of Jurkat-T cells with six different antitumor agents.
  • Assessment of global DNA cytosine methylation levels over time.
  • Analysis of DNA methyltransferase 1 (DNMT1) protein and mRNA expression.
  • Investigation of DNMT1 protein stability regulation by lysine methylation and associated enzymes like LSD1.

Main Results:

  • Cyclophosphamide induced the most significant increase in global DNA cytosine methylation after 24 hours.
  • Long-term cyclophosphamide treatment showed a time-dependent increase in methylation, returning to normal by day 8.
  • Increased DNMT1 protein levels correlated with increased LSD1 protein and decreased DNMT1 K142 methylation.
  • DNMT1 mRNA levels did not significantly increase, suggesting post-transcriptional regulation.

Conclusions:

  • Cyclophosphamide temporarily alters global DNA cytosine methylation in leukemia cells.
  • The observed changes are mediated by the regulation of DNMT1 protein stability through lysine methylation.
  • These findings highlight a novel mechanism by which chemotherapy impacts epigenetic regulation in cancer cells.

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