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Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
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Specific inhibition of one DNMT1-including complex influences tumor initiation and progression

Mathilde Cheray1, Romain Pacaud, Arulraj Nadaradjane

  • 1Centre de Recherche en Cancérologie Nantes-Angers, INSERM, U892, Equipe Apoptose et progression tumorale, Equipe labellisée Ligue Nationale Contre le Cancer, 8 quai moncousu, BP7021, Nantes, 44007, France. pierre-francois.cartron@univ-nantes.fr.

Clinical Epigenetics
|July 2, 2013
PubMed
Abstract

Insights

Targeting the DNMT1/DMAP1 interaction with specific peptides offers a novel cancer therapy approach. This strategy sensitizes cancer cells to chemotherapy and enhances treatment efficacy, unlike other DNMT inhibitors.

Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • DNA methyltransferase (DNMT) inhibitors reactivate tumor suppressor genes for cancer therapy.
  • However, non-specific DNMT inhibitors can paradoxically promote tumorigenesis through oncogene activation and genomic instability.
  • Developing specific DNMT inhibitors is crucial for effective and safe cancer treatment.

Purpose of the Study:

  • To investigate the therapeutic potential of targeting specific protein interactions of DNMT1.
  • To compare the effects of various DNMT1 interaction inhibitors on tumor growth and treatment response.

Main Methods:

  • Utilized peptides designed to disrupt specific DNMT1 protein interactions.
  • Evaluated the in vivo effects of these peptides and non-specific DNMT inhibitors in a mouse glioma model.
  • Assessed the impact on cancer cell sensitization to chemotherapy and irradiation.

Main Results:

  • Non-specific DNMT inhibitors and peptides disrupting DNMT1/PCNA, DNMT1/EZH2, DNMT1/HDAC1, DNMT1/DNMT3b, and DNMT1/HP1 interactions promoted tumorigenesis.
  • A peptide disrupting the DNMT1/DMAP1 interaction did not affect tumor growth but sensitized cells to chemotherapy/irradiation.
  • This DNMT1/DMAP1-targeting peptide enhanced the efficacy of temozolomide treatment.

Conclusions:

  • The DNMT1/DMAP1 interaction represents a promising anti-cancer target.
  • Disrupting this interaction offers a new strategy for designing more effective DNMT inhibitors.
  • This approach enhances cancer therapy by sensitizing cells to existing treatments.

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