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DNA methylation-associated inactivation of TGFbeta-related genes DRM/Gremlin, RUNX3, and HPP1 in human cancers

M Suzuki1, H Shigematsu, D S Shames

  • 1Hamon Center for Therapeutic Oncology Research, University of Texas Southwestern Medical Center, Bld NB, Room 8206, 6000 Harry Hines Blvd., Dallas, TX 75390, USA. smakoto@faculty.chiba-u.jp

British Journal of Cancer
|October 20, 2005
PubMed

Insights

Aberrant DNA methylation silences tumour suppressor genes, DRM/Gremlin, HPP1, and RUNX3, disrupting transforming growth factor beta (TGFbeta) signalling in cancers. This epigenetic silencing is linked to poorer patient prognosis.

Area of Science:

  • Cancer Biology
  • Epigenetics
  • Molecular Oncology

Background:

  • The transforming growth factor beta (TGFbeta) signalling pathway is crucial in cellular processes and frequently deregulated in human cancers.
  • Tumour suppressor genes, including DRM/Gremlin, HPP1, and RUNX3, play vital roles in regulating TGFbeta signalling and preventing cancer development.

Purpose of the Study:

  • To investigate the role of aberrant DNA methylation in silencing tumour suppressor genes (DRM/Gremlin, HPP1, RUNX3) involved in TGFbeta signalling in various human malignancies.
  • To determine the association between the methylation status of these genes, their expression levels, and patient prognosis.

Main Methods:

  • Analysis of DRM/Gremlin mRNA expression in 44 cancer cell lines.
  • Assessment of promoter methylation status for DRM/Gremlin, HPP1, and RUNX3 in 44 cancer cell lines and 511 primary tumours.
  • Treatment of cell lines with a methylation inhibitor to assess mRNA expression restoration.

Main Results:

  • Loss of DRM/Gremlin mRNA expression in cancer cell lines correlated with DNA methylation, which could be reversed by methylation inhibitors.
  • Promoter methylation frequencies for the three genes varied significantly across adult and paediatric tumours.
  • Methylation of DRM/Gremlin was more prevalent in lung tumours from smokers.
  • Aberrant methylation of all three genes showed an inverse correlation with prognosis in bladder and prostate cancer patients.

Conclusions:

  • Aberrant DNA methylation is a key mechanism for deregulating TGFbeta-related tumour suppressor genes (DRM/Gremlin, HPP1, RUNX3) in human cancers.
  • The epigenetic silencing of these genes contributes to cancer development and is associated with adverse patient outcomes.

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