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X-linked ectodermal dysplasia receptor is downregulated in breast cancer via promoter methylation

Vasu Punj1, Hittu Matta, Preet M Chaudhary

  • 1Department of Medicine, Division of Hematology-Oncology, Hillman Cancer Center, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, Pennsylvania 15213-1863, USA. punjv@upmc.edu

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|February 11, 2010
PubMed
Abstract

Insights

X-linked ectodermal dysplasia receptor (XEDAR) is downregulated in breast cancer due to promoter methylation, hindering EDA-A2-induced cell death. Restoring XEDAR may offer a novel breast cancer treatment approach.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • The X-linked ectodermal dysplasia receptor (XEDAR) is a tumor necrosis factor receptor family member that binds ectodysplasin-A2 (EDA-A2) and induces apoptosis.
  • Understanding XEDAR's role in breast cancer is crucial for developing new therapeutic strategies.

Purpose of the Study:

  • To investigate the tumor-suppressive potential of XEDAR in breast cancer development.
  • To determine if XEDAR downregulation is associated with breast cancer progression.

Main Methods:

  • Quantitative real-time PCR and immunoblotting were used to analyze XEDAR expression in breast cancer cell lines and tissues.
  • CpG island analysis and methylation-specific PCR assessed the XEDAR gene promoter methylation status.
  • The effect of 5-aza-2'-deoxycytidine on XEDAR expression and apoptosis sensitivity was examined.

Main Results:

  • XEDAR expression was downregulated in most breast cancer cell lines and tumor samples, unlike EDA-A2.
  • Loss of XEDAR expression correlated with hypermethylation of its promoter.
  • Ectopic XEDAR expression induced apoptosis and reduced colony formation in MDA-MB-231 cells.
  • 5-aza-2'-deoxycytidine treatment restored XEDAR expression and sensitized cells to EDA-A2-induced apoptosis.

Conclusions:

  • XEDAR is downregulated in breast cancer via promoter methylation, potentially promoting tumor development by inhibiting EDA-A2-induced cell death.
  • XEDAR functions as a novel breast tumor suppressor gene.
  • Restoring XEDAR expression using DNA demethylating agents presents a potential therapeutic strategy for breast cancer.

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