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Discovery of epigenetically masked tumor suppressor genes in endometrial cancer

Noriyuki Takai1, Norihiko Kawamata, Christine S Walsh

  • 1Division of Hematology/Oncology, Cedars-Sinai Medical Center/University of California at Los Angeles School of Medicine, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA.

Molecular Cancer Research : MCR
|May 12, 2005
PubMed

Insights

Researchers identified two novel tumor suppressor genes, Tazarotene-induced gene-1 (Tig1) and CCAAT/enhancer binding protein-alpha (C/ebpalpha), epigenetically silenced in endometrial cancer. Reinstating these genes may offer a new therapeutic strategy for this cancer.

Area of Science:

  • Oncology
  • Epigenetics
  • Molecular Biology

Background:

  • Epigenetic silencing of tumor suppressor genes is a key mechanism in cancer development.
  • Identifying novel epigenetically silenced tumor suppressor genes is crucial for understanding endometrial cancer and developing targeted therapies.

Purpose of the Study:

  • To identify novel tumor suppressor genes epigenetically silenced in human endometrial cancers.
  • To investigate the role of Tazarotene-induced gene-1 (Tig1) and CCAAT/enhancer binding protein-alpha (C/ebpalpha) as potential tumor suppressors in endometrial cancer.

Main Methods:

  • Global gene expression analysis of endometrial cancer cells treated with epigenetic modifying agents (5-aza-2'-deoxycytidine and suberoylanilide bishydroxamide).
  • Screening of over 22,000 genes, followed by microarray analysis, real-time RT-PCR, and CpG island analysis.
  • Bisulfite sequencing, methylation-specific PCR, and chromatin immunoprecipitation to assess gene methylation and histone acetylation.
  • Forced expression studies in Ishikawa endometrial cancer cells to evaluate the functional impact of Tig1 and C/ebpalpha.

Main Results:

  • Tig1 and C/ebpalpha showed significantly reduced expression in endometrial cancer cell lines and clinical samples compared to normal tissues.
  • Aberrant methylation of the Tig1 gene promoter was observed in endometrial cancer cell lines and clinical samples.
  • Epigenetic treatment increased histone H3 acetylation at both Tig1 and C/ebpalpha genes.
  • Forced expression of Tig1 or C/ebpalpha suppressed the growth of Ishikawa endometrial cancer cells.

Conclusions:

  • Tig1 and C/ebpalpha function as tumor suppressor genes in endometrial cancer.
  • Epigenetic silencing contributes to the loss of Tig1 and C/ebpalpha expression in endometrial cancer.
  • Re-expression of Tig1 and C/ebpalpha represents a potential therapeutic strategy for endometrial cancer.

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