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Epigenetic Downregulation of PTEN in Gallbladder Cancer

Dinesh Singh Tekcham1,2, Sanjeev Gupta3, Braj Raj Shrivastav4

  • 1Centre for Genomics, Molecular and Human Genetics, Jiwaji University, Gwalior, Madhya Pradesh, 474 011, India.

Journal of Gastrointestinal Cancer
|January 27, 2017
PubMed
Abstract

Insights

Phosphatase and tensin homolog (PTEN) gene promoter methylation and downregulation were observed in gallbladder cancer (GBC). PTEN may serve as a potential biomarker for GBC management, requiring further validation with larger studies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • Gallbladder cancer (GBC) is a growing global health concern.
  • Phosphatase and tensin homolog (PTEN) is a tumor suppressor gene crucial in various cancers.
  • The specific role of PTEN in GBC pathogenesis remains largely unexplored.

Purpose of the Study:

  • To investigate the epigenetic role of PTEN in gallbladder cancer (GBC) and gallbladder adenoma (GSD).
  • To analyze PTEN promoter methylation and its correlation with gene expression in GBC and GSD tissues.

Main Methods:

  • PTEN promoter methylation assessed using methylation-specific PCR in GBC and GSD tissues.
  • PTEN transcript expression analyzed via RT-PCR and qPCR.
  • Immunohistochemistry used to correlate methylation with protein expression in GBC tissue microarrays.
  • Statistical analysis included Student's t-test with significance set at p ≤ 0.05.

Main Results:

  • PTEN promoter methylation detected in 30% of GBC and 22.86% of GSD cases.
  • Significant downregulation of PTEN expression observed in advanced GBC (p < 0.0001), but not in GSD (p = 0.901).
  • Immunohistochemistry revealed PTEN protein loss or reduction in 70.29% of GBC samples.

Conclusions:

  • Epigenetic silencing of PTEN, through promoter methylation and subsequent downregulation, is implicated in GBC development.
  • PTEN demonstrates potential as a valuable biomarker for GBC management.
  • Larger sample sizes are recommended for further validation of PTEN's role in GBC.
Keywords:
EpigeneticGallbladder cancerGallstone diseasesMethylationPTEN

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