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Repression of MAL tumour suppressor activity by promoter methylation during cervical carcinogenesis

Renée M Overmeer1, Florianne E Henken, Mariska Bierkens

  • 1Department of Pathology, Unit of Molecular Pathology, VU University Medical Center, Amsterdam, The Netherlands.

The Journal of Pathology
|August 8, 2009
PubMed

Insights

The MAL gene is silenced by promoter methylation during cervical cancer development. Detecting MAL promoter methylation in cervical scrapings can help assess the risk of high-grade lesions in women.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • T-lymphocyte maturation associated protein (MAL) is significantly downregulated in cervical oncogenesis.
  • Understanding MAL gene silencing mechanisms is crucial for cervical cancer research.
  • Assessing MAL alterations could aid risk stratification in HPV-positive women.

Purpose of the Study:

  • To investigate the mechanism of MAL gene silencing in cervical carcinogenesis.
  • To determine the functional role of MAL in cervical cancer development.
  • To evaluate the diagnostic potential of MAL alterations for risk assessment.

Main Methods:

  • Quantitative PCR and methylation-specific PCR were used to analyze MAL mRNA expression and promoter methylation.
  • Experiments involved primary keratinocytes, HPV-immortalized cells, cervical cancer cell lines, biopsies, and scrapings.
  • Functional assays included ectopic MAL expression in SiHa cells to assess proliferation, migration, and anchorage-independent growth.

Main Results:

  • MAL mRNA was undetectable in HPV-immortalized and cancer cells, with upregulation observed after methylation inhibition.
  • MAL promoter methylation was prevalent in HPV-immortalized cells and cancer cells.
  • Ectopic MAL expression suppressed cancer cell growth and migration.
  • MAL promoter methylation increased with lesion grade, from 9% in CIN1 to 93% in adenocarcinomas.
  • Methylation in scrapings predicted underlying high-grade lesions and correlated with reduced mRNA expression.

Conclusions:

  • MAL gene silencing via promoter methylation is a key event in HPV-induced cervical carcinogenesis.
  • MAL promoter methylation and mRNA expression analysis in cervical scrapings show promise as a diagnostic tool.
  • This approach could improve the detection of CIN3, squamous cell carcinoma, and adenocarcinoma.

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