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DNA methylation affects cell proliferation, cortisol secretion and steroidogenic gene expression in human

J Liu1, X-D Li, A Vaheri

  • 1Department of Pathology, Haartman Institute, University of Helsinki, FIN-00014 Helsinki. Jiangi.Liu@helsinki.fi

Journal of Molecular Endocrinology
|December 14, 2004
PubMed

Insights

DNA methylation impacts human adrenocortical cell proliferation and steroid hormone production. Inhibiting DNA methylation altered gene expression and cortisol secretion, suggesting its role in adrenal function.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Cancer Research

Background:

  • Aberrant DNA methylation is implicated in human adrenocortical tumorigenesis and hormone dysregulation.
  • Understanding DNA methylation's role in steroidogenesis is crucial for adrenal function research.

Purpose of the Study:

  • To investigate the effects of DNA methylation on steroidogenesis in human adrenocortical cells.
  • To elucidate the molecular mechanisms underlying DNA methylation's influence on adrenal cell behavior and hormone production.

Main Methods:

  • Utilized the NCI-H295R human adrenocortical cell line as a model system.
  • Administered 5-aza-2'-deoxycytidine (Azad), a DNA methylation inhibitor, to assess its impact on cell proliferation, gene expression, and hormone secretion.
  • Analyzed the expression of key steroidogenic genes, transcription factors (SF-1, DAX-1), and DNA methylation patterns.

Main Results:

  • Azad treatment significantly reduced cell proliferation and altered the expression of cell cycle regulators.
  • Cortisol secretion increased with Azad treatment, while dehydroepiandrosterone sulfate secretion remained unaffected.
  • Azad modulated the expression of multiple steroidogenic enzymes and key regulatory genes (StAR, SF-1, DAX-1), with varying effects on basal and stimulated conditions.
  • Changes in DNA methylation patterns and MeCP2 expression were observed following Azad treatment.

Conclusions:

  • DNA methylation plays a significant role in regulating cell proliferation in human adrenocortical cells.
  • DNA methylation influences steroidogenesis by affecting the expression of critical steroidogenic genes and regulatory factors.
  • These findings highlight the potential involvement of DNA methylation in adrenocortical tumorigenesis and hormone production.

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