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DNMT1 silencing affects locus specific DNA methylation and increases prostate cancer derived PC3 cell invasiveness

Ahmed Yaqinuddin1, Sohail A Qureshi, Romena Qazi

  • 1Department of Biological and Biomedical Sciences, Aga Khan University, Karachi, Pakistan.

The Journal of Urology
|June 23, 2009
PubMed
Abstract

Insights

DNA methyltransferase 1 (DNMT1) depletion in prostate cancer cells reduced proliferation but increased migration and invasion. This highlights cell-type specific roles for DNMT1 in cancer progression.

Area of Science:

  • Cancer Biology
  • Epigenetics
  • Genomics

Background:

  • DNA methyltransferase 1 (DNMT1) is crucial for maintaining DNA methylation patterns in somatic cells.
  • DNMT1's role in gene expression and cellular phenotype appears to be cell-type specific, with distinct effects observed in colon and gastric cancer cell lines.
  • Understanding DNMT1's impact in prostate cancer is essential due to its potential role in tumorigenesis.

Purpose of the Study:

  • To investigate the impact of DNMT1 depletion on gene expression profiles in prostate cancer cells.
  • To determine the effect of DNMT1 silencing on the cellular phenotype of prostate cancer cells.
  • To compare the consequences of DNMT1 depletion in prostate cancer with those observed in other cancer types.

Main Methods:

  • DNMT1 expression was silenced in PC3 prostate cancer cells using small interfering RNA (siRNA).
  • Validation of DNMT1 silencing was performed using reverse transcriptase-polymerase chain reaction (RT-PCR) and Western blotting.
  • Cell proliferation, migration, and invasion assays were conducted to assess phenotypic changes, alongside DNA microarrays for gene expression analysis.

Main Results:

  • DNMT1 depletion significantly decreased cell proliferation in PC3 cells.
  • Silencing DNMT1 markedly increased the migratory and invasive potential of prostate cancer cells.
  • DNMT1 loss was associated with increased expression of CDKN3 and claudin-3, and demethylation of Rb1 and RAR-beta promoters.

Conclusions:

  • The genetic and phenotypic effects of DNMT1 silencing in prostate cancer cells differ significantly from those in colon and gastric cancer cells.
  • DNMT1 appears to preferentially target specific gene promoters, with cell-type specificity.
  • Reducing DNMT1 levels or activity may enhance prostate cancer cell invasiveness, suggesting a potential therapeutic target.

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