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Decrease of DNA methyltransferase 1 expression relative to cell proliferation in transitional cell carcinoma.

Fumihiro Kimura1, Hans-Helge Seifert, Andrea R Florl

  • 1Urologische Klinik, Heinrich-Heine-Universität Düsseldorf, Germany.

International Journal of Cancer
|February 21, 2003
PubMed
Summary
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In bladder cancer, DNA methyltransferase I (DNMT1) expression is reduced relative to cell proliferation, contributing to DNA hypomethylation. However, this downregulation doesn't solely determine the extent of hypomethylation in transitional cell carcinoma (TCC).

Area of Science:

  • Epigenetics
  • Cancer Biology
  • Molecular Oncology

Background:

  • Common cancers like transitional cell carcinoma (TCC) exhibit both gene hypermethylation and global DNA hypomethylation.
  • Genome-wide hypomethylation primarily impacts repetitive sequences, such as LINE-1 retrotransposons, crucial for genomic stability.
  • Proper methylation of repetitive sequences relies on adequate DNA methyltransferase I (DNMT1) expression during DNA replication.

Purpose of the Study:

  • To investigate the expression of DNMT1 relative to cell proliferation in TCC and renal cell carcinoma (RCC) cell lines and tissues.
  • To understand the role of DNMT1 downregulation in DNA hypomethylation observed in these cancers.
  • To explore the expression patterns of de novo methyltransferases DNMT3A and DNMT3B in TCC and RCC.

Main Methods:

Related Experiment Videos

  • Analysis of DNMT1 mRNA and protein levels in cancer cell lines and tissues relative to the proliferation marker PCNA.
  • Assessment of DNA hypomethylation using LINE-1 methylation levels.
  • Reporter gene assays to evaluate DNMT1 promoter regulation.
  • Quantitative analysis of DNMT3A and DNMT3B mRNA expression.

Main Results:

  • All tested tumor cell lines showed decreased DNMT1 expression relative to PCNA, alongside DNA hypomethylation.
  • The extent of DNMT1 downregulation did not correlate with the degree of DNA hypomethylation.
  • DNMT1:PCNA mRNA ratios were diminished in a significant portion of TCC tissues, but this also lacked correlation with hypomethylation.
  • DNMT3B was overexpressed in about half of high-stage TCC, and DNMT3A/DNMT3B were generally higher in RCC than TCC lines.

Conclusions:

  • DNMT1 expression does not adequately increase with cell proliferation in bladder cancer, likely contributing to repetitive DNA hypomethylation.
  • The relative DNMT1 downregulation is a factor in hypomethylation but does not solely dictate its extent.
  • DNMT3B overexpression may play a role in advanced TCC, suggesting complex epigenetic dysregulation in these cancers.