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Construction of a novel DNA decoy that inhibits the oncogenic beta-catenin/T-cell factor pathway

Yosuke Seki1, Hirofumi Yamamoto, Chew Yee Ngan

  • 1Department of Surgery and Clinical Oncology, Graduate School of Medicine, Osaka University, 2-2 Yamada-oka, Suita City, 565-0871 Osaka, Japan.

Molecular Cancer Therapeutics
|May 2, 2006
PubMed

Insights

A novel DNA decoy targeting the beta-catenin/T-cell factor (TCF) pathway effectively inhibits cancer cell growth. This molecular therapy shows potential for treating malignancies by reducing TCF activity and downstream gene expression.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Genetics

Background:

  • The beta-catenin/T-cell factor (TCF) signaling pathway is crucial in cancer development, driving the expression of oncogenic genes.
  • Hyperactivation of TCF signaling is observed in various human malignancies, making it a key therapeutic target.

Purpose of the Study:

  • To design and evaluate an effective double-stranded DNA decoy to inhibit TCF hyperactivity in tumor cells.
  • To assess the decoy's ability to reduce the expression of TCF target genes and inhibit cancer cell proliferation.

Main Methods:

  • Established a TCF-activated model using HEK293 cells and introduced beta-catenin cDNA.
  • Designed and tested double-stranded oligodeoxynucleotides based on TCF-binding sequences.
  • Utilized FITC-labeling to track oligodeoxynucleotide cellular uptake and retention.
  • Assessed TCF activity, downstream gene promoter activity, mRNA expression, and cell proliferation in HCT116 colon cancer cells.

Main Results:

  • An 18-mer oligodeoxynucleotide decoy demonstrated stable double-stranded DNA formation and efficient inhibition of TCF activity.
  • The decoy was effectively internalized into the nucleus and retained within cells for up to 96 hours.
  • The TCF decoy significantly inhibited TCF activity, promoter activity of target genes (cyclin D1, c-myc, MMP7), and their mRNA expression in HCT116 cells.
  • Significant inhibition of HCT116 tumor cell proliferation was observed, while nontumor HEK293 cells were unaffected.

Conclusions:

  • The developed TCF decoy effectively reduces TCF activity and transcriptional activation of downstream oncogenic genes.
  • This TCF decoy represents a potentially efficient and non-toxic molecular targeted therapy for cancers driven by aberrant TCF signaling.

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