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Improved nuclear localization of DNA-binding polyamides.

Nicholas G Nickols1, Claire S Jacobs, Michelle E Farkas

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena CA 91125, USA.

Nucleic Acids Research
|December 19, 2006
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Two novel non-fluorescent polyamides effectively target the hypoxia response element (HRE) for gene regulation. These DNA-binding molecules show significant potential for therapeutic applications by inhibiting vascular endothelial growth factor (VEGF) expression.

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Area of Science:

  • Molecular Biology
  • Medicinal Chemistry
  • Genetics

Background:

  • DNA-binding polyamides require nuclear localization for endogenous gene regulation.
  • Predicting polyamide nuclear uptake is challenging, and fluorescent labels can affect cellular uptake.
  • Non-fluorescent polyamides are desirable for gene regulation due to limitations associated with fluorophores.

Purpose of the Study:

  • To synthesize and evaluate non-fluorescent polyamides targeting the hypoxia response element (HRE).
  • To identify polyamides capable of effective nuclear localization and biological activity without fluorescent labels.
  • To use inhibition of vascular endothelial growth factor (VEGF) expression as a readout for HRE-targeted polyamide efficacy.

Main Methods:

  • Systematic synthesis of a focused library of non-fluorescent, HRE-targeted polyamides with varied C-terminal tails.
  • Assessment of HRE-binding affinities for synthesized polyamides.
  • Evaluation of biological activity by measuring VEGF expression inhibition in HeLa cells.
  • Investigation of promoter occupancy by HIF-1 transcription factor.

Main Results:

  • Synthesized polyamides exhibited HRE-binding affinities comparable or superior to fluorescent analogs.
  • Two non-fluorescent polyamides demonstrated biological activity rivaling that of a previously reported fluorescein-labeled polyamide.
  • Evidence of inhibited promoter occupancy by HIF-1 was observed with HRE-targeted polyamides.

Conclusions:

  • Non-fluorescent polyamides can effectively localize to the nucleus and regulate gene expression.
  • The study identified potent, non-fluorescent HRE-targeted polyamides for potential therapeutic development.
  • HRE-targeted polyamides inhibit VEGF expression by interfering with HIF-1 binding to the HRE.