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Hypoxia-selective DNA interstrand cross-link formation by two modified nucleosides.

Yunyan Kuang1, Huabing Sun, J Craig Blain

  • 1Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, 53211, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
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Summary

Researchers synthesized nitroimidazole-modified thymidines and incorporated them into DNA. Photolysis generated a radical that induced DNA interstrand cross-links (ICL), with higher yields under hypoxic conditions.

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Area of Science:

  • Medicinal Chemistry
  • Molecular Biology
  • Biochemistry

Background:

  • DNA interstrand cross-links (ICLs) are crucial in cancer therapy.
  • Developing novel cross-linking agents with improved efficacy is an ongoing challenge.

Purpose of the Study:

  • To synthesize and characterize novel nitroimidazole-modified thymidines.
  • To investigate the ability of these modified nucleosides to form DNA interstrand cross-links (ICLs) upon photolysis.
  • To evaluate the influence of oxygen levels on ICL formation.

Main Methods:

  • Chemical synthesis of two nitroimidazole-modified thymidines (1a and 1b).
  • Incorporation of modified thymidines into DNA oligomers.
  • Photolysis of modified DNA oligomers at 350 nm.
  • Analysis of DNA interstrand cross-link (ICL) formation under varying oxygen conditions (hypoxic vs. aerobic).

Main Results:

  • Successful synthesis and DNA incorporation of nitroimidazole-modified thymidines.
  • Photolysis generated a 5-(2'-deoxyuridinyl)methyl radical intermediate.
  • This radical induced DNA interstrand cross-links (ICLs).
  • ICL yield was significantly higher under hypoxic conditions compared to aerobic conditions.

Conclusions:

  • Nitroimidazole-modified thymidines are effective precursors for photochemically induced DNA interstrand cross-links (ICLs).
  • Hypoxia enhances the efficiency of ICL formation, suggesting potential applications in targeting hypoxic tumors.
  • This strategy offers a novel approach for developing targeted DNA cross-linking agents.