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Sensitizing DNA Towards Low-Energy Electrons with 2-Fluoroadenine
Jenny Rackwitz1, Janina Kopyra2, Iwona Dąbkowska3
1Institute of Chemistry-Physical Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476, Potsdam, Germany.
2-Fluoroadenine (2F)A enhances DNA strand breakage when exposed to low-energy electrons, acting as an effective radiosensitizer for cancer radiotherapy across various electron energies.
Area of Science:
- Physical Chemistry
- Radiation Biology
- Molecular Biophysics
Background:
- Low-energy electrons (LEEs) are a primary cause of DNA radiation damage via dissociative electron attachment.
- 2-Fluoroadenine (2F)A is a potential therapeutic agent for cancer radiotherapy.
- Understanding LEE-induced reactions in (2F)A within DNA is crucial for its application.
Purpose of the Study:
- To investigate the LEE-induced reactions of 2-Fluoroadenine (2F)A.
- To quantify DNA strand breaks in (2F)A-containing oligonucleotides upon LEE irradiation.
- To evaluate the radiosensitizing potential of (2F)A.
Main Methods:
- Characterization of LEE-induced reactions of (2F)A in both gas and condensed phases.
- Analysis of negative ion resonances and anion-mediated fragmentation.
- Absolute quantification of DNA strand breaks in irradiated oligonucleotides.
Main Results:
- The incorporation of (2F)A into DNA significantly enhances DNA strand breakage.
- Strand-break cross sections exhibit clear energy dependence.
- Enhanced strand breakage by (2F)A was observed consistently at 5.5, 10, and 15 eV.
Conclusions:
- 2-Fluoroadenine (2F)A acts as an effective radiosensitizer.
- (2F)A enhances DNA damage induced by low-energy electrons.
- The radiosensitizing effect of (2F)A is operative over a broad range of electron energies.
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