Phenyl Selenide-Based Precursors as Hydrogen Peroxide Inducible DNA Interstrand Cross-Linkers

Area of Science:

• Medicinal Chemistry
• Molecular Biology
• Cancer Therapeutics

Background:

• DNA interstrand crosslinks (ICLs) are toxic lesions that block DNA separation, leading to cell death.
• Existing ICL agents often cause adverse side effects in normal cells.
• Hydrogen peroxide (H₂O₂)-inducible ICL agents offer selective cancer cell targeting due to higher H₂O₂ levels in tumors.

Purpose of the Study:

• To explore novel phenyl selenide-based precursors as H₂O₂-inducible DNA ICL agents.
• To investigate the effect of substituents on the DNA crosslinking ability and efficacy.
• To evaluate the cytotoxicity and cellular effects of these novel agents against cancer cells.

Main Methods:

• Synthesis and characterization of phenyl selenide precursors (1-3).
• Activation by H₂O₂ to generate reactive quinone methides (QMs) for DNA crosslinking.
• Mechanistic studies to identify DNA alkylation sites.
• In vitro cytotoxicity assays using H1299 human lung cancer cells.

Main Results:

• Phenyl selenide precursors 1-3 successfully generated reactive QMs upon H₂O₂ activation, leading to DNA crosslinking.
• The introduction of an electron-donating methoxy (OMe) group significantly enhanced DNA crosslinking ability.
• Agents 1-3 demonstrated potent cytotoxicity against H1299 cells, inducing DNA damage, apoptosis, and G0/G1 cell cycle arrest.
• These agents exhibited higher efficacy compared to clinically used drugs.

Conclusions:

• Phenyl selenide-based precursors represent a viable strategy for developing selective H₂O₂-inducible DNA ICL agents.
• Substituent modification, particularly with electron-donating groups, can optimize the efficacy of these agents.
• The developed agents show promise for targeted cancer therapy with reduced side effects.