[Pseudo-furocoumarin: synthesis, DNA-binding behavior and cytotoxicity]

Area of Science:

• Medicinal Chemistry
• Molecular Biology
• Organic Synthesis

Background:

• Furocoumarins possess antitumor properties, but typically require UV radiation for activation.
• Existing furocoumarins have limitations in standard environmental conditions for therapeutic use.
• The "minimal DNA-intercalating" hypothesis offers a framework for structural modification.

Purpose of the Study:

• To design and synthesize novel pseudo-furocoumarins with improved antitumor activity.
• To investigate the DNA-binding interactions and modes of the synthesized compounds.
• To evaluate the in vitro antiproliferative efficacy against various cancer cell lines.

Main Methods:

• Synthesis of pseudo-furocoumarins via Pechmann and Suzuki coupling reactions.
• DNA interaction studies using DNA melting curves, UV-Vis absorption, fluorescence spectroscopy, and viscosity titration.
• In vitro antiproliferative activity assessment using the sulforhodamine B (SRB) assay on A549, MCF-7, and SKOV-3 cell lines.

Main Results:

• Pseudo-furocoumarins were successfully synthesized, featuring a single bond between furan and coumarin rings.
• Compounds exhibited varied DNA-binding modes, including partial and classical intercalation, and bridge-structure interactions.
• All synthesized pseudo-furocoumarins demonstrated enhanced antiproliferative activity compared to psoralen, with non-classical intercalators showing superior efficacy.

Conclusions:

• The study successfully applied the "minimal DNA-intercalating" hypothesis to develop potent pseudo-furocoumarins.
• Structural modification led to improved antitumor activity independent of UV radiation.
• Pseudo-furocoumarins represent promising candidates for cancer therapy, offering a new avenue for furocoumarin-based drug development.