Multiple repair pathways mediate cellular tolerance to resveratrol-induced DNA damage

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Resveratrol (RSV) shows potential health benefits, including anticancer properties.
• The complex anticancer mechanisms of RSV may involve genotoxic effects.
• Understanding RSV's genotoxicity is crucial for its therapeutic applications.

Purpose of the Study:

• To investigate the DNA damage effects of Resveratrol (RSV).
• To elucidate the molecular mechanisms of cellular tolerance to RSV-induced genotoxicity.
• To identify the DNA repair pathways involved in responding to RSV.

Main Methods:

• Utilized wild-type (WT) and isogenic DNA-repair deficient DT40 cell lines.
• Assessed DNA damage by quantifying γ-H2AX foci and chromosome aberrations (CAs).
• Compared the survival rates of WT and DNA-repair deficient cells exposed to RSV.

Main Results:

• RSV induced significant DNA damage, evidenced by γ-H2AX foci and CAs in WT cells.
• DNA-repair deficient cell lines (Parp1-/-, Polβ-/-, Brca1-/-, Brca2-/-, Rev3-/-, Rad18-/-) exhibited increased sensitivity to RSV.
• Enhanced DNA damage accumulation was observed in repair-deficient cells compared to WT cells.

Conclusions:

• RSV directly induces DNA damage in DT40 cells.
• Multiple DNA repair pathways, including base excision repair (BER), single-strand break repair (SSBR), homologous recombination (HR), and translesion DNA synthesis (TLS), are critical for cellular tolerance to RSV.
• These findings highlight the complex interplay between RSV and DNA repair mechanisms in cancer therapy.