Dietary Antioxidants Influence IER5 Activation and DNA Repair: Implications for Radioprotection and Healthy Aging

Area of Science:

• Nutritional Science
• Molecular Biology
• Radioprotection

Background:

• Natural food sources offer promising radioprotective agents.
• Ionizing radiation poses risks to cellular health and aging.
• Dietary compounds can influence DNA damage response pathways.

Purpose of the Study:

• Investigate the effects of micronized bioactive compounds on DNA damage response.
• Evaluate the radioprotective potential of specific phytochemicals and their combinations.
• Analyze antioxidant capacity in food sources rich in key compounds.

Main Methods:

• Cultured human retinal epithelial cells (hTERT-RPE1) treated with individual compounds and mixtures.
• Evaluation of IER5 gene expression, a marker for DNA repair and cell survival.
• Antioxidant capacity analysis of selected food items from the Czech market.

Main Results:

• Lycopene and quercetin demonstrated the most potent effects on IER5 expression.
• Significant variability in antioxidant potential was observed among different food cultivars.
• Combinations of compounds showed distinct, sometimes opposing, effects on IER5 expression.

Conclusions:

• Radioprotective activity of dietary antioxidants is influenced by compound combinations.
• Phytochemicals like quercetin and lycopene can modulate DNA repair pathways.
• These compounds show potential as combinatory agents for genomic stability and healthy aging.