How EPA Fights Oxidative Stress at the Cellular Level: Two MicroRNA Pathways Uncovered
This laboratory study used human liver cells (HepG2) to explore how eicosapentaenoic acid (EPA), an omega-3 fatty acid, helps cells manage oxidative stress. Researchers focused on tiny genetic regulators called microRNAs, which control how genes are expressed.
They found that EPA lowers the activity of one microRNA (let-7c-3p), which normally suppresses a protein called TFAM that helps build new mitochondria. By reducing this microRNA, EPA allowed more TFAM activity, leading to improved mitochondrial function, fewer reactive oxygen species, and greater antioxidant capacity.
At the same time, EPA increased another microRNA (miR-34c-5p), which reduces the activity of a protein called SIRT1. This shift was linked to higher activity of natural antioxidant enzymes such as catalase, superoxide dismutase, and glutathione peroxidase. Together, these two pathways suggest EPA may support cellular antioxidant defenses through coordinated genetic signaling.
What this means for you
This early-stage cell research helps explain some of the biological mechanisms by which EPA may influence antioxidant activity and mitochondrial health at a molecular level. It does not test effects in humans, so it should be viewed as foundational science rather than direct evidence of health benefits.
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Cell biochemistry and function · 2026-09-01 · DOI: 10.1002/cbf.70298
Read the original source ↗This summary is for educational purposes only and is not medical advice. Always talk to your healthcare provider before making changes to your supplement routine.