Plant Flavonoid Galangin Fights Vascular Aging by Triggering Cellular Cleanup

Vascular aging — the progressive deterioration of blood vessel function — is a root driver of cardiovascular disease, the leading cause of death worldwide. As endothelial cells that line blood vessels accumulate damage over time, they enter senescence, losing their ability to regulate vascular tone, inflammation, and repair. Finding compounds that safely slow this process is a central goal of longevity medicine.

This study investigated galangin (3,5,7-Trihydroxyflavone), a naturally occurring flavonoid from plants and medicinal herbs, as a potential anti-aging agent for vascular endothelial cells. Using d-galactose to artificially induce senescence in both human aortic endothelial cells and a mouse model, the researchers assessed whether galangin could reverse or reduce aging phenotypes.

The key finding is mechanistic: galangin directly binds to SMAD3, a transcription factor in the TGF-β signaling pathway, and promotes transcriptional activation of PINK1 and LC3 — core regulators of mitophagy. Mitophagy is the selective autophagy of damaged mitochondria, a critical quality-control mechanism that declines with age. By enhancing mitophagy, galangin reduced reactive oxygen species (ROS), restored mitochondrial membrane potential, and lowered expression of senescence markers including P21, P53, β-galactosidase, and γ-H2AX. Binding was confirmed through MST, CETSA, and DARTS assays, while ChIP assays validated p-SMAD3's role in PINK1 and LC3 gene regulation.

These findings position galangin as a novel SMAD3-targeting mitophagy activator — a mechanistically distinct approach to combating vascular aging compared to existing interventions. The dual validation in cell and animal models strengthens confidence in the pathway.

However, this remains preclinical research. Human pharmacokinetics, bioavailability, and long-term safety of galangin have not been established, and translation to clinical use requires further investigation.