Scientists May Have Found a Protein That Spreads Aging

Why It Matters

Targeting HMGB1 may unlock therapies that slow systemic aging, boosting healthspan and reducing age‑related disease burden.

Key Takeaways

• HMGB1 identified as circulating protein driving age‑related senescence
• Senescent cells release HMGB1, inducing inflammation in healthy cells
• Elderly humans show higher plasma re‑HMGB1 than middle‑aged adults
• Blocking HMGB1 in mice restores muscle regeneration and performance
• Targeting HMGB1 could enable new anti‑aging therapeutics for humans

Summary

A July 2025 study led by Oak Hee‑Jun at Korea University of Medicine identified the protein high‑mobility group box‑1 (HMGB1) as a circulating factor that can transmit aging signals through the bloodstream.

The researchers showed that senescent cells leak HMGB1, which binds to receptors on otherwise healthy cells, activates inflammatory pathways and drives those cells into senescence—a contagion‑like mechanism. Blood from older mice accelerated aging in young partners, while young blood rejuvenated old mice, mirroring classic parabiosis findings.

Human plasma analysis revealed that individuals in their 70s‑80s have markedly higher levels of circulating re‑HMGB1 compared with people in their 40s. In middle‑aged mice, pharmacologic blockade of HMGB1 reduced senescence markers, enhanced muscle regeneration, improved physical performance, and lowered systemic inflammation.

If the HMGB1 axis can be safely inhibited in humans, it could become a cornerstone of next‑generation anti‑aging therapies, offering a route to restore tissue repair capacity and mitigate age‑related inflammation.

Original Description

Scientists may have identified one of the molecules that helps aging spread through the body.

Block HMGB1 in mice → less inflammation, better muscle regeneration, improved tissue repair.

The next wave of longevity therapies may focus on stopping aging signals, not just repairing the damage.

Full Video: https://youtu.be/oBWkvWVo1Io