On June 24, 2025, a groundbreaking study by a research team from the Korea University College of Medicine revealed that the blood protein High Mobility Group Box 1 (HMGB1) might play a significant role in the systemic transmission of cellular aging. The study, led by Professor Ok Hee Jeon, provides new insights into the mechanisms of aging and opens potential therapeutic pathways to combat aging-related decline.

The Role of HMGB1 in Aging

HMGB1 is a known factor in the senescence-associated secretory phenotype (SASP), which refers to a collection of inflammatory cytokines, chemokines, and other factors secreted by senescent cells. These senescent cells contribute to aging by disrupting tissue homeostasis and regenerative capacity. The research team sought to understand how senescence spreads beyond localized areas, leading to systemic aging effects.

According to the findings published in the journal Metabolism, Professor Jeon's team concluded that a reduced form of HMGB1, referred to as ReHMGB1, could circulate in the bloodstream and induce senescence in distant cells, affecting various tissues throughout the body. This finding extends our understanding of how aging signals are transmitted and highlights potential therapeutic interventions.

Research Methodology

The researchers employed a combination of in vitro and in vivo experimentation to explore the effects of ReHMGB1. Their investigations included:

  • In Vitro Studies: Human cell lines, including fibroblasts and renal epithelial cells, were exposed to extracellular ReHMGB1 to assess changes in cell senescence markers.
  • In Vivo Models: Mice treated with ReHMGB1 exhibited increased indicators of aging and muscle dysfunction.

Key Findings

The results of this extensive study revealed several critical insights:

Observation Details
Senescence Induction ReHMGB1 significantly induced senescence markers in multiple human cell types.
Impact on Muscle Function Mice treated with ReHMGB1 showed decreased muscle function and increased levels of senescence markers (p21, p16).
Therapeutic Potential Administration of anti-HMGB1 antibodies enhanced muscle regeneration and improved physical performance in aged mice.

Implications of the Study

This research not only elucidates the role of HMGB1 in aging but also offers a promising avenue for therapeutic intervention. Blocking the transmission of aging signals could enhance regenerative capacity and ultimately improve the quality of life in aging populations. As Professor Jeon stated:

“This study reveals that aging signals are not confined to local tissues but can be systemically transmitted via the blood, with ReHMGB1 acting as a key driver.”

Future Research Directions

The discovery raises critical questions regarding further applications:

  • How can we effectively inhibit HMGB1 to prevent the spread of aging?
  • What other molecules may play similar roles in systemic aging?
  • Can interventions targeting HMGB1 improve healthspan beyond muscle regeneration?

Ongoing collaborations with experts in aging biology, such as Professor Irina Conboy of UC Berkeley and Professor Christopher Wiley of Tufts University, will likely foster further research in this promising domain.

Conclusion

In summary, this pivotal study led by the Korea University College of Medicine highlights the important role of HMGB1 in the systemic propagation of cellular aging. As researchers continue to investigate strategies to inhibit the detrimental effects of aging, this research serves as a foundational stone in developing therapies that mitigate age-related decline.

References

[1] Ji-Won Shin et al, Propagation of senescent phenotypes by extracellular HMGB1 is dependent on its redox state, Metabolism (2025).

[2] Korea University College of Medicine. Blood protein HMGB1 could be spreading aging throughout the body, study finds (2025, June 24) retrieved from Medical Xpress.