🧬 Scientific summary of the discovery of a compound that enhances repair of aging muscles
A research team led by a professor at Japan’s Kyushu University announced the discovery of a chemical compound that can enhance the body’s ability to repair skeletal muscles that have deteriorated due to aging. The compound, known as lipoic acid trisulfide (LASSS), works to protect and improve the function of hepatocyte growth factor (HGF), the protein responsible for stimulating muscle cell regeneration. The results show LASSS’s ability to resist the harmful chemical changes that affect HGF, which could open new horizons for maintaining muscle health as we age.
🧠 How do muscles weaken with age?
Skeletal muscles begin to deteriorate relatively early during the aging process. These changes include:
- Loss of muscle strength.
- Increased scarring (fibrosis) within muscle tissue.
- Accumulation of fat inside muscles.
- A decrease in fast-twitch muscle fibers, which are responsible for quick and powerful movement.
Together, these factors affect mobility and daily muscle function.
🩺 The role of HGF in muscle repair
The research focuses on HGF, a protein that activates the muscle repair process. In its normal state, HGF remains inactive and surrounded by muscle cells.
When a muscle injury occurs or the muscle is exposed to mechanical stimulation, HGF is released and binds to receptors called c-met on satellite cells. These cells are stem cells that maintain muscle regeneration.
This binding activates the stem cells to resume activity, proliferate, and mature in order to repair damaged muscle.
🧪 Chemical modifications affecting HGF
Previous studies have shown that HGF can undergo a chemical modification called nitration, in which nitro groups are added to specific sites in the protein (Y198 and Y250) that are considered key binding regions with the c-met receptor.
This modification prevents HGF from binding to its receptor, much like a rusty key that no longer fits the lock, thereby disrupting the muscle repair system, and this may explain weakened muscle repair in older adults.
🌱 Testing sulfur-based antioxidants and their effects
Researchers conducted experiments on two sulfur-structured antioxidant compounds: glutathione trisulfide (GSSSG) and lipoic acid trisulfide (LASSS). These compounds are characterized by three sulfur atoms linked in sequence, and they participate in redox reactions.
Their ability to reduce HGF damage caused by nitration was tested. Initial experiments showed that both compounds reduced the chemical modification at sites Y198 and Y250, but neither could fully restore protein activity at low concentrations.
🧪 Remarkable results with increased LASSS concentration
By increasing the LASSS concentration to a molar ratio of 1:8000 (HGF : LASSS), the team observed an unexpected phenomenon:
- HGF’s ability to bind to the c-met receptor improved to more than twice that of the untreated protein.
- Increased resistance of the protein to loss of function caused by nitration, especially at site Y198.
These effects were unique and were not observed with GSSSG.
Researcher Ryoichi Tatsumi explained that LASSS does not merely act as an antioxidant; it is believed to induce a subtle structural change in HGF, generating a more active “Super HGF” version that binds its receptor more efficiently and resists chemical damage.
🧬 Verification of effectiveness in living tissue
The researchers tested LASSS on mice that suffered muscle atrophy due to long-term tail suspension, which mimics conditions of reduced muscle activity.
Mice treated with LASSS showed a significant reduction in nitration levels compared with untreated mice, while GSSSG did not show the same benefit.
These results confirm that LASSS’s positive effect extends to living tissues and not only to isolated proteins in the lab.
🩺 Potential future applications for maintaining muscle health
This discovery has opened new horizons for developing strategies that preserve muscle function during aging, or in cases of prolonged recovery or extended inactivity.
This strategy may also affect several animal species, including humans and pets, thereby aiming to improve quality of life and the duration of physical activity and independence.
Despite the promising results, scientists stress the need for more studies on aged animals and for analyses of safety and efficacy inside the body in future trials.
🧬 Conclusion
The research has paved the way for understanding the mechanisms of muscle-repair decline in aging and the impact of chemical modifications on one of the vital proteins. LASSS provides a strong example of how pharmaceutical compounds can modify proteins to enhance their vital functions, which may help people maintain their muscles and motor performance as they age.
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