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A team led by Kyushu University’s Ryuichi Tatsumi reports that lipoic acid trisulfide (LASSS) more than doubled the binding affinity of hepatocyte growth factor (HGF) to the c-met receptor in laboratory experiments. The finding could inform research on muscle repair with age, but the source describes no evidence that LASSS restores muscle function in animals or people.
Researchers led by Professor Ryuichi Tatsumi at Kyushu University say a sulfur-containing compound called lipoic acid trisulfide (LASSS) more than doubled the binding affinity of a muscle-repair protein to its receptor in laboratory experiments. The result, reported in Scientific Reports, points to a possible way to strengthen a biological signal involved in muscle regeneration, but it does not show that the compound repairs aging muscles in animals or people.
The protein, hepatocyte growth factor (HGF), helps activate satellite cells, specialized stem cells that contribute to repairing skeletal muscle. HGF binds to a receptor called c-met on these cells. The researchers were investigating whether chemical damage to HGF could weaken this signaling process as muscles age.
In earlier work, the team identified two HGF sites, Y198 and Y250, where a chemical change called nitration can interfere with the protein’s ability to bind c-met. In the reported experiments, the researchers tested two antioxidant compounds, glutathione trisulfide (GSSSG) and LASSS. Both reduced nitration at those sites, but that protection alone did not fully restore HGF’s receptor binding.
When the researchers used a higher amount of trisulfide relative to HGF, LASSS increased binding affinity by more than twofold compared with untreated HGF, according to the source report. The treatment also made HGF more resistant to functional loss associated with nitration, particularly at Y198. These are laboratory findings about a protein-receptor interaction; the supplied report does not describe a treatment trial or demonstrate improved strength, mobility, or recovery.
A Potential Boost to Muscle Repair Signaling
The finding offers a possible research direction because muscle regeneration depends partly on HGF activating satellite cells. If age-related chemical changes make HGF less able to bind c-met, improving that interaction could help scientists understand how to preserve the repair signal. The study suggests LASSS may do more than limit one form of chemical damage: under the tested conditions, it also increased HGF’s receptor binding.
That result is an early mechanistic observation, not evidence of a practical intervention. A stronger binding interaction in a laboratory assay does not by itself establish that more satellite cells will be activated in living tissue, or that muscle will recover better. The work may guide further studies of age-related loss of regenerative capacity, but its relevance to older adults depends on experiments beyond those described.
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How HGF Signals Muscle Stem Cells
Skeletal muscle can repair some damage through satellite cells, which usually remain inactive alongside muscle fibers. Signals can activate them, after which they multiply and develop into cells that help restore muscle tissue. HGF is one signal involved in that process. It can be stored in material surrounding muscle fibers and released following injury or mechanical stimulation such as movement or stretching.
The research builds on the team’s earlier finding that nitration can alter HGF at sites involved in receptor binding. Tatsumi told the source report that HGF is not necessarily absent with age; instead, it may be chemically altered after production. That proposed mechanism provides the rationale for testing compounds that could limit nitration or offset its effects. The report describes aging-related muscle changes, including loss of strength and repair capacity, as the broader problem the research aims to address.
From Binding Assay to Muscle Recovery
The reported result does not establish whether LASSS can reach muscle tissue, remain safe, or produce the same effect in a living organism. The supplied source material gives no animal or human results, dose information for people, or evidence of changes in muscle strength, mobility, or recovery. It also does not explain the molecular reason LASSS increased binding affinity beyond reducing nitration.
It remains unclear whether the effect can be reproduced under conditions relevant to aging muscle, how it compares with other approaches, and whether it could lead to a usable medicine. The finding should be treated as a laboratory observation, not as a proven way to prevent or reverse muscle decline.
Further Tests Must Show Real-World Effects
The next research question is whether the enhanced HGF-c-met interaction leads to stronger satellite-cell activation and measurable muscle repair in more complex experimental systems. Studies would also need to examine how LASSS behaves in living tissue and assess its safety before any conclusions about use in people could be made.
The source report does not specify a follow-up study, timeline, or planned clinical trial. For now, the finding extends the team’s investigation of HGF nitration and muscle regeneration; whether it can translate into a treatment remains unknown.
Key Questions
What did the researchers discover?
In laboratory experiments, LASSS increased HGF’s binding affinity for the c-met receptor by more than twofold compared with untreated HGF, according to the source report.
Why does HGF matter to muscle repair?
HGF helps activate satellite cells, specialized stem cells that can multiply and contribute to repairing skeletal muscle. It does so in part by binding to the c-met receptor on those cells.
Does the study show LASSS can repair aging muscles in people?
No. The reported results concern laboratory tests of a protein-receptor interaction. The supplied report provides no evidence of improved muscle repair or strength in people.
What remains unknown about the finding?
The source does not establish whether LASSS has the same effect in living tissue, whether it is safe, or whether stronger HGF binding leads to better muscle recovery. Those questions require further research.
Source: sciencedaily.com
