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TL;DR
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Researchers at Kyushu University report that lipoic acid trisulfide (LASSS) more than doubled the binding affinity of the muscle-repair protein HGF to its receptor in laboratory experiments. The finding suggests a possible way to strengthen a signal involved in muscle regeneration, but it does not show that the compound repairs aging muscles in people.
Researchers at Kyushu University in Japan report that a sulfur-containing compound called lipoic acid trisulfide (LASSS) more than doubled the binding affinity of a protein involved in muscle repair to its cellular receptor in laboratory experiments. The finding, published in Scientific Reports, points to a possible way of strengthening a signal used to activate muscle stem cells, but the experiments do not establish that LASSS improves muscle repair or mobility in older people.
The work focused on hepatocyte growth factor (HGF), a protein that helps activate satellite cells, the stem cells involved in repairing skeletal muscle. HGF can attach to a receptor called c-met on satellite cells. That interaction contributes to activating the cells so they can multiply and help restore muscle tissue.
The team, led by Professor Ryuichi Tatsumi of Kyushu University’s Faculty of Agriculture, investigated whether chemical changes to HGF could interfere with this process. In earlier work, the researchers identified two sites on the protein, Y198 and Y250, where nitration can weaken its ability to bind c-met. Nitration is a chemical modification that can alter a protein’s structure or activity.
In the reported experiments, both glutathione trisulfide (GSSSG) and LASSS reduced nitration at those sites. That protection alone did not fully restore HGF’s receptor binding. When the researchers tested a higher amount of trisulfide relative to HGF, LASSS produced an additional effect: treated HGF showed more than twice the binding affinity for c-met compared with untreated HGF. The source describes this as a laboratory result, not a demonstrated benefit in living people.
A Stronger Signal, Not a Treatment Yet
The result matters because muscle regeneration depends partly on satellite-cell activation, and the researchers’ findings offer a potential route to strengthening one of the signals involved. With aging, muscle tissue can lose strength and recover less effectively; the source also describes changes such as fat accumulation, scar tissue and loss of fibers used for powerful movements. A method that helps preserve or improve HGF activity could be relevant to future research on those changes.
But stronger receptor binding is an early biological finding, not evidence that muscles become stronger, heal faster or retain independence. The study does not establish a dose that is safe or effective for people, nor does it show that taking LASSS would increase HGF activity in older adults. Its immediate significance is that it identifies a laboratory effect researchers can investigate further.
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How Aging May Disrupt HGF
Skeletal muscles are able to repair some damage through satellite cells, which normally remain inactive beside muscle fibers. When a repair signal activates them, they can multiply and develop into muscle cells. HGF is one of the proteins involved in that activation, and mechanical stimulation or injury can release it from material surrounding muscle fibers.
The researchers’ proposed explanation is that aging may affect not only how much HGF is available but also how well the protein functions. According to their prior findings, nitration at Y198 and Y250 can impair HGF’s connection with c-met. Tatsumi said the team considered whether antioxidant compounds might limit that chemical alteration or compensate for its effects. The new work tested two trisulfides; the reported binding increase was associated with LASSS at the higher experimental ratio.
“HGF is not necessarily missing as we age. Rather, it can be chemically altered after it is made.”
— Professor Ryuichi Tatsumi, Kyushu University
Human Benefits Remain Unproven
The report describes laboratory experiments; it does not report a clinical trial or show that LASSS was tested as a treatment in older adults. It remains unclear whether the binding effect occurs in living muscle, whether it would lead to more effective tissue repair, or what dose and delivery method could be appropriate. The source material also does not establish the compound’s safety for use as a medicine or supplement.
The experiments found that both tested trisulfides reduced nitration, while the greater-than-twofold binding result was reported for LASSS under the higher-ratio condition. The full extent and durability of that effect, as well as its relevance to age-related muscle loss, require further study. The proposed link between impaired HGF signaling and declining muscle repair is a research interpretation, not proof that this mechanism explains muscle aging by itself.
Testing the Effect Beyond the Lab
The next research step is to determine whether LASSS’s effect on HGF can be reproduced in more biologically complex settings and whether it changes satellite-cell activity or muscle repair. Researchers would also need to assess how the compound behaves in the body, including its safety, effective exposure and potential effects beyond HGF binding.
Until such evidence is available, the finding should be treated as a possible research lead, not a recommendation for people experiencing age-related muscle weakness. The published work establishes a change in a laboratory measure; whether that change can translate into a practical approach to preserving muscle function remains open.
Key Questions
What did the researchers discover?
They found that LASSS more than doubled HGF’s binding affinity for the c-met receptor compared with untreated HGF in the reported laboratory experiments.
What do HGF and c-met do?
HGF is a protein involved in activating satellite cells, which help repair skeletal muscle. It binds to the c-met receptor on those cells as part of that signaling process.
Does the discovery show that LASSS can repair aging muscles in people?
No. The reported evidence is from laboratory experiments. It does not show improved muscle repair, strength or mobility in people, and clinical benefits have not been established.
Why did the team study trisulfides?
The researchers tested two trisulfides, GSSSG and LASSS, because of their antioxidant properties and potential to affect chemical changes that can impair HGF. Both reduced nitration at the sites examined, while LASSS also increased receptor binding under a higher-ratio condition.
What evidence is still needed?
Further studies would need to test whether the laboratory effect occurs in living muscle, affects satellite-cell activity and improves repair, while also evaluating safety and dosing. The current report does not answer those questions.
Source: sciencedaily.com
