🧪 A Scientific Discovery Opens New Horizons for Repairing Aging Muscles
A Japanese research team announced the discovery of a promising molecule that could enhance the body’s ability to repair muscles worn down by aging. This innovation is based on strengthening an important biological signal linked to the regeneration of muscle tissue, which could open new horizons for combating age-related muscle loss.
🦴 Muscle Deterioration with Aging
Skeletal muscles, which connect bones and allow movement, grasping objects, and maintaining balance, begin to lose strength and recovery ability relatively early during the aging process. Over time, fatty fibrous tissue may accumulate in the muscles and the number of specialized fibers responsible for fast, powerful movement decreases, making daily tasks harder and limiting mobility and independence.
Even so, muscles have an innate ability to repair themselves, relying on specialized stem cells known as satellite cells or “satellite cells,” which remain dormant until the body receives a signal that prompts them to divide and differentiate into muscle cells to help heal the tissue.
🔬 The Role of HGF Protein in Activating Muscle Repair
Hepatocyte growth factor, known as hepatocyte growth factor (HGF), is a vital element in activating satellite cells. This protein is stored in the supporting matrix surrounding muscle fibers and is released when injury occurs or when there is mechanical stimulation such as movement or stretching.
HGF binds to a receptor called the c-met receptor on the surface of satellite cells, which activates them and helps them proliferate and differentiate to restore damaged muscles. But this repair system loses efficiency with age because of chemical changes that affect the protein.
🧬 Chemical Change and Its Effect on HGF Function
The researchers found that HGF undergoes a process called nitration, in which a nitro group is added to specific sites in the protein, disrupting its shape and its ability to bind to the c-met receptor. The effect is concentrated especially at two sites, Y198 and Y250, resembling the use of a damaged key to open a lock.
This change does not mean that HGF is absent in older adults, but rather that its natural function is reduced because of chemical alterations, which weakens satellite cell activation and muscle repair, and may partially explain age-related loss of muscle strength.
🧪 Studying the Effectiveness of Antioxidant Sulfur Compounds
The researchers focused on two compounds from the trisulfide family with antioxidant properties, namely glutathione trisulfide (GSSSG) and lipoic acid trisulfide (LASSS). Antioxidants work to reduce chemical damage caused by free radicals and reactive molecules in cells.
In laboratory experiments, the compounds reduced the effect of nitration at sensitive HGF sites, but they did not restore the protein’s full ability to bind to the c-met receptor. Therefore, the researchers increased the concentration of trisulfides relative to HGF, resulting in a different and unexpected effect.
⚙️ The Emergence of the “Super HGF” Protein Thanks to LASSS
When the concentration of LASSS was increased, scientists found a major improvement in HGF’s ability to bind to the c-met receptor, as the strength doubled with increased protein impact on the muscle repair process. Moreover, the protein became more resistant to nitration-induced loss of function, especially at site Y198.
It appears that LASSS does not function only as an antioxidant, but also directly modifies the three-dimensional structure of HGF, giving it the enhanced “Super HGF” property, which activates the c-met receptor more strongly and preserves the protein’s vital functions.
🧫 Promising Results in Live Models
The laboratory experiments were initially confirmed in experimental animals, where the researchers used a mouse tail suspension model to study muscle atrophy resulting from disuse. The mice that received LASSS before the experiment showed a notable reduction in HGF nitration compared with their counterparts, reflecting the compound’s ability to protect against chemical damage within living muscles.
The GSSSG compound did not show the same effectiveness in the live study, indicating the specificity of LASSS’s effect.
🔭 Future Prospects and Challenges
Despite the promising initial results, the researchers stress the need for additional studies including aged animals to assess the effect of LASSS on muscle function and its ability to recover fully. The effectiveness of “Super HGF” in improving muscle strength and regenerating muscle mass has not yet been proven.
The research team sees the possibility of using this enhanced natural pathway rather than replacing the biological repair mechanism, which could facilitate the development of treatments that preserve muscle function during aging or long periods of inactivity.
These discoveries also open opportunities in veterinary medicine, especially for caring for aging pets suffering from muscle weakness.
🧾 Conclusion
The discovery of “Super HGF” represents a highly important step in medical biology, highlighting the possibility of enhancing vital repair proteins in a way that may reduce the effects of aging on muscles. The challenge remains to prove safety and effectiveness in future studies, but this direction offers real hope for preserving mobility and independence as age advances.
Source: Scientific Reports
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