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A protein secreted by skeletal muscle cells that aids in muscle repair and growth

A protein secreted by skeletal muscle cells that aids in muscle repair and growth

 


Scientists at Tokyo Metropolitan University have discovered that a protein called platelet-derived growth factor subunit B (PDGF-B) is continuously secreted by skeletal muscle cells and promotes the proliferation of myoblasts (muscle stem cells), thereby promoting muscle growth. I have found that it helps with healing. Surprisingly, they found that his PDGF-B also helped muscle fiber growth. They confirmed that this corresponds to fibers that contract more strongly. Their findings promise innovative therapies for treating muscle atrophy and injury.

Myokines are small proteins secreted by skeletal muscle cells. They have a wide range of functions and can act on cells both near and far from where they are made. , is thought to play an important role in exercise-related bodily functions, especially in the maintenance of muscle tissue.

A team led by Associate Professor Yasuko Manabe of Tokyo Metropolitan University has studied how myokines influence the behavior of muscle cells. Through extensive experiments, they found that a myokine known as platelet-derived growth factor subunit B or PDGF-B is secreted from skeletal muscle in a constitutive manner, ie, without stimulation. To understand what role it plays, they took myoblasts, the progenitor cells that differentiate into muscle fibers, and exposed them to her PDGF-B. They were able to clearly show that PDGF-B induced greater proliferation of myoblasts.

Interestingly, they also found that PDGF-B affects already differentiated cells. They took myotubes, which are stages of muscle fiber development, and exposed them to the same myokines. Myotubes treated in this manner significantly matured and visibly increased in diameter under microscopy. They also expressed more myosin heavy chain, a key part of the protein structure of myosin, the molecular motor responsible for muscle contraction. It was shown that this directly corresponds to an increase in contractile strength, using a recently developed technique based on . So PDGF-B not only builds muscle, it strengthens it. But this does not mean that both processes are accelerated haphazardly. They noted subtle differences in PDGF-B signaling pathways between myotubes and myoblasts. The team believes that these differences may play a role in the cells switching from proliferative to mature phases.

The team’s research clearly shows that PDGF-B is involved in muscle regeneration, making it an important candidate for developing effective treatments for muscle damage and wasting, as well as regimens that improve muscle performance. It constitutes a big leap.

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Journal reference:

Hamaguchi, H., and others. (2022) PDGF-B secreted from skeletal muscle promotes myoblast proliferation and myotube maturation through activation of the PDGFR signaling cascade. Biochemical and Biophysical Research Communication. doi.org/10.1016/j.bbrc.2022.11.085.

Sources

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2/ https://www.news-medical.net/news/20230116/Protein-secreted-from-skeletal-muscle-cells-and-helps-to-repair-and-grow-muscles.aspx

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