Exosomes Derived From Mesenchymal Stem Cells Regulating Myotube Cell Atrophy via NF-κB Signaling Pathway

Area of Science:

• Cell Biology
• Regenerative Medicine
• Biochemistry

Background:

• Bone marrow mesenchymal stem cells (BMSCs) are crucial for tissue repair via differentiation and cytokine secretion.
• Exosomes (BMSC-Exos) secreted by BMSCs are increasingly recognized for their role in tissue regeneration.
• The therapeutic potential of BMSC-Exos in conditions like osteoarthritis and muscle injury is being explored.

Purpose of the Study:

• To investigate the protective mechanism of BMSC-Exos against tumor necrosis factor-alpha (TNF-α)-induced muscle atrophy.
• To elucidate how BMSC-Exos affect C2C12 myotube viability, diameter, and key protein expression.

Main Methods:

• C2C12 myotubes were treated with TNF-α to induce atrophy.
• BMSC-Exos were applied to TNF-α-treated myotubes to assess protective effects.
• Expression levels of Atrogin-1, MuRF-1, MyoD, and NF-κB signaling pathway components were analyzed.

Main Results:

• TNF-α treatment significantly reduced myotube viability and diameter.
• BMSC-Exos treatment reversed TNF-α-induced atrophy, increasing viability and diameter.
• BMSC-Exos suppressed the expression of atrophy-related E3 ubiquitin ligases (Atrogin-1, MuRF-1) and increased MyoD expression.
• BMSC-Exos inhibited NF-κB nuclear translocation by reducing phosphorylation of its inhibitors.

Conclusions:

• BMSC-Exos demonstrate a protective effect against TNF-α-induced myotube atrophy.
• The mechanism involves the inhibition of the pro-inflammatory NF-κB pathway.
• BMSC-Exos hold promise for therapeutic strategies targeting muscle atrophy and related inflammatory conditions.