BMSC-Exosomes Combined With TGF-β1 Enhance Meniscal Fibrochondrocyte Function: Implications for Cartilage Repair

Area of Science:

• Regenerative Medicine
• Biotechnology
• Cell Biology

Background:

• Adult meniscal fibrochondrocytes (MFCs) have limited healing capacity due to low proliferation and repair potential.
• Bone marrow mesenchymal stem cell-derived exosomes (BMSC-Exos) offer regenerative potential as cell-free therapeutics.
• Transforming growth factor-β1 (TGF-β1) is a known factor promoting cartilage formation.

Purpose of the Study:

• To investigate the synergistic effects of BMSC-Exos and TGF-β1 on MFCs.
• To explore novel therapeutic strategies for meniscus injuries.

Main Methods:

• BMSC-Exos were isolated and characterized using TEM, NTA, and western blotting.
• MFCs were treated with BMSC-Exos, TGF-β1, or a combination thereof.
• Cell proliferation, migration, and DNA content were assessed using CCK-8, DNA quantification, cell migration, and scratch assays.

Main Results:

• BMSC-Exos were confirmed as approximately 118 nm particles expressing TSG101 and localized within MFCs.
• Combined BMSC-Exos and TGF-β1 treatment significantly enhanced MFC proliferation and migration compared to individual treatments.
• DNA content in MFCs was highest in the combined treatment group (p < 0.001).

Conclusions:

• The combination of BMSC-Exos and TGF-β1 effectively promotes MFC proliferation and migration.
• This synergistic approach presents a promising new strategy for treating meniscus injuries.