Platelet-derived extracellular vesicles ameliorate intervertebral disc degeneration by alleviating mitochondrial...

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Cell Biology

Background:

• Mitochondrial dysfunction, oxidative stress, and inflammation are key drivers of intervertebral disc degeneration (IVDD).
• Restoring mitochondrial function presents a potential therapeutic avenue for IVDD.
• Platelet-derived extracellular vesicles (PEVs) possess anti-inflammatory properties and target inflammatory pathways.

Purpose of the Study:

• To investigate the therapeutic potential of PEVs for treating IVDD.
• To evaluate PEVs' effects on oxidative damage and mitochondrial dysfunction in nucleus pulposus (NP) cells.
• To assess PEVs' efficacy in a rat model of IVDD.

Main Methods:

• Extraction and characterization of PEVs.
• In vitro testing of PEVs on H2O2-induced oxidative damage in NP cells.
• Verification of PEVs' role in repairing mitochondrial dysfunction.
• In vivo evaluation of PEVs in a rat IVDD model.

Main Results:

• PEVs restored mitochondrial function and reduced oxidative stress in NP cells.
• PEVs regulated the SIRT1-PGC1α-TFAM pathway, improving mitochondrial function.
• PEV treatment significantly retarded IVDD progression in a rat model.
• PEVs demonstrated therapeutic effects by restoring cell metabolism.

Conclusions:

• PEVs are a promising therapeutic strategy for intervertebral disc degeneration.
• PEVs effectively target mitochondrial dysfunction and oxidative stress underlying IVDD.
• PEV injection offers a novel approach for managing IVDD patients.