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Dynamic Mechanical Loading Reprograms Meniscus Cell-Derived Extracellular Vesicles to Enhance Their Regenerative

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    Summary
    This summary is machine-generated.

    Physiologic mechanical loading boosts the yield and regenerative power of meniscus fibrochondrocyte-derived extracellular vesicles (MFC-EVs). These "mechanically primed" EVs are enriched with proteins that promote tissue repair, offering a promising therapeutic strategy for meniscus regeneration.

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    Area of Science:

    • Biomaterials Science
    • Regenerative Medicine
    • Tissue Engineering

    Background:

    • The meniscus is vital for knee function, but its poor healing capacity presents a significant challenge for regeneration after injury.
    • Extracellular vesicles (EVs) show therapeutic potential for tissue repair but face limitations in yield and bioactivity for clinical use.
    • Understanding how to enhance EV production and function is crucial for their therapeutic application.

    Purpose of the Study:

    • To investigate the effects of dynamic mechanical loading on the production, composition, and function of meniscus fibrochondrocyte-derived EVs (MFC-EVs).
    • To determine if mechanical stimulation can enhance the regenerative capacity of MFC-EVs for potential therapeutic applications in meniscus repair.

    Main Methods:

    • Meniscus fibrochondrocytes were cultured and subjected to physiologically relevant cyclic tensile loading using a custom bioreactor.
    • EVs were collected, and their production, size, tetraspanin expression, and protein cargo were analyzed.
    • The functional effects of mechanically stimulated EVs on recipient mesenchymal stromal cells (MSCs) were assessed by measuring aggrecan expression.

    Main Results:

    • Mechanical loading significantly increased the production and secretion of MFC-EVs via an ESCRT-independent pathway.
    • Mechanically primed EVs enhanced aggrecan expression in MSCs, indicating improved regenerative function.
    • Proteomic analysis revealed that loaded EVs were enriched in extracellular matrix, cytoskeleton proteins, and pathways involved in tissue morphogenesis and cartilage development.

    Conclusions:

    • Physiologic mechanical loading enhances both the yield and regenerative potency of MFC-EVs.
    • The enhanced bioactivity of loaded EVs is attributed to an enrichment of specific proteins involved in matrix production and tissue development.
    • This study provides a scalable, biologically inspired method for engineering potent EV therapeutics for meniscus repair and broader musculoskeletal regeneration.