Abstract
Rotator cuff tears are common musculoskeletal injuries that can cause significant pain and disability. While the clinical results of rotator cuff repair can be good, failure of tendon healing remains a significant problem. Molecular mechanisms underlying structural failure following surgical repair remain unclear. Histologically, enhanced inflammation, disorganization of the collagen fibers, calcification, apoptosis and tissue necrosis affect the normal healing process. Mesenchymal stem cells (MSCs) have the ability to provide improved healing following rotator cuff repair via the release of mediators from secreted 30–100 nm extracellular vesicles called exosomes. They carry regulatory proteins, mRNA and miRNA and have the ability to increase collagen synthesis and angiogenesis through increased expression of mRNA and release of proangiogenic factors and regulatory proteins that play a major role in proper tissue remodeling and preventing extracellular matrix degradation. Various studies have shown the effect of exosomes on improving outcome of cutaneous wound healing, scar tissue formation, degenerative bone disease and Duchenne Muscular Dystrophy. In this article, we critically reviewed the potential role of exosomes in tendon regeneration and propose the novel use of exosomes alone or seeded onto biomaterial matrices to stimulate secretion of favorable cellular factors in accelerating the healing response following rotator cuff repair.
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Acknowledgements
This work was supported primarily by the State of Nebraska LB506 Grant to DKA and LB692 Grant to MFD by Creighton University. The research work of DKA is also supported by Grants R01HL120659 and R01HL144125 from the National Institutes of Health (NIH). The content of this original research article is solely the responsibility of the authors and does not necessarily represent the official views of the NIH or the State of Nebraska.
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Connor, D.E., Paulus, J.A., Dabestani, P.J. et al. Therapeutic potential of exosomes in rotator cuff tendon healing. J Bone Miner Metab 37, 759–767 (2019). https://doi.org/10.1007/s00774-019-01013-z
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DOI: https://doi.org/10.1007/s00774-019-01013-z