Mitoprotective therapy prevents rapid, strain-dependent mitochondrial dysfunction after articular cartilage injury
| Autor: | Hazel H. Szeto, Lawrence J. Bonassar, M.L. Delco, Itai Cohen, Lisa A. Fortier, Lena R. Bartell |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Cartilage
Articular Cellular respiration 0206 medical engineering Strain (injury) 02 engineering and technology Osteoarthritis Mitochondrion Article 03 medical and health sciences 0302 clinical medicine Chondrocytes Medicine Animals Orthopedics and Sports Medicine Mechanotransduction 030203 arthritis & rheumatology Cell Death business.industry Cartilage Depolarization medicine.disease 020601 biomedical engineering Cell biology Mitochondria medicine.anatomical_structure Traumatic injury Cattle Stress Mechanical business |
| Zdroj: | J Orthop Res |
| Popis: | Posttraumatic osteoarthritis (PTOA) involves the mechanical and biological deterioration of articular cartilage that occurs following joint injury. PTOA is a growing problem in health care due to the lack of effective therapies combined with an aging population with high activity levels. Recently, acute mitochondrial dysfunction and altered cellular respiration have been associated with cartilage degeneration after injury. This finding is particularly important because recently developed mitoprotective drugs, including SS peptides, can preserve mitochondrial structure and function after acute injury in other tissues. It is not known, however, if cartilage injury induces rapid structural changes in mitochondria, to what degree mitochondrial dysfunction in cartilage depends on the mechanics of injury or the time frame over which such dysfunction develops. Similarly, it is unknown if SS-peptide treatment can preserve mitochondrial structure and function after cartilage injury. Here, we combined fast camera elastography, longitudinal fluorescence assays, and computer vision techniques to track the fates of thousands of individual cells. Our results show that impact induces mechanically dependent mitochondrial depolarization within a few minutes after injury. Electron microscopy revealed that impact causes rapid structural changes in mitochondria that are related to reduced mitochondrial function, namely, fission and loss of cristae structure. We found that SS-peptide treatment prior to impact protects the mitochondrial structure and preserves mitochondrial function at levels comparable with that of unimpacted control samples. Overall, this study reveals the vital role of mitochondria in mediating cartilage's peracute (within minutes) response to traumatic injury and demonstrates mitoprotection as a promising therapeutic strategy for injury-induced cartilage damage. |
| Databáze: | OpenAIRE |
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