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  • Doxycycline preserves chondrocyte viability and function in human and calf articular cartilage ex vivo. Physiological reports Yue, L., Vuong, B., Yao, H., Owens, B. D. 2020; 8 (17): e14571

    Abstract

    Prolonging chondrocyte survival is essential to ensure fresh osteochondral (OC) grafts for treatment of articular cartilage lesions. Doxycycline has been shown to enhance cartilage growth, disrupt terminal differentiation of chondrocytes, and inhibit cartilage matrix degradation. It is unknown whether doxycycline prolongs chondrocyte survival in OC grafts. We hypothesized that doxycycline protects against chondrocyte death and maintains function of articular cartilage. To test this hypothesis, we employed human and calf articular cartilages, and incubated chondrocytes isolated from cartilage or cartilage plugs with doxycycline (0, 1 or 10?g/ml) at either 37C or 4C. Chondrocyte viability, apoptosis, glycosaminoglycan (GAG), collagen, and mechanical test in cartilage plugs were measured. We found that reduced chondrocyte viability, increased chondrocyte apoptosis, reduced GAG contents, and impaired equilibrium modulus in cartilage plugs were observed in a time-dependent manner at both 37C and 4C. Chondrocyte viability was further reduced when the plugs were cultured at 4C as compared to 37C. Doxycycline prolonged viability and reduced apoptosis of chondrocytes during culture of cartilage plugs. Functionally, doxycycline protected against reduced production of GAG and collagen II as well as impaired mechanical properties in cartilage plugs during culture. Mechanistically, doxycycline increased mitochondrial respiration in cultured chondrocytes. In conclusion, preservation at 37C is beneficial for maintaining chondrocyte viability in cartilage plugs compared to 4C. Incubation of doxycycline protects against chondrocyte apoptosis, reduced extracellular matrix, and impaired mechanical properties in cartilage plugs. The findings provide a potential approach using doxycycline at 37C to preserve chondrocyte viability in fresh OC grafts for treatment of articular cartilage lesions.

    View details for DOI 10.14814/phy2.14571

    View details for PubMedID 32918797

    View details for PubMedCentralID PMC7507091

  • Growth of The Pediatric Knee Meniscus: A Cadaveric Study Orthopaedic Journal of Sports Medicine Vuong, B., Segovia, N., Randhawa, S., Trivedi, S., Tran, E., Chen, A., Shea, K. 2020; 8 (7)

    View details for DOI 10.1177/2325967120S00445

  • Getting there and staying there: supporting and enabling persistent human life on Mars using synthetic natural rubber, self-healing materials, and biological batteries PLOS Synthetic Biology Acharya, N., Baker, N., Bravo, M. K., Gu, K., Harken, S., Herschl, M. H., Petersen, A., Pirozzi, I., Spangle, D., Sun, G., Vuong, B., Averesch, N. J., Fujishima, K., Kalkus, T. J., Rogers, K. J., Rothschild, L. J. 2018

    View details for DOI 10.1101/345496

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