Cyclic mechanical stimulation rescues achilles tendon from degeneration in a bioreactor system

T. Wang, Zhen Lin, M. Ni, Christine Thien, R.E. Day, Bruce Gardiner, Jonas Rubenson, T.B. Kirk, David Smith, Allan Wang, D.G. Lloyd, Y. Wang, Q. Zheng, Minghao Zheng

Research output: Contribution to journalArticle

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Abstract

© 2015 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 33:1888-1896, 2015. © 2015 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. Physiotherapy is one of the effective treatments for tendinopathy, whereby symptoms are relieved by changing the biomechanical environment of the pathological tendon. However, the underlying mechanism remains unclear. In this study, we first established a model of progressive tendinopathy-like degeneration in the rabbit Achilles. Following ex vivo loading deprivation culture in a bioreactor system for 6 and 12 days, tendons exhibited progressive degenerative changes, abnormal collagen type III production, increased cell apoptosis, and weakened mechanical properties. When intervention was applied at day 7 for another 6 days by using cyclic tensile mechanical stimulation (6% strain, 0.25 Hz, 8 h/day) in a bioreactor, the pathological changes and mechanical properties were almost restored to levels seen in healthy tendon. Our results indicated that a proper biomechanical environment was able to rescue early-stage pathological changes by increased collagen type I production, decreased collagen degradation and cell apoptosis. The ex vivo model developed in this study allows systematic study on the effect of mechanical stimulation on tendon biology.
Original languageEnglish
Pages (from-to)1888-1896
JournalJournal of Orthopaedic Research
Volume33
Issue number12
Early online date17 Jul 2015
DOIs
Publication statusPublished - Dec 2015

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Achilles Tendon
Bioreactors
Tendons
Tendinopathy
Apoptosis
Collagen Type III
Collagen Type I
Collagen
Rabbits

Cite this

Wang, T. ; Lin, Zhen ; Ni, M. ; Thien, Christine ; Day, R.E. ; Gardiner, Bruce ; Rubenson, Jonas ; Kirk, T.B. ; Smith, David ; Wang, Allan ; Lloyd, D.G. ; Wang, Y. ; Zheng, Q. ; Zheng, Minghao. / Cyclic mechanical stimulation rescues achilles tendon from degeneration in a bioreactor system. In: Journal of Orthopaedic Research. 2015 ; Vol. 33, No. 12. pp. 1888-1896.
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Cyclic mechanical stimulation rescues achilles tendon from degeneration in a bioreactor system. / Wang, T.; Lin, Zhen; Ni, M.; Thien, Christine; Day, R.E.; Gardiner, Bruce; Rubenson, Jonas; Kirk, T.B.; Smith, David; Wang, Allan; Lloyd, D.G.; Wang, Y.; Zheng, Q.; Zheng, Minghao.

In: Journal of Orthopaedic Research, Vol. 33, No. 12, 12.2015, p. 1888-1896.

Research output: Contribution to journalArticle

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AU - Lin, Zhen

AU - Ni, M.

AU - Thien, Christine

AU - Day, R.E.

AU - Gardiner, Bruce

AU - Rubenson, Jonas

AU - Kirk, T.B.

AU - Smith, David

AU - Wang, Allan

AU - Lloyd, D.G.

AU - Wang, Y.

AU - Zheng, Q.

AU - Zheng, Minghao

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N2 - © 2015 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 33:1888-1896, 2015. © 2015 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. Physiotherapy is one of the effective treatments for tendinopathy, whereby symptoms are relieved by changing the biomechanical environment of the pathological tendon. However, the underlying mechanism remains unclear. In this study, we first established a model of progressive tendinopathy-like degeneration in the rabbit Achilles. Following ex vivo loading deprivation culture in a bioreactor system for 6 and 12 days, tendons exhibited progressive degenerative changes, abnormal collagen type III production, increased cell apoptosis, and weakened mechanical properties. When intervention was applied at day 7 for another 6 days by using cyclic tensile mechanical stimulation (6% strain, 0.25 Hz, 8 h/day) in a bioreactor, the pathological changes and mechanical properties were almost restored to levels seen in healthy tendon. Our results indicated that a proper biomechanical environment was able to rescue early-stage pathological changes by increased collagen type I production, decreased collagen degradation and cell apoptosis. The ex vivo model developed in this study allows systematic study on the effect of mechanical stimulation on tendon biology.

AB - © 2015 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 33:1888-1896, 2015. © 2015 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. Physiotherapy is one of the effective treatments for tendinopathy, whereby symptoms are relieved by changing the biomechanical environment of the pathological tendon. However, the underlying mechanism remains unclear. In this study, we first established a model of progressive tendinopathy-like degeneration in the rabbit Achilles. Following ex vivo loading deprivation culture in a bioreactor system for 6 and 12 days, tendons exhibited progressive degenerative changes, abnormal collagen type III production, increased cell apoptosis, and weakened mechanical properties. When intervention was applied at day 7 for another 6 days by using cyclic tensile mechanical stimulation (6% strain, 0.25 Hz, 8 h/day) in a bioreactor, the pathological changes and mechanical properties were almost restored to levels seen in healthy tendon. Our results indicated that a proper biomechanical environment was able to rescue early-stage pathological changes by increased collagen type I production, decreased collagen degradation and cell apoptosis. The ex vivo model developed in this study allows systematic study on the effect of mechanical stimulation on tendon biology.

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