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Inflammatory cells do not decrease the ultimate tensile strength of intact tendons in vivo and in vitro: protective role of mechanical loading

Marsolais David, Duchesne Élise, Côté Claude H. et Frenette Jérôme. (2007). Inflammatory cells do not decrease the ultimate tensile strength of intact tendons in vivo and in vitro: protective role of mechanical loading. Journal of Applied Physiology, 102, (1), p. 11-17.

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URL officielle: https://doi.org/10.1152/japplphysiol.00162.2006

Résumé

Although inflammatory cells and their products are involved in various pathological processes, a possible role in tendon dysfunction has never been convincingly confirmed and extensively investigated. The goal of this study was to determine whether or not an acute inflammatory process deprived of mechanical trauma can induce nonspecific damages to intact collagen fibers. To induce leukocyte accumulation, carrageenan was injected into rat Achilles tendons. We first tested the effect of leukocyte recruitment on the concentrations or activities of matrix metalloproteinases and tissue inhibitors of matrix metalloproteinases. Second, we analyzed at the biochemical, histological, and biomechanical levels the impact of leukocyte invasion on tendons. Finally, collagen bundles isolated from rat-tail tendons were exposed in vitro to mechanical stress and/or inflammatory cells to determine if mechanical loading could protect tendons from the leukocyte proteolytic activity. Carrageenan-induced leukocyte accumulation was associated with an increased matrix metalloproteinase activity and a decreased content of tissue inhibitors of matrix metalloproteinases. However, hydroxyproline content and load to failure did not change significantly in these tendons. Interestingly, mechanical stress, when applied in vitro, protected collagen bundles from inflammatory cell-induced deterioration. Together, our results suggest that acute inflammation does not induce damages to intact and mechanically stressed collagen fibers. This protective effect would not rely on increased tissue inhibitors of matrix metalloproteinases content but would rather be conferred to the intrinsic resistance of mechanically loaded collagen fibers to proteolytic degradation.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:102
Numéro:1
Pages:p. 11-17
Version évaluée par les pairs:Oui
Date:2007
Sujets:Sciences de la santé
Sciences de la santé > Sciences de l'activité physique et réadaptation
Sciences de la santé > Sciences de l'activité physique et réadaptation > Physiothérapie
Département, module, service et unité de recherche:Départements et modules > Département des sciences de la santé > Unité d'enseignement en physiothérapie
Mots-clés:Collagen, leukocytes, inflammation, tendinopathy, tendon, tensile strenght, metabolism, inflammatory, macrophages, matrix metalloproteinases, neutrophils, tissue inhibitors of metalloproteinase
Déposé le:15 mars 2019 00:50
Dernière modification:15 mars 2019 00:50
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