Tendon extracellular matrix damage, degradation and inflammation in response to in-vitro overload exercise

Spiesz, Ewa, Thorpe, Chavaunne, Chaudhry, Saira, Riley, Graham, Birch, Helen, Clegg, Peter ORCID: 0000-0003-0632-0032 and Screen, Hazel (2015) Tendon extracellular matrix damage, degradation and inflammation in response to in-vitro overload exercise. Journal of Orthopaedic Research, 33 (6). pp. 889-897.

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Abstract

The role of inflammation in tendon injury is uncertain and a topic of current interest. In vitro studies of tendon accelerated overload damage can serve as a valuable source of information on the early stages of tendinopathy. Viable fascicle bundles from bovine flexor tendons were subjected to cyclic uniaxial loading from 1-10% strain. Immunostaining for inflammatory markers and matrix degradation markers was performed on the samples after mechanical testing. Loaded samples exhibited visible extracellular matrix damage, with disrupted collagen fibres and fibre kinks, and notable damage to the interfascicular matrix. Inflammatory markers COX-2 and IL-6 were only expressed in the cyclically loaded samples. Collagen degradation markers MMP-1 and C1,2C were colocalised in many areas, with staining occurring in the interfascicular matrix or the fascicular tenocytes. These markers were present in control samples, but staining became increasingly intense with loading. Little MMP-3 or MMP-13 was evident in control sections. In loaded samples, some sections showed intense staining of these markers, again localised to interfascicular regions. This study suggests that inflammatory markers may be expressed rapidly after tendon overload exercise. Interestingly, both inflammation and damage-induced matrix remodelling seem to be concentrated in, or in the vicinity of, the highly cellular interfascicular matrix.

Item Type:	Article
Uncontrolled Keywords:	Tendon, Fatigue, Inflammation, Matrix degradation, ECM damage, Interfascicular matrix, Collagen
Depositing User:	Symplectic Admin
Date Deposited:	15 Apr 2015 14:34
Last Modified:	01 Mar 2023 19:43
DOI:	10.1002/jor.22879
Open Access URL:	https://doi.org/10.1002/jor.22879
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/2009951