Alterations of overused supraspinatus tendon: a possible role of glycosaminoglycans and HARP/pleiotrophin in early tendon pathology.
Publication year
2012Source
Journal of Orthopaedic Research, 30, 1, (2012), pp. 61-71ISSN
Annotation
01 januari 2012
Publication type
Article / Letter to editor
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Organization
Nephrology
Biochemistry (UMC)
Journal title
Journal of Orthopaedic Research
Volume
vol. 30
Issue
iss. 1
Page start
p. 61
Page end
p. 71
Subject
NCMLS 3: Tissue engineering and pathology N4i 4: Auto-immunity, transplantation and immunotherapy; NCMLS 3: Tissue engineering and pathology ONCOL 3: Translational researchAbstract
Supraspinatus tendon overuse injuries lead to significant pain and disability in athletes and workers. Despite the prevalence and high social cost of these injuries, the early pathological events are not well known. We analyzed the potential relation between glycosaminoglycan (GAG) composition and phenotypic cellular alteration using a rat model of rotator cuff overuse. Total sulfated GAGs increased after 4 weeks of overuse and remained elevated up to 16 weeks. GAG accumulation was preceded by up-regulation of decorin, versican, and aggrecan proteoglycans (PGs) mRNAs and proteins and biglycan PG mRNA after 2 weeks. At 2 weeks, collagen 1 transcript decreased whereas mRNAs for collagen 2, collagen 3, collagen 6, and the transcription factor Sox9 were increased. Protein levels of heparin affine regulatory peptide (HARP)/pleiotrophin, a cytokine known to regulate developmental chondrocyte formation, were enhanced especially at 4 weeks, without up-regulation of HARP/pleiotrophin mRNA. Further results suggest that the increased GAGs present in early lesions may sequester HARP/pleiotrophin, which could contribute to a loss of tenocyte's phenotype. All these modifications are characteristic of a shift towards the chondrocyte phenotype. Identification of these early changes in the extra-cellular matrix may help to prevent the progression of the pathology to more disabling, degenerative alterations.
This item appears in the following Collection(s)
- Academic publications [238441]
- Faculty of Medical Sciences [90373]
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