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Ultrastructural immunolocalization of cartilage oligomeric matrix protein (COMP) in relation to collagen fibrils in the equine tendon

Sodersten, F; Ekman, S; Eloranta, ML; Heinegård, Dick LU ; Dudhia, J and Hultenby, K (2005) In Matrix Biology 24(5). p.376-385
Abstract
The structure and organisation of the extracellular matrix, and in particular the axial alignment of type I collagen fibrils, are essential for the tensile strength of tendons. The resident tenocytes synthesize and maintain the composition of the extracellular matrix, which changes with age and maturation. Other components of the extracellular matrix include less abundant collagen types II, III, V, VI, XII, proteoglycans and glycoproteins. Cartilage oligomeric matrix protein (COMP) is an abundant non-collagenous pentameric glycoprotein in the tendon, which can bind to collagen types I and II. The function of COMP in the tendon is not clear, but it may act as a catalyst in fibrillogenesis. Its concentration changes with age, maturation and... (More)
The structure and organisation of the extracellular matrix, and in particular the axial alignment of type I collagen fibrils, are essential for the tensile strength of tendons. The resident tenocytes synthesize and maintain the composition of the extracellular matrix, which changes with age and maturation. Other components of the extracellular matrix include less abundant collagen types II, III, V, VI, XII, proteoglycans and glycoproteins. Cartilage oligomeric matrix protein (COMP) is an abundant non-collagenous pentameric glycoprotein in the tendon, which can bind to collagen types I and II. The function of COMP in the tendon is not clear, but it may act as a catalyst in fibrillogenesis. Its concentration changes with age, maturation and load. The present study delineates the ultrastructural distribution of COMP and its correlation to collagen fibril thickness in different compartments in two flexor tendons from horses of different ages (foetus, 8 months, 3 years, 12 years). The immunolabeling for COMP was higher in the superficial digital flexor tendon compared with the deep digital flexor tendon and it increased with the age of the animal, with the highest concentration in the 3-year-olds. Fibril diameter differed between age groups and a more homogenous fibril population was found in the fetal tendons. A positive correlation between high COMP immunolabeling and the percentage of small fibrils (<60 nm) were present in the SDFT. COMP immunolabeling was enriched at the gap region of the collagen fibril. In situ hybridization revealed the strongest expression in tendons from the 3-year-old horses whereas there was no expression in foetal tendon. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ultrastructure, collagen, COMP, tendon, equine
in
Matrix Biology
volume
24
issue
5
pages
376 - 385
publisher
Elsevier
external identifiers
  • wos:000231205300008
  • scopus:22544435541
ISSN
1569-1802
DOI
10.1016/j.matbio.2005.06.003
language
English
LU publication?
yes
id
4baf6b2e-09d1-47b0-aa71-33fe49fe3bda (old id 229584)
date added to LUP
2007-10-05 14:56:40
date last changed
2017-10-22 04:45:54
@article{4baf6b2e-09d1-47b0-aa71-33fe49fe3bda,
  abstract     = {The structure and organisation of the extracellular matrix, and in particular the axial alignment of type I collagen fibrils, are essential for the tensile strength of tendons. The resident tenocytes synthesize and maintain the composition of the extracellular matrix, which changes with age and maturation. Other components of the extracellular matrix include less abundant collagen types II, III, V, VI, XII, proteoglycans and glycoproteins. Cartilage oligomeric matrix protein (COMP) is an abundant non-collagenous pentameric glycoprotein in the tendon, which can bind to collagen types I and II. The function of COMP in the tendon is not clear, but it may act as a catalyst in fibrillogenesis. Its concentration changes with age, maturation and load. The present study delineates the ultrastructural distribution of COMP and its correlation to collagen fibril thickness in different compartments in two flexor tendons from horses of different ages (foetus, 8 months, 3 years, 12 years). The immunolabeling for COMP was higher in the superficial digital flexor tendon compared with the deep digital flexor tendon and it increased with the age of the animal, with the highest concentration in the 3-year-olds. Fibril diameter differed between age groups and a more homogenous fibril population was found in the fetal tendons. A positive correlation between high COMP immunolabeling and the percentage of small fibrils (&lt;60 nm) were present in the SDFT. COMP immunolabeling was enriched at the gap region of the collagen fibril. In situ hybridization revealed the strongest expression in tendons from the 3-year-old horses whereas there was no expression in foetal tendon.},
  author       = {Sodersten, F and Ekman, S and Eloranta, ML and Heinegård, Dick and Dudhia, J and Hultenby, K},
  issn         = {1569-1802},
  keyword      = {ultrastructure,collagen,COMP,tendon,equine},
  language     = {eng},
  number       = {5},
  pages        = {376--385},
  publisher    = {Elsevier},
  series       = {Matrix Biology},
  title        = {Ultrastructural immunolocalization of cartilage oligomeric matrix protein (COMP) in relation to collagen fibrils in the equine tendon},
  url          = {http://dx.doi.org/10.1016/j.matbio.2005.06.003},
  volume       = {24},
  year         = {2005},
}