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Articular cartilage collagen: an irreplaceable framework?

D R Eyre1, M A Weis, J-J Wu

  • 1University of Washington, Dept. of Orthopaedics and Sports Medicine, Box 356500, Seattle, WA 98195-6500, USA. deyre@u.washington.edu

European Cells & Materials
|November 4, 2006
PubMed
Summary
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Adult articular cartilage collagen structure is complex, involving types II, IX, and XI. New evidence suggests type III collagen may be incorporated during matrix repair or remodeling.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Connective Tissue Research

Background:

  • Adult articular cartilage is primarily composed of collagen (two-thirds by dry weight).
  • Collagen type II forms the main fibril, with types IX and XI playing crucial roles in its structure and assembly.
  • Mutations in collagen IX (COLIX) and XI (COLXI) genes are linked to chondrodysplasia syndromes, highlighting their importance.

Purpose of the Study:

  • To review current knowledge of collagen assembly in articular cartilage.
  • To present new evidence for the incorporation of collagen type III into adult human articular cartilage.

Main Methods:

  • Literature review on collagen assembly.
  • Analysis of adult human articular cartilage matrix.

Related Experiment Videos

Main Results:

  • Collagen type II, IX, and XI are key components of the nascent type II collagen fibril.
  • New evidence indicates covalent addition of collagen type III to the adult human articular cartilage matrix.

Conclusions:

  • The precise functions of collagens IX and XI in cartilage heteropolymers require further elucidation.
  • The incorporation of collagen type III suggests a role in matrix repair or remodeling processes within adult articular cartilage.