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Lubricin reduces cartilage--cartilage integration.
Dirk B Schaefer1, David Wendt, Matteo Moretti
1Departments of Surgery and of Research, University Hospital Basel, Switzerland.
Biorheology
|August 10, 2004
Summary
Lubricin, a protein in synovial fluid, impairs cartilage repair. This study shows lubricin significantly reduces cartilage integration strength, hindering natural healing processes.
Area of Science:
- Biomedical Engineering
- Orthopedics
- Tissue Engineering
Background:
- Cartilage defects typically do not heal in vivo due to limited chondrocyte access and potential exogenous factors.
- The role of synovial fluid components in cartilage repair remains incompletely understood.
Purpose of the Study:
- To investigate the hypothesis that lubricin, a key component of synovial fluid, negatively impacts cartilage integration capacity.
- To assess the effect of lubricin on the adhesive strength and histological integration of cartilage composites.
Main Methods:
- Bovine articular cartilage disk/ring composites were created and cultured for 6 weeks.
- Composites were treated with or without lubricin (250 microg/ml, thrice weekly).
- Integration was assessed via light microscopy for contact area and push-out mechanical tests for adhesive strength. Histological analysis (Safranin-O staining) was also performed.
Main Results:
- No significant difference in contact area was observed between lubricin-treated and control groups.
- Lubricin treatment significantly reduced the adhesive strength of the integration interface (2.5 kPa vs. 28.7 kPa in controls).
- Histological examination confirmed reduced cartilage integration in lubricin-treated specimens.
Conclusions:
- Synovial fluid's lubricating properties, specifically lubricin, may impair cartilage-cartilage integration.
- These findings suggest that lubrication, while beneficial for joint function, could hinder the intrinsic repair capacity of cartilage.