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Age-associated changes in decorin in rat mandibular condylar cartilage
1Department of Biomedical Sciences, Baylor College of Dentistry, PO Box 660677, Dallas, TX 75266-0677, USA.
Archives of Oral Biology
|April 25, 2000
Summary
Decorin, a small proteoglycan, is present in temporomandibular joint (TMJ) cartilage. Its levels increase with age but remain lower in adult TMJ cartilage compared to limb articular cartilage.
Area of Science:
- Biochemistry
- Biomaterials Science
- Tissue Engineering
Background:
- Decorin is a small proteoglycan that binds collagen fibrils, maintaining tissue integrity.
- Decorin levels increase with age and in response to stress or osteoarthritis in limb cartilage.
Purpose of the Study:
- To characterize decorin presence and amount in temporomandibular joint (TMJ) condylar cartilage during maturation.
- To compare decorin levels and age-related changes in TMJ cartilage with limb articular cartilage.
Main Methods:
- Western blotting to quantify decorin.
- Immunohistochemistry to assess decorin localization.
- Analysis of cartilage from Sprague-Dawley rats at different ages (24-day-old and 161-day-old).
Main Results:
- Decorin was present in TMJ condylar cartilage in both growing and adult rats.
- Decorin levels increased with age in TMJ cartilage, but less significantly than in limb articular cartilage.
- Adult TMJ cartilage had lower decorin content compared to adult limb articular cartilage.
Conclusions:
- Decorin is present in TMJ condylar cartilage, but its abundance and age-related changes differ from limb articular cartilage.
- Maturation-associated changes in decorin levels in the TMJ may be less pronounced than in limb articular cartilage.