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Expression of extracellular matrix in human mandibular condyle
H Ishibashi1, Y Takenoshita, K Ishibashi
1Second Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Kyushu University, Fukuoka, Japan.
Summary
Extracellular matrix expression in the human mandibular condyle changes with age. Aging reduces matrix expression, correlating with degenerative changes and osteoarthrosis in the condyle.
Area of Science:
- Biochemistry
- Histology
- Biomaterials Science
Background:
- The extracellular matrix (ECM) is crucial for tissue structure and function.
- Understanding age-related changes in the mandibular condyle's ECM is vital for regenerative medicine and treating temporomandibular joint disorders.
Purpose of the Study:
- To investigate the age-related expression patterns of key ECM components in the human mandibular condyle.
- To correlate these changes with degenerative alterations and aging.
Main Methods:
- Immunohistochemical analysis of 34 human mandibular condyles from autopsy specimens.
- Examined collagens (Types I-V), laminin, fibronectin, fibronectin receptor, and transforming growth factor beta.
- Assessed age-related distribution and expression levels.
Main Results:
- Type I collagen prevalent throughout, with higher expression in articular zones. Types II and III collagen localized in fibrocartilage.
- Type IV collagen, laminin, and transforming growth factor beta found in blood vessel basement membranes and degenerated areas.
- Younger tissues showed stronger ECM expression in degenerative lesions; older tissues exhibited weaker expression and increased osteoarthrosis.
Conclusions:
- ECM expression in the mandibular condyle is closely linked to aging processes.
- Age-related decline in ECM expression correlates with degenerative changes and osteoarthrosis in the condyle.