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Synovial membrane in the temporomandibular joint--its morphology, function and development
Kayoko Nozawa-Inoue1, Norio Amizuka, Nobuyuki Ikeda
1Division of Oral Anatomy, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan. nozawa@dent.niigata-u.ac.jp
Archives of Histology and Cytology
|December 25, 2003
Summary
This review details temporomandibular joint (TMJ) synovial membrane cells. Macrophage-like (Type A) cells drive inflammation, while fibroblast-like (Type B) cells may link estrogen to TMJ disorders in females.
Area of Science:
- Histology
- Immunology
- Cell Biology
Background:
- The temporomandibular joint (TMJ) synovial membrane's cellular components are crucial for joint health.
- Understanding TMJ synovial lining cells (Type A and Type B) is key to explaining temporomandibular disorders (TMDs).
Purpose of the Study:
- To review current knowledge on the morphology, function, and development of TMJ synovial lining cells.
- To elucidate the roles of Type A and Type B cells in TMJ inflammation and TMD etiology.
Main Methods:
- Electron microscopy to study synovial membrane cell morphology.
- Immunocytochemistry to identify cell types and their specific markers (e.g., macrophage markers, 25kDa heat shock protein, estrogen receptor alpha).
- Analysis of osteopetrotic mice models to trace cell lineage.
Main Results:
- TMJ synovial membrane comprises macrophage-like Type A and fibroblast-like Type B cells, similar to other joints.
- Type A cells increase during inflammation, produce nitric oxide, and originate from monocytes.
- Type B cells exhibit unique processes, possess a basement membrane, and express estrogen receptor alpha, potentially explaining higher TMD prevalence in females.
Conclusions:
- TMJ synovial membrane cell characteristics provide insights into TMJ inflammation and TMD pathogenesis.
- Estrogen receptor alpha expression in Type B cells suggests hormonal influence on TMD development.
- Further understanding of synovial membrane morphology is vital for clarifying TMJ disorder etiology.