Distribution of pericellular matrix molecules in the temporomandibular joint and their chondroprotective effects against inflammation
- Author:
Chu Cui WERN
1
;
Zhang SHIPIN
;
Sng J TIMOTHY
;
Ong Jie YU
;
Tan WEN-LI
;
Ang Y VIVIEN
;
Foldager B CASPER
;
Toh Seong WEI
Author Information
1. Faculty of Dentistry
- Keywords:
cartilage;
chondrocytes;
collagen Ⅵ;
collagen Ⅵ;
inflammation;
laminin;
pericellular matrix;
temporomandibular joint
- From:
International Journal of Oral Science
2017;9(1):43-52
- CountryChina
- Language:Chinese
-
Abstract:
The objectives of this study were to (1) determine the distribution and synthesis of pericellular matrix (PCM) molecules (collagen Ⅵ, collagen Ⅳ and laminin) in rat temporomandibular joint (TMJ) and (2) investigate the effects of PCM molecules on chondrocytes against inflammation in osteoarthritis. Four zones (fibrous, proliferating, mature and hypertrophic) of condylar cartilage and three bands (anterior, intermediate and posterior) of disc were analysed by immunohistochemistry for the presence of PCM molecules in rat TMJs. Isolated chondrocytes were pre-treated with PCM molecules before being subjected to interleukin (IL)-1β treatment to stimulate inflammation. The responses of the chondrocytes were analysed using gene expression, nitric oxide release and matrix metalloproteinase (MMP)-13 production measures. Histomorphometric analyses revealed that the highest areal deposition of collagen Ⅵ (67.4%), collagen Ⅳ (45.7%) and laminin (52.4%) was in the proliferating zone of TMJ condylar cartilage. No significant difference in the distribution of PCM molecules was noted among the three bands of the TMJ disc. All three PCM molecules were expressed intracellularly by chondrocytes cultured in the monolayer. Among the PCM molecules, pre-treatment with collagen Ⅵ enhanced cellular proliferation, ameliorated IL-1β-induced MMP-3, MMP-9, MMP-13 and inducible nitric oxide synthase gene expression, and attenuated the downregulation of cartilage matrix genes, including collagen Ⅰ, aggrecan and cartilage oligomeric matrix protein (COMP). Concurrently, collagen Ⅵ pretreatment inhibited nitric oxide and MMP-13 production. Our study demonstrates for the first time the distribution and role of PCM molecules, particularly collagen Ⅵ, in the protection of chondrocytes against inflammation.
