title: Matrix metalloproteinase and its inhibitor in temporomandibular joint osteoarthrosis after indirect trauma in young goats.
abstract: Our aim was to examine the change in expression of matrix metalloproteinases (MMP-13), matrix metalloproteinases-3 (MMP-3), and tissue inhibitor of matrix metalloproteinase-1 (TIMP-1) in the articular cartilage of goats with experimentally-induced osteoarthrosis of the temporomandibular joint (TMJ) at various times. Osteoarthrosis was induced in 20 goats in the bilateral TMJ and 5 goats acted as controls. There were 5 goats in each group, and a group was killed at 7 days, and 1, 3, and 6 months postoperatively. The samples were collected, and the joints evaluated histologically. Immunofluorescence was used to detect the presence of MMPs and TIMP-1 in the articular disc and condylar cartilage. The ultrastructure of the articular disc and condylar surface at 1 month was examined with scanning electron microscopy (SEM). Osteoarthrosis of the TMJ progressed gradually over time. MMP-13, MMP-3, and TIMP-1 were expressed strongly in the TMJ soon after injury; MMP-13 became gradually weakened, and MMP-3 strengthened later. None of these were expressed in the normal condyle. After a month the surface of the arthrotic condyle was uneven, and the underlying collagen fibrils were exposed in irregular fissures on the surface. The secretion of TIMP-1 was related closely to the changes of MMPs during osteoarthrosis of the TMJ. The unbalanced ratio between them caused degradation of the matrix of the cartilage and might be the cause of osteoarthrosis of the TMJ.
authors.affiliation: Department of Oral Maxillofacial Surgery, Qin Du Stomatology Hospital, Fourth Military Medical University, Xi'an 710032, PR China. Electronic address: wangyanliang@hotmail.com.
authors.forename: Yan-Liang
authors.initials: YL
authors.lastname: Wang
authors.affiliation: Department of Oral Maxillofacial Surgery, Qin Du Stomatology Hospital, Fourth Military Medical University, Xi'an 710032, PR China.
authors.forename: Xin-Jun
authors.initials: XJ
authors.lastname: Li
authors.affiliation: Department of Oral Maxillofacial Surgery, Qin Du Stomatology Hospital, Fourth Military Medical University, Xi'an 710032, PR China.
authors.forename: Rui-Feng
authors.initials: RF
authors.lastname: Qin
authors.affiliation: Department of Oral Maxillofacial Surgery, Qin Du Stomatology Hospital, Fourth Military Medical University, Xi'an 710032, PR China.
authors.forename: De-Lin
authors.initials: DL
authors.lastname: Lei
authors.affiliation: Department of Oral Maxillofacial Surgery, Qin Du Stomatology Hospital, Fourth Military Medical University, Xi'an 710032, PR China.
authors.forename: Yan-Pu
authors.initials: YP
authors.lastname: Liu
authors.affiliation: Department of Oral Maxillofacial Surgery, Qin Du Stomatology Hospital, Fourth Military Medical University, Xi'an 710032, PR China.
authors.forename: Gao-Yi
authors.initials: GY
authors.lastname: Wu
authors.affiliation: Center of Tissue Engineering, Fourth Military Medical University, Xi'an 710032, PR China.
authors.forename: Yong-Jie
authors.initials: YJ
authors.lastname: Zhang
authors.affiliation: Center of Tissue Engineering, Fourth Military Medical University, Xi'an 710032, PR China.
authors.lastname: Yan-Jin
authors.affiliation: Department of Oral Maxillofacial Surgery, Hua Xi Stomatology Hospital, Sichuan University, Cheng Du 610041, PR China.
authors.forename: Da-Zhang
authors.initials: DZ
authors.lastname: Wang
authors.affiliation: Department of Oral Maxillofacial Surgery, Qin Du Stomatology Hospital, Fourth Military Medical University, Xi'an 710032, PR China. Electronic address: wangyanliang@hotmail.com.
authors.forename: Kai-Jin
authors.initials: KJ
authors.lastname: Hu
mesh_terms: D000818:Animals; D002358:Cartilage, Articular / Q000201:enzymology; D002417:Cattle; D006041:Goats; D008297:Male; D008335:Mandibular Condyle / Q000648:ultrastructure; D053509:Matrix Metalloproteinase 13 / Q000032:analysis*; D019278:Matrix Metalloproteinase 3 / Q000032:analysis*; D010003:Osteoarthritis / Q000201:enzymology*; D011817:Rabbits; D013499:Surface Properties; D013704:Temporomandibular Joint / Q000293:injuries / Q000648:ultrastructure; D019224:Temporomandibular Joint Disc / Q000648:ultrastructure; D013705:Temporomandibular Joint Disorders / Q000201:enzymology* / Q000209:etiology; D013997:Time Factors; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000032:analysis*
chemical_list: D019715:Tissue Inhibitor of Metalloproteinase-1; D053509:Matrix Metalloproteinase 13; D019278:Matrix Metalloproteinase 3