1. Contribution of runt-related transcription factor 2 to the pathogenesis of osteoarthritis in mice after induction of knee joint instability.
- Author
-
Kamekura S, Kawasaki Y, Hoshi K, Shimoaka T, Chikuda H, Maruyama Z, Komori T, Sato S, Takeda S, Karsenty G, Nakamura K, Chung UI, and Kawaguchi H
- Subjects
- Animals, Cartilage, Articular pathology, Collagen Type X genetics, Collagen Type X metabolism, Collagenases genetics, Collagenases metabolism, Core Binding Factor Alpha 1 Subunit deficiency, Core Binding Factor Alpha 1 Subunit genetics, Disease Models, Animal, Gene Deletion, Joint Instability complications, Joint Instability pathology, Matrix Metalloproteinase 13, Medial Collateral Ligament, Knee injuries, Medial Collateral Ligament, Knee surgery, Menisci, Tibial surgery, Mice, Mice, Inbred C57BL, Mice, Knockout, Osteoarthritis etiology, Osteoarthritis pathology, RNA, Messenger metabolism, Stifle injuries, Stifle pathology, Stifle surgery, Tibial Meniscus Injuries, Cartilage, Articular metabolism, Core Binding Factor Alpha 1 Subunit metabolism, Joint Instability metabolism, Osteoarthritis metabolism
- Abstract
Objective: By producing instability in mouse knee joints, we attempted to determine the involvement of runt-related transcription factor 2 (RUNX-2), which is required for chondrocyte hypertrophy, in the development of osteoarthritis (OA)., Methods: An experimental mouse OA model was created by surgical transection of the medial collateral ligament and resection of the medial meniscus of the knee joints of heterozygous RUNX-2-deficient (Runx2+/-) mice and wild-type littermates. Cartilage destruction and osteophyte formation in the medial tibial cartilage were compared by histologic and radiographic analyses. Localization of type X collagen and matrix metalloproteinase 13 (MMP-13) was examined by immunohistochemistry. Localization of RUNX-2 was determined by X-Gal staining in heterozygous RUNX-2-deficient mice with the lacZ gene insertion at the Runx2-deletion site (Runx2+/lacZ). Messenger RNA levels of type X collagen, MMP-13, and RUNX-2 were examined by real-time reverse transcriptase-polymerase chain reaction analysis., Results: RUNX-2 was induced in the articular cartilage of wild-type mice at the early stage of OA, almost simultaneously with type X collagen but earlier than MMP-13. Runx2+/- and Runx2+/lacZ mice showed normal skeletal development and articular cartilage; however, after induction of knee joint instability, they exhibited decreased cartilage destruction and osteophyte formation, along with reduced type X collagen and MMP-13 expression, as compared with wild-type mice., Conclusion: RUNX-2 contributes to the pathogenesis of OA through chondrocyte hypertrophy and matrix breakdown after the induction of joint instability.
- Published
- 2006
- Full Text
- View/download PDF