Participation of Cbfa1 in regulation of chondrocyte maturation

被引:36
作者
Enomoto-Iwamoto, M
Enomoto, H
Komori, T
Iwamoto, M
机构
[1] Osaka Univ, Fac Dent, Dept Biochem, Osaka 5650871, Japan
[2] Osaka Univ, Fac Dent, Dept Oral Anat & Dev Biol, Osaka 5650871, Japan
[3] Osaka Univ, Sch Med, Dept Mol Med, Osaka, Japan
[4] Japan Sci & Technol Corp, Osaka, Japan
关键词
Cbfa1; chondrocyte; endochondral ossification;
D O I
10.1053/joca.2001.0448
中图分类号
R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学(修复外科学)];
学科分类号
摘要
Objective: Cbfa1 is a transcription factor, which is classified into the runt family. The mice lacking this gene display complete loss of bone formation, indicating that Cbfa1 is an essential factor for osteoblast differentiation. The Cbfa1-deficient mice also show an abnormality in cartilage development. Although cartilage anlagens are well formed in these mice, endochondral ossification is blocked, and most of chondrocytes fail to differentiate into their maturation form as characterized by the absence of type X collagen and low levels of alkaline phosphatase activity. It is suggested that Cbfa1 may participate in chondrocyte differentiation. In this study, we have investigated the role of Cbfa1 in chondrocytes during their cytodifferentiation in vitro. Design: To investigate the role of Cbfa1 in regulation of chondrocyte differentiation, we over-expressed Cbfa1 or its dominant negative form in cultured chick chondrocytes using a retrovirus (RCAS)system and examined changes in chondrocyte behaviour induced by the introduced genes. Results: Mature chondrocytes isolated form the cephalic portion of sterna seemed to express Cbfa1 more prominently than immature chondrocytes isolated from the one-third caudal portion of sterna. Over-expression of Cbfa1 in immature chondrocytes strongly stimulated alkaline phosphatase activity and matrix calcification. In contrast, expression of a dominant negative form of Cbfa1, which lacks the C-terminal PST domain, severely inhibited alkaline phosphatase activity and matrix calcification in mature chondrocytes. Conclusion: Taken together with the observation that Cbfa1 transcripts dominantly localized in hypertrophic chondrocytes as well as in osteoblasts, it is suggested that Cbfa1 plays an important role in the progression of chondrocyte maturation. (C) 2001 OsteoArthritis Research Society International.
引用
收藏
页码:S76 / S84
页数:9
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