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Published online 2 April 2001. doi:10.1083/jcb.153.1.87
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© The Rockefeller University Press, 0021-9525/2001/4/87/ $5.00
The Journal of Cell Biology, Volume 153, Number 1, April 2, 2001 87-100


Original Article

Skeletal Malformations Caused by Overexpression of Cbfa1 or Its Dominant Negative Form in Chondrocytes

Chisato Uetaa, Masahiro Iwamotob, Naoko Kanatania, Carolina Yoshidaa,c, Yang Liua, Motomi Enomoto-Iwamotod, Tomoharu Ohmorib, Hirayuki Enomotoa, Ken Nakatae, Kenji Takadac, Kojiro Kurisub, and Toshihisa Komoria,f
a Department of Molecular Medicine, Osaka University Medical School, Suita, Osaka 565-0871, Japan
b Department of Oral Anatomy and Developmental Biology, Osaka University Faculty of Dentistry, Suita, Osaka 565-0871, Japan
c Department of Orthodontics and Dentofacial Orthopedics, Osaka University Faculty of Dentistry, Suita, Osaka 565-0871, Japan
d Department of Biochemistry, Osaka University Faculty of Dentistry, Suita, Osaka 565-0871, Japan
e Orthopedic Sports Medicine, Kansai Rosai Hospital, Amagasaki, Hyogo 660-8511, Japan
f Form and Function, Precursory Research for Embryonic Science and Technology, Japan Science and Technology Corporation, Suita, Osaka 565-0871, Japan

Correspondence to: Toshihisa Komori, Department of Molecular Medicine, Osaka University Medical School, 2-2 Yamada-oka Suita, Osaka 565-0871, Japan. Tel:81-6-6879-7590 Fax:81-6-6879-7796 E-mail:komorit{at}imed3.med.osaka-u.ac.jp.

During skeletogenesis, cartilage develops to either permanent cartilage that persists through life or transient cartilage that is eventually replaced by bone. However, the mechanism by which cartilage phenotype is specified remains unclarified. Core binding factor {alpha}1 (Cbfa1) is an essential transcription factor for osteoblast differentiation and bone formation and has the ability to stimulate chondrocyte maturation in vitro. To understand the roles of Cbfa1 in chondrocytes during skeletal development, we generated transgenic mice that overexpress Cbfa1 or a dominant negative (DN)-Cbfa1 in chondrocytes under the control of a type II collagen promoter/enhancer. Both types of transgenic mice displayed dwarfism and skeletal malformations, which, however, resulted from opposite cellular phenotypes. Cbfa1 overexpression caused acceleration of endochondral ossification due to precocious chondrocyte maturation, whereas overexpression of DN-Cbfa1 suppressed maturation and delayed endochondral ossification. In addition, Cbfa1 transgenic mice failed to form most of their joints and permanent cartilage entered the endochondral pathway, whereas most chondrocytes in DN-Cbfa1 transgenic mice retained a marker for permanent cartilage. These data show that temporally and spatially regulated expression of Cbfa1 in chondrocytes is required for skeletogenesis, including formation of joints, permanent cartilages, and endochondral bones.

Key Words: chondrocyte, Cbfa1, transgenic mice, endochondral ossification, permanent cartilage


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