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Molecular and Cellular Biology, June 1999, p. 4431-4442, Vol. 19, No. 6
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Collagenase 3 Is a Target of Cbfa1, a Transcription Factor of the runt Gene Family Involved in Bone Formation

Maria J. G. Jiménez,1 Milagros Balbín,1 José M. López,2 Jesús Alvarez,2 Toshihisa Komori,3 and Carlos López-Otín1,*

Departamento de Bioquímica y Biología Molecular1 and Departamento de Morfología y Biología Celular,2 Facultad de Medicina, Universidad de Oviedo, 33006 Oviedo, Spain, and Department of Medicine III, Osaka University Medical School, Suita, Osaka 565, Japan3

Received 27 July 1998/Returned for modification 8 September 1998/Accepted 8 March 1999

Collagenase 3 (MMP-13) is a recently identified member of the matrix metalloproteinase (MMP) gene family that is expressed at high levels in diverse human carcinomas and in articular cartilage from arthritic patients. In addition to its expression in pathological conditions, collagenase 3 has been detected in osteoblasts and hypertrophic chondrocytes during fetal ossification. In this work, we have evaluated the possibility that Cbfa1 (core binding factor 1), a transcription factor playing a major role in the expression of osteoblastic specific genes, is involved in the expression of collagenase 3 during bone formation. We have functionally characterized a Cbfa motif present in the promoter region of collagenase 3 gene and demonstrated, by cotransfection experiments and gel mobility shift assays, that this element is involved in the inducibility of the collagenase 3 promoter by Cbfa1 in osteoblastic and chondrocytic cells. Furthermore, overexpression of Cbfa1 in osteoblastic cells unable to produce collagenase 3 leads to the expression of this gene after stimulation with transforming growth factor beta . Finally, we show that mutant mice deficient in Cbfa1, lacking mature osteoblasts but containing hypertrophic chondrocytes which are also a major source of collagenase 3, do not express this protease during fetal development. These results provide in vivo evidence that collagenase 3 is a target of the transcriptional activator Cbfa1 in these cells. On the basis of these transcriptional regulation studies, together with the potent proteolytic activity of collagenase 3 on diverse collagenous and noncollagenous bone and cartilage components, we proposed that this enzyme may play a key role in the process of bone formation and remodeling.

* Corresponding author. Mailing address: Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Universidad de Oviedo, 33006 Oviedo, Spain. Phone: 34-985-104201. Fax: 34-985-103564. E-mail: CLO{at}dwarf1.quimica.uniovi.es.

Molecular and Cellular Biology, June 1999, p. 4431-4442, Vol. 19, No. 6
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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