Abstract
To clarify the contribution of c-fos DNA to bone formation, the effect of constitutive expression of the c-fos gene in collagen synthesis was examined by introducing c-fos DNA into osteoblastic MC3T3-E1 cells. The [ 3H] proline incorporation into the collagenase digestible protein(CDP) and the percent collagen synthesis were significantly decreased in the c-fos transfectants which constitutively express c-fos mRNA as compared with control transfectants. Transcription of type 1(α1) collagen gene was also specifically decreased in the c-fos transfectants. This indicates that constitutive expression of c-fos DNA interferes with bone formation by inhibiting collagen synthesis in osteoblasts.
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