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Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.
Regulation of collagenase-3 by bone morphogenetic protein-2 in bone cell cultures.
Endocrinology 1997 March
Bone morphogenetic protein-2 (BMP-2), a member of the transforming growth factor superfamily of peptides, induces ectopic bone formation in vivo. The actions of BMP-2 on osteoblastic cells include stimulation of collagen synthesis, but the role of BMP-2 on collagen degradation is not known. We examined whether BMP-2 affects the expression of collagenase-3, an enzyme that degrades type I collagen at neutral pH, and that of tissue inhibitors of matrix metalloproteinases (TIMPs) in primary osteoblast-enriched cells from 22-day-old fetal rat calvariae. BMP-2 suppressed collagenase messenger RNA (mRNA) and immunoreactive protein levels. BMP-2 did not affect collagenase mRNA stability, but it reduced collagenase heterogeneous nuclear RNA levels and decreased the rate of transcription of the collagenase gene. BMP-2 also stimulated TIMP 1 and TIMP 3 mRNA levels, but failed to alter TIMP 2 expression. In conclusion, our studies indicate that BMP-2 suppresses collagenase-3 gene transcription and stimulates TIMP 1 and TIMP 3 expression in osteoblasts. The regulation of collagenase and TIMPs by BMP-2 in osteoblasts may play a role in osteoinduction.
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