Abstract
TGF beta modulates the growth and differentiation of various cell types, in part by regulating the production of extracellular matrix proteins. In rat osteoblast-like cells TGF beta stimulates the production of collagen, osteopontin and osteonectin. On the other hand, TGF beta inhibits the production of osteocalcin, one of the most abundant non-collagenous bone matrix proteins, which is only expressed in osteoblasts. Inhibition of osteocalcin expression by TGF beta in the rat osteoblastic osteosarcoma, ROS 17/2.8 cells, occurs at least in part through transcriptional control.
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