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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Recombinant transforming growth factor type beta 3: biological activities and receptor-binding properties in isolated bone cells.

We have recently cloned the cDNA for transforming growth factor type beta 3 ( TGF-beta 3), a new member of the TGF-beta gene family. We examined the biological effects of recombinant TGF-beta 3 protein in osteoblast-enriched bone cell cultures. In this report we demonstrate that TGF-beta 3 is a potent regulator of functions associated with bone formation, i.e., mitogenesis, collagen synthesis, and alkaline phosphatase activity. In a direct comparison between TGF-beta 3 and TGF-beta 1, TGF-beta 3 appeared to be three- to fivefold more potent than TGF-beta 1. Our cross-linking experiments with iodinated TGF-beta showed that in osteoblast-enriched bone cell cultures, both TGF-beta 3 and TGF-beta 1 associated with the same three cell surface binding sites. Scatchard analysis of receptor competition studies indicated the presence of high-affinity binding sites for TGF-beta 3 in the picomolar range. TGF-beta 3 showed an approximately fourfold-higher apparent affinity than TGF-beta 1 in overall binding.[1]

References

  1. Recombinant transforming growth factor type beta 3: biological activities and receptor-binding properties in isolated bone cells. ten Dijke, P., Iwata, K.K., Goddard, C., Pieler, C., Canalis, E., McCarthy, T.L., Centrella, M. Mol. Cell. Biol. (1990) [Pubmed]
 
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