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Purification and characterization of a unique osteoinductive factor from bovine bone.

J Biol Chem. 1989 Dec 05;264(34):20805-10
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摘要


A unique protein that promotes ectopic osteoinduction in the rat has been isolated and characterized. Osteoinductive factor (OIF) was extracted from the organic matrix of bovine bone with 4 M guanidine HCl and purified by gel filtration, ion-exchange chromatography, affinity chromatography, and reversed phase high performance liquid chromatography. OIF is a glycoprotein with an apparent molecular mass of 22-28 kDa based on sodium dodecyl sulfate gel electrophoresis. Enzymatic or chemical deglycosylation of OIF reduces its mass to about 12 kDa with apparent loss of activity. OIF activity in the model used is substantially increased by addition of transforming growth factor (TGF)-beta 1 or TGF-beta 2, suggesting an important role for TGF-beta 1 and -2 in bone regeneration and repair. The N-terminal sequence of OIF has no homology to other reported proteins.

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