Abstract
Several previous studies of bone repair have shown 2- to 4-fold increases in bone formation following local delivery of exogenous transforming growth factor-beta (TGF-β). Here, we use quantitative backscatter electron microscopy to test the effect of TGF-β1 on mineralization of regenerated bone by examining tissue samples from a previously published canine study in which we found increased bone formation. In the experiment, the proximal humeri of 10 male canines were implanted bilaterally for 28 days with porous-coated implants in the presence of a 3 mm gap between the surface of the implant and the host bone. Implants placed in the left humeri were treated with TGF-β1 at a dose of either 120 μg (n = 5) or 335 μg (n = 5), and the implants placed in the contralateral humeri served as untreated controls. Quantitative backscatter scanning electron microscopy was used to assess the volume fraction of bone and its degree of mineralization in the 3 mm gaps. The calibrated grayscale mean and median values were depressed compared to the controls in the high dose group (p = 0.048 and p = 0.041, respectively), suggesting that high dose TGF-β delayed or inhibited mineralization of newly formed osteoid.
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Acknowledgments
NIH Grant AR42862 and the Grainger Foundation. Implants were donated by Zimmer-USA. Ms. Vicki Kalscheur, School of Veterinary Medicine, University of Wisconsin, Madison, was instrumental in preparing the specimen surfaces.
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Broderick, E., Infanger, S., Turner, T. et al. Depressed Bone Mineralization Following High Dose TGF-β1 Application in an Orthopedic Implant Model. Calcif Tissue Int 76, 379–384 (2005). https://doi.org/10.1007/s00223-004-0150-9
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DOI: https://doi.org/10.1007/s00223-004-0150-9