Abstract
Bone repair is one of the major challenges facing reconstructive surgery. Bone regeneration is needed for the repair of large defects and fractures. The ability of TGF-β1 and IGF-1 incorporated into hydrogel scaffold to induce bone regeneration was evaluated in a rat tibia segmental defect model. External fixation was performed prior to the induction of the segmental bone defect in order to stabilize the defect site. Hydrogel scaffold containing either TGF-β, IGF-1, TGF-β + IGF-1, hydrogel containing saline or saline, were inserted in the defect. Calcified material was observed in the defects treated with TGF-β 2 weeks following the start of treatment. Bone defects treated with TGF-β, IGF-1 or TGF-β + IGF-1 revealed significant bone formation after 4 and 6 weeks when compared to the control specimens. X-ray images showed that solid bone was present at the defect site after 6 weeks of treatment with TGF-β or TGF-β + IGF-1. A less pronounced bone induction was observed in the control specimens and bones treated with IGF-1. Percent closure ratio of bone defects after 6 weeks were 40, 80, 89, and 97% for saline, hydrogel, IGF-1, TGF-β and IGF-1 + TGF-β groups, respectively. It is concluded that hydrogel scaffold can serve as a good osteoconductive matrix for growth factors, and that it provides a site for bone regeneration and enhances bone defect healing and could be used as alternative graft material.
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Srouji, S., Blumenfeld, I., Rachmiel, A. et al. Bone defect repair in rat tibia by TGF-β1 and IGF-1 released from hydrogel scaffold. Cell Tissue Banking 5, 223–230 (2004). https://doi.org/10.1007/s10561-004-0503-7
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DOI: https://doi.org/10.1007/s10561-004-0503-7