The use of silk fibroin/hydroxyapatite composite co-cultured with rabbit bone-marrow stromal cells in the healing of a segmental bone defect.
In a rabbit model we investigated the efficacy of a silk fibroin/hydroxyapatite (SF/HA) composite on the repair of a segmental bone defect. Four types of porous SF/HA composites (SF/HA-1, SF/HA-2, SF/HA-3, SF/HA-4) with different material ratios, pore sizes, porosity and additives were implanted subcutaneously into Sprague-Dawley rats to observe biodegradation. SF/HA-3, which had characteristics more suitable for a bone substitute based on strength and resorption was selected as a scaffold and co-cultured with rabbit bone-marrow stromal cells (BMSCs). A segmental bone defect was created in the rabbit radius. The animals were randomised into group 1 (SF/HA-3 combined with BMSCs implanted into the bone defect), group 2 (SF/HA implanted alone) and group 3 (nothing implanted). They were killed at four, eight and 12 weeks for visual, radiological and histological study. The bone defects had complete union for group 1 and partial union in group 2, 12 weeks after operation. There was no formation of new bone in group 3. We conclude that SF/HA-3 combined with BMSCs supports bone healing and offers potential as a bone-graft substitute.
Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou, China.
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Wang
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Yang
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Li
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Lu
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Chen
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Cai
D000818:Animals; D001672:Biocompatible Materials; D001854:Bone Marrow Cells / Q000502:physiology; D001861:Bone Regeneration / Q000187:drug effects* / Q000502:physiology; D018786:Bone Substitutes / Q000494:pharmacology*; D018920:Coculture Techniques; D017886:Durapatite / Q000494:pharmacology*; D005349:Fibroins / Q000494:pharmacology*; D011817:Rabbits; D051381:Rats; D017207:Rats, Sprague-Dawley; D017154:Stromal Cells / Q000502:physiology*; D046509:Tissue Culture Techniques; D023822:Tissue Engineering / Q000379:methods; D054457:Tissue Scaffolds; D014945:Wound Healing / Q000187:drug effects
D001672:Biocompatible Materials; D018786:Bone Substitutes; C482288:fibroin, silkworm; D005349:Fibroins; D017886:Durapatite