Escherichia coli-derived recombinant human bone morphogenetic protein-2 combined with bone marrow-derived mesenchymal stromal cells improves bone regeneration in canine segmental ulnar defects.

BACKGROUND

large bone defects in canines usually require assistance to achieve healing. Implantation of osteoinductive factors may promote bone healing, while osteoprogenitor cell transplantation may improve bone regeneration.

 We hypothesize that the implantation of osteoinductive factor, recombinant human bone morphogenetic protein-2 (rhBMP-2), combined with osteoprogenitor cells, derived mesenchymal stromal bone marrow cells (BMSCs), will synergistically to promote bone healing. In this study, we examined the combined Rabbit Recombinant Proteins effects of Escherichia coli-derived rhBMP-2 and BMSCs in bone healing after implantation into dogs ulnar defect.

RESULTS

osteoperiosteal critical sized segmental defect (2.5 cm) were created in the ulna of healthy female beagle dogs, and implanted with a combination of E. coli-derived rhBMP-2 (560 or 140 mg) and BMSCs autologous (10 (7), 10 (5 ), or 0 cells). In this study, 18 forelimbs nine healthy female beagle dogs bred purpose use. All six treatment groups containing three front arms, and the animals were euthanized after 12 weeks.

 The control group (560 and 140 mg / 0 cells) were taken from our previous studies to reduce the number of animal experiments. Radiography, bone regeneration width increased significantly in 560 or 140 mg with 10 (7) and 10 (5) cells group compared with 0 of cell groups. With CT quantitative, bone mineral density was higher in the 560 ug with 10 (7) and 10 (5) groups of cells, whereas the non-uniformity of bone mineral density increased in the 560 ug with 10 (7) and 10 (5) of cell groups and 140 mg / 10 (group 7) cells. 

Mechanically, the maximum load to failure was significantly higher in the 560 ug with 10 (7) and 10 (5) of cell groups. Histologically, bone regeneration was developed and contain osteocyte-like cells of the marrow cavities, and ships. However, osteoclasts and osteoblasts hardly observed. Number osteocyte-like cells was significantly higher in the 560 ug with 10 (7) and 10 (5) and 140 ug cell with 10 (7) and 10 (5) of cell groups.

CONCLUSION

Implantation of E. coli-derived rhBMP-2 and BMSCs cause significantly enhanced bone formation, with an increase in bone mineral density Rat Recombinant Proteins

 and reduce the non-uniformity of bone regeneration. The combined implantation of rhBMP-2 and BMSCs may be useful for the promotion of bone healing in critical-sized defects in canines.