The effects of hypoxia-inducible factor (HIF)-1 alpha protein on bone regeneration during distraction osteogenesis: an animal study

摘要

The aim of this study was to observe the effect of hypoxia-inducible factor (HIF)-1 alpha on bone regeneration during distraction osteogenesis (DO). Fifty-one New Zealand white rabbits underwent mandibular lengthening with a distraction rate of 2 mm/day, and were divided randomly into three groups (17 in each). Group C rabbits received 20 mu g rHIF-1 alpha, group B received 10 mu g rHIF-1 alpha, and group A received 100 mu 1 saline injection in the distraction gap every day for 10 days. Radionuclide bone imaging (RBI), computed tomography, dual energy X-ray absorptiometry, radiography, histology, and three-point bend testing were performed. RBI showed that the uptake ratio in group B (1.41 +/- 0.25, P = 0.013) and group C (1.64 +/- 0.37, P < 0.001) was higher than that in group A (1.01 +/- 0.26). The bone mineralization density and bone mineralization content in group C were highest among the three groups. Radiology and histology findings indicated more callus regeneration in groups C and B. Mechanical testing demonstrated that the ultimate force in group C (289.71 +/- 43.31 N, n = 6) was 1.49-fold (P < 0.001) that of group A and 1.20-fold (P = 0.012) that of group B. HIF-1 alpha may represent a new agent to promote DO by accelerating osteogenesis and mineralization.