| 20200934 |
Ma L, Zheng LW, Sham MH, Cheung LK: Uncoupled angiogenesis and osteogenesis in nicotine compromised bone healing. J Bone Miner Res. 2010 Jan 14.
Nicotine is the main chemical component responsible for tobacco addiction. This study aimed to evaluate the influence of nicotine on angiogenesis and osteogenesis and the associated expression of angiogenic and osteogenic mediators during bone healing. Forty eight adult New Zealand white rabbits were randomly assigned to a nicotine group and a control group. Nicotine pellets (1.5g, 60-day time release) or placebo pellets were implanted in the neck subcutaneous tissue. The nicotine or placebo exposure time for all the animals was seven weeks. Unilateral mandibular distraction osteogenesis was performed. Eight animals in each group were sacrificed on day 5, day 11 of active distraction and week 1 of consolidation respectively. The mandibular samples were subjected to radiographic, histological, immunohistochemical and real time reverse transcription polymerase chain reaction examinations. Nicotine exposure upregulated the expression of hypoxia inducible factor 1alpha and vascular endothelial growth factor and enhanced angiogenesis, but inhibited the expression of bone morphogenetic protein-2 and impaired bone healing. The results indicated that nicotine decouples angiogenesis and osteogenesis in this rabbit model of distraction osteogenesis, and the enhanced angiogenesis can not compensate for the adverse effects of nicotine on bone healing. (c) 2010 American Society for Bone and Mineral Research. |
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