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脑室内注射瘦素对四肢骨折愈合的影响

刘保龙,孙志明,武俏丽,王宏   

  1. 天津市环湖医院
  • 收稿日期:2014-04-02 修回日期:2014-04-08 出版日期:2014-06-15 发布日期:2014-06-15
  • 通讯作者: 刘保龙

The enhanced osteogenesis on bone fracture healing of intracerebroventricular leptin Injected through Foramen magnum

  • Received:2014-04-02 Revised:2014-04-08 Published:2014-06-15 Online:2014-06-15
  • Contact: Bao-Long LIU

摘要: 【摘要】目的:建立兔胫腓骨骨缺损模型,经枕骨大孔向兔脑室内(小脑延髓池)注射瘦素蛋白(leptin)后观察其对骨折愈合速度的影响。方法:建立新西兰兔右侧胫腓骨外侧骨缺损模型,实验组(leptin组)经兔枕骨大孔向小脑延髓池脑脊液中注射重组兔瘦素蛋白,对照组以相同方法注射等剂量生理盐水。于第1,3,7,14,21天记录兔体重变化曲线,并通过CT动态记录骨缺损区域骨痂骨密度(Bone Mineral Density)的变化来评估骨折愈合情况。于第3周,所有动物均处死后取右侧胫腓骨骨缺损区域,以原位杂交(Fluorescence in situ hybridization, FISH)来检测骨折区域骨成型蛋白2(BMP-2)的表达情况。结果:经枕骨大孔向小脑延髓池注射leptin后,骨缺损愈合过程中兔出现较为明显的体重下降,缺损区域骨痂密度显著高于对照组,第3周原位杂交结果提示BMP-2表达高于对照组,差异均有统计学意义(P<0.001)。结论:在兔右侧胫腓骨骨缺损模型中,经枕骨大孔向小脑延髓池内中注射leptin可加速四肢骨缺损的愈合。

关键词: 中枢瘦素, 四肢骨折, 骨折愈合, 骨成型蛋白2

Abstract: 【Abstract】Objective: To investigate the enhanced osteogenesis on bone fracture healing at a segmental bone defect of injecting leptin into intracerebroventricular (ICV) through Foramen magnum. Method: Segmental critical-sized defects were created at the right tibial bone of skeletally mature New Zealand white rabbits. Recombinant rabbit leptin (leptin group) and normal saline (control group) were injected into cerebellomedullary cistern through foramen magnum. Bone fracture healing was evaluated through callus formation and bone mineral density (BMD) by using qCT at 1st, 3rd, 7th days and the 2nd ,3rd week. At the 3rd week, all rabbits were euthanized to collect the right tibia for histomorphology. Result: The result showed that ICV leptin exhibited significantly high osteoinduction activity compared with that of NS group: qCT showed leptin group healed faster than control group, formulation of callus appeared early than that of control group, and the BMD analysis results showed that the BMD of tibias in LEP group were significantly different with NS group. Conclusion: ICV leptin could accelerate bone fracture healing at the bone defection model

Key words: ICV leptin, limbs fracture, bone fracture healing, Bone Morphogenetic Protein 2