RhBMP-2诱导犬气管移植体软骨再生的实验研究

目的 探讨重组人骨形态发生蛋白-2（rhBMP-2）植入犬气管移植体内诱导软骨再生效果。方法 12只犬随机等分两组，分别将rhBMP-2／胶原（collagen）或胶原植入犬气管移植段，进行自体移植，通过HE染色、Masson’s染色、免疫组化检测软骨再生。18只犬随机等分为6组，给予不同浓度的rhBMP-2，利用HPIAS-1000高清晰度彩色病理图像分析仪测定各组新生软骨的面积，确定最佳诱导浓度。12只犬随机等分成2组，分别进行自体、异体移植并植入rhBMP-2，测定各组移植段气管管腔及新生软骨面积。结果 rhBMP-2／胶原植入气管移植段后，可以在植入区及固有软骨的软骨膜处诱导软骨再生，新生软骨面积与对照组差异有统计学意义（P〈0．01）。rhBMP-2剂量与新生软骨面积呈剂量依赖关系，当rhBMP-2浓度为5mg/ml时，其诱导的新生软骨面积最多。在自体移植与异体移植实验中，植入rhBMP-2后，移植段气管管腔的狭窄情况均较对照组得到改善。结论 rhBMP-2可促进气管移植体软骨再生，其诱导作用不仅可以促进植入区的软骨再生，而且通过软骨细胞间的接触促进了软骨膜处的软骨再生。可见rhBMP-2可以促进移植段气管的软骨再生，克服气管移植段的软化狭窄。

Recombinant human bone morphogenetic protein-2 stimulation of cartilage regeneration in canine tracheal graft

Objective To induce regeneration of dog's tracheal cartilage by implanting the recombinant human bone morphogenetic protein-2 (rhBMP-2) into the tracheal graft in order to prevent the trachea from collapse. Methods RhBMP-2 with the atelopeptide type-1 collagen carrier was implanted around the cartilage ring of the autograft. New cartilage formed was detected with the histological analysis and immunohistochemical stain after 4 weeks. Six different concentrations of rhBMP-2 with collagen carrier were implanted around the cartilage ring in 6 auto transplantation groups respectively. The area of new cartilage regeneration was calculated in choosing the optimal dosage of rhBMP-2. Auto and allo tracheal transplantation were performed with rhBMP-2 implanted around the cartilage ring, the diameter of the grafts, histological analysis, and the area of the new cartilage regeneration were calculated. Results The addition of rhBMP-2 resulted in significantly greater amount of the new cartilage area (P<0.01). The area of new cartilage increased with increasing the concentration of rhBMP-2. A concentration of 5 mg/ml was likely the most effective dosage. In both the auto and allo grafts, new cartilage was found within the tracheal cartilage rings and around perichondrium. There was significant increase in the diameter of the trachea indicating was cicatrical stenosis following implanting rhBMP-2. Conclusion This study demonstrated that rhBMP-2 may significantly stimulate the cartilage regeneration in the peri-implant sites and around the perichondrium. Conclusively it is suggested that rhBMP-2 can be used to stimulate cartilage growth of tracheal grafts in order to prevent the stenosis after tracheal transplantation.