南方医科大学学报

南方医科大学学报 ›› 2016, Vol. 36 ›› Issue (03): 345-.

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磷酸三钙复合骨形态发生蛋白-2/血小板衍生生长因子-BB修复SD大鼠颅骨标准骨缺损

何瑞轩，肖建斌，宋兵，黄志会，赵亮   

  • 出版日期:2016-03-20 发布日期:2016-03-20

Tricaicium phosphate complex pre-loaded with bone morphogenetic protein-2 or platelet derived growth factor-BB for repairing critical-size cranial defects in SD rats

  • Online:2016-03-20 Published:2016-03-20

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摘要： 目的观察新型生物功能化复合材料在SD大鼠颅骨标准骨缺损中再生修复作用，为骨生物材料的基础研究、成骨及成 血管提供实验资料。方法3 月龄雄性SD 大鼠颅骨标准缺损模型随机分入不同实验组，观察时间6 周。实验分为 CaPfromGEM21、CaPfromGEM21 + 10 ng 复合了骨形态发生蛋白-2（BMP-2）、CaPfromGEM21 + 100 ng BMP-2、 CaPfromGEM21+0.3 μg 血小板衍生生长因子（PDGF）-BB、CaPfromGEM21+3 μg PDGF-BB 和空白组。对标本行X 线、 Micro CT，苏木素-伊红染色（HE染色）及相关的定量分析。结果X线影像提示各组骨缺损均有不同程度的修复，骨折线逐 渐模糊，PDGF-BB组的骨缺损基本修复。Micro CT可见各组骨缺损均有不同程度新生骨长入。新生骨体积定量结果提示 添加PDGF-BB组新生骨明显多于BMP-2 实验组（P<0.05），具有统计学意义。HE染色切片各组均未见急慢性炎症细胞浸 润，缺损中可见染色均一的新生骨组织，新生骨内及周围可见散在的新生血管，新生骨面积百分数提示10 ng BMP-2 组新生 骨面积百分数及0.3 μg PDGF-BB组新生骨量百分数均明显大于单纯材料组（P<0.05），新生血管密度定量提示4 个添加因子 的实验组的新生血管密度均明显大于空白组及单纯材料组（P<0.05），4 个添加因子的实验组之间差异无统计学意义（P> 0.05）。结论CaPfromGEM21 复合BMP-2/PDGF-BB具有良好的生物相容性，骨缺损修复效果优于单纯材料植入，有望成为 理想的新型骨再生修复替代材料之一。

Abstract: Objective To observe the effect of a new biomaterial in promoting the bone regeneration for repairing critical-size cranial defects in SD rats. Methods Critical-size cranial defects were induced in 3-month-old male Sprague-Dawley rats and repaired with the implants of calcium phosphate from growth factor enhanced matrix 21 (CaPfromGEM21, control), CaPfromGEM21 preloaded with 10 ng bone morphogenetic protein-2 (BMP-2), CaPfromGEM21 preloaded with 100 ng BMP-2, CaPfromGEM21 preloaded with 0.3 μg platelet-derived growth factor-BB (PDGF-BB), or CaPfromGEM21 preloaded with 3 μg PDGF-BB. The defects were examined 6 weeks after the surgery with X-ray, micro-CT, HE staining and quantitative assessments. Results X-ray showed defect repair in all the groups. The fracture line became obscure, and the defects were almost fully repaired by the regenerated bone tissues in PDGF-BB group. Micro-CT demonstarted new bone formation in the defects. The new bone volume was significantly greater in PDGF-BB groups than in BMP-2 groups (P<0.05). HE staining revealed the presence of new bones in the defects and new vessels in and around the new bones without inflammatory cells. The new bone area fraction was significantly greater in 10 ng BMP-2 group and 0.3 μg PDGF-BB group than in the control group (P<0.05), and the new vessel density was similar in the all the 4 cytokine-preloaded groups and all significantly greater than that in the blank and CaPfromGEM21 control group (P<0.05). Conclusion CaPfromGem21 combined with BMP-2 or PDGF-BB has good biocompatibility and can better promote bone regeneration for repairing bone defects.