骨碎补总黄酮调控H型血管影响大鼠股骨Masquelet诱导膜模型的骨重建

Bone remodeling in the Masquelet-induced membrane model of rat femur by modulation of H-type vessels by total flavonoids of rhizome drynariae

背景:多项研究发现,骨碎补总黄酮可促进诱导膜中血管新生、改善诱导膜生物性能、加速诱导膜技术骨重建,但相关分子机制仍需进一步探究。目的:观察骨碎补总黄酮通过调控H型血管对大鼠股骨Masquelet诱导膜模型骨重建的影响。方法:将36只雄性SD大鼠按体质量分层后随机分为空白组、模型组、中药组,每组12只,3组均建立4 mm右后肢股骨骨缺损模型,模型组与中药组骨缺损处充填聚甲基丙烯酸甲酯骨水泥;造模后6周,空白组骨缺损处填充大鼠自体尾骨,模型组与中药组取出诱导膜内的骨水泥后植入大鼠自体尾骨。植骨第3天开始,中药组灌胃给予骨碎补总黄酮157.5 mg/(kg·d),其余两组灌胃给予生理盐水,连续给药至植骨后8周。植骨后8周取材进行相关检测。结果与结论:①X射线片显示,空白组缺损区骨折线清晰,仅有少量骨痂形成;模型组缺损区可见不连续皮质骨,骨缺损区仍存在;中药组缺损区充满新生骨组织,骨髓腔与部分皮质骨形成,骨折线消失。②Micro-CT扫描显示,空白组缺损区新生骨量较少,模型组缺损区骨小梁数量明显增多,中药组大量新生骨组织填充于骨缺损区。③苏木精-伊红染色显示,空白组缺损区仅见少量新骨形成,成骨质量较差;模型组缺损区有较多的新骨形成,但骨组织内夹杂有部分纤维结缔组织;中药组缺损区可见大量新骨形成,成骨质量最佳。④CD31/Emcn免疫荧光双标染色显示,空白组骨缺损区新生骨组织内H型血管数量稀少、分布稀疏;相比空白组,模型组骨缺损区骨组织内含更多H型血管,血管呈相对规则的条状分布;中药组骨缺损区H型血管数量最多,并且血管分布密集。⑤结果表明,骨碎补总黄酮可通过上调H型血管表达增强成血管-成骨作用,提高大鼠股骨Masquelet诱导膜模型成骨效能、促进骨重建。

BACKGROUND:Several studies have found that the total flavonoids of rhizome drynariae can promote neovascularization in the induced membrane,improve the biological properties of the induced membrane,and accelerate bone remodeling in the induced membrane,but the related molecular mechanisms still need to be further explored.OBJECTIVE:To explore the effect of total flavonoids of rhizome drynariae on bone remodeling in rat femoral Masquelet-induced membrane model by regulating H-type blood vessels.METHODS:Thirty-six male Sprague-Dawley rats were stratified by body mass and then randomly divided into blank group,model group and traditional Chinese medicine group,with 12 rats in each group.A 4-mm femoral bone defect model was established in all the rats.Bone defects in the model group and traditional Chinese medicine group were filled with polymethylmethacrylate bone cement.At 6 weeks after modeling,the tail bone of the rats was implanted in the blank group,as well as in the other two groups after removal of bone cement.The traditional Chinese medicine group was given 157.5 mg/kg per day of total flavonoids of rhizome drynariae at 3 days after bone implantation,while the model and blank groups were given the same amount of saline by gavage until the 8th week after bone implantation.Bone graft samples were taken for relevant testing at 8 weeks after implantation.RESULTS AND CONCLUSION:X-ray films showed that in the blank group,the fracture line in the defect area was clear,and only a small amount of bone callus formed;in the model group,the bone defect area still existed,where discontinuous cortical bone was visible;in the traditional Chinese medicine group,the defect area was filled with newborn bone tissues,the bone marrow cavity and part of the cortical bone formed,and the fracture line disappeared.Micro-CT scans showed that the amount of new bone in the defect area was low in the blank group,the number of bone trabeculae in the defect area was significantly increased in the model group,and a large amount of new bone tissue was filled in the bone defect area in the traditional Chinese medicine group.Hematoxylineosin staining results showed that in the blank group,only a small amount of new bone formed in the defect area and the quality of osteogenesis was poor;in the model group,there was more new bone tissue in the defect area,but some fibrous connective tissues were interspersed within the bone tissue;and in the traditional Chinese medicine group,a large amount of new bone formed in the defect area and the quality of osteogenesis was the best.CD31/Emcn immunofluorescence double-labeling staining results showed that the number of H-type blood vessels in the newborn bone tissue in the bone defect area of the blank group was sparse and sparsely distributed;compared with the blank group,there were more H-type blood vessels in the bone tissue in the bone defect area of the model group,and the blood vessels were distributed in relatively regular strips;the number of H-type blood vessels in the bone defect area of the traditional Chinese medicine group was the highest and the blood vessels were densely distributed.To conclude,the total flavonoids of rhizoma drynariae can upregulate the expression of H-type blood vessels to enhance the angiogenic-osteogenic effect,improve the osteogenic efficiency of the rat femoral Masquelet induced membrane model,and promote bone remodeling.