肝素壳聚糖涂层促进脱细胞骨基质材料修复兔阶段性骨缺损血液灌注及血管化的实验研究Experimental study on hemoperfusion and vascularision of heparin chotisan coated acellular bone matrix in repairing of rabbit segmental bone defcet
滕云;余绍芬;张波;王正国;孙新君;
摘要(Abstract):
[目的]观察复合肝素壳聚糖脱细胞骨基质材料植入骨缺损早期血液供应的变化及血管化的情况。[方法]利用层层自组装方法将带有不同电荷的肝素、壳聚糖聚电解质组装到脱细胞骨基质材料上,通过超微结构及XPS等观察特性并在体外测定抗凝活性。取健康新西兰大白兔30只随机分成6组(1、3、7、14、21、28 d),制作桡骨中段骨缺损模型。一侧植入复合材料,另一侧植入单纯ACBM作为自身对照。在上述时间点行CT灌注成像、组织学等观察。[结果]时间密度曲线显示复合材料呈Ⅱ型,而对照侧呈平滑的Ⅳ型渗透模式;术后1 d开始复合材料侧血容量(blood volume BV)、血流量(blood flow BF)显著高于对照侧;术后1~3 d组织学观察见复合材料中有大量红细胞和有核细胞,而对照侧以液体为主,偶见细胞;3~7 d在复合材料网孔中有血管形成,对照侧在血管材料外周出现且数量显著少于复合材料侧(P<0.05)。[结论]材料表面改性后体内、外均有可控缓释的抗凝效果,桡骨骨缺损植入小体积复合材料后血液呈现灌注模式并加快材料的早期血管化。
关键词(KeyWords): 组织工程骨;血管化;骨缺损;肝素;CT灌注成像
基金项目(Foundation): 全军十一五基金资助(编号:06MA096)
作者(Author): 滕云;余绍芬;张波;王正国;孙新君;
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DOI:
参考文献(References):
- [1]Griffith LG,Naughton G.Tissue engineering-current challengesand expanding opportunities[J].Science,2002,295:1009-1014.
- [2]Khetani SR,Bhatia SN.Engineering tissues for in vitro applications[J].Curr Opin Biotechnol,2006,17:524-531.
- [3]Rouwkema J,Rivron NC,Blitterswijk CA.Vascularization in tissueengineering[J].Trends Biotechnol,2008,26:434-441.
- [4]MacNeil S.Progress and opportunities for tissue-engineered skin[J].Nature,2007,445:874-880.
- [5]Clar C,Cummins E,McIntyre L,et al.Clinical and cost-effective-ness of autologous chondrocyte implantation for cartilage defects inknee joints:systematic review and economic evaluation[J].HealthTech Assess,2005,9:71-82.
- [6]McFadden EP,Stabile E,Regar E,et al.Late thrombosis indrug-eluting coronary stents after discontinuation of antiplatelet therapy[J].Lancet,2004,364:1519-1521.
- [7]Jain RK,Au P,Tam J,et al.Engineering vascularized tissue[J].Nat Biotechnol,2005,23:821-829.
- [8]Boddoh S,Almodovar J,Zhang H,et al.Layer-by-layer assemblyof polysaccharide-based nanostructured surfaces containing poly-electrolyte complex nanoparticles,colloids and surfaces[J].Biointerfaces,2010,77:60-68.
- [9]Qiang C,Zailiang Y,Shijin S,et al.Adipose-derived stem cellsmodified genetically in vivo promote reconstruction of bone defects[J].Cytotherapy,2010,6:831-840.
- [10]孙新君,王正国,朱佩芳,等.脱细胞骨基质材料的特性及生物安全性观察[J].中华创伤杂志,2005,11:833-837.
- [11]孙新君,张世昌,杨再亮,等.CT灌注成像在组织工程骨材料修复缺损早期血液灌注及血管化检测的应用[J].中国矫形外科杂志,2011,8:662-666.