RGD及EC防钙化处理后介入心脏瓣膜表面的生物学特性

摘要

Objective Anti-calcification and surface modification of the transcatheter heart valve is the priority research area and development direction of bioprosthesis heart valve.In present study,the Arginine-Glycine-Aspartic acid(RGD) coating technology and anti-calcification with epoxy chloropropane(EC) treatment were applied to investigate surface modification property of the transcatheter heart valve compared to the traditional anti-calcification method with glutaraldehyde (GA) treatment to demonstrate the improvement of structure and surface biological properties of the transcatheter heart valve.Methods Morphological characteristics of mesenchymal stem cells(MSCs) seeded on the transcatheter heart valve with the various anticalcification treatments were observed by scanning electron microscopy and the apoptosis rates of MSCs seeded on the transcatheter heart valve with the various anti-calcification interventions were studied by TUNEL staining.The cell adhesion and expression of the cytoskeletal protein,Vinment of MSCs treated as described were analyzed by cell-counting method and fluorescence immunohistochemical method respectively.Results The apoptosis rate of MSCs was markedly decreased while the expression of vinment and the cell adhesion strength of MSCs were elevated in the groups of GA-EC and RGD-EC treatments.The biological indices of RGD-EC group has significant difference(P ＜ 0.05) compared with GA group.Conclusion Biological properties of the surface of transcatheter heart valve can be remarkably improved by GA-EC and RGD-EC anti-calcification treatments.%目的 应用自主研发的精氨酸-甘氨酸-天冬氨酸肽(RGD)涂层技术以及环氧氯丙烷(EC)防钙化处理技术于介入瓣膜材料表面改性,探讨其对介入瓣膜组织结构及表面生物学特性的改进.方法 将骨髓间质干细胞(MSCs)种植于不同防钙化处理的心脏瓣膜上,分别采用扫描电镜技术、TUNEL染色法、细胞计数法及荧光免疫组织化学法观察其形态学特点、凋亡率、细胞黏附性能及MSCs的细胞骨架蛋白Vinment的表达.结果 心脏瓣膜GA-EC、RGD-EC表面改性处理后,MSCs形态发生变化;MSCs凋亡率减少显著;MSCs细胞黏附性增高;MSCs的细胞骨架蛋白Vinment表达增高,与传统防钙化处理GA组相比较,RGD-EC组各项检测指标差异均有统计学意义(P＜0.05).结论 GA-EC、RGD-EC防钙化介入心脏瓣膜可有效地改善心脏瓣膜组织表面生物学特性.