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Performance of PEGylated chitosan and poly (L-lactic acid-co-ε-caprolactone) bilayer vascular grafts in a canine femoral artery model.
Colloids and Surfaces B: Biointerfaces ( IF 5.4 ) Pub Date : 2020-01-17 , DOI: 10.1016/j.colsurfb.2020.110806
Anlin Yin 1 , Weihua Zhuang 2 , Gongyan Liu 3 , Xiaorong Lan 2 , Zhonglan Tang 2 , Yan Deng 4 , Yunbing Wang 2
Affiliation  

The fabrication of a functional small-diameter vascular graft with good biocompatibility, in particular hemocompatibility, has become an urgent clinical necessity. We fabricated a native bilayer, small-diameter vascular graft using PEGylated chitosan (PEG-CS) and poly (L-lactic acid-co-ε-caprolactone; PLCL). To stabilize the inner layer, a PEG-CS blend with PLCL at ratio of 1:6 was casted on a round metal bar by a drip feed, and the outer layer, a PLCL blend with water-soluble PEG that acted as a sacrificial part to enhance pore size, was fabricated by electrospinning. The results showed excellent hemocompatibility and strong mechanical properties. In vitro, the degradation of the graft was evaluated by measuring the graft structure, mass loss rate, and changes in molecular weight. The results indicated that the graft had adequate support for the regeneration of blood vessels before collapse. An in vivo study was performed in a canine femoral artery model for up to 24 weeks, which demonstrated that the PEGylated bilayer grafts possessed excellent structural integrity, high compatibility with blood, good endothelial cell (EC) and smooth muscle cell (SMC) growth, and high expression levels of angiogenesis-related proteins, features that are highly similar to autologous blood vessels. Moreover, the results showed almost negligible calcification within 24 weeks. These findings confirm that the bilayer graft mimics native cells, thereby effectively improving vascular remodeling.

中文翻译:

PEG化壳聚糖和聚(L-乳酸-co-ε-己内酯)双层血管移植物在犬股动脉模型中的性能。

具有良好的生物相容性,特别是血液相容性的功能性小直径血管移植物的制造已成为临床上的迫切需要。我们使用聚乙二醇化壳聚糖(PEG-CS)和聚(L-乳酸-co-ε-己内酯; PLCL)制造了天然的双层小直径血管移植物。为了稳定内层,通过滴加料将比例为1:6的PLCL的PEG-CS共混物通过滴加料浇铸到圆形金属棒上,并将外层作为牺牲部分的水溶性PEG-CSL的共混物​​浇铸在圆形金属棒上为了增加孔径,是通过静电纺丝制造的。结果显示出极好的血液相容性和强的机械性能。在体外,通过测量移植物的结构,质量损失率和分子量的变化来评估移植物的降解。结果表明,移植物对塌陷前的血管再生具有足够的支持。在犬股动脉模型中进行了长达24周的体内研究,结果表明PEG化双层移植物具有出色的结构完整性,与血液的高度相容性,良好的内皮细胞(EC)和平滑肌细胞(SMC)生长,和血管生成相关蛋白的高表达水平,其特征与自体血管高度相似。此外,结果显示24周内钙化几乎可以忽略不计。这些发现证实双层移植物模仿天然细胞,从而有效地改善了血管重塑。这表明聚乙二醇化的双层移植物具有出色的结构完整性,与血液的高度相容性,良好的内皮细胞(EC)和平滑肌细胞(SMC)的生长以及血管生成相关蛋白的高表达水平,这些特征与自体血液高度相似船只。此外,结果显示24周内钙化几乎可以忽略不计。这些发现证实双层移植物模仿天然细胞,从而有效地改善了血管重塑。这表明聚乙二醇化的双层移植物具有出色的结构完整性,与血液的高度相容性,良好的内皮细胞(EC)和平滑肌细胞(SMC)的生长以及血管生成相关蛋白的高表达水平,这些特征与自体血液高度相似船只。此外,结果显示24周内钙化几乎可以忽略不计。这些发现证实双层移植物模仿天然细胞,从而有效地改善了血管重塑。结果显示24周内钙化几乎可以忽略不计。这些发现证实双层移植物模仿天然细胞,从而有效地改善了血管重塑。结果显示24周内钙化几乎可以忽略不计。这些发现证实双层移植物模仿天然细胞,从而有效地改善了血管重塑。
更新日期:2020-01-17
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