3-羟基丁酸与3-羟基己酸共聚酯在心血管组织工程中的应用

为了研究可降解聚合材料3-羟基丁酸与3-羟基己酸共聚酯 (3-hydroxybutyrate-co-3-hydroxyhexanoate, PHBHHx)的血管内生物相容性, 采用脱细胞羊肺动脉为支架, 以PHBHHx涂层, 构建复合补片(Hybrid patch), 植入New Zealand兔腹主动脉内(12只), 以脱细胞未涂层羊肺动脉片(Uncoated patch)做为对照(12只)。分别于术后第1、4和12周处死动物, 取出移植补片进行组织学、免疫荧光染色、扫描电镜和钙含量测定。结果表明: hybrid patch管腔面光滑无血栓, 内膜增生适度, 再细胞化完全; 免疫荧光染色检测, 新生内膜组织中类内皮细胞呈CD31阳性反应, 单层连续排列, 间质细胞呈现SMA阳性反应; 钙含量测定, hybrid patch明显低于uncoated patch(P<0.05)。由此认为: PHBHHx的血管内生物相容性满意, 是心血管组织工程较为理想的腔内涂层材料。

Intravascular Biocompatibility of Decellularized Xenogenic Vascular Scaffolds/PHBHHx Hybrid Material for Cardiovascular Tissue Engineering

Poly (3-hydroxybutyrate-co-3-hydroxyhexanoate, PHBHHx) has superior mechanical and biocompatibility that may enable it to meet cardiovascular tissue engineering applications. We developed hybrid materials based on decellularized xenogenic vascular scaffolds that were coated with PHBHHx to investigate the intravascular biocompatibility. The hybrid patches were implanted in the rabbit abdominal aorta (hybrid patch, n=12). Only decellularized xenogenic vascular scaffolds were implanted without coating as control (uncoated patch, n=12). The patches were explanted and examined histologically, and biochemically at 1, 4 and 12 weeks after the surgery. The hybrid patches maintained original shapes, covered by confluent layer of cells and had less calcification than uncoated control. The results indicated that PHBHHx coating reduced calcification, promoted the repopulation of hybrid patch with recipients cells. In conclusion, PHBHHx showed remarkable intravascular biocompatibility and would benefit endothelization which would be a useful candidate for lumen of cardiovascular tissue engineering.