枝状化聚乙二醇修饰的去细胞猪主动脉瓣膜内皮化的性能研究  

The endothelialization properties of decellularized porcine aortic valve modified with branched polyethylene glycol

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作  者:周建良[1] 聂彬恩[2,3] 朱志刚[1] 丁静丽[4] 胡时栋[1] 陈佳[1] 

机构地区:[1]南昌大学第二附属医院心胸外科,330006 [2]上海交通大学医学院 [3]上海市骨科内植物重点实验室上海市第九人民医院骨科 [4]南昌大学第二附属医院消化内科,330006

出  处:《中华实验外科杂志》2015年第8期1844-1847,共4页Chinese Journal of Experimental Surgery

基  金:863计划青年科学家专题项日(2014AA020539);圈家自然科学基金资助项目(81260047);江西省一年科学基金资助项同(20122BAB215016)

摘  要:目的观察枝状化聚乙二醇(PEG)修饰后的去细胞猪主动脉瓣(DPAV)的内皮细胞生长性能。方法自合成枝状化聚乙二醇(4-arm—PEG—acrylate),采用核磁共振氢谱(1HNMR),对复合物进行表征检测,利用4-arm。PEG.amylate上的丙烯酸酯与巯基化的DPAV结合对其进行PEG化,体外获取人脐静脉内皮细胞,以细胞密度为1X10。接种于各组瓣膜支架材料上,8d后MTS试剂、苏木素-伊红(HE)染色、扫描电镜(SEM)评价内皮细胞的生长。结果。HNMR(D2O):3.51~3.86ppm处PEG信号峰,4.14(4H,CH,OAr),5.80~6.48ppm处丙烯酸酯双键。SEM可见枝状化㈨(;修饰的DPAV胶原纤维交联增粗,人脐静脉内皮细胞在DPAV上种植8天DPAV组细胞数为(0.88±0.03)×105/cm,PEG—DPAV组细胞数为(1.18±0.04)×105/cm2,PEG—DPAV组高于DPAV组(P〈0.05)。HE染色和SEM可见两组瓣膜支架表面仅有散在的细胞存在,呈梭形或不规则形,细胞数PEG—DPAV高于DPAV组,部分可见细胞问连接紧密形成一层近似融合的细胞层,但细胞紧惭连接不连续。结论枝状化PEG修饰的去细胞猪主动脉瓣膜能够提高内皮细胞的黏附增殖,但卸不能在去细胞瓣膜支架表面形成一层完整的融合层,因此PEG化的瓣膜并不能达到理想的内皮化,有必要进行进一步修饰。Objective To investigate the endothelialization performance of decellularized porcine aortic valve (DPAV) modified with branched polyethylene glycol. Methods Synthesis of 4 -arm- Poly- etbyl glycol (PEG) - acrylate, characterized by 1H nuclear magnetic resonance (NMR) , then react with OPAV which had been introduced thiol through N - Suceinimidyl - S - aeetylthioacetate ( SATA ), human umbilical vein endothelial cells (HUVECs)were harvested in vitro and the cell were seeded in each group with density of 1 × 105 , CellTiter 96 AQueous One Solution Cell Proliferation Assay ,Hematoxylin and co- sin (HE) stain and scanning electron microscopy (SEM) were performed for each group to detect the HU- VECs growth 8 d after the seeding. Results 1HNMR (D20) : 3.51 - 3.86 ppm belong to PEG peak, 4. 14 (4H, CH2OAr) , 5.80 - 6. 48 ppm belong to acrylate bond. SEM shows that DPAV modified with branched PEG become thickening, aftr HUVECs had grown for eight days, cell numbers in DPAV group was(0. 88 ±0. 03) × 105/cm2, while PEG - DPAV group was( 1. 18 ±0. 04) ×105/ cm2. the cell numbers were higher in group PEG - DPAV as compared to those in group DPAV ( P 〈 0. 05 ). HE and SEM obser- vations indicated that A confluent monolayer of endothelial cells was present on the valve surface in group PEG -DPAV at 8th d after the seeding, but not complete. Conclusion DPAV modified with branched PEG can improve the growth of endothelial cells, but cannot forming a complete fusion layer in the surface of decellularized valve scaffolds, so the PEGyalated DPAV can not achieve the desired endothelialization, and should be further modified.

关 键 词:组织工程心脏瓣膜 去细胞猪主动脉瓣膜 聚乙二醇 共价修饰 内皮化 

分 类 号:R654.2[医药卫生—外科学]

 

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