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find Author "赵东锷" 4 results
  • 组织工程心脏瓣膜构建现状与发展

    摘要 为了克服目前临床应用的人工心脏瓣膜在抗凝和衰坏方面的缺点,随着组织工程学的发展,构建组织工程心脏瓣膜的研究已取得初步进展。综述近年来组织工程心脏瓣膜在种植材料、种子细胞、动物实验和基础研究方面取得的进展,并探讨组织工程心脏瓣膜的优越性和可行性。

    Release date:2016-08-30 06:33 Export PDF Favorites Scan
  • In vitro experience in tissue engineering heart valve with poly-hydroxybutyrate-co-hydroxyvalerate

    Objective To evaluate the feasibility to fabricate tissue engineered heart valve leaflet with poly hydroxybutyrate co hydroxyvalerate (PHBV) scaffold. Methods Constructive characteristics of PHBV were observed by scanning electron microscope. PHBV was implanted subcutaneously in rabbit and extirpated at 2,4,6,8, and 10 weeks in order to study its biocompatibility and biodegradability. Cell growth curve, smooth muscle α actin and ultra microscopic characteristics were observed in canine aortic valve interstitial cells. The cells were seeded on the PHBV and their function of prostaglandin I 2 (PGI 2) synthesis was determined. Results Porous diameter of PHBV was 130μm, PHBV had good biocompatibility and completely degraded at the end of the 10th week. Smooth muscle α actin were expressed in canine aortic valve interstitial cells and grew well. Cells implanted on PHBV grew well, PGI 2 were synthesized and secreted( P lt;0.05). Conclusion It is feasible to fabricate a tissue engineering heart valve leaflet in vitro with PHBV scaffold.

    Release date:2016-08-30 06:27 Export PDF Favorites Scan
  • 应用猪主动脉去细胞瓣膜支架体外构建组织工程心脏瓣膜

    目的 探讨应用猪去细胞瓣膜支架体外构建组织工程心脏瓣膜的可行性. 方法 采用去垢剂、渗透压改变和核酸酶消化的方法制备猪主动脉瓣去细胞瓣膜支架(实验组),用去内皮细胞主动脉瓣作对照(对照组),并对两组含水量、可溶性蛋白含量、热皱缩温度、力学性能和组织相容性进行测定.培养犬主动脉壁间质细胞和内皮细胞,将其种植于实验组去细胞支架上,观察细胞生长情况,并测定内皮细胞合成前列环素的功能. 结果 实验组瓣膜细胞成分完全从瓣膜中去除,与对照组新鲜瓣膜相比,含水量增高(P<0.05),可溶性蛋白含量减少(P<0.05),热皱缩温度和抗张强度无明显变化.实验组瓣膜组织相容性试验显示,材料组织相容性好,体内降解时间为10周;犬主动脉壁间质细胞和内皮细胞在瓣膜表面生长良好,内皮细胞具有合成分泌前列环素的功能. 结论 采用去垢剂、渗透压改变和核酸酶消化的方法制备猪主动脉瓣去细胞瓣膜支架,在去除细胞和可溶性蛋白质的同时保持了瓣叶的基本结构和力学性能;以其为支架体外构建组织工程心脏瓣膜的细胞不仅能在材料表面生长,还能合成、分泌血管活性物质,是具有生理功能的组织工程心脏瓣膜.

    Release date:2016-08-30 06:32 Export PDF Favorites Scan
  • 应用聚乳酸聚乙醇酸膜构建组织工程心脏瓣膜的实验研究

    目的 探讨应用聚乳酸聚乙醇酸(PLGA)构建组织工程心脏瓣膜的可行性. 方法 扫描电子显微镜观察PLGA结构特点,将PLGA在兔皮下包埋,分别于2周、4周、6周、8周和12周观察材料的生物相容性和降解率,培养犬主动脉瓣间质细胞、主动脉壁间质细胞和皮肤成纤维细胞,对照其生长曲线、平滑肌α肌动蛋白表达和扫描电子显微镜特点.将犬主动脉壁间质细胞和内皮细胞种植于PLGA上,观察其形态并测定细胞合成胶原和前列环素的功能. 结果 PLGA呈网孔状结构,孔径179μm.皮下包埋显示PLGA生物相容性好,体内降解时间为12周.犬主动脉瓣间质细胞和主动脉壁间质细胞平滑肌α肌动蛋白均为部分阳性表达,细胞内有大量粗面内质网,生长曲线相似.细胞种植显示细胞在材料表面生长良好,并具有合成胶原和前列环素的功能(P<0.05 ). 结论 以PLGA为支架体外构建组织工程心脏瓣膜细胞不仅能在PLGA表面生长,还能合成细胞间质和血管活性物质,初步提示应用本组材料和方法构建组织工程心脏瓣膜是可行的.

    Release date:2016-08-30 06:34 Export PDF Favorites Scan
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