A mixture of hepatic cells and chito- san/gelatin solution was deposited to construct a hepatic analog by way of layer-by-layer deposition technique using a home-made devise. The size and cell concentration of the ana...A mixture of hepatic cells and chito- san/gelatin solution was deposited to construct a hepatic analog by way of layer-by-layer deposition technique using a home-made devise. The size and cell concentration of the analogs can be controlled freely. Approximately 90% of the hepatic cells re- mained viable under 0.2 Mpa extrusion pressure. Cultured in vitro 8 weeks before animal test, hepatic cells in structure maintained their phenotype and kept proliferating, and albumin and other secretion of the cells increased. Cords and hepaton-like structures were observed after culture for 20 d. These results indicate that hepatic cells could be assembled di- rectly into a 3D viable structure and expanded to form a hepatic organoid. This accomplishment is consid- ered to be an interesting means for the fabrication of liver replacements.展开更多
Recently, more attention has been attracted by intelligent drug delivery systems (DDS), because the release of drug can be controlled via the system feedback responding to pathologic environment signals. Using natural...Recently, more attention has been attracted by intelligent drug delivery systems (DDS), because the release of drug can be controlled via the system feedback responding to pathologic environment signals. Using natural polymers such as chitosan to compose this kind of pulsed DDS will be of benefit, because chitosan [.α(1→4)2-amino-2-deoxy-β-Dglucan] is one of the abundantly available polysaccharides in nature. As we know, chitosan is usually obtained by alkaline deacetylation of chitin, the principal component of shells展开更多
目的:体外构建组织工程软骨,筛选更为适合组织工程软骨构建的支架材料。方法:体外获取SD大鼠肋软骨细胞。采用第一代软骨细胞作为种子细胞,接种于壳聚糖/明胶和BMG/生物蛋白胶支架,体外培养的不同时间对其进行HE、甲苯胺蓝染色、Mas s o...目的:体外构建组织工程软骨,筛选更为适合组织工程软骨构建的支架材料。方法:体外获取SD大鼠肋软骨细胞。采用第一代软骨细胞作为种子细胞,接种于壳聚糖/明胶和BMG/生物蛋白胶支架,体外培养的不同时间对其进行HE、甲苯胺蓝染色、Mas s on染色、免疫学检测、扫描电镜观察。结果:在培养2周时,BMG/生物蛋白胶各种染色结果显示软骨细胞在其表面以及内部分布均匀,蛋白多糖和Ⅱ型胶原染色阳性;壳聚糖/明胶表面细胞稍多于前者,但内部细胞数量极少且分布不均,染色结果不如前者明显。随着培养时间的延长各种检测均显示有大量的软骨细胞特异性的蛋白多糖和Ⅱ型胶原的表达,壳聚糖/明胶凸显出明显的优势。结论:体外成功构建组织工程软骨,软骨细胞在BMG/生物蛋白胶上的生长、增殖和分泌基质情况优于壳聚糖/明胶支架。展开更多
基金supported by the National Natural Science Foundations of China(Grants Nos.30440043&30400099).
文摘A mixture of hepatic cells and chito- san/gelatin solution was deposited to construct a hepatic analog by way of layer-by-layer deposition technique using a home-made devise. The size and cell concentration of the analogs can be controlled freely. Approximately 90% of the hepatic cells re- mained viable under 0.2 Mpa extrusion pressure. Cultured in vitro 8 weeks before animal test, hepatic cells in structure maintained their phenotype and kept proliferating, and albumin and other secretion of the cells increased. Cords and hepaton-like structures were observed after culture for 20 d. These results indicate that hepatic cells could be assembled di- rectly into a 3D viable structure and expanded to form a hepatic organoid. This accomplishment is consid- ered to be an interesting means for the fabrication of liver replacements.
基金Project supported by the National Natural Science Foundation of China.
文摘Recently, more attention has been attracted by intelligent drug delivery systems (DDS), because the release of drug can be controlled via the system feedback responding to pathologic environment signals. Using natural polymers such as chitosan to compose this kind of pulsed DDS will be of benefit, because chitosan [.α(1→4)2-amino-2-deoxy-β-Dglucan] is one of the abundantly available polysaccharides in nature. As we know, chitosan is usually obtained by alkaline deacetylation of chitin, the principal component of shells
文摘目的:体外构建组织工程软骨,筛选更为适合组织工程软骨构建的支架材料。方法:体外获取SD大鼠肋软骨细胞。采用第一代软骨细胞作为种子细胞,接种于壳聚糖/明胶和BMG/生物蛋白胶支架,体外培养的不同时间对其进行HE、甲苯胺蓝染色、Mas s on染色、免疫学检测、扫描电镜观察。结果:在培养2周时,BMG/生物蛋白胶各种染色结果显示软骨细胞在其表面以及内部分布均匀,蛋白多糖和Ⅱ型胶原染色阳性;壳聚糖/明胶表面细胞稍多于前者,但内部细胞数量极少且分布不均,染色结果不如前者明显。随着培养时间的延长各种检测均显示有大量的软骨细胞特异性的蛋白多糖和Ⅱ型胶原的表达,壳聚糖/明胶凸显出明显的优势。结论:体外成功构建组织工程软骨,软骨细胞在BMG/生物蛋白胶上的生长、增殖和分泌基质情况优于壳聚糖/明胶支架。
