首页> 外文期刊>Acta biomaterialia >Effect of pore size on ECM secretion and cell growth in gelatin scaffold for articular cartilage tissue engineering.
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Effect of pore size on ECM secretion and cell growth in gelatin scaffold for articular cartilage tissue engineering.

机译:孔径对关节软骨组织工程用明胶支架中ECM分泌和细胞生长的影响。

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摘要

A novel method for the preparation of gelatin scaffolds was designed by varying the crosslinking temperature. Four pore size ranges of genipin-crosslinked gelatin scaffolds were made by varying the crosslinking temperature from 10 to 25 degrees C, with the pore sizes ranging from 50 to 500 microm. The pore size of the scaffold increases as the crosslinking temperature increases. Articular chondrocytes of Wistar rats were in vitro cultured in these scaffolds. DNA assay, glycosaminoglycan (GAG) assay, hematoxylin-eosin staining, Safranin-O staining and reverse transcription-polymerase chain reaction were performed to analyze the effect of the pore size on cell growth and the secretion of extracellular matrix (ECM). As the pores become larger, the rate of cell growth and the amount of GAG secretion increase, and the expressions of all four gene markers for aggrecan, collagen type I, collagen type II and collagen type X increase. The cells in the smaller pores often show a dedifferentiated form. The phenotype of the cells is maintained better in larger pores. Chondrocytes prefer the group of scaffolds with pore size between 250 and 500 microm for better proliferation and ECM production. The size of the space for cell growth is a key factor for cell metabolism.
机译:通过改变交联温度,设计了一种制备明胶支架的新方法。通过使交联温度在10到25摄氏度之间变化,并在50到500微米的范围内变化,可以制成genipin交联的明胶支架的四个孔径范围。支架的孔径随着交联温度的升高而增加。在这些支架中体外培养Wistar大鼠的关节软骨细胞。进行DNA测定,糖胺聚糖(GAG)测定,苏木精-曙红染色,番红O-O染色和逆转录-聚合酶链反应,以分析孔径对细胞生长和细胞外基质(ECM)分泌的影响。随着孔变大,细胞生长速率和GAG分泌量增加,聚集蛋白聚糖,I型胶原,II型胶原和X型胶原的所有四个基因标记的表达均增加。较小孔中的细胞通常显示去分化形式。在较大的孔中,细胞的表型保持得更好。软骨细胞更喜欢孔径在250至500微米之间的支架,以更好地增殖和产生ECM。细胞生长空间的大小是细胞代谢的关键因素。

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