软骨发生
阿格里坎
II型胶原
化学
细胞生物学
硫氧化物9
整合素
Ⅰ型胶原
细胞分化
细胞
电池类型
组织工程
脂肪组织
基因表达
干细胞
解剖
生物医学工程
生物
基因
病理
骨关节炎
软骨
生物化学
内分泌学
医学
替代医学
关节软骨
作者
Zufu Lu,Behrouz Zandieh‐Doulabi,ChunLing Huang,Ruud A. Bank,Marco N. Helder
出处
期刊:Tissue Engineering Part A
[Mary Ann Liebert]
日期:2010-01-01
卷期号:16 (1): 81-90
被引量:102
标识
DOI:10.1089/ten.tea.2009.0222
摘要
Ideally, biomaterials have inductive properties, favoring specific lineage differentiation. For chondrogenic induction, these properties have been attributed to collagen type II. However, the underlying mechanisms are largely unknown. This study aimed to investigate whether collagen type II favors chondrogenic induction by affecting cell shape through β1 integrins and Rho A/Rock signaling. For this purpose, adipose tissue–derived stem cells (ASCs) were encapsulated in collagen type I or II gels and cultured in plain and chondrogenic medium. It was demonstrated that (i) ASCs showed more efficient chondrogenic induction (higher collagen X, aggrecan, sox6, sox9, and collagen II gene expression) in both plain and chondrogenic media in collagen type II versus collagen type I gels; (ii) ASCs showed lower Rock 2 gene expression and a more rounded cell shape in collagen type II versus type I gels when grown in plain medium; (iii) Rock inhibitor (Y27632) more effectively enhanced chondrogenic gene expression of ASCs in collagen type I than in collagen type II gels, and diminished differences in chondrogenic gene expression and cell shape of ASCs between the two gel types; and (iv) β1 integrins blocking not only reduced the differences of chondrogenic gene expression but also eliminated the differences of Rock 1 and Rock 2 gene expressions and cell shape when comparing ASCs embedded in collagen type I and II gels. We conclude that collagen type II provides the inductive signaling for chondrogenic differentiation in ASCs by evoking a round cell shape through β1 integrin–mediated Rho A/Rock signaling pathway.
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