Department of Plastic and Reconstructive Surgery, Shanghai Tissue Engineering Center, Shanghai 9th People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China.
Biomed Mater. 2009 Aug;4(4):045012. doi: 10.1088/1748-6041/4/4/045012. Epub 2009 Jul 28.
The objective of this study was to compare the chondrogenesis in type I and II collagen scaffolds seeded with chondrocytes from three types of cartilage, after four weeks of culture: auricular (AU), articular (AR) and meniscal (ME). Related aims were to investigate the expression of a contractile muscle actin isoform, alpha-smooth muscle actin (SMA), in the cells in the scaffold and to determine the presence of a lubricating glycoprotein, lubricin, in the constructs. Adult goat AU, AR and ME chondrocytes were seeded into two types of collagen scaffolds: type II collagen and type I/III collagen. After four weeks of culture, the constructs were prepared for histochemical and immunohistochemical analysis of the distribution of glycosaminoglycan (GAG), types I and II collagen, elastin, SM and lubricin. AU constructs contained substantially more tissue than the AR and ME samples. The AU constructs exhibited neocartilage, but no elastin. There were no notable differences between the type I and II collagen scaffolds. Novel findings were the expression of SMA by the AU cells in the scaffolds and the presence of lubricin in the AR and AU constructs. AU cells have the capability to produce cartilage in collagen scaffolds under conditions in which there is little histogenesis by AR and ME cells.
本研究的目的是比较在 I 型和 II 型胶原支架中培养来自三种软骨(耳廓软骨 AU、关节软骨 AR 和半月板 ME)的软骨细胞 4 周后的软骨生成情况:(1)检测收缩肌肌动蛋白同工型 α-平滑肌肌动蛋白(SMA)在支架细胞中的表达情况;(2)确定构建体中是否存在润滑糖蛋白润滑素。将成年山羊 AU、AR 和 ME 软骨细胞接种到两种类型的胶原支架中:II 型胶原和 I/III 型胶原。培养 4 周后,对构建体进行组织化学和免疫组织化学分析,以检测糖胺聚糖(GAG)、I 型和 II 型胶原、弹性蛋白、SM 和润滑素的分布。AU 构建体的组织含量明显高于 AR 和 ME 样本。AU 构建体表现出新生软骨,但没有弹性蛋白。I 型和 II 型胶原支架之间没有明显差异。新发现是 AU 细胞在支架中的 SMA 表达和 AR 和 AU 构建体中的润滑素存在。在 AR 和 ME 细胞很少有组织发生的情况下,AU 细胞在胶原支架中具有产生软骨的能力。