Reproductive Medical Center, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, People's Republic of China.
J Biomed Mater Res A. 2010 Aug;94(2):539-46. doi: 10.1002/jbm.a.32732.
In this study a three step culture system, 2D-3D sequential culture in vitro and further implantation in vivo was developed to induce human embryonic stem cells (hESCs) into cartilage like tissues. Five-day-old embryoid bodies were plated for chondrogenic induction for 27 days (step1), then the cells were suspended in alginate and seeded onto polylactic-co-glycolic acid (PLGA) scaffolds for 3D cultivation for 7 days (step 2) and the cells/alginate/PLGA complexes were further transplanted into nude mice for 8 weeks (step 3). At same time, some of complexes were cultured in vitro up to 8 weeks. At the end of step 1, cells exhibited fibroblast-like morphology and expressed chondrocyte-specific markers, Sox 9 and collagen II. During the following 8 weeks of 3D cultivation in vitro, cells displayed spherical morphology, decreased immunoreactivity to Sox-9 and increased one to collagen II, demonstrated further differentiation to mature chondrocyte. In implanted grafts, not only cells appeared typical chondrocytes shape and markers but also cartilage like tissues were formed. These results indicate that 2D-3D sequential culture in vitro is an efficient protocol to induce hESCs differentiates into chondrocytes, while the three step culture system may be an appropriate procedure to derive cartilage like tissues from hESCs.
在这项研究中,开发了一种三步培养系统,即体外 2D-3D 序贯培养,然后进一步体内植入,以诱导人胚胎干细胞(hESC)分化为软骨样组织。将 5 天龄的类胚体接种于软骨诱导培养基中培养 27 天(第 1 步),然后将细胞悬浮于藻酸盐中,并接种于聚乳酸-共-羟基乙酸(PLGA)支架上进行 3D 培养 7 天(第 2 步),随后将细胞/藻酸盐/PLGA 复合物进一步移植到裸鼠体内 8 周(第 3 步)。同时,一些复合物在体外培养至 8 周。在第 1 步结束时,细胞呈现出成纤维细胞样形态,并表达软骨细胞特异性标志物 Sox9 和胶原 II。在随后的 8 周 3D 体外培养过程中,细胞呈现出球形形态,Sox-9 的免疫反应性降低,而胶原 II 的免疫反应性增加,进一步向成熟软骨细胞分化。在植入的移植物中,不仅细胞呈现出典型的软骨细胞形态和标志物,而且还形成了软骨样组织。这些结果表明,体外 2D-3D 序贯培养是诱导 hESC 分化为软骨细胞的有效方案,而三步培养系统可能是从 hESC 中获得软骨样组织的合适程序。
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