Du Shou-Hui, Tay Johan Chin-Kang, Chen Can, Tay Felix-Chang, Tan Wee-Kiat, Li Zhen-Dong, Wang Shu
Department of Biological Sciences, National University of Singapore, Singapore 117543, Singapore.
Department of Biological Sciences, National University of Singapore, Singapore 117543, Singapore; Institute of Bioengineering and Nanotechnology, Singapore 138669, Singapore.
J Biosci Bioeng. 2015 Aug;120(2):210-7. doi: 10.1016/j.jbiosc.2014.12.009. Epub 2015 Jan 24.
Mouse embryonic fibroblasts (MEFs) are commonly used as feeder cells for the generation of human induced pluripotent stem cells (hiPSCs). However, medical applications of cell derivatives of hiPSCs generated with a MEF feeder system run the risk of having xeno-factor contamination due to long-term cell culturing under an animal factor-containing environment. We developed a new method for the derivation of human fibroblast-like cells (FLCs) from a previously established hiPSC line in an FLC differentiation medium. The method was based on direct differentiation of hiPSCs seeded on Matrigel followed by expansion of differentiating cells on gelatin. Using inactivated FLCs as feeder layers, primary human foreskin fibroblasts were successfully reprogrammed into a state of pluripotency by Oct4, Sox2 Klf4, and c-Myc (OSKM) transcription factor genes, with a reprogramming efficiency under an optimized condition superior to that obtained on MEF feeder layers. Furthermore, the FLCs were more effective in supporting the growth of human pluripotent stem cells. The pluripotency and differentiation capability of the cells cultured on FLC feeder layers were well retained. Our results suggest that FLCs are a safe alternative to MEFs for hiPSC generation and expansion, especially in the clinical settings wherein hiPSC derivatives will be used for medical treatment.
小鼠胚胎成纤维细胞(MEFs)通常用作生成人诱导多能干细胞(hiPSCs)的饲养层细胞。然而,在含动物因子的环境下长期细胞培养,使用MEF饲养系统生成的hiPSCs的细胞衍生物用于医学应用存在异源因子污染的风险。我们开发了一种新方法,可在FLC分化培养基中从先前建立的hiPSC系衍生出人成纤维样细胞(FLCs)。该方法基于接种在基质胶上的hiPSCs的直接分化,随后在明胶上扩增分化细胞。使用灭活的FLCs作为饲养层,通过Oct4、Sox2、Klf4和c-Myc(OSKM)转录因子基因成功将原代人包皮成纤维细胞重编程为多能状态,在优化条件下的重编程效率优于在MEF饲养层上获得的效率。此外,FLCs在支持人多能干细胞生长方面更有效。在FLC饲养层上培养的细胞的多能性和分化能力得到了很好的保留。我们的结果表明,对于hiPSC的生成和扩增,FLCs是MEFs的安全替代品,特别是在hiPSC衍生物将用于医学治疗的临床环境中。