Totonchi Mehdi, Taei Adeleh, Seifinejad Ali, Tabebordbar Mohammadsharif, Rassouli Hassan, Farrokhi Ali, Gourabi Hamid, Aghdami Nasser, Hosseini-Salekdeh Ghasem, Baharvand Hossein
Department of Stem Cells and Developmental Biology, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran.
Int J Dev Biol. 2010;54(5):877-86. doi: 10.1387/ijdb.092903mt.
Although human induced pluripotent stem cells (hiPSCs) hold great promise as a source of differentiated cells for vast therapeutic implications, many obstacles still need to be surmounted before this can become a reality. One obstacle, a robust feeder- and serum-free system to generate and expand hiPSCs in culture is still unavailable. Here, for the first time, we describe a novel establishment and maintenance culture technique that uses human dermal fibroblasts to generate hiPSCs by introducing four factors, Klf4, Oct4, Sox2, and c-Myc under serum- and feeder-independent conditions. We have used a serum replacement product, conditioned medium (CM), or feeder-free medium (FFM) supplemented with high elevated basic-fibroblast growth factor in the absence or presence of Matrigel. Our FFM system in the presence of Matrigel enhanced the efficiency of alkaline phosphatase-positive colonies at a frequency at least 10-fold greater than the conventional method on feeder cells. The established hiPSCs are similar to human embryonic stem cells in many aspects including morphology, passaging, surface and pluripotency markers, normal karyotype, gene expression, ultrastructure, and in vitro differentiation. Such hiPSCs could be useful particularly in the context of in vitro disease modeling, pharmaceutical screening and in cellular replacement therapies once the safety issues have been overcome.
尽管人类诱导多能干细胞(hiPSC)作为分化细胞来源具有巨大的治疗潜力,但在其成为现实之前仍需克服许多障碍。其中一个障碍是,目前仍缺乏一种在无饲养层和无血清条件下生成和扩增hiPSC的强大体系。在此,我们首次描述了一种新颖的建立和维持培养技术,该技术利用人皮肤成纤维细胞,通过在无血清和无饲养层条件下导入Klf4、Oct4、Sox2和c-Myc这四种因子来生成hiPSC。我们使用了一种血清替代产品、条件培养基(CM)或添加了高浓度碱性成纤维细胞生长因子的无饲养层培养基(FFM),有无基质胶均可。在有基质胶存在的情况下,我们的FFM体系提高了碱性磷酸酶阳性集落的形成效率,其频率比传统饲养层细胞培养方法至少高10倍。所建立的hiPSC在形态、传代、表面和多能性标志物、正常核型、基因表达、超微结构以及体外分化等许多方面与人类胚胎干细胞相似。一旦克服了安全问题,这种hiPSC在体外疾病建模、药物筛选以及细胞替代治疗方面可能会特别有用。