1 Ghent-Fertility and Stem Cell Team (G-FaST), Department for Reproductive Medicine, Ghent University Hospital, Ghent, Belgium.
2 Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, the Netherlands.
Stem Cells Dev. 2019 May 1;28(9):579-592. doi: 10.1089/scd.2018.0199. Epub 2019 Apr 2.
Human embryonic stem cells (hESCs) hold great value for future clinical applications. However, standard culture conditions maintain hESCs in a primed state, which bears heterogeneity in pluripotency and a tendency for spontaneous differentiation. To counter these drawbacks, primed hESCs have been converted to a naive state, but this has restricted the efficiency of existing directed differentiation protocols. In mouse, WNT inhibition by inhibitor of WNT production-2, together with a higher dose of fibroblast growth factor 2 (12 ng/mL) in DMEM/F12 basal medium (DhiFI), markedly improved derivation and maintenance of primed mouse epiblast stem cells. In this study, we show that DhiFI conditions similarly improved primed hESC traits, such as conferring a primed transcriptional signature with high levels of pluripotency markers and reduced levels of differentiation markers. When triggered to differentiate to neuronal and cardiac lineages, DhiFI hESCs and isogenic primed hESCs progressed similarly. Moreover, DhiFI conditions supported the derivation of hESC lines from a post-inner cell mass intermediate (PICMI). DhiFI-derived hESCs showed less spontaneous differentiation and expressed significantly lower levels of lineage-specific markers, compared to primed-derived lines from the same PICMI. Overall, DhiFI hESCs retained advantages of both primed and naive pluripotency and may ultimately represent a more favorable starting point for differentiation toward clinically desired cell types.
人类胚胎干细胞 (hESC) 在未来的临床应用中具有重要价值。然而,标准培养条件使 hESC 处于初始状态,具有多能性异质性和自发分化的趋势。为了克服这些缺点,初始 hESC 已被转化为原始状态,但这限制了现有定向分化方案的效率。在小鼠中,WNT 生产抑制剂-2 的抑制作用,以及 DMEM/F12 基础培养基 (DhiFI) 中更高剂量的成纤维细胞生长因子 2 (12ng/mL),显著改善了初始小鼠上胚层干细胞的衍生和维持。在这项研究中,我们表明 DhiFI 条件同样改善了初始 hESC 的特性,例如赋予具有高水平多能性标志物和降低分化标志物水平的初始转录特征。当被触发分化为神经元和心脏谱系时,DhiFI hESC 和同基因初始 hESC 进展相似。此外,DhiFI 条件支持从内部细胞团中间体 (PICMI) 衍生 hESC 系。与来自相同 PICMI 的初始衍生系相比,DhiFI 衍生的 hESC 自发性分化较少,并且表达的谱系特异性标志物水平显著降低。总体而言,DhiFI hESC 保留了初始和原始多能性的优势,并且可能最终代表了更有利于向临床所需细胞类型分化的起点。