Laminin E8 fragments support efficient adhesion and expansion of dissociated human pluripotent stem cells.

Laminin E8 fragments support efficient adhesion and expansion of dissociated human pluripotent stem cells.
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DOI:
10.1038/ncomms2231
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发表时间:
2012
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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人类胚胎干细胞(hESC)和诱导多能干细胞(hiPSC)有潜力为再生医学提供无限的组织来源。尽管已开发出明确的无异源培养基,但 hESC 可靠繁殖的培养条件仍需要相当大的改进。在这里,我们表明,层粘连蛋白亚型的重组 E8 片段 (LM-E8s) 是赋予整合素结合活性的最小片段,与 Matrigel 和完整的层粘连蛋白亚型相比,可促进 hESC 和 hiPSC 更大的粘附。此外,LM-E8s 在确定的无异源培养基中通过解离的细胞传代维持 hESC 和 hiPSC 的长期自我更新。我们在 LM-E8 上成功地在三种确定的培养基中维持了 3 个 hESC 和 2 个 hiPSC 系 10 次传代。 hESC 保持高水平的多能性标记表达,在 30 代后具有正常的核型,并且可以分化为所有三个胚层。该培养系统允许 hESC 和 hiPSC 强劲增殖,用于治疗应用。 使用动物产品作为人类胚胎干细胞和诱导多能干细胞培养的培养基质在治疗环境中引起了许多安全问题。 Miyazaki 等人表明,人类层粘连蛋白的最小片段为这些细胞类型的培养提供了更有效的支持。
Human embryonic stem cells (hESCs) and induced pluripotent stem cells (hiPSCs) have the potential to provide an infinite source of tissues for regenerative medicine. Although defined xeno-free media have been developed, culture conditions for reliable propagation of hESCs still require considerable improvement. Here we show that recombinant E8 fragments of laminin isoforms (LM-E8s), which are the minimum fragments conferring integrin-binding activity, promote greater adhesion of hESCs and hiPSCs than do Matrigel and intact laminin isoforms. Furthermore, LM-E8s sustain long-term self-renewal of hESCs and hiPSCs in defined xeno-free media with dissociated cell passaging. We successfully maintained three hESC and two hiPSC lines on LM-E8s in three defined media for 10 passages. hESCs maintained high level expression of pluripotency markers, had a normal karyotype after 30 passages and could differentiate into all three germ layers. This culture system allows robust proliferation of hESCs and hiPSCs for therapeutic applications. The use of animal products as culture substrates for human embryonic stem cell and induced pluripotent stem cell culture raises numerous safety concerns in a therapeutic setting. Miyazaki et al.. show that minimal fragments of human laminins provide a more effective support for the culture of these cell types.
克隆衍生的人类胚胎干细胞系在长期培养过程中保持多能性和增殖潜力
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