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一种合成的、无动物源的肽表面,用于人诱导多能干细胞的扩增和定向分化。

A synthetic, xeno-free peptide surface for expansion and directed differentiation of human induced pluripotent stem cells.

机构信息

Department of Biomedical Engineering, College of Engineering, University of Arkansas, Fayetteville, AR, USA.

出版信息

PLoS One. 2012;7(11):e50880. doi: 10.1371/journal.pone.0050880. Epub 2012 Nov 30.

Abstract

Human induced pluripotent stem cells have the potential to become an unlimited cell source for cell replacement therapy. The realization of this potential, however, depends on the availability of culture methods that are robust, scalable, and use chemically defined materials. Despite significant advances in hiPSC technologies, the expansion of hiPSCs relies upon the use of animal-derived extracellular matrix extracts, such as Matrigel, which raises safety concerns over the use of these products. In this work, we investigated the feasibility of expanding and differentiating hiPSCs on a chemically defined, xeno-free synthetic peptide substrate, i.e. Corning Synthemax(®) Surface. We demonstrated that the Synthemax Surface supports the attachment, spreading, and proliferation of hiPSCs, as well as hiPSCs' lineage-specific differentiation. hiPSCs colonies grown on Synthemax Surfaces exhibit less spread and more compact morphology compared to cells grown on Matrigel™. The cytoskeleton characterization of hiPSCs grown on the Synthemax Surface revealed formation of denser actin filaments in the cell-cell interface. The down-regulation of vinculin and up-regulation of zyxin expression were also observed in hiPSCs grown on the Synthemax Surface. Further examination of cell-ECM interaction revealed that hiPSCs grown on the Synthemax Surface primarily utilize α(v)β(5) integrins to mediate attachment to the substrate, whereas multiple integrins are involved in cell attachment to Matrigel. Finally, hiPSCs can be maintained undifferentiated on the Synthemax Surface for more than ten passages. These studies provide a novel approach for expansion of hiPSCs using synthetic peptide engineered surface as a substrate to avoid a potential risk of contamination and lot-to-lot variability with animal derived materials.

摘要

人诱导多能干细胞有可能成为细胞替代治疗的无限细胞来源。然而,这种潜力的实现取决于是否有强大、可扩展且使用化学定义材料的培养方法。尽管 hiPSC 技术取得了重大进展,但 hiPSC 的扩增仍依赖于使用动物源性细胞外基质提取物,如 Matrigel,这引起了对这些产品使用的安全性担忧。在这项工作中,我们研究了在化学定义、无动物源的合成肽底物上扩增和分化 hiPSC 的可行性,即康宁 Synthemax(®)Surface。我们证明 Synthemax Surface 支持 hiPSC 的附着、铺展和增殖,以及 hiPSC 的谱系特异性分化。与在 Matrigel™上生长的细胞相比,在 Synthemax Surface 上生长的 hiPSC 集落表现出更少的铺展和更紧凑的形态。在 Synthemax Surface 上生长的 hiPSC 的细胞骨架表征显示细胞-细胞界面中形成了更密集的肌动蛋白丝。还观察到在 Synthemax Surface 上生长的 hiPSC 中粘着斑蛋白的下调和斑联蛋白的上调。进一步研究细胞-ECM 相互作用表明,在 Synthemax Surface 上生长的 hiPSC 主要利用α(v)β(5)整合素来介导与底物的附着,而多个整合素参与细胞与 Matrigel 的附着。最后,hiPSC 可以在 Synthemax Surface 上保持未分化状态超过十代。这些研究提供了一种使用合成肽工程表面作为底物来扩增 hiPSC 的新方法,以避免潜在的污染风险和动物源性材料的批次间变异性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9bc7/3511414/9ad6bcd13e42/pone.0050880.g001.jpg

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