Suppr超能文献

通过体外复制角膜上皮干细胞微环境将人胚胎干细胞分化为角膜上皮样细胞。

Differentiation of human embryonic stem cells into corneal epithelial-like cells by in vitro replication of the corneal epithelial stem cell niche.

作者信息

Ahmad Sajjad, Stewart Rebecca, Yung Sun, Kolli Sai, Armstrong Lyle, Stojkovic Miodrag, Figueiredo Francisco, Lako Majlinda

机构信息

Centre for Stem Cell Biology and Developmental Genetics, University of Newcastle, Newcastle upon Tyne, United Kingdom.

出版信息

Stem Cells. 2007 May;25(5):1145-55. doi: 10.1634/stemcells.2006-0516. Epub 2007 Jan 25.

Abstract

Human embryonic stem cells (hESCs) are pluripotent cells capable of differentiating into any cell type of the body. It has long been known that the adult stem cell niche is vital for the maintenance of adult stem cells. The cornea at the front of the eye is covered by a stratified epithelium that is renewed by stem cells located at its periphery in a region known as the limbus. These so-called limbal stem cells are maintained by factors within the limbal microenvironment, including collagen IV in basement membrane and limbal fibroblasts in the stroma. Because this niche is very specific to the stem cells (rather than to the more differentiated cells) of the corneal epithelium, it was hypothesized that replication of these factors in vitro would result in hESC differentiation into corneal epithelial-like cells. Indeed, here we show that culturing of hESC on collagen IV using medium conditioned by the limbal fibroblasts results in the loss of pluripotency and differentiation into epithelial-like cells. Further differentiation results in the formation of terminally differentiated epithelial-like cells not only of the cornea but also of skin. Scanning electron microscopy shows that some differences exist between hESC-derived and adult limbal epithelial-like cells, necessitating further investigation using in vivo animal models of limbal stem cell deficiency. Such a model of hESC differentiation is useful for understanding the early events of epithelial lineage specification and to the eventual potential application of epithelium differentiated from hESC for clinical conditions of epithelial stem cell loss. Disclosure of potential conflicts of interest is found at the end of this article.

摘要

人类胚胎干细胞(hESCs)是能够分化为身体任何细胞类型的多能细胞。长期以来,人们一直知道成体干细胞微环境对于维持成体干细胞至关重要。眼睛前部的角膜被复层上皮覆盖,该上皮由位于其周边一个称为角膜缘的区域中的干细胞更新。这些所谓的角膜缘干细胞由角膜缘微环境中的因素维持,包括基底膜中的IV型胶原蛋白和基质中的角膜缘成纤维细胞。由于这种微环境对角膜上皮的干细胞(而非更分化的细胞)非常特异,因此有人推测在体外复制这些因素会导致hESCs分化为角膜上皮样细胞。事实上,我们在此表明,使用角膜缘成纤维细胞条件培养基在IV型胶原蛋白上培养hESCs会导致多能性丧失并分化为上皮样细胞。进一步的分化不仅导致形成终末分化的角膜上皮样细胞,还导致形成皮肤上皮样细胞。扫描电子显微镜显示,hESC来源的和成人角膜缘上皮样细胞之间存在一些差异,这需要使用角膜缘干细胞缺陷的体内动物模型进行进一步研究。这种hESC分化模型有助于理解上皮谱系特化的早期事件,以及最终将hESC分化的上皮应用于上皮干细胞丢失的临床情况的潜在可能性。潜在利益冲突的披露见本文末尾。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验