Identification for Differential Localization of Putative Corneal Epithelial Stem Cells in Mouse and Human.

Identification for Differential Localization of Putative Corneal Epithelial Stem Cells in Mouse and Human.
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DOI:
10.1038/s41598-017-04569-w
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发表时间:
2017-07-12
期刊:
影响因子:
4.6
通讯作者:
Li DQ
Li DQ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Li J;Xiao Y;Coursey TG;Chen X;Deng R;Lu F;Pflugfelder SC;Li DQ

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人类角膜上皮干细胞(CESCs)已被发现存在于角膜缘中20多年。然而,CESCs在其他哺乳动物中的确切位置仍然难以捉摸。本研究旨在鉴定可能的CESCs在小鼠体内的差异定位。通过一系列不同方向的小鼠角膜切片,我们从解剖和形态上证实,小鼠角膜缘由最薄的上皮和最薄的基质组成,没有任何类似Vogt的壁龛结构。表达5种干/祖细胞标志物的细胞定位于整个小鼠角膜上皮的基底层。BrdU标记保留细胞是上皮干细胞的一个关键特征,在小鼠的角膜缘和中央角膜中都能检测到。从功能上讲,小鼠角膜中央和角膜缘可在培养中再生角膜上皮细胞。小鼠CESCs的这种分布不同于人类角膜,在人类角膜中,角膜缘干细胞的概念已经得到很好的确立和接受。我们意识到最近有一些新的证据支持小鼠角膜缘干细胞的概念。然而,重要的是要知道,当使用小鼠作为角膜研究的动物模型时,中央角膜可能提供另一种干细胞来源。
Human Corneal epithelial stem cells (CESCs) have been identified to reside in limbus for more than 2 decades. However, the precise location of CESCs in other mammalian remains elusive. This study was to identify differential localization of putative CESCs in mice. Through a series of murine corneal cross-sections from different directions, we identified that anatomically and morphologically the murine limbus is composed of the thinnest epithelium and the thinnest stroma without any palisades of Vogt-like niche structure. The cells expressing five of stem/progenitor cell markers are localized in basal layer of entire murine corneal epithelium. BrdU label-retaining cells, a key characteristic of epithelial stem cells, are detected in both limbal and central cornea of mouse eye. Functionally, corneal epithelium can be regenerated in cultures from central and limbal explants of murine cornea. Such a distribution of mouse CESCs is different from human cornea, where limbal stem cell concept has been well established and accepted. We are aware that some new evidence supports limbal stem cell concept in mouse recently. However, it is important to know that central cornea may provide an alternative source of stem cells when one utilizes mice as animal model for corneal research.
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