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Stem Cells. 2018 Nov;36(11):1723-1735. doi: 10.1002/stem.2903. Epub 2018 Oct 1.

CD200 Expression Marks a Population of Quiescent Limbal Epithelial Stem Cells with Holoclone Forming Ability.

Author information

1
Institute of Genetic Medicine, Newcastle University, Newcastle, United Kingdom.
2
UCL Institute of Immunology and Transplantation, London, United Kingdom.
3
Department of Genetics and Developmental Biology, The Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel.
4
Tissue Services, NHS Blood and Transplant, Liverpool, United Kingdom.
5
Faculty of Medical Sciences, Department of Genetics, University of Kragujevac, Serbia.
6
SPEBO Medical, Leskovac, Kragujevac, Serbia.
7
Department of Ophthalmology, Royal Victoria Infirmary, Newcastle University, Newcastle, United Kingdom.

Abstract

One of the main challenges in limbal stem cell (LSC) biology and transplantation is the lack of definitive cell surface markers which can be used to identify and enrich viable LSCs. In this study, expression of 361 cell surface proteins was assessed in ex vivo expanded limbal epithelial cells. One marker, CD200 was selected for further characterization based on expression in a small subset of limbal epithelial cells (2.25% ± 0.69%) and reduced expression through consecutive passaging and calcium induced differentiation. CD200 was localized to a small population of cells at the basal layer of the human and mouse limbal epithelium. CD200+ cells were slow cycling and contained the majority of side population (SP) and all the holoclone forming progenitors. CD200+ cells displayed higher expression of LSCs markers including PAX6, WNT7A, CDH3, CK14, CK15, and ABCB5 and lower expression of Ki67 when compared to CD200- . Downregulation of CD200 abrogated the ability of limbal epithelial cells to form holoclones, suggesting an important function for CD200 in the maintenance and/or self-renewal of LSCs. A second marker, CD109, which was expressed in 56.29% ± 13.96% of limbal epithelial cells, was also found to co-localize with ΔNp63 in both human and mouse cornea, albeit more abundantly than CD200. CD109 expression decreased slowly through calcium induced cell differentiation and CD109+ cells were characterized by higher expression of Ki67, when compared to CD109- subpopulation. Together our data suggest that CD200 expression marks a quiescent population of LSCs with holoclone forming potential, while CD109 expression is associated with a proliferative progenitor phenotype. Stem Cells 2018;36:1723-1735.

KEYWORDS:

CD109; CD200; Cell surface markers; Limbal epithelial cells; Limbal stem cell; Limbal stem cell deficiency; Quiescent stem cells

PMID:
30157305
DOI:
10.1002/stem.2903

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