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Oxygen tension affects terminal differentiation of corneal limbal epithelial cells.
MedLine Citation:
PMID:  21660966     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Oxygen concentration has been shown to be crucial in the proliferation and differentiation of various types of cells, while the impact of oxygen tension on the lineage commitment of epithelial cells remains elusive. In this study, we investigated the effect of hypoxia on the differentiation of corneal limbal epithelium using an ex vivo squamous metaplasia model. Under normoxic conditions when exposed to air, the hyperproliferation and abnormal epidermal-like differentiation of human corneal limbal epithelium was induced, whereas when exposed to air under hypoxic conditions, although we observed augmented proliferation, the abnormal differentiation was inhibited. The Notch signaling pathway was activated in hypoxic cultures, whereas the p38 MAPK signaling pathway was downregulated. The addition of Notch inhibitor under hypoxic conditions restored the activation of p38 MAPK and resulted in the recidivation of limbal epithelial cells to epidermal-like differentiation. Moreover, the epidermal-like differentiation of rabbit limbal epithelial cells was also blocked under hypoxic conditions in corneal epithelial cell sheets engineered ex vivo. We concluded that hypoxia can prevent abnormal differentiation while enhancing the proliferation of corneal limbal epithelial cells. Hypoxia coupled with air exposure can be used in the tissue engineering of corneal limbal epithelium. J. Cell. Physiol. 226: 2429-2437, 2011. © 2010 Wiley-Liss, Inc.
Authors:
Cheng Li; Tingting Yin; Nuo Dong; Fei Dong; Xiaowei Fang; Yang-Luowa Qu; Yehui Tan; Huping Wu; Zuguo Liu; Wei Li
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of cellular physiology     Volume:  226     ISSN:  1097-4652     ISO Abbreviation:  J. Cell. Physiol.     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-06-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0050222     Medline TA:  J Cell Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2429-37     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Wiley-Liss, Inc.
Affiliation:
Eye Institute & Affiliated Xiamen Eye Center, Xiamen University Medical College, Xiamen, Fujian, China; Xiamen University School of Life Science, Xiamen, Fujian, China; Fujian Provincial Key Laboratory of Ophthalmology and Visual Science, Xiamen, Fujian, China.
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