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Identification of Two Distinct Stem Cell Clusters, Lrig1-Derived and Wnt/CD44-Dependent, in Corneal Epithelium

Authors: Barnes, Laurent; Konstantinou, Evangelia; Saurat, Jean-Hilaire; Moulin, Alexandre; Kaya, Guerkan;

Identification of Two Distinct Stem Cell Clusters, Lrig1-Derived and Wnt/CD44-Dependent, in Corneal Epithelium

Abstract

We previously showed that selective suppression of CD44 in the corneal epithelium leads to structural abnormalities in the mouse cornea. Our comparative studies of young and aged ocular biopsies revealed that CD44 expression is downregulated in aged corneas, while leucine-rich repeats and immunoglobulin-like domain 1 (Lrig1+) stem cells remain preserved in the peripheral limbus. These findings suggest an age-related shift in the corneal stem cell compartmentalization, characterized by impaired CD44 expression in the central cornea and preservation of Lrig1+ stem cells in the limbus, which become the main stem cells in the senescent cornea. To investigate this further, we performed topical tamoxifen-inducible, diphtheria toxin-mediated ablation of Lrig1+ stem cells in mouse corneas. We then assessed both activated and non-activated beta-catenin expression in wild-type (WT) and CD44 knockout (CD44KO) mice, given that CD44 modulates the Wingless-related integration site (Wnt) pathway. Our results indicate that two distinct stem cell populations operate in the mouse cornea: Lrig1-derived stem cells and Wnt-activity/CD44-dependent stem cells. The Lrig1-derived cells act as a reservoir of quiescent stem cells that regenerate the cornea upon injury, whereas under homeostatic conditions, the Wnt-activity/CD44-dependent stem cells are primarily responsible for corneal renewal. In the aged cornea, the loss of CD44 expression leads to reduced Wnt signaling, making the tissue increasingly dependent on Lrig1+ stem cells for regeneration. In mice, Lrig1+ stem cells are capable of sustaining permanent corneal renewal, even in the absence of CD44.

Keywords

Stem Cells / metabolism, Nerve Tissue Proteins, 616.07, Ablation, Cornea, Epithelium, Corneal / metabolism, Wnt, Mice, 616, Lrig1, Membrane Glycoproteins / metabolism, 617, Animals, CD44, Wnt Signaling Pathway, Mice, Knockout, Stem cell, Communication, Hyaluronan Receptors / genetics, Epithelium, Corneal / cytology, Animals; Hyaluronan Receptors/metabolism; Hyaluronan Receptors/genetics; Epithelium, Corneal/metabolism; Epithelium, Corneal/cytology; Stem Cells/metabolism; Stem Cells/cytology; Mice; Wnt Signaling Pathway; Mice, Knockout; Membrane Glycoproteins/metabolism; Membrane Glycoproteins/genetics; Mice, Inbred C57BL; beta Catenin/metabolism; Nerve Tissue Proteins; CD44; Lrig1; Wnt; ablation; cornea; stem cell; tamoxifen, Mice, Inbred C57BL, Tamoxifen, Hyaluronan Receptors / metabolism, Stem Cells / cytology, Membrane Glycoproteins / genetics, Beta Catenin / metabolism

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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