Differences in sphere-forming cells from keratoconic and normal corneal tissue: Implications for keratoconus...

Area of Science:

• Ophthalmology
• Stem Cell Biology
• Corneal Research

Background:

• Keratoconus is an anterior corneal disorder with unknown causes.
• Stem cells are implicated in corneal diseases, including keratoconus.
• Sphere-forming cells from normal corneas contain diverse cell types with therapeutic potential.

Purpose of the Study:

• To isolate and characterize sphere-forming cells from human keratoconic tissue.
• To investigate the behavior and markers of keratoconic sphere-forming cells in vitro.
• To compare keratoconic sphere-forming cells with those from normal corneas.

Main Methods:

• Culturing sphere-forming cells from keratoconic donor corneas.
• Time-lapse imaging to assess sphere behavior on collagen.
• Immunocytochemistry for stem cell (ABCB5) and myofibroblast markers.
• Droplet digital PCR for stem and stromal cell marker expression analysis.

Main Results:

• Keratoconic spheres exhibited impaired central core maintenance and reduced surface repopulation.
• Positive labeling for ABCB5 (stem cell marker) and alpha smooth muscle actin (myofibroblast marker) was observed.
• Keratoconic spheres showed increased stem and stromal cell marker expression compared to normal spheres at day 7.
• Keratoconic sphere-forming cells demonstrated faster wound healing and lacked central core retention.

Conclusions:

• Keratoconic stem cells may exist in a heightened wound repair state, compromising corneal maintenance.
• Sphere-forming cell populations in keratoconus differ significantly from those in normal corneas.
• These cellular differences may be crucial for understanding the etiology of keratoconus.