Human corneal limbal organoids maintaining limbal stem cell niche function

Area of Science:

• Ophthalmology
• Stem Cell Biology
• Tissue Engineering

Background:

• Corneal epithelial stem cells are crucial for maintaining corneal health.
• These stem cells are located in the limbal region.
• Current treatments for limbal stem cell deficiency have limitations.

Purpose of the Study:

• To investigate the potential of limbal organoids as a source of transplantable limbal stem cells.
• To evaluate the characteristics and functionality of in vitro-expanded limbal organoids.
• To assess the in vivo engraftment and therapeutic potential of limbal organoids.

Main Methods:

• Limbal tissue was processed to isolate cells, which were then cultured on Matrigel to form organoids.
• Organoids were characterized for progenitor cell markers (K15, p63) and N-cadherin expression.
• Limbal organoids were transplanted into a rabbit model of limbal deficiency to assess in vivo integration.

Main Results:

• Approximately 500 limbal organoids were generated from a single donor cornea within one month.
• Organoids from superior and inferior limbus exhibited higher colony-forming efficiency and more progenitor cells.
• Transplanted organoids successfully integrated into the host cornea, providing epithelial cells in the rabbit model.

Conclusions:

• Limbal organoids can be maintained in vitro for up to one month, preserving limbal stem cell phenotype.
• These organoids can generate fully stratified corneal epithelium with basal progenitor cells.
• Limbal organoids represent a promising and efficient cell source for clinical use in treating limbal stem cell deficiency.