Epithelial stem cells of the eye surface.

Area of Science:

• Ophthalmology and regenerative medicine
• Stem cell biology and tissue engineering

Background:

• The cornea and conjunctiva epithelia possess distinct stem cells with self-renewal and differentiation capabilities.
• The limbus serves as a transition zone housing these stem cells, whose regulatory mechanisms remain incompletely understood.
• Stem cell behavior is governed by signals and interactions within specialized microenvironments known as 'niches'.

Purpose of the Study:

• To review current knowledge of stem cell niches in the eye surface epithelia.
• To highlight recent advancements in identifying and characterizing these adult epithelial stem cells.
• To discuss the potential for therapeutic applications in regenerative medicine.

Main Methods:

• Review of existing literature on ocular surface stem cell niches.
• Analysis of recent cellular, molecular, and mechanistic findings.
• Evaluation of advancements in ex vivo cell culture techniques.

Main Results:

• Progress has been made in identifying and characterizing ocular surface stem cells and their niches.
• Improved cell culture methods allow for selective expansion of these stem cells ex vivo.
• Technical advances facilitate the study of stem cell regulation by niche components.

Conclusions:

• Understanding stem cell niches is crucial for controlling stem cell behavior.
• Regenerative transplantation of cornea and conjunctiva using adult epithelial stem cells is becoming a reality.
• Significant prospects exist for therapeutic applications of ocular surface stem cells.