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A new epithelial cell type in the human cornea

B Lauweryns1, J J van den Oord, R De Vos

  • 1Department of Ophthalmology, University Hospital Sint-Rafaël, Catholic University of Leuven, Belgium.

Investigative Ophthalmology & Visual Science
|May 1, 1993
PubMed
Summary

Researchers identified a new epithelial cell type in the human cornea. These cells, found at the limbus, express vimentin and cytokeratin 19, suggesting they may be corneal stem cells.

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Area of Science:

  • Ophthalmology
  • Cell Biology
  • Histology

Background:

  • The human cornea's cellular composition and regenerative potential are crucial for maintaining vision.
  • Intermediate filaments are key structural components of cells, with distinct profiles in different cell types.

Purpose of the Study:

  • To investigate the expression and characteristics of intermediate filaments within the human cornea.
  • To identify and characterize novel cell populations within the corneal epithelium.

Main Methods:

  • Utilized light and electron microscopy on 20 human corneas.
  • Performed immunohistochemical analysis on frozen corneal sections.
  • Examined cellular morphology, nuclear features, and intermediate filament protein expression.

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Main Results:

  • Discovered a previously unrecognized epithelial cell population predominantly in the superior cornea, near the limbus.
  • These cells exhibited unique ultrastructural features, including marginated nuclear chromatin and abundant intermediate filaments.
  • Immunohistochemistry revealed strong co-expression of vimentin and cytokeratin 19, with negativity for other cytokeratins and cell markers.

Conclusions:

  • A novel epithelial cell type in the human cornea has been identified, characterized by specific intermediate filament expression (vimentin and cytokeratin 19).
  • The unique localization and molecular profile suggest these cells may represent human corneal stem cells.
  • Further research is warranted to fully elucidate the phenotype and function of these potential stem cells.