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Related Experiment Videos

Corneal epithelial rejection in the rat.

Francisco C Figueiredo1, Susan M Nicholls, David L Easty

  • 1Department of Ophthalmology, Royal Victoria Infirmary, Newcastle-upon-Tyne, United Kingdom.

Investigative Ophthalmology & Visual Science
|February 28, 2002
PubMed
Summary

Corneal graft rejection in rats shows epithelial rejection lines and T cell infiltration, similar to human responses. This early sign may predict higher risk of endothelial rejection in patients.

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Area of Science:

  • Ophthalmology
  • Immunology
  • Transplantation Biology

Background:

  • Corneal graft rejection is a significant clinical challenge.
  • Understanding the early cellular and molecular events in corneal rejection is crucial for improving graft survival.

Purpose of the Study:

  • To investigate the clinical and histological changes in the corneal epithelium during graft rejection in a rat model.
  • To identify the specific immune cells and molecules involved in epithelial rejection.

Main Methods:

  • Corneal transplantation was performed between different rat strains (LEW to PVG).
  • Clinical rejection was monitored using slit-lamp examination.
  • Epithelial sheets were analyzed for Langerhans cells (LC), leukocytes, and adhesion molecules using adenosine diphosphatase (ADPase) staining and immunohistology.

Main Results:

  • Clinical epithelial rejection lines were observed in 94% of allografts between days 10-15, coinciding with stromal opacity.
  • Significant infiltration of CD4+ and CD8+ T cells, macrophages, and granulocytes was found in allograft epithelia compared to isografts.
  • Expression of major histocompatibility complex (MHC) class II and intercellular adhesion molecule (ICAM)-1 was induced on epithelial cells.

Conclusions:

  • Epithelial rejection in rats mirrors human clinical presentation and occurs concurrently with stromal infiltration.
  • T cells appear to be the primary mediators of epithelial rejection, rather than macrophages.
  • Recognizing epithelial rejection in human corneal grafts may serve as an early indicator of increased risk for endothelial rejection.

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