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Related Experiment Videos

Apoptosis in UV-exposed rabbit corneas.

A Podskochy1, L Gan, P Fagerholm

  • 1St. Erik's Eye Hospital, Karolinska Institutet, Stockholm, Sweden.

Cornea
|January 13, 2000
PubMed
Summary

Ultraviolet radiation (UVR) induces apoptosis, or programmed cell death, in rabbit corneas. Wavelengths of 310 nm caused more extensive corneal damage than 280 nm.

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Area of Science:

  • Ophthalmology
  • Cell Biology
  • Photobiology

Background:

  • Photokeratitis is a painful condition caused by overexposure to ultraviolet radiation (UVR).
  • The precise mechanisms of corneal cell death following UVR exposure are not fully understood.

Purpose of the Study:

  • To investigate apoptosis as a mechanism of corneal cell death induced by different UV wavelengths.
  • To compare the extent of corneal damage caused by 280 nm and 310 nm UVR.

Main Methods:

  • Albino rabbit corneas were exposed to 280 nm and 310 nm UVR.
  • Corneal tissues were analyzed using light microscopy, transmission electron microscopy, and TUNEL staining for fragmented DNA.
  • Analysis was performed 24 and 76 hours post-exposure.

Main Results:

  • TUNEL-positive staining, indicative of apoptosis, was observed in epithelial cells and keratocytes after 280 nm UVR.
  • 310 nm UVR induced apoptosis in epithelial cells, keratocytes throughout the stroma, and endothelial cells.
  • Extensive keratocyte loss in the stroma and damage to the endothelium were noted 76 hours after 310 nm UVR exposure.

Conclusions:

  • Apoptosis is a significant mechanism of corneal cell death following UVR exposure.
  • 310 nm UVR induces more severe and widespread damage to the cornea, including the stroma and endothelium, compared to 280 nm UVR.

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