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Related Experiment Videos

Cathepsin B in the rat eye.

Johan Wassélius1, Hanna Wallin, Magnus Abrahamson

  • 1Department of Ophthalmology, University of Lund, 221 85, Lund, Sweden. johan.wasselius@oft.lu.se

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|October 31, 2003
PubMed
Summary

Cathepsin B, a cysteine protease, is found in various rat eye tissues, including the cornea, lens, and retina. This enzyme, likely produced locally, is stored in cytoplasmic granules, suggesting a role in ocular functions.

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Area of Science:

  • Ophthalmology
  • Molecular Biology
  • Cell Biology

Background:

  • Cathepsin B is a mammalian cysteine protease implicated in ocular pathologies like keratoconus and corneal responses to infection.
  • Understanding its distribution in the eye is crucial for investigating its physiological and pathological roles.

Purpose of the Study:

  • To investigate the localization and expression of cathepsin B within different tissues of the rat eye.
  • To determine if cathepsin B is locally produced in these ocular tissues.

Main Methods:

  • Western blotting and immunohistochemistry were employed to detect cathepsin B protein in rat ocular tissues.
  • Quantitative real-time cDNA amplification (QRT-PCR) was used to analyze cathepsin B mRNA levels.

Main Results:

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  • Cathepsin B was identified in the cornea (epithelium, stroma, endothelium), ciliary body epithelium, iris stroma, lens anterior subcapsular epithelium, and retina.
  • Immunohistochemistry revealed cathepsin B localized within cytoplasmic granules, presumed to be lysosomes, in all detected cell types.
  • QRT-PCR confirmed the presence of cathepsin B mRNA in these tissues, with levels correlating to protein detection, indicating local synthesis.

Conclusions:

  • Cathepsin B is widely distributed throughout the rat eye, present in multiple cell types and tissues.
  • The enzyme is localized to lysosomes, suggesting a role in cellular degradation or processing pathways.
  • The presence of mRNA indicates that cathepsin B is likely synthesized within these ocular cells.