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Calpain in rat cornea.

M Azuma¹, R S Anderson, S Sameshima

¹Department of Biochemistry, School of Dentistry, Oregon Health Sciences University, Portland 97201.

Investigative Ophthalmology & Visual Science

|July 1, 1992

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This study describes calpain proteolytic enzyme in rat corneas, finding its distribution in the epithelium doesn't change with maturation. Calpain may aid in epithelial cell turnover during normal corneal development.

Area of Science:

Biochemistry
Enzymology
Ophthalmology

Background:

Calpains are calcium-dependent cysteine proteases involved in various cellular processes.
Understanding calpain's role in the cornea is crucial for ocular health research.

Purpose of the Study:

To characterize calpain proteolytic enzyme (EC 3.4.22.17) in normal rat corneas.
To document immunohistochemical changes in calpain distribution during corneal maturation.

Main Methods:

Diethylaminoethyl chromatography and high-performance liquid chromatography for protein fractionation.
Enzyme-linked immunosorbent assay (ELISA), immunoblotting, and caseinolytic activity assays for calpain analysis.
Immunohistochemical analysis to determine calpain distribution within corneal layers.

Related Experiment Videos

Main Results:

Calpain II eluted similarly to other tissues and was inhibited by E64, with an 80-kDa subunit.
Specific activity of calpain was higher in 2-week-old rat corneas than in 3-month-old corneas.
Calpain was detected in all epithelial layers but not the stroma; its distribution remained unchanged with corneal maturation.

Conclusions:

Calpain is present in the rat corneal epithelium and its distribution is consistent throughout maturation.
The study hypothesizes a role for calpain in the turnover of epithelial cells during normal corneal development.