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Related Experiment Videos

Calpain II in human lens.

L L David1, M D Varnum, K J Lampi

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

Investigative Ophthalmology & Visual Science
|February 1, 1989
PubMed
Summary

Human lenses possess calpain II (an enzyme) and calpastatin (an inhibitor). Enzyme activity varies with age and location, potentially impacting lens maturation and cataract formation.

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Area of Science:

  • Ophthalmology
  • Biochemistry
  • Cell Biology

Background:

  • Calpains are calcium-dependent proteases implicated in cellular processes.
  • Understanding calpain activity in the human lens is crucial for eye health research.

Purpose of the Study:

  • To detect calpain II enzyme activity in human lenses.
  • To assess how aging and lens region affect calpain II activity.
  • To identify the presence and levels of calpastatin, a calpain inhibitor, in human lenses.

Main Methods:

  • Enzymatic assays were used to measure calpain II activity.
  • Immunologic assays confirmed the presence of calpain II.
  • Calpastatin activity was quantified.

Main Results:

  • Calpain II activity was detected in human lenses.
  • Activity was highest in the young donor cortex and lowest in aged donor nuclei.
  • Calpastatin was present in excess and did not decrease with age.

Conclusions:

  • Human lenses contain active calpain II and its inhibitor, calpastatin.
  • Calpain II activity changes with age and location within the lens.
  • Calpain II may play a role in human lens development and the pathogenesis of cataracts.

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