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Cholesterol and cataracts

R J Cenedella1

  • 1Department of Biochemistry, Kirksville College of Osteopathic Medicine, Missouri, USA.

Survey of Ophthalmology
|January 1, 1996
PubMed
Summary

Cholesterol metabolism defects and drugs inhibiting its synthesis can cause cataracts. The lens requires cholesterol synthesis for membrane integrity, and its impairment may lead to cataract formation.

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Area of Science:

  • Ophthalmology
  • Biochemistry
  • Genetics

Background:

  • Cataracts are linked to inherited cholesterol metabolism defects and drugs inhibiting lens cholesterol biosynthesis.
  • The lens relies on endogenous cholesterol synthesis for membrane structure, with its membrane having the highest cholesterol content known.
  • Genetic disorders like Smith-Lemli-Opitz syndrome, mevalonic aciduria, and cerebrotendinous xanthomatosis, affecting cholesterol metabolism, are associated with cataracts.

Purpose of the Study:

  • To explore the relationship between cholesterol metabolism, lens biosynthesis, and cataract development.
  • To assess the potential ocular risks associated with cholesterol biosynthesis inhibitors, particularly statins.
  • To evaluate the long-term safety of statins concerning human lens health.

Main Methods:

  • Review of existing literature on inherited cholesterol metabolism disorders and cataracts.
  • Analysis of animal models of drug-induced cataracts using cholesterol biosynthesis inhibitors.
  • Examination of clinical trial data regarding the ocular safety of statins.

Main Results:

  • Inhibiting cholesterol biosynthesis in animal models can induce cataracts.
  • Some statins inhibit cholesterol biosynthesis in animal lenses and have caused cataracts in dogs.
  • Short-term (1-5 years) clinical trials in older adults suggest high ocular safety for statins.

Conclusions:

  • Impaired lens cholesterol synthesis is a plausible mechanism for cataract formation.
  • The long-term ocular safety of statins, especially in younger individuals, requires further investigation due to the lens's continuous cholesterol needs.
  • Extended safety evaluations (10-20 years) may be necessary for statins, considering the lens's unique physiology.

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