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Cysteamine induces cataracts in newborn rats
T Truong1, S M Sagar, W J Millard
1Neurology Service, VA Medical Center, San Francisco, California 94121.
Insights
Daily cysteamine injections in neonatal rats permanently induce cataracts. This protein cross-linking mechanism may offer insights into human senile cataract formation, aiding research models.
Area of Science:
- Ophthalmology
- Toxicology
- Biochemistry
Background:
- Cysteamine (CSH) is known to induce protein cross-linking via abnormal disulfide bonds.
- Neonatal rat models are utilized in toxicological and ophthalmological research.
Purpose of the Study:
- To investigate the cataractogenic effects of daily cysteamine injections in neonatal rats.
- To explore the potential of cysteamine as a model for human senile cataract formation.
Main Methods:
- Neonatal rats received daily subcutaneous injections of cysteamine.
- Observations were made from eye opening through permanent cataract development.
Main Results:
- Daily cysteamine administration resulted in dense, bilateral, and permanent cataracts.
- Cataracts were evident in the rats upon eye opening.
Conclusions:
- Cysteamine induces permanent cataracts in neonatal rats through protein cross-linking.
- This animal model may be valuable for studying the mechanisms of human senile cataracts.
Abstract:
Daily subcutaneous injections of cysteamine (CSH) administered to neonatal rats for 6 to 11 days cause dense bilateral cataracts that are evident at eye opening and that are permanent. CSH has been previously shown to induce protein cross-linking by the formation of abnormal disulfide bonds. It is hypothesized that the same mechanism underlies its cataractogenic effect; as such, CSH may be a useful agent in the study of models of senile cataract formation in humans.