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Prevention of selenite-induced cataractogenesis by N-acetylcysteine in rats
Bahri Aydin1, Ramazan Yagci, Fatma M Yilmaz
1Ophthalmology Department, Fatih University School of Medicine, Ankara, Turkey. baydunus@yahoo.com
Insights
N-acetylcysteine (NAC) effectively reduced selenite-induced cataracts in rats by preventing oxidative damage. This study highlights NAC
Area of Science:
- Ophthalmology
- Toxicology
- Biochemistry
Background:
- Cataracts are a leading cause of blindness globally.
- Selenite-induced cataracts in animal models offer insights into oxidative stress mechanisms in lens opacity.
- N-acetylcysteine (NAC) is an antioxidant precursor to glutathione.
Purpose of the Study:
- To investigate the protective effects of N-acetylcysteine against selenite-induced cataract formation in a rat model.
- To assess the impact of NAC on oxidative stress markers in selenite-induced cataracts.
Main Methods:
- Thirty-four Sprague-Dawley rat pups were used, divided into three groups: selenite-only, selenite plus NAC, and saline control.
- Cataract formation was monitored daily.
- Glutathione, malondialdehyde, and protein carbonyl levels were measured in serum and lens tissues.
Main Results:
- Rats treated with selenite alone showed a high incidence of cataracts (100%), while NAC co-administration significantly reduced cataract development (25.7% incidence).
- Selenite exposure led to decreased glutathione and increased malondialdehyde and protein carbonyl levels in the lens and serum.
- NAC treatment normalized these oxidative stress markers.
Conclusions:
- N-acetylcysteine demonstrates significant potential in inhibiting selenite-induced cataractogenesis in rats.
- The protective mechanism of NAC involves the mitigation of oxidative damage.
- NAC may be a viable therapeutic agent for preventing certain types of cataracts.
Purpose:
To evaluate the effect of N-acetylcysteine on selenite-induced cataract formation in a rat model.
Materials And Methods:
Thirty-four Sprague-Dawley rat pups were divided into three groups. Eight pups received only selenite on postpartum day 10 (group 1), 14 pups received selenite on day 10 and additional acetylcysteine on postnatal days 9 to 15 (group 2), and 12 pups received only saline (group 3, control). All pups were daily examined for the presence of cataract under the microscope, starting from the day their eyes opened. Glutathione and malondialdehyde levels were evaluated in both serum and lenticular samples while protein carbonyl level was studied only in lenticular samples.
Results:
In group 1, 50% of the rats developed dense nuclear opacities and 50% developed slight nuclear opacities, while in group 2 only 14.3% developed dense nuclear opacities and 21.4% developed slight nuclear opacities (p < 0.05). None of the rats in group 3 developed any lens opacity. In lenticular samples, mean glutathione level was statistically lower in group 1 compared to groups 2 and 3 (p < 0.05), while malondialdehyde and protein carbonyl levels were both statistically higher in group 1 compared to groups 2 and 3 (p < 0.05). Serum level of glutathione was statistically lower in group 1 compared to groups 2 and 3 (p < 0.05), while serum malondialdehyde level was statistically lower in group 3 compared to groups 1 and 2.
Conclusions:
N-acetylcysteine appears to inhibit selenite-induced cataractogenesis in the rat model, and this seems to be caused by the prevention of oxidative damage.
