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  • Title: Cysteamine prevents the development of lens opacity in a rat model of selenite-induced cataract.
    Author: Lee SM, Jeong EM, Jeong J, Shin DM, Lee HJ, Kim HJ, Lim J, Lee JH, Cho SY, Kim MK, Wee WR, Lee JH, Kim IG.
    Journal: Invest Ophthalmol Vis Sci; 2012 Mar 15; 53(3):1452-9. PubMed ID: 22281827.
    Abstract:
    PURPOSE: The activation of transglutaminase 2 (TG2) by oxidative stress through TGFβ has been reported to play a crucial role in cataract formation. The authors investigated whether TG2 is involved in selenite-induced cataract formation in rats and whether cysteamine, a chemical inhibitor of TG2, can prevent cataract formation in this model. METHODS: Intracellular TG2 activity was monitored in a human lens epithelial cell (HLE-B3) line and cultured rat lenses after treatment with selenite. Rat pups (13 days old) were injected subcutaneously with sodium selenite (Na(2)SeO(3); 20 μmol/kg) and intraperitoneally with cysteamine (30, 40, and 60 mg/kg) for 14 days. Lenses were evaluated photographically at days 7 and 14. The concentrations of malondialdehyde and glutathione in the lenses were determined. RESULTS: In HLE-B3 cells or rat lenses, selenite induced intracellular TG activity, which was inhibited by cysteamine. In selenite-treated rats, the rate of cataract formation was significantly reduced by cysteamine (P < 0.001). The mean cataract area in the lenses of cysteamine-treated rats was smaller than that of control rats (P < 0.01). The levels of total and reduced glutathione in the lenses of cysteamine-treated rats extracted at day 14 were higher than those of control rats. CONCLUSIONS: Cysteamine suppresses cataract formation induced by selenite in rats, suggesting that cysteamine can be used as a pharmaceutical intervention to prevent or delay cataract formation.
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