Journal
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
Volume 50, Issue 6, Pages 2777-2784Publisher
ASSOC RESEARCH VISION OPHTHALMOLOGY INC
DOI: 10.1167/iovs.08-3061
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology of Japan (Mext) [13218132, 17590257, 20592067]
- Grants-in-Aid for Scientific Research [17590257, 20592067, 13218132] Funding Source: KAKEN
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PURPOSE. Oxidative stress plays an important role in pathogenesis of glaucoma. The purpose of this study is to investigate the novel effect of antiglaucoma drugs on the expression of antioxidant peroxiredoxins of trabecular meshwork (TM) cells. METHODS. The expression of the peroxiredoxin family was investigated using immortalized TM cell lines. Cells were treated with antiglaucoma drugs and analyzed for the expression of peroxiredoxin, and cellular sensitivity to oxidative stress. Furthermore, the effect of antiglaucoma drugs on the molecular regulation of the expression of peroxiredoxin was examined using a reporter assay and siRNA strategy. RESULTS. Glaucomatous TM cells highly express peroxiredoxin 2 when compared with normal TM cells. Nipradilol and timolol, but not latanoprost, induce the expression of peroxiredoxin 2 through the activation of the Foxo3a transcription factor. TM cells showed reduced sensitivity to H2O2 when cells were treated with either nipradilol or timolol, but not with latanoprost. In addition, both Foxo3a and PRDX2 expression were enhanced by drug-induced signal transduction through its receptor. CONCLUSIONS. These results indicate that both nipradilol and timolol possess a novel mechanism of action and function as potent protective agents against oxidative stress. (Invest Ophthalmol Vis Sci. 2009; 50: 2777-2784) DOI: 10.1167/iovs.083061
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