期刊
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
卷 53, 期 7, 页码 3349-3356出版社
ASSOC RESEARCH VISION OPHTHALMOLOGY INC
DOI: 10.1167/iovs.12-9851
关键词
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资金
- Knights Templar Eye Foundation, Inc., Flower Mound, Texas
- E. Matilda Ziegler Foundation for the Blind, Inc., Darien, Connecticut
- Research to Prevent Blindness, Inc., New York, New York
- NIH [EY08123, EY019298, EY014800-039003]
- Foundation Fighting Blindness, Inc., Columbia, Maryland
PURPOSE. Mutations in either retinoid isomerase (RPE65) or lecithin-retinol acyltransferase (LRAT) lead to Leber congenital amaurosis (LCA). By using the Lrat(-/-) mouse model, previous studies have shown that the rapid cone degeneration in LCA was caused by endoplasmic reticulum (ER) stress induced by S-opsin aggregation. The purpose of this study is to examine the efficacy of an ER chemical chaperone, tauroursodeoxycholic acid (TUDCA), in preserving cones in the Lrat(-/-) model. METHODS. Lrat(-/-) mice were systemically administered with TUDCA and vehicle (0.15 M NaHCO3) every 3 days from P9 to P28. Cone cell survival was determined by counting cone cells on flat-mounted retinas. The expression and subcellular localization of cone-specific proteins were analyzed by western blotting and immunohistochemistry, respectively. RESULTS. TUDCA treatment reduced ER stress and apoptosis in Lrat(-/-) retina. It significantly slowed down cone degeneration in Lrat(-/-) mice, resulting in a similar to 3-fold increase in cone density in the ventral and central retina as compared with the vehicle-treated mice at P28. Furthermore, TUDCA promoted the degradation of cone membrane-associated proteins by enhancing the ER-associated protein degradation pathway. CONCLUSIONS. Systemic injection of TUDCA is effective in reducing ER stress, preventing apoptosis, and preserving cones in Lrat(-/-) mice. TUDCA has the potential to lead to the development of a new class of therapeutic drugs for treating LCA. (Invest Ophthalmol Vis Sci. 2012;53:3349-3356) DOI:10.1167/iovs.12-9851
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