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- W1998923564 abstract "Abstract Treatment of neonatal rats with U18666A, an inhibitor of desmosterol Δ 24 ‐reductase, results in accumulation of desmosterol (Δ 5,24 ) and depletion of cholesterol (Δ 5 ) in various bodily tissues and also causes cataracts. We evaluated the effects of U18666A on the sterol composition, de novo sterol synthesis, and histological structure of the retina. Neonatal Sprague‐Dawley rats were injected subcutaneously with U18666A (15 mg/kg, in olive oil) every other day from birth through 3 wk of age; in parallel, control rats received olive oil alone. At 21 d, treated and control groups each were subdivided into two groups: one group of each was injected intravitreally with [ 3 H]acetate; retinas were removed 20 h later and non‐saponifiable lipids (NSL) were analyzed by radio‐high‐performance liquid chromatography. The other group was injected intravitreally with [ 3 H]leucine; 4 d later, one eye of each animal was evaluated by light and electron microscopy and light microscopic autoradiography, while contralateral retinas and rod outer segment (ROS) membranes prepared thereform were analyzed by sodium dodecyl sulfate‐polyacrylamide gel electrophoresis/fluorography. In the treated group, the Δ 5 /Δ 5,24 mole ratio of retinas was ca. 1.0, and >88% of the NSL radioactivity was in Δ 5,24 ; in contrast, control retinas had Δ 5 /Δ 5,24 >170, with >80% of the NSL radioactivity in Δ 5 . Retinal histology, ultrastructure, ROS renewal rates, and rhodopsin synthesis and intracellular trafficking were comparable in both treated and control animals. These results suggest that desmosterol can either substitute functionally for cholesterol in the retina or it can complement subthreshold levels of cholesterol by sterol synergism." @default.
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- W1998923564 date "2000-03-01" @default.
- W1998923564 modified "2023-10-07" @default.
- W1998923564 title "Cholesterol synthesis in the vertebrate retina: Effects of U18666A on rat retinal structure, photoreceptor membrane assembly, and sterol metabolism and composition" @default.
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- W1998923564 doi "https://doi.org/10.1007/s11745-000-0525-y" @default.
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