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- W19595993 abstract "A single injection of 20 mumol sodium selenite/kg body weight in 10-day-old rats caused severe nuclear cataract within 4 days. By 4 days postselenite injection, nuclear calcium levels increased from 0.4 to 6.8 mmol/kg lens dry weight. The purpose of these experiments was to determine if this calcium increase was associated with proteolysis specifically in the lens nuclear region. Sodium dodecyl sulfate polyacrylamide electrophoresis of lens nuclear proteins following selenite injection showed: loss of 30, 27, and 26 K molecular weight polypeptides in the soluble fraction, loss of 83, 52, 30, 27, and 26 K polypeptides in the insoluble fraction, and loss of the major 26 K membrane protein. Gel chromatography of nuclear soluble proteins indicated a decrease in beta H and beta L crystallins following selenite injection. Two-hour in vitro incubation of nuclear lens homogenates with calcium duplicated many of the proteolytic changes occurring in lenses in vivo following selenite injection. Calcium induced proteolysis in vitro was inhibited by EGTA, leupeptin, and iodoacetate but was not inhibited by phenylmethylsulfonyl fluoride. These properties are similar to calcium activated protease (CAP) from other tissues. Activation of CAP, and subsequent degradation of nuclear proteins, may be causes of selenite cataract." @default.
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- W19595993 date "1984-11-01" @default.
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- W19595993 title "Calcium-activated proteolysis in the lens nucleus during selenite cataractogenesis." @default.
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