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- W2043391234 abstract "The purpose of the present study was to investigate the in vivo dose response function for UVR 300 nm-induced cataract in the C57BL/6J mouse lens and to establish a cataract threshold estimate expressed as Maximum Tolerable Dose (MTD(2.3:16)) for UVR 300 nm-induced cataract in the C57BL/6J mouse lens. Knowledge of the MTD(2.3:16) in the C57BL/6J mouse will permit quantitative in vivo comparison of UVR-B threshold sensitivity of knockout mice, e.g. animals deficient in key antioxidative enzymes or mice suffering from genetically predetermined eye disease, to wild type animals. Eighty C57BL/6J mice were divided into four dose groups. The animals were exposed unilaterally to 0, 2, 4, or 8 kJ/m(2) UVR 300 nm for 15 min (n=20). The radiation output of the UVR-source had lambda(max) at 302.6 nm with 5 nm full width at half maximum. Two days after exposure cataract was quantified as forward lens light scattering intensity in the exposed and the contralateral non-exposed lens. Morphological lens changes were documented using grid and dark field illumination photography. MTD(2.3:16) was estimated from the forward light scattering measurements. Two days after exposure mainly anterior subcapsular but also cortical and nuclear cataract developed in lenses that had received 2, 4, and 8 kJ/m(2) UVR 300 nm. Forward light scattering intensity increased with increasing UVR 300 nm dose. MTD(2.3:16) for the mouse lens was estimated to 2.9 kJ/m(2) UVR 300 nm. Lens light scattering intensity in the C57BL/6J mouse lens increases with UVR 300 nm in vivo dose in the range 0-8 kJ/m(2). The MTD(2.3:16) of 2.9 kJ/m(2) in the C57BL/6J mouse lens determined here, is essential to quantify and compare in vivo the impact of genetic modulation on lens susceptibility to oxidative stress and plan dose-ranges in future investigations of UVR 300 nm-induced cataract pathogenesis." @default.
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- W2043391234 date "2008-02-01" @default.
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- W2043391234 title "Dose dependent cataractogenesis and Maximum Tolerable Dose (MTD2.3:16) for UVR 300nm-induced cataract in C57BL/6J mice" @default.
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