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• W2057451896 abstract "Abstract In several species, an acute injection of N ‐methyl‐ N ‐nitrosourea (MNU) induces a retinal degeneration characterized principally by a rapid loss of the outer nuclear layer, the other layers remaining structurally intact. It has, however, also been reported that down‐regulation of melanopsin gene expression is associated with the degeneration and is detectable soon after injection. Melanopsin is expressed by a small subset of intrinsically photosensitive retinal ganglion cells and plays an important role in circadian behaviour photoentrainment. We injected MNU into Long Evans rats and investigated the ability of animals to entrain to three light/dark cycles of different light intensities (300, 15 and 1 lux). Control animals entrained their locomotor activity rhythms to the three cycles. In contrast, MNU‐treated animals could only entrain properly to the 300 lux cycle. For the 15 lux cycle, their phase angle was much altered compared with control animals, and for the 1 lux cycle, MNU‐injected animals were unable to photoentrain and exhibited an apparent free‐run activity pattern with a period of 24.3 h. Subsequent to behavioural studies the animals were killed and rod, cone, melanopsin expression and melanopsin‐expressing cells were quantified. Rod and cone loss was almost complete, melanopsin protein was reduced by 83% and melanopsin‐expressing cells were reduced by 37%. Our study provides a comprehensive model of photoreceptor degeneration at the adult stage and a simple and versatile method to investigate the relation between retinal photoreceptors and the circadian system." @default.
• W2057451896 created "2016-06-24" @default.
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• W2057451896 date "2009-10-01" @default.
• W2057451896 modified "2023-10-16" @default.
• W2057451896 title "Loss of photic entrainment at low illuminances in rats with acute photoreceptor degeneration" @default.
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• W2057451896 doi "https://doi.org/10.1111/j.1460-9568.2009.06935.x" @default.
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