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Effects of Melatonin on Streptozotocin-Induced Retina Neuronal Apoptosis in High Blood Glucose Rat

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Abstract

One of the main pathological symptoms of early diabetic retinal neuropathy is retina neuronal apoptosis. In the present work we investigated the effects of indoleamine hormone melatonin, a powerful free radical scavenger, on streptozotocin-induced retina neuronal cell apoptosis in high blood glucose rat. After melatonin treatment (10 mg/kg/day), tunel detection was used to monitor the apoptosis rate of neurons in the retinal ganglion cell layer; reversed quantitative PCR was used to measure the mRNA expression of retinal caspase-3, Mn superoxidase dismutase (SOD) and Cu–Zn SOD; and the activities of total SOD (T-SOD) and sub-type SOD was detected using xanthine oxidase enzymatic detection. Our data showed that melatonin treatment leads to a decrease of retinal cell apoptosis and the apoptotic index was (1.67 ± 0.54) % and (7.73 ± 0.95) % at 8 and 12 weeks after treatment. The relative quantitative (RQ) value for caspase-3 mRNA expression was (6.996 ± 1.192) and (7.267 ± 1.178) in melatonin group, which are much lower than the values of diabetic group (12.566 ± 2.272 and (14.297 ± 2.110) at 8 and 12 weeks, respectively) under the same condition. mRNA expression of Mn SOD and Cu–Zn SOD as well as their activities all decreased in the diabetic group compared with the control group. While melatonin treatment induced the expression of Mn SOD mRNA and a continual increase of Mn SOD activity as well as the activity and mRNA expression of Cu–Zn SOD at 12 weeks. Therefore, our results demonstrate that melatonin treatment prevented the decrease in mRNA expression of SOD and the increase in caspase-3 mRNA expression induced by diabetes thus exerts a beneficial effect on retina neuronal apoptosis.

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Authors and Affiliations

  1. Department of Ophthalmology, The First Hospital Affiliated to PLA General Hospital, Fucheng Road 51, Haidian District, Beijing, 100048, People’s Republic of China

    Xiaoyan Li & Weiqiang Tang

  2. Department of Ophthalmology, The PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, People’s Republic of China

    Maonian Zhang

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  1. Xiaoyan Li
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  2. Maonian Zhang
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Correspondence to Maonian Zhang.

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Li, X., Zhang, M. & Tang, W. Effects of Melatonin on Streptozotocin-Induced Retina Neuronal Apoptosis in High Blood Glucose Rat. Neurochem Res 38, 669–676 (2013). https://doi.org/10.1007/s11064-012-0966-z

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  • DOI: https://doi.org/10.1007/s11064-012-0966-z

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