Abstract
The study aimed to investigate the role of NO and neuronal NO synthase (nNOS) in Zn-induced neurodegeneration. Animals were treated with zinc sulfate (20 mg/kg), twice a week, for 2–12 weeks along with control. In a few sets, animals were also treated with/without a NO donor, sodium nitroprusside (SNP), or S-nitroso-N-acetyl penicillamine (SNAP) for 12 weeks. Moreover, human neuroblastoma (SH-SY-5Y) cells were also employed to investigate the role of nNOS in Zn-induced toxicity in in vitro in the presence/absence of nNOS inhibitor, 7-nitroindazole (7-NI). Zn caused time-dependent reduction in nitrite content and total/nNOS activity/expression. SNP/SNAP discernibly alleviated Zn-induced neurobehavioral impairments, dopaminergic neurodegeneration, tyrosine hydroxylase (TH) expression, and striatal dopamine depletion. NO donors also salvage from Zn-induced increase in lipid peroxidation (LPO), mitochondrial cytochrome c release, and caspase-3 activation. While Zn elevated LPO content, it attenuated nitrite content, nNOS activity, and glutathione level along with the expression of TH and nNOS in SH-SY-5Y cells. 7-NI further augmented Zn-induced changes in the cell viability, oxidative stress, and expression of TH and nNOS. The results obtained thus demonstrate that Zn inhibits nNOS that partially contributes to an increase in oxidative stress, which subsequently leads to the nigrostriatal dopaminergic neurodegeneration.
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Acknowledgments
Authors sincerely thank University Grants Commission (UGC), New Delhi, India, for providing research fellowship to Brajesh Kumar, Ashutosh Kumar, and Deepali Singh. The Department of Biotechnology (DBT), New Delhi, India, is acknowledged for providing research fellowship to Vinod Kumar. The Council of Scientific and Industrial Research (CSIR), New Delhi, India, is greatly appreciated for extending the fellowship to Amit Kumar Chauhan and financial support to the study through networked program “Integrated NextGen Approaches in Health, Disease and Environmental Toxicity” [INDEPTH (BSC-0111)]. The IITR communication number of this article is 3370.
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The present study was approved by the institutional animal ethics committee, and the guidelines of the committee for the purpose of control and supervision of experiments on animals (CPCSEA) were stringently followed.
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Singh, B.K., Kumar, V., Chauhan, A.K. et al. Neuronal Nitric Oxide Synthase Negatively Regulates Zinc-Induced Nigrostriatal Dopaminergic Neurodegeneration. Mol Neurobiol 54, 2685–2696 (2017). https://doi.org/10.1007/s12035-016-9857-7
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DOI: https://doi.org/10.1007/s12035-016-9857-7