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• W2883197717 abstract "Environmental toxicant exposure has been strongly implicated in the pathogenesis of Parkinson's disease (PD). Clinical manifestations of non-motor and motor symptoms in PD stem from decades of progressive neurodegeneration selectively afflicting discrete neuronal populations along a caudo-rostral axis. However, recapitulating this spatiotemporal neurodegenerative pattern in rodents has been unsuccessful. The purpose of this study was to generate such animal PD models and delineate mechanism underlying the ascending neurodegeneration. Neuroinflammation, oxidative stress, and neuronal death in mice brains were measured at different times following a single systemic injection of lipopolysaccharide (LPS). We demonstrate that LPS produced an ascending neurodegeneration that temporally afflicted neurons initially in the locus coeruleus (LC), followed by substantia nigra, and lastly the primary motor cortex and hippocampus. To test the hypothesis that LPS-elicited early loss of noradrenergic LC neurons may underlie this ascending pattern, we used a neurotoxin N-(2-chloroethyl)-N-ethyl-2-bromobenzylamine (DSP-4) to deplete brain norepinephrine. DSP-4 injection resulted in a time-dependent ascending degenerative pattern similar to that generated by the LPS model. Mechanistic studies revealed that increase in nicotinamide adenine dinucleotide phosphate (NADPH) oxidase-2 (NOX2)-dependent superoxide/reactive oxygen species (ROS) production plays a key role in both LPS- and DSP-4-elicited neurotoxicity. We found that toxin-elicited chronic neuroinflammation, oxidative neuronal injuries, and neurodegeneration were greatly suppressed in mice deficient in NOX2 gene or treated with NOX2-specific inhibitor. Our studies document the first rodent PD model recapturing the ascending neurodegenerative pattern of PD patients and provide convincing evidence that the loss of brain norepinephrine is critical in initiating and maintaining chronic neuroinflammation and the discrete neurodegeneration in PD." @default.
• W2883197717 created "2018-08-03" @default.
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• W2883197717 date "2018-07-27" @default.
• W2883197717 modified "2023-10-18" @default.
• W2883197717 title "Loss of Brain Norepinephrine Elicits Neuroinflammation-Mediated Oxidative Injury and Selective Caudo-Rostral Neurodegeneration" @default.
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• W2883197717 doi "https://doi.org/10.1007/s12035-018-1235-1" @default.
• W2883197717 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6348128" @default.
• W2883197717 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30051353" @default.
• W2883197717 hasPublicationYear "2018" @default.
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