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Taurine protects noradrenergic locus coeruleus neurons in a mouse Parkinson’s disease model by inhibiting microglial M1 polarization

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A Correction to this article was published on 13 February 2021

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Abstract

Beyond nigrostriatal dopaminergic system, the noradrenergic locus coeruleus (LC/NE) neurons are also degenerated in patients with Parkinson’s disease (PD), the second most common neurodegenerative disorder. We previously reported that microglia-mediated neuroinflammation contributes to LC/NE neurodegeneration. The purpose of this study is aimed to test whether taurine, an endogenous amino acid, could be able to protect LC/NE neurons through inhibition of microglial activation using paraquat and maneb-induced mouse PD model. Taurine (150 mg/kg) was administrated (i.p) to mice 30 min prior to paraquat (10 mg/kg) and maneb (30 mg/kg) intoxication for consecutive 6 weeks (twice per week). The results clearly demonstrated that paraquat and maneb co-exposure resulted in loss of tyrosine hydroxylase-positive neurons in the LC in mice, which was significantly ameliorated by taurine. Mechanistically, inhibition of microglia-mediated neuroinflammation contributed to taurine-afforded neuroprotection. Taurine attenuated paraquat and maneb-induced microglial activation and M1 polarization as well as release of proinflammatory cytokines in brainstem of mice. Taurine also abrogated microglial NADPH oxidase activation and oxidative damage in paraquat and maneb-treated mice. Furthermore, inhibition of nuclear factor-κB (NF-κB) but not signal transducers and activators of transcription 1/3 (STAT1/3) signaling pathway participated in taurine-inhibited microglial activation. Collectively, taurine exerted LC/NE neuroprotection against microglia-mediated neurotoxicity. The robust neuroprotective effects of taurine suggest that taurine may be a promising candidate for potential therapy for patients suffering from PD.

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Acknowledgements

This work was supported by “QiZhen” Talent Project of Dalian Medical University (No. 201122), Liaoning BaiQianWan Talents Program (No. [2017]90) and Program for Liaoning Innovative Talents in University.

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Correspondence to Qingshan Wang.

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The authors declare no conflict of interest.

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All animal procedures and their care were carried out in accordance the National Institute of Health Guide for the Care and Use of Laboratory Animals and were approved by the Institutional Animal Care and Use Committee of Dalian Medical University.

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Handling Editor: T. Harkany.

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Hou, L., Che, Y., Sun, F. et al. Taurine protects noradrenergic locus coeruleus neurons in a mouse Parkinson’s disease model by inhibiting microglial M1 polarization. Amino Acids 50, 547–556 (2018). https://doi.org/10.1007/s00726-018-2547-1

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  • DOI: https://doi.org/10.1007/s00726-018-2547-1

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