Peripheral monocyte entry is required for alpha-Synuclein induced inflammation and Neurodegeneration in a model of Parkinson disease.

Peripheral monocyte entry is required for alpha-Synuclein induced inflammation and Neurodegeneration in a model of Parkinson disease.
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DOI:
10.1016/j.expneurol.2017.11.010
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发表时间:
2018-03
影响因子:
5.3
通讯作者:
Standaert DG
Standaert DG
中科院分区:
医学2区
文献类型:
--
作者:
Harms AS;Thome AD;Yan Z;Schonhoff AM;Williams GP;Li X;Liu Y;Qin H;Benveniste EN;Standaert DG

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α-突触核蛋白(α-syn)在中枢神经系统(CNS)中的蓄积是帕金森病(PD)的核心特征,其导致先天免疫系统激活、炎性细胞因子和趋化因子的产生以及随后的神经变性。在这里,我们使用杂合报告基因敲入小鼠,其中fractalkine受体(CX 3CR 1)和C-C趋化因子受体2型(CCR 2)的第一个外显子被荧光报告基因取代,以研究驻留小胶质细胞(CX 3CR 1+)和浸润性外周单核细胞(CCR 2+),分别在中枢神经系统中的作用。我们使用了由α-syn的病毒过表达诱导的α-syn小鼠模型。我们发现,在体内,全长人α-syn的表达诱导促炎性CCR 2+外周单核细胞向黑质的稳健浸润。CCR 2的基因缺失阻止α-syn诱导的单核细胞进入,减弱MHCII表达并阻断随后的多巴胺能神经元变性。这些结果表明,在PD突触核蛋白病的这种模型中,促炎性外周单核细胞外渗到CNS中在神经变性中起关键作用,并表明外周单核细胞可能是人PD的神经保护性治疗的靶点。
Accumulation of alpha-synuclein (α-syn) in the central nervous system (CNS) is a core feature of Parkinson disease (PD) that leads to activation of the innate immune system, production of inflammatory cytokines and chemokines, and subsequent neurodegeneration. Here, we used heterozygous reporter knock-in mice in which the first exons of the fractalkine receptor (CX3CR1) and of the C-C chemokine receptor type 2 (CCR2) are replaced with fluorescent reporters to study the role of resident microglia (CX3CR1+) and infiltrating peripheral monocytes (CCR2+), respectively, in the CNS. We used an α-syn mouse model induced by viral over-expression of α-syn. We find that in vivo, expression of full-length human α-syn induces robust infiltration of pro-inflammatory CCR2+ peripheral monocytes into the substantia nigra. Genetic deletion of CCR2 prevents α-syn induced monocyte entry, attenuates MHCII expression and blocks the subsequent degeneration of dopaminergic neurons. These results demonstrate that extravasation of pro-inflammatory peripheral monocytes into the CNS plays a key role in neurodegeneration in this model of PD synucleinopathy, and suggest that peripheral monocytes may be a target of neuroprotective therapies for human PD.
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