Pathological α-synuclein transmission initiates Parkinson-like neurodegeneration in nontransgenic mice.

Pathological α-synuclein transmission initiates Parkinson-like neurodegeneration in nontransgenic mice.
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DOI:
10.1126/science.1227157
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发表时间:
2012-11-16
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Lee VM
Lee VM
中科院分区:
其他
文献类型:
--
作者:
Luk KC;Kehm V;Carroll J;Zhang B;O'Brien P;Trojanowski JQ;Lee VM

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帕金森病的特征是大量的α-突触核蛋白(α-Syn)神经元包涵体,称为路易体和路易神经突,以及中脑多巴胺神经元的大量丢失。然而,Lewy包涵体形成和神经退行性变之间的因果关系仍不清楚。我们发现,在野生型非转基因小鼠中,单一纹状体内接种合成α-Syn纤维导致病理性α-Syn和帕金森氏病样Lewy病理在解剖学上相互连接的区域中的细胞间传播。Lewy病理学蓄积导致黑质腹侧被盖区多巴胺神经元进行性丢失,但邻近腹侧被盖区未发生,并伴有多巴胺水平降低,最终导致运动缺陷。因此,神经退行性级联反应的重现建立了病理性α-Syn传递与帕金森病主要特征之间的机制联系。
Parkinson’s disease is characterized by abundant α-Synuclein (α-Syn) neuronal inclusions known as Lewy-bodies and Lewy-neurites, and the massive loss of midbrain dopamine neurons. However, a cause-and-effect relationship between Lewy inclusion formation and neurodegeneration remains unclear. Here we found that in wildtype non-transgenic mice a single intrastriatal inoculation of synthetic α-Syn fibrils led to the cell-to-cell transmission of pathologic α-Syn and Parkinson’s-like Lewy pathology in anatomically interconnected regions. Lewy pathology accumulation resulted in progressive loss of dopamine neurons in the substantia nigra pars compacta, but not in the adjacent ventral tegmental area, and was accompanied by reduced dopamine levels culminating in motor deficits. This recapitulation of a neurodegenerative cascade thus establishes a mechanistic link between transmission of pathologic α-Syn and the cardinal features of Parkinson’s disease.
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