α-Synuclein Amyloids Hijack Prion Protein to Gain Cell Entry, Facilitate Cell-to-Cell Spreading and Block Prion Replication.

α-Synuclein Amyloids Hijack Prion Protein to Gain Cell Entry, Facilitate Cell-to-Cell Spreading and Block Prion Replication.
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α-突触核蛋白淀粉样蛋白劫持了prion蛋白以获得细胞的进入,促进细胞到细胞扩散并阻止prion复制。

DOI:
10.1038/s41598-017-10236-x
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发表时间:
2017-08-30
期刊:
影响因子:
4.6
通讯作者:
Legname G
Legname G
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Aulić S;Masperone L;Narkiewicz J;Isopi E;Bistaffa E;Ambrosetti E;Pastore B;De Cecco E;Scaini D;Zago P;Moda F;Tagliavini F;Legname G

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错误折叠的 α-突触核蛋白 (α-Syn) 在突触核蛋白病中如何积累和扩散的精确分子机制仍不清楚。在这里,我们展示了细胞朊病毒蛋白 (PrPC) 在介导重组 α-Syn 淀粉样蛋白的摄取和扩散中的作用。体外数据显示,PrPC 的存在促进了 α-Syn 淀粉样原纤维的更高摄取,与 PrP 敲除小鼠 (Prnp −/−) 相比,野生型 (Prnp +/+) 小鼠体内也证实了这一点。此外,α-Syn 淀粉样蛋白的存在阻断了痒病朊病毒 (PrPSc) 的体外和离体复制,表明这两种蛋白质之间存在联系。事实上,虽然 PrPC 介导 α-Syn 淀粉样蛋白的内化,但 PrPSc 在它们存在的情况下无法复制。这一观察结果具有病理相关性,因为一些报道的案例研究表明,克雅氏病患者中 α-Syn 淀粉样蛋白沉积物的积累伴随着更长的病程。
The precise molecular mechanism of how misfolded α-synuclein (α-Syn) accumulates and spreads in synucleinopathies is still unknown. Here, we show the role of the cellular prion protein (PrPC) in mediating the uptake and the spread of recombinant α-Syn amyloids. The in vitro data revealed that the presence of PrPC fosters the higher uptake of α-Syn amyloid fibrils, which was also confirmed in vivo in wild type (Prnp +/+) compared to PrP knock-out (Prnp −/−) mice. Additionally, the presence of α-Syn amyloids blocked the replication of scrapie prions (PrPSc) in vitro and ex vivo, indicating a link between the two proteins. Indeed, whilst PrPC is mediating the internalization of α-Syn amyloids, PrPSc is not able to replicate in their presence. This observation has pathological relevance, since several reported case studies show that the accumulation of α-Syn amyloid deposits in Creutzfeldt-Jakob disease patients is accompanied by a longer disease course.
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