Artificial strain of human prions created in vitro.

Artificial strain of human prions created in vitro.
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DOI:
10.1038/s41467-018-04584-z
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发表时间:
2018-06-04
影响因子:
16.6
通讯作者:
Safar JG
Safar JG
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Kim C;Xiao X;Chen S;Haldiman T;Smirnovas V;Kofskey D;Warren M;Surewicz K;Maurer NR;Kong Q;Surewicz W;Safar JG

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在生理条件下决定最常见的人类朊病毒病,散发性克雅氏病(sCJD)的分子机制是未知的。我们报告了新的人朊病毒的合成重组人朊病毒蛋白表达的细菌中接种的sCJD MM 1朊病毒和辅因子,神经节苷脂GM 1的反应。这些合成的人朊病毒对表达非糖基化人朊病毒蛋白的转基因小鼠具有感染性,在第一次和第二次传代中分别在459天和224天后引起神经功能障碍。神经病理学,复制能力,和生物物理分析表明,一种新的,特别是神经毒性的人朊病毒株。我们的合成人朊病毒的独特的生物学和结构特征表明,关键结构域的结构组织的微妙变化,一些与致病性朊病毒蛋白(PrPSc)的翻译后修饰有关,在小鼠模型中作为人朊病毒感染性,宿主范围和特定脑结构靶向的决定因素发挥着至关重要的作用。合成朊病毒先前已从重组啮齿动物PrP产生。在这里,作者通过将人类PrP与CJD朊病毒接种来合成人类朊病毒,并描述其在小鼠中的感染性。
The molecular mechanism that determines under physiological conditions transmissibility of the most common human prion disease, sporadic Creutzfeldt-Jakob disease (sCJD) is unknown. We report the synthesis of new human prion from the recombinant human prion protein expressed in bacteria in reaction seeded with sCJD MM1 prions and cofactor, ganglioside GM1. These synthetic human prions were infectious to transgenic mice expressing non-glycosylated human prion protein, causing neurologic dysfunction after 459 and 224 days in the first and second passage, respectively. The neuropathology, replication potency, and biophysical profiling suggest that a novel, particularly neurotoxic human prion strain was created. Distinct biological and structural characteristics of our synthetic human prions suggest that subtle changes in the structural organization of critical domains, some linked to posttranslational modifications of the pathogenic prion protein (PrPSc), play a crucial role as a determinant of human prion infectivity, host range, and targetting of specific brain structures in mice models. Synthetic prions have previously been generated from recombinant rodent PrP. Here the authors generate synthetic human prions, by seeding human PrP with CJD prions, and characterize its infectivity in mice.
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