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UNALTERED SUSCEPTIBILITY TO BSE IN TRANSGENIC MICE EXPRESSING HUMAN PRION PROTEIN

机译:表达人类PR蛋白的转基因小鼠对BSE的敏感性

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PRION diseases are transmissible neurodegenerative conditions of humans and animals. Prions consist principally of a post-translationally modified form of prion protein (PrP), PrPSc, which is partly protease resistant(1). Transmission of prion diseases between species is limited by a 'species barrier'(2) determined in part by the degree of sequence homology between host PrP and inoculated PrPSc (ref.3) and by prion strain type(4). The epidemic of bovine spongiform encephalopathy (BSE) in the United Kingdom and other countries has led to concerns that transmission to humans may occur by dietary exposure. BSE appears to be caused by a single strain, distinct from those of natural or experimental scrapie(4), which is also seen in the nerv prion diseases of cats and ruminants that have presumably arisen from dietary BSE exposure(4). Here we show that transgenic mice expressing human PrP in addition to mouse PrP can generate human PrPSc and 'human' prions. These mice therefore provide a model to study experimentally the species barrier limiting BSE transmission to humans. Incubation periods to BSE in transgenic mice are not shortened by expression of human PrP, and only mouse PrPSc is produced in response to such challenge.
机译:PRION疾病是人类和动物可传播的神经退行性疾病。 ions病毒主要由蛋白(PrP)的翻译后修饰形式组成,PrPSc部分具有蛋白酶抗性(1)。 species病毒疾病在物种间的传播受到“物种屏障”的限制(2),该屏障部分取决于宿主PrP和接种的PrPSc之间的序列同源性程度(参考文献3)和病毒菌株类型(4)。在英国和其他国家,牛海绵状脑病(BSE)的流行引起了人们的关注,即饮食接触可能会传染给人类。疯牛病似乎是由单一菌株引起的,与自然或实验性瘙痒病不同(4),这在猫和反刍动物的神经病毒疾病中也可能见到,大概是由于饮食中疯牛病引起的(4)。在这里,我们显示了表达除小鼠PrP之外的人PrP的转基因小鼠可以产生人PrPSc和“人” pr病毒。因此,这些小鼠提供了一个模型,用于实验研究限制BSE向人类传播的物种屏障。通过表达人类PrP不会缩短转基因小鼠中BSE的潜伏期,并且只有小鼠PrPSc才能响应这种挑战。

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