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第 35 章 朊粒( prion )

第 35 章 朊粒( prion ). Prion. 本质 :传染性蛋白因子,主要成分是一种 蛋白酶抗性蛋白( PrP ) 生物学特性 : 可滤过性,增殖非常缓慢; slow virus 与已知病毒特征明显不同; unconventional virus 不具有病毒结构, 未检出核酸 ; 对福尔马林、蛋白酶、加热、电离辐射、紫外 线抵抗力强;. β 折叠. PrP C (正常). PrP SC (致病). 羊瘙痒病 PrP C 与 PrP SC 的三维结构. 致病性:. 震颤病或库鲁( Kuru )病

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第 35 章 朊粒( prion )

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  1. 第35章 朊粒(prion)

  2. Prion • 本质:传染性蛋白因子,主要成分是一种 • 蛋白酶抗性蛋白(PrP) • 生物学特性: • 可滤过性,增殖非常缓慢;slow virus • 与已知病毒特征明显不同;unconventional virus • 不具有病毒结构,未检出核酸; • 对福尔马林、蛋白酶、加热、电离辐射、紫外 • 线抵抗力强;

  3. β折叠 PrPC(正常) PrPSC(致病) 羊瘙痒病PrPC与PrPSC的三维结构

  4. 致病性: • 震颤病或库鲁(Kuru)病 • 克-雅病(CJD)或克-雅病变种(Variant CJD) • Gerstmann-Straussler综合征 • 致死性家族失眠症 • 羊瘙痒病 • 牛海绵脑病(疯牛病) • 传染性雪貂白质脑病 • 大耳鹿慢性消耗病

  5. prion病共同特征: 潜伏期长,以海绵状脑病(TSE)为特征的,致死性中枢神经系统的慢性退化性疾患 病理学特点: 大脑皮质神经元退化,空泡变性,形成淀粉样斑块,星状细胞增生,成为海绵样脑病或白质脑病

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