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阿波蛋白E (APOE) 变体影响阿尔茨海默氏症患者的粉样β (Aβ) 沉积率.

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科学领域:

  • 神经科学是一个神经科学.
  • 遗传学 是一个遗传学.
  • 生物化学 生物化学

背景情况:

  • 阿波蛋白E (APOE) 在阿尔茨海默病 (AD) 中的粉样β (Aβ) 纤维化和沉积中起着至关重要的作用.
  • 研究人类APOE等位基 (E2,E3,E4) 的不同amyloidogenic性质对于理解AD病变发生是必不可少的.
  • 了解APOE的作用,可以深入了解帕伦基马Aβ的沉积,进化和成熟.

研究的目的:

  • 调查人类三大APOE等位基因的相对粉原性质.
  • 检查APOE基因型对Aβ播种和沉积的影响.
  • 阐明APOE变异在确定阿尔茨海默氏病中Aβ相关表型中的作用.

主要方法:

  • 对人类APOE E2,E3和E4具有同胞性的hAbetaSAA小鼠的生成.
  • 在APPsi小鼠中注射AD脑溶解物的脑内注射,这些小鼠表达人类APOE E3或E4,以研究Aβ播种.
  • 使用免疫组织化学,免疫光和免疫阻塞进行神经病理学评估.

主要成果:

  • 表达APOE E4的hAbetaSAA小鼠在5个月大时,与APOE E3和E2相比,Aβ沉积显著增加.
  • 与表达APOEE3的小鼠相比,具有内源性小鼠Apoe的hAbetaSAA小鼠显示Aβ斑块沉积增加了约60倍.
  • 带有APOE E3或E4的APPsi小鼠在与AD脑溶解物播种时显示出相同的扩散性帕伦基马Aβ负担,在斑块形态上没有差异.

结论:

  • APOE变异在很大程度上影响了粉样蛋白沉积的速度,但不会改变沉积物形态或Aβ同位分.
  • 用AD患者的大脑溶解物播种在表达APOEE3和E4的APPsi小鼠之间Aβ负担没有显著差异.
  • 这项研究提供了关于APOE异型如何调节阿尔茨海默病中的Aβ相关表型的关键见解.