中国神经再生研究(英文版) ›› 2022, Vol. 17 ›› Issue (10): 2286-2292.doi: 10.4103/1673-5374.336872

• 原著:退行性病与再生 • 上一篇    下一篇

淀粉样β蛋白和Tau毒性在果蝇模型中的相互增强

  

  • 出版日期:2022-10-15 发布日期:2022-03-16
  • 基金资助:
    国家自然科学基金和中科院战略先导专项及国科大杭州高等研究院启动经费

Toxicities of amyloid-beta and tau protein are reciprocally enhanced in the Drosophila model

Zhen-Dong Sun1, Jia-Xin Hu1, Jia-Rui Wu1, Bing Zhou2, Yun-Peng Huang1   

  1. 1Key Laboratory of Systems Health Science of Zhejiang Province, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, Zhejiang Province, China; 2State Key Laboratory of Membrane Biology, School of Life Sciences, Tsinghua University, Beijing, China
  • Online:2022-10-15 Published:2022-03-16
  • Contact: Yun-Peng Huang, PhD, huangyp@ucas.ac.cn; Bing Zhou, PhD, zhoubing@mail.tsinghua.edu.cn; Jia-Rui Wu, PhD, wujr@sibs.ac.cn.
  • Supported by:
    This study was supported by the National Basic Research Program of China, Nos. 31700883 (to YPH) and 91649118 (to BZ), China Postdoctoral Science Foundation, No. 2015M581072 (to YPH), and the Strategic Priority Research Program of the Chinese Academy of Sciences, No. XDB38000000 (to JRW).

摘要:

淀粉样β蛋白的细胞外聚集和细胞内Tau缠结是阿尔茨海默病的两个主要致病标志和关键因素。淀粉样β蛋白和Tau之间的线性相互作用已在多个模型中得到证实:淀粉样β蛋白通过一个复杂的机制诱导Tau超磷酸化,但参与这一线性过程的主要因素仍不清楚。实验发现淀粉样β蛋白通过激活JNK激酶调节Tau的高磷酸化和毒性。重要的是,淀粉样β蛋白的毒性依赖于Tau的过度磷酸化;低磷酸化的Tau突变体对淀粉样β蛋白的毒性是绝缘的。令人震惊的是,Tau的积累可以相互干扰淀粉样β蛋白的降解,与淀粉样β蛋白降解酶,如dNep1,3,dMmp2,dNep4和dIDE的减少相关。研究结果表明,淀粉样β蛋白和Tau协同加速阿尔茨海默病的进展,这可以考虑作为未来阿尔茨海默病治疗的联合标靶。

https://orcid.org/0000-0003-4116-7934 (Yun-Peng Huang); https://orcid.org/0000-0002-6585-9284 (Bing Zhou); https://orcid.org/0000-0002-3065-5599 (Jia-Rui Wu)

Abstract: Extracellular aggregation of amyloid-beta (Aβ) and intracellular tau tangles are two major pathogenic hallmarks and critical factors of Alzheimer’s disease. A linear interaction between Aβ and tau protein has been characterized in several models. Aβ induces tau hyperphosphorylation through a complex mechanism; however, the master regulators involved in this linear process are still unclear. In our study with Drosophila melanogaster, we found that Aβ regulated tau hyperphosphorylation and toxicity by activating c-Jun N-terminal kinase. Importantly, Aβ toxicity was dependent on tau hyperphosphorylation, and flies with hypophosphorylated tau were insulated against Aβ-induced toxicity. Strikingly, tau accumulation reciprocally interfered with Aβ degradation and correlated with the reduction in mRNA expression of genes encoding Aβ-degrading enzymes, including dNep1, dNep3, dMmp2, dNep4, and dIDE. Our results indicate that Aβ and tau protein work synergistically to further accelerate Alzheimer’s disease progression and may be considered as a combined target for future development of Alzheimer’s disease therapeutics.

Key words: Alzheimer’s disease, amyloid-beta, amyloid-beta degradation, Drosophila melanogaster, c-Jun N-terminal kinase (JNK), neurodegeneration, tau, tau hyperphosphorylation