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The amphipathic GM1 molecule stabilizes amyloid aggregates preventing their cytotoxicity
Biophysical Journal ( IF 3.2 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.bpj.2020.06.005
Monica Bucciantini 1 , Manuela Leri 2 , Massimo Stefani 1 , Ronald Melki 3 , Sandra Zecchi-Orlandini 4 , Daniele Nosi 4
Affiliation  

Amyloid aggregates have been demonstrated to exert cytotoxic effects in several diseases. It is widely accepted that the complex and fascinating aggregation pathway involves a series of steps during which many heterogeneous intermediates are generated. This process may be greatly potentiated by the presence of amphipathic components of plasma membrane because they may serve as interaction, condensation, and nucleation points. However, there are few data regarding structural alterations induced by the binding between the amyloid fibrils and membrane components and its direct effects on cell integrity. In this study, we found, by 1-anilinonaphthalene 8-sulfonic acid and transmission electron microscopy/fast Fourier transform, that yeast prion Sup35 oligomers showed higher structural uniformity and altered surface properties when grown in the presence of monosialotetrahexosylganglioside, a component of the cell membrane. 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide and confocal/sensitized Förster resonance energy transfer analyses revealed that these fibrils showed low cytotoxicity and affinity to plasma membrane. Moreover, time-lapse analysis of Sup35 oligomer fibrillation on cells suggested that the amyloid aggregation process per se exerts cytotoxic effects through the interaction of amyloid intermediates with plasma membrane components. These data provide, to our knowledge, new insights to understand the mechanism of amyloid growth and cytotoxicity in the pathogenesis of amyloid diseases.

中文翻译:

两亲性 GM1 分子稳定淀粉样蛋白聚集体,防止它们的细胞毒性

淀粉样蛋白聚集体已被证明在几种疾病中发挥细胞毒性作用。人们普遍认为,复杂而迷人的聚集途径涉及一系列步骤,在此过程中会产生许多异质中间体。由于质膜的两亲性成分可以作为相互作用、凝聚和成核点,因此该过程可能会因质膜的两亲性成分的存在而大大增强。然而,关于淀粉样原纤维和膜成分之间的结合引起的结构改变及其对细胞完整性的直接影响的数据很少。在这项研究中,我们通过 1-苯胺萘 8-磺酸和透射电子显微镜/快速傅立叶变换发现,酵母朊病毒 Sup35 寡聚体在存在单唾液酸四己糖神经节苷脂(细胞膜的组成部分)的情况下生长时显示出更高的结构均匀性和改变的表面特性。3-(4,5-二甲基噻唑-2-基)-2,5-二苯基溴化四唑和共聚焦/敏化 Förster 共振能量转移分析表明,这些原纤维显示出低细胞毒性和对质膜的亲和力。此外,对细胞上 Sup35 寡聚体纤维化的延时分析表明,淀粉样蛋白聚集过程本身通过淀粉样蛋白中间体与质膜成分的相互作用发挥细胞毒性作用。据我们所知,这些数据为理解淀粉样蛋白疾病发病机制中淀粉样蛋白生长和细胞毒性的机制提供了新的见解。细胞膜的一种成分。3-(4,5-二甲基噻唑-2-基)-2,5-二苯基溴化四唑和共聚焦/敏化 Förster 共振能量转移分析表明,这些原纤维显示出低细胞毒性和对质膜的亲和力。此外,对细胞上 Sup35 寡聚体纤维化的延时分析表明,淀粉样蛋白聚集过程本身通过淀粉样蛋白中间体与质膜成分的相互作用发挥细胞毒性作用。据我们所知,这些数据为理解淀粉样蛋白疾病发病机制中淀粉样蛋白生长和细胞毒性的机制提供了新的见解。细胞膜的一种成分。3-(4,5-二甲基噻唑-2-基)-2,5-二苯基溴化四唑和共聚焦/敏化 Förster 共振能量转移分析表明,这些原纤维显示出低细胞毒性和对质膜的亲和力。此外,对细胞上 Sup35 寡聚体纤维化的延时分析表明,淀粉样蛋白聚集过程本身通过淀粉样蛋白中间体与质膜成分的相互作用发挥细胞毒性作用。据我们所知,这些数据为理解淀粉样蛋白疾病发病机制中淀粉样蛋白生长和细胞毒性的机制提供了新的见解。此外,对细胞上 Sup35 寡聚体纤维化的延时分析表明,淀粉样蛋白聚集过程本身通过淀粉样蛋白中间体与质膜成分的相互作用发挥细胞毒性作用。据我们所知,这些数据为理解淀粉样蛋白疾病发病机制中淀粉样蛋白生长和细胞毒性的机制提供了新的见解。此外,对细胞上 Sup35 寡聚体纤维化的延时分析表明,淀粉样蛋白聚集过程本身通过淀粉样蛋白中间体与质膜成分的相互作用发挥细胞毒性作用。据我们所知,这些数据为理解淀粉样蛋白疾病发病机制中淀粉样蛋白生长和细胞毒性的机制提供了新的见解。
更新日期:2020-07-01
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