Alzheimer's disease-associated peptide Aβ42 mobilizes ER Ca(2+) via InsP3R-dependent and -independent mechanisms.

Alzheimer's disease-associated peptide Aβ42 mobilizes ER Ca(2+) via InsP3R-dependent and -independent mechanisms.
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DOI:
10.3389/fnmol.2013.00036
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发表时间:
2013
影响因子:
4.8
通讯作者:
Roderick HL
Roderick HL
中科院分区:
医学2区
文献类型:
--
作者:
Jensen LE;Bultynck G;Luyten T;Amijee H;Bootman MD;Roderick HL

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Ca2+ 稳态失调被认为会导致阿尔茨海默病 (AD) 相关淀粉样蛋白 - β - 肽 (Aβ) 的毒性作用。据报道,跨质膜的 Ca2+ 通量和细胞内储备的释放都是 Aβ42 诱导的 Ca2+ 通量的基础。在这里,我们研究了内质网 (ER) 释放的 Ca2+ 对 Aβ42 对 Ca2+ 稳态的影响的贡献以及 Aβ42 引发这些影响的机制。与之前的报道一致,应用可溶性寡聚形式的 Aβ42 诱导细胞内 Ca2+ 升高。 Aβ42 刺激的 Ca2+ 信号在细胞外 Ca2+ 不存在的情况下持续存在,表明内质网 Ca2+ 储存中的 Ca2+ 释放对这些信号的产生有显着贡献。此外,肌醇 1,4,5-三磷酸 (InsP3) 信号传导有助于 Aβ42 刺激的 Ca2+ 释放。当应用于缺乏 InsP3 受体的透化细胞时,还观察到 Aβ42 的 Ca2+ 动员作用,揭示了 Aβ42 对 ER 的额外直接作用,以及细胞内 Aβ42 诱导毒性的机制。
Dysregulation of Ca2+ homeostasis is considered to contribute to the toxic action of the Alzheimer's disease (AD)-associated amyloid-β-peptide (Aβ). Ca2+ fluxes across the plasma membrane and release from intracellular stores have both been reported to underlie the Ca2+ fluxes induced by Aβ42. Here, we investigated the contribution of Ca2+ release from the endoplasmic reticulum (ER) to the effects of Aβ42 upon Ca2+ homeostasis and the mechanism by which Aβ42 elicited these effects. Consistent with previous reports, application of soluble oligomeric forms of Aβ42 induced an elevation in intracellular Ca2+. The Aβ42-stimulated Ca2+ signals persisted in the absence of extracellular Ca2+ indicating a significant contribution of Ca2+ release from the ER Ca2+ store to the generation of these signals. Moreover, inositol 1,4,5-trisphosphate (InsP3) signaling contributed to Aβ42-stimulated Ca2+ release. The Ca2+ mobilizing effect of Aβ42 was also observed when applied to permeabilized cells deficient in InsP3 receptors, revealing an additional direct effect of Aβ42 upon the ER, and a mechanism for induction of toxicity by intracellular Aβ42.
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