在 Aβ 积累过程中,新合成蛋白质的时间定量分析。
Temporal Quantitative Profiling of Newly Synthesized Proteins during Aβ Accumulation.
机构信息
Department of Chemical Physiology and Molecular and Cellular Neurobiology, The Scripps Research Institute, La Jolla, California 92037, United States.
出版信息
J Proteome Res. 2021 Jan 1;20(1):763-775. doi: 10.1021/acs.jproteome.0c00645. Epub 2020 Nov 4.
Accumulation of aggregated amyloid beta (Aβ) in the brain is believed to impair multiple cellular pathways and play a central role in Alzheimer's disease pathology. However, how this process is regulated remains unclear. In theory, measuring protein synthesis is the most direct way to evaluate a cell's response to stimuli, but to date, there have been few reliable methods to do this. To identify the protein regulatory network during the development of Aβ deposition in AD, we applied a new proteomic technique to quantitate newly synthesized protein (NSP) changes in the cerebral cortex and hippocampus of 2-, 5-, and 9-month-old APP/PS1 AD transgenic mice. This bio-orthogonal noncanonical amino acid tagging analysis combined PALM (pulse azidohomoalanine labeling in mammals) and HILAQ (heavy isotope labeled AHA quantitation) to reveal a comprehensive dataset of NSPs prior to and post Aβ deposition, including the identification of proteins not previously associated with AD, and demonstrated that the pattern of differentially expressed NSPs is age-dependent. We also found dysregulated vesicle transportation networks including endosomal subunits, coat protein complex I (COPI), and mitochondrial respiratory chain throughout all time points and two brain regions. These results point to a pathological dysregulation of vesicle transportation which occurs prior to Aβ accumulation and the onset of AD symptoms, which may progressively impact the entire protein network and thereby drive neurodegeneration. This study illustrates key pathway regulation responses to the development of AD pathogenesis by directly measuring the changes in protein synthesis and provides unique insights into the mechanisms that underlie AD.
淀粉样蛋白β(Aβ)的聚集物在大脑中的积累被认为会损害多种细胞途径,并在阿尔茨海默病的病理中发挥核心作用。然而,这个过程是如何被调节的仍然不清楚。从理论上讲,测量蛋白质合成是评估细胞对刺激反应的最直接方法,但迄今为止,很少有可靠的方法来做到这一点。为了确定 AD 中 Aβ沉积发展过程中的蛋白质调节网络,我们应用了一种新的蛋白质组学技术来定量分析 APP/PS1 AD 转基因小鼠大脑皮层和海马体中新合成的蛋白质(NSP)的变化。这种生物正交的非典型氨基酸标记分析结合 PALM(哺乳动物中的脉冲叠氮同型丙氨酸标记)和 HILAQ(重同位素标记 AHA 定量),揭示了 Aβ沉积前后 NSP 的综合数据集,包括鉴定以前与 AD 无关的蛋白质,并表明差异表达的 NSP 模式是年龄依赖性的。我们还发现,在内体亚基、衣壳蛋白复合物 I(COPI)和线粒体呼吸链中,囊泡运输网络失调,贯穿所有时间点和两个大脑区域。这些结果表明,在 Aβ积累和 AD 症状出现之前,囊泡运输就已经出现了病理性失调,这可能会逐渐影响整个蛋白质网络,从而导致神经退行性变。这项研究通过直接测量蛋白质合成的变化,说明了 AD 发病机制发展过程中关键途径调节的反应,为 AD 的发病机制提供了独特的见解。
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