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Structural characterization of A-beta strain variation in AD mouse models

AD 小鼠模型中 A-β 品系变异的结构表征

基本信息

批准号：
9789173
负责人：
Ralf Langen
金额：
$ 76.99万
依托单位：
UNIVERSITY OF SOUTHERN CALIFORNIA
依托单位国家：
美国
项目类别：
财政年份：
2018
资助国家：
美国
起止时间：
2018-09-30 至 2023-05-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/9789173
关键词：
Address Affect Age Alzheimer&apos s Disease Alzheimer&apos s disease model Amyloid Amyloid beta-Protein Amyloidosis Biochemical Biochemistry Brain Brain Diseases Brain Pathology Brain region Cerebellum Dependence Diagnostic Disease Disease Progression Electron Spin Resonance Spectroscopy Fingerprint Fluorescence Gender Goals Heterogeneity Hippocampus (Brain)Histologic Histology Human Huntington gene Image In Vitro In Vivo NMR Spectroscopy Individual Kinetics Knock-in Label Maps Masks Measures Metabolic Morphology Mouse Strains Mus NMR Spectroscopy Neurodegenerative Disorders Outcome Pathologic Patients Positioning Attribute Preparation Proteins Public Health Recombinants Research Resolution Sampling Seeds Severity of illness Structure Testing Tube Variant Work abeta accumulation aging brain alpha synuclein amyloid pathology amyloid structure design experimental study in vivo innovation monomer mouse model novel novel strategies peptide structure sex solid state nuclear magnetic resonance stable isotope structural biology targeted treatment tau Proteins therapy development

项目摘要

Abstract Structurally dissimilar aggregates (strains) of the amyloid beta peptide (Aβ) in Alzheimer's Disease (AD) can potentially explain differences seen in the progression and severity of the disease. Fibrils formed by synthetic Aβ in vitro and Aβ fibrils seeded from patient brain extracts led to a variety of Aβ strains. Previous research with AD brain seeded material led to Aβ structures that varied with patients and with the stage of disease, suggesting that specific Aβ strains not only could affect the progression of AD but also potential treatment. However, a bias using patient seeded synthetic Aβ is that seeding might select for those Aβ strains with the highest seeding potential masking other strains that could be important in the disease. Our long-term goal is to understand the basis of strain variation for several pathological proteins important in neurodegenerative disease such as tau, α-synuclein, huntingtin, and Aβ. The objective of this application is to determine the in vivo-generated structures of Aβ strains found within and between individual amyloid mouse models, which will answer the following questions: 1) Are Aβ plaques found in individual mice composed predominantly of one strain or mixtures of strains? Do strains depend on gender, brain region, or mouse model examined? How are strains impacted by seeding mice with fibrils from human brains? 2) Are seeding experiments capturing the structural variety found in AD brains or are they biased towards the most seeding competent species? 3) what are the structural differences between these strains? We will address these questions in the following 3 specific aims: In Aim 1, we will directly detect the Aβ strain variety and distribution in mouse models of amyloid pathology. This will be accomplished by measuring solid-state NMR spectra on brain extracts purified from 15N labeled APPKINL-F, APPKINL-G-F, and 5XFAD mice. A subset of 5XFAD mice will be seeded with AD patient brain extract. In Aim 2, we will determine the seeding potential of Aβ strains from amyloid mouse models. We will seed recombinant Aβ with brain extract from amyloid pathology mouse models, measure the seeding kinetics of different strains, and compare their NMR spectra to those of the original mouse brain extract and those of Aβ seeded from human AD brain extract. In Aim 3 we will determine the structures of a basis set of Aβ strains from amyloid mouse models. We will use an innovative solid-state NMR and EPR approach to determine high- resolution structures of Aβ that capture short and long-range order details. The expected outcome of these aims is that we will pioneer NMR spectroscopy on vivo-generated Aβ aggregates. We will map the distribution of Aβ strains throughout the brain, and determine the dependence of strains on brain region, gender, age, and mouse model. We will correlate the NMR structures with brain pathology by histology and biochemistry. We will develop a combined EPR and solid-state NMR approach for fibril structure determination. These outcomes will enable us to design Aβ strain dependent diagnostics and treatment for AD.

摘要