期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 115, 期 4, 页码 E782-E791出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1714966115
关键词
Alzheimer's disease; amyloid-beta; conformational strains; spectral imaging; protein misfolding
资金
- Alzheimer's Disease Research Center [AG005136]
- Adult Changes in Thought Study [AG006781]
- Morris K. Udall Center of Excellence for Parkinson's Disease Research [NS062684]
- Alzheimer's Society
- Alzheimer's Research UK
- StratNeuro at the Karolinska Institutet
- Swedish Brain Power
- Stockholm County Council
- National Institutes of Health [AG002132, AG031220]
- UCSF Program for Breakthrough Biomedical Research
- Daiichi Sankyo Co., Ltd.
- Sherman Fairchild Foundation
- Schott Foundation for Public Education
- Rainwater Charitable Foundation
- National Institute on Aging [AG010770-19S1]
- Swiss National Science Foundation [PA164691]
- Glenn Foundation
- New Investigator Research Grant of the Alzheimer's Association
- NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE [P50NS062684] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON AGING [P50AG005136, P01AG010770, U01AG006781, R37AG031220, P01AG002132] Funding Source: NIH RePORTER
Point mutations in the amyloid-beta (A beta) coding region produce a combination of mutant and WT A beta isoforms that yield unique clinicopathologies in familial Alzheimer's disease (fAD) and cerebral amyloid angiopathy (fCAA) patients. Here, we report a method to investigate the structural variability of amyloid deposits found in fAD, fCAA, and sporadic AD (sAD). Using this approach, we demonstrate that mutant A beta determines WT A beta conformation through prion template-directed misfolding. Using principal component analysis of multiple structure-sensitive fluorescent amyloid-binding dyes, we assessed the conformational variability of A beta deposits in fAD, fCAA, and sAD patients. Comparing many deposits from a given patient with the overall population, we found that intrapatient variability is much lower than interpatient variability for both disease types. In a given brain, we observed one or two structurally distinct forms. When two forms coexist, they segregate between the parenchyma and cerebrovasculature, particularly in fAD patients. Compared with sAD samples, deposits from fAD patients show less intersubject variability, and little overlap exists between fAD and sAD deposits. Finally, we examined whether E22G (Arctic) or E22Q (Dutch) mutants direct the misfolding of WT A beta, leading to fAD-like plaques in vivo. Intracerebrally injecting mutant A beta 40 fibrils into transgenic mice expressing only WT A beta induced the deposition of plaques with many biochemical hallmarks of fAD. Thus, mutant A beta 40 prions induce a conformation of WT A beta similar to that found in fAD deposits. These findings indicate that diverse AD phenotypes likely arise from one or more initial A beta prion conformations, which kinetically dominate the spread of prions in the brain.
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