Cited by 406Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsMedical Imaging Techniques and Applications

Brain β-amyloid load approaches a plateau

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Jack, Clifford R., Wiste, Heather J., Lesnick, Timothy G., Weigand, Stephen D., Knopman, David S., Vemuri, Prashanthi, Pankratz, Vernon S., Senjem, Matthew L. +5 more·2013·Neurology

Abstract

OBJECTIVE: To model the temporal trajectory of β-amyloid accumulation using serial amyloid PET imaging. METHODS: Participants, aged 70-92 years, were enrolled in either the Mayo Clinic Study of Aging (n = 246) or the Mayo Alzheimer's Disease Research Center (n = 14). All underwent 2 or more serial amyloid PET examinations. There were 205 participants classified as cognitively normal and 55 as cognitively impaired (47 mild cognitive impairment and 8 Alzheimer dementia). We measured baseline amyloid PET-relative standardized uptake values (SUVR) and, for each participant, estimated a slope representing their annual amyloid accumulation rate. We then fit regression models to predict the rate of amyloid accumulation given baseline amyloid SUVR, and evaluated age, sex, clinical group, and APOE as covariates. Finally, we integrated the amyloid accumulation rate vs baseline amyloid PET SUVR association to an amyloid PET SUVR vs time association. RESULTS: Rates of amyloid accumulation were low at low baseline SUVR. Rates increased to a maximum at baseline SUVR around 2.0, above which rates declined-reaching zero at baseline SUVR above 2.7. The rate of amyloid accumulation as a function of baseline SUVR had an inverted U shape. Integration produced a sigmoid curve relating amyloid PET SUVR to time. The average estimated time required to travel from an SUVR of 1.5-2.5 is approximately 15 years. CONCLUSION: This roughly 15-year interval where the slope of the amyloid SUVR vs time curve is greatest and roughly linear represents a large therapeutic window for secondary preventive interventions.

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  • Aβ aggregation begins in preclinical phase of AD; patients may exhibit Aβ plaque pathology for more than a decade before clinical diagnosis.

    “Aβ aggregation begins in the preclinical phase of AD. Patients may exhibit Aβ plaque pathology for more than a decade before any clinical diagnosis of AD,29,30”

    From Role of neuroinflammation in neurodegeneration development (2023) · cites this paper as [30]

    The Results section reports amyloid deposition in some cognitively normal participants and describes it as an earlier event than cognitive impairment. It also estimates roughly 15 years of amyloid accumulation between specified PET levels, but does not establish that patients had plaque pathology for more than a decade before an AD diagnosis. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • Splines have been used extensively in the literature to model longitudinal changes in Alzheimer disease biomarkers.

    “Splines have also been used extensively in the literature to model longitudinal changes in Alzheimer disease biomarkers33,34.”
  • Plaque formation rates vary over time; after rapid accumulation, plaque deposition gradually slows and by symptom manifestation is essentially done.

    “Plaque formation rates also vary over time [217]. After a period of rapid accumulation, plaque deposition gradually slows and by the time symptoms manifest plaque deposition is essentially done [20, 205, 218].”
  • Plaque deposition essentially occurs during the run-up to clinical AD.

    “Recent data indicate plaque deposition essentially occurs during the run-up to clinical AD [216, 217].”
  • Symptoms generally manifest only after plaques stop forming.

    “data argue symptoms generally manifest only after plaques stop forming (Figure 5) [205, 216, 217].”

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Research works printed but not linked: 1

  1. Fagan AM, Head D, Shah AR, et al. Decreased cerebrospi- nal fluid Abeta(42) correlates with brain atrophy in cogni- tively normal elderly. Ann Neurol 2009;65:176-183.

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Authors
Jack, C. R., Wiste, H. J., Lesnick, T. G., Weigand, S. D., Knopman, D. S., Vemuri, P., Pankratz, V. S., Senjem, M. L., Gunter, J. L., Mielke, M. M., Lowe, V. J., Boeve, B. F., & Petersen, R. C.
Affiliations
Mayo Clinic (US)
Venue
Neurology
Published
2013-03-05
Volume
80
Issue
10
Pages
890-896
ISSN
  • 0028-3878 (ISSN-L)
  • 1526-632X
OpenAlex
W2150481150
Cited by
406
References
41
Citations by year
2026: 32 · 2025: 20 · 2024: 28 · 2023: 27 · 2022: 25 · 2021: 47 · 2020: 40 · 2019: 22 · 2018: 32 · 2017: 31 · 2016: 24 · 2015: 28 · 2014: 31 · 2013: 19
FWCI
24.09
Type
journal article
Language
en
Open access
Locations
  • Neurology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Alzheimer's Association
  • Eli Lilly and Company (AG024904)
  • Pfizer (AG024904)
  • Mayo Foundation for Medical Education and Research (AG16574)
  • University of Cambridge
  • University of Oxford
  • National Institutes of Health (AG11378, U01-AG024904, AG024904, R01 AG11378, R01‐AG011378, AG16574, AG011378)
  • National Institute on Aging (U01-AG-024904, R01AG11378, P50‐AG16574, U01AG06786, R01AG040042, AG 024904, AG 16574, AG011378, U01AG006786, R01AG011378, AG-11378, R01AG041851, P50AG016574)
  • National Cancer Institute
  • National Center for Research Resources (C06RR018898)
  • Janssen Pharmaceuticals
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Medical Imaging Techniques and Applications
Keywords
amyloid-beta deposition, amyloid PET, serial imaging, S-curve, plateaus, Alzheimer's disease, mild cognitive impairment, apolipoprotein E, secondary prevention, therapeutic window, Mayo Clinic Study of Aging
MeSH terms
Aged, Aged, 80 and over, Alzheimer Disease, Brain, Humans, Amyloid beta-Peptides, Positron-Emission Tomography, Cognitive Dysfunction

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