Cited by 110Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsCancer-related cognitive impairment studies

Longitudinal β-Amyloid Deposition and Hippocampal Volume in Preclinical Alzheimer Disease and Suspected Non–Alzheimer Disease Pathophysiology

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Gordon, Brian A., Blazey, Tyler, Su, Yi, Fagan, Anne M., Holtzman, David M., Morris, John C., Benzinger, Tammie L. S.·2016·JAMA Neurology

Abstract

IMPORTANCE: Preclinical Alzheimer disease (AD) can be staged using a 2-factor model denoting the presence or absence of β-amyloid (Aβ+/-) and neurodegeneration (ND+/-). The association of these stages with longitudinal biomarker outcomes is unknown. OBJECTIVE: To examine whether longitudinal Aβ accumulation and hippocampal atrophy differ based on initial preclinical staging. DESIGN, SETTING, AND PARTICIPANTS: This longitudinal population-based cohort study used data collected at the Knight Alzheimer Disease Research Center, Washington University, St Louis, Missouri, from December 1, 2006, to June 31, 2015. Cognitively normal older adults (n = 174) were recruited from the longitudinal Adult Children Study and Healthy Aging and Senile Dementia Study at the Knight Alzheimer Disease Research Center. At baseline, all participants had magnetic resonance imaging (MRI) scans, positron emission tomography (PET) scans with carbon 11-labeled Pittsburgh Compound B (PiB), and cerebrospinal fluid assays of tau and phosphorylated tau (ptau) acquired within 12 months. Using the baseline biomarkers, individuals were classified into preclinical stage 0 (Aβ-/ND-), 1 (Aβ+/ND-), or 2+ (Aβ+/ND+) or suspected non-AD pathophysiology (SNAP; Aβ-/ND+). MAIN OUTCOMES AND MEASURES: Subsequent longitudinal accumulation of Aβ assessed with PiB PET and loss of hippocampal volume assessed with MRI in each group. RESULTS: Among the 174 participants (81 men [46.6%]; 93 women [53.4%]; mean [SD] age, 65.7 [8.9] years), a proportion (14%-17%) of individuals with neurodegeneration alone (SNAP) later demonstrated Aβ+. The rates of Aβ accumulation and loss of hippocampal volume in individuals with SNAP were indistinguishable from those without any pathologic features at baseline (for Aβ accumulation: when hippocampal volume was used to define ND, t = 0.00 [P > .99]; when tau and ptau were used to define ND, t = -0.02 [P = .98]; for loss of hippocampal volume: when hippocampal volume was used to define ND, t = -1.34 [P = .18]; when tau and ptau were used to define ND, t = 0.84 [P = .40]). Later preclinical stages (stages 1 and 2+) had elevated Aβ accumulation. Using hippocampal volume to define ND, individuals with stage 1 had accelerated Aβ accumulation relative to stage 0 (t = 11.06; P < .001), stage 2+ (t = 2.10; P = .04), and SNAP (t = 9.32; P < .001), and those with stage 2+ had accelerated Aβ accumulation relative to stage 0 (t = 4.38; P < .001) and SNAP (t = 4.08; P < .001). When ND was defined using tau and ptau, individuals with stage 2+ had accelerated Aβ accumulation relative to stage 0 (t = 4.96) and SNAP (t = 4.06), and those with stage 1 had accelerated Aβ accumulation relative to stage 0 (t = 8.44) and SNAP (t = 6.61) (P < .001 for all comparisons). When ND was defined using cerebrospinal fluid biomarkers, individuals with stage 2+ had accelerated hippocampal atrophy relative to stage 0 (t = -3.41; P < .001), stage 1 (t = -2.48; P = .03), and SNAP (t = -2.26; P = .03). CONCLUSIONS AND RELEVANCE: More advanced preclinical stages of AD have greater longitudinal Aβ accumulation. SNAP appears most likely to capture inherent individual variability in brain structure or to represent comorbid pathologic features rather than early emerging AD. Low hippocampal volumes or elevated levels of tau or ptau in isolation may not accurately represent ongoing neurodegenerative processes.

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  1. [47]Musiek ES Holtzman DM Origins of Alzheimer's disease: reconciling cerebrospinal fluid biomarker and neuropathologydata regarding the temporal sequence of amyloid-beta and tau involvement Curr Opin Neurol 2012 25 6 715 720 23041958 PMC3682920

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Authors
Gordon, B. A., Blazey, T., Su, Y., Fagan, A. M., Holtzman, D. M., Morris, J. C., & Benzinger, T. L. S.
Affiliations
Washington University in St. Louis (US)
Corresponding author
Gordon, Brian A.
Venue
JAMA Neurology
Published
2016-10-01
Volume
73
Issue
10
Pages
1192
ISSN
2168-6149 (ISSN-L)
OpenAlex
W2509316616
Cited by
105
References
51
Citations by year
2026: 5 · 2025: 6 · 2024: 6 · 2023: 9 · 2022: 11 · 2021: 9 · 2020: 14 · 2019: 19 · 2018: 10 · 2017: 14 · 2016: 2
FWCI
13.33
Type
journal article
Language
en
Open access
Locations
  • JAMA Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (UL1TR000448)
  • National Institute on Aging (P50AG005681, P01AG003991, U01AG032438, P01AG026276)
  • National Institute of Neurological Disorders and Stroke (P30NS048056)
  • National Institute of Biomedical Imaging and Bioengineering (R01EB009352)
  • National Center for Advancing Translational Sciences
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 › Pulmonary and Respiratory Medicine › Cancer-related cognitive impairment studies
Keywords
preclinical Alzheimer's disease, amyloid-beta deposition, hippocampal atrophy, neurodegeneration, Pittsburgh compound B PET, tau protein, phosphorylated tau, cerebrospinal fluid biomarkers, longitudinal biomarker trajectories, cognitively normal older adults
MeSH terms
Aged, Alzheimer Disease, Aniline Compounds, Female, Hippocampus, Humans, Longitudinal Studies, Magnetic Resonance Imaging, Male, Middle Aged, Thiazoles, Biomarkers, Amyloid beta-Peptides, tau Proteins, Disease Progression, Positron-Emission Tomography, Prodromal Symptoms

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