Cited by 240Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration Mechanisms

Association of Chronic Low-grade Inflammation With Risk of Alzheimer Disease in ApoE4 Carriers

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Abstract

Importance: The association between peripheral inflammatory biomarkers and Alzheimer disease (AD) is not consistent in the literature. It is possible that chronic inflammation, rather than 1 episode of inflammation, interacts with genetic vulnerability to increase the risk for AD. Objective: To study the interaction between the apolipoprotein E (ApoE) genotype and chronic low-grade inflammation and its association with the incidence of AD. Design, Setting, and Participants: In this cohort study, data from 2656 members of the Framingham Heart Study offspring cohort (Generation 2; August 13, 1971-November 27, 2017) were evaluated, including longitudinal measures of serum C-reactive protein (CRP), diagnoses of incident dementia including AD, and brain volume. Chronic low-grade inflammation was defined as having CRP at a high cutoff level at a minimum of 2 time points. Statistical analysis was performed from December 1, 1979, to December 31, 2015. Main Outcomes and Measures: Development of AD and brain volumes. Results: Of the 3130 eligible participants, 2656 (84.9%; 1227 men and 1429 women; mean [SD] age at last CRP measurement, 61.6 [9.5] years) with both ApoE status and longitudinal CRP measurements were included in this study analysis. Median (interquartile range) CRP levels increased with mean (SD) age (43.3 [9.6] years, 0.95 mg/L [0.40-2.35 mg/L] vs 59.1 [9.6] years, 2.04 mg/L [0.93-4.75 mg/L] vs 61.6 [9.5] years, 2.21 mg/L [1.05-5.12 mg/L]; P < .001), but less so among those with ApoE4 alleles, followed by ApoE3 then ApoE2 genotypes. During the 17 years of follow-up, 194 individuals (7.3%) developed dementia, 152 (78.4%) of whom had AD. ApoE4 coupled with chronic low-grade inflammation, defined as a CRP level of 8 mg/L or higher, was associated with an increased risk of AD, especially in the absence of cardiovascular diseases (hazard ratio, 6.63; 95% CI, 1.80-24.50; P = .005), as well as an increased risk of earlier disease onset compared with ApoE4 carriers without chronic inflammation (hazard ratio, 3.52; 95% CI, 1.27-9.75; P = .009). This phenomenon was not observed among ApoE3 and ApoE2 carriers with chronic low-grade inflammation. Finally, a subset of 1761 individuals (66.3%) underwent brain magnetic resonance imaging, and the interaction between ApoE4 and chronic low-grade inflammation was associated with brain atrophy in the temporal lobe (β = -0.88, SE = 0.22; P < .001) and hippocampus (β = -0.04, SE = 0.01; P = .005), after adjusting for confounders. Conclusions and Relevance: In this study, peripheral chronic low-grade inflammation in participants with ApoE4 was associated with shortened latency for onset of AD. Rigorously treating chronic systemic inflammation based on genetic risk could be effective for the prevention and intervention of AD.

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  • Some proinflammatory proteins in blood impact APOE genotypes differently for AD risk.

    “As some proinflammatory proteins in blood impact APOE genotypes differently for AD risk [4, 20]”

    From Blood PCSK9 Impacts Alzheimer's Disease Risk in an <i>APOE</i> Genotype‐Dependent Manner: A Prospective Cohort Study (2026) · cites this paper as [20]

    The Results report that elevated blood C-reactive protein (CRP) was linked to increased Alzheimer disease risk in ApoE4 carriers, a pattern not observed in ApoE2 or ApoE3 carriers. This supports a genotype-dependent association, but the paper examines CRP rather than multiple proteins and does not establish that it causally impacts risk. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • The inflammatory phenotype in resting APOE4 iAstrocytes could explain the mechanistic link between chronic inflammation and AD pathogenesis in APOE4 carriers.

    “Our findings of an inflammatory phenotype in resting APOE4 iAstrocytes could explain the mechanistic link between chronic inflammation and AD pathogenesis in APOE4 carriers (Tao et al., 2018).”

    From APOE2, E3, and E4 differentially modulate cellular homeostasis, cholesterol metabolism, and inflammatory response in isogenic iPSC-derived astrocytes (2022) · cites this paper as Tao et al., 2018

    The Results and Discussion report an association between chronic low-grade inflammation and increased Alzheimer disease risk in ApoE4 carriers, supporting the link the citing authors invoke. But the Discussion explicitly says the mechanism for that interaction is unknown, so this source does not establish a mechanistic link. The iAstrocyte finding is the citing authors’ own finding, not one attributed to Tao et al. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • In APOE4 carriers, chronic inflammation has been linked to an accelerated onset of AD symptoms.

    “In APOE4 carriers, chronic inflammation has been linked to an accelerated onset of AD symptoms [77].”

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Authors
Tao, Q., Ang, T. F. A., DeCarli, C., Auerbach, S. H., Devine, S., Stein, T. D., Zhang, X., Massaro, J., Au, R., & Qiu, W. Q.
Affiliations
  • Boston University (US)
  • University of California Davis Medical Center (US)
Corresponding author
  • Au, Rhoda
  • Qiu, Wei Qiao
Venue
JAMA Network Open
Published
2018-10-19
Volume
1
Issue
6
Pages
e183597
ISSN
2574-3805 (ISSN-L)
OpenAlex
W2896917224
Cited by
239
References
34
Citations by year
2026: 19 · 2025: 38 · 2024: 40 · 2023: 33 · 2022: 38 · 2021: 32 · 2020: 26 · 2019: 13
FWCI
13.87
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • JAMA Network Open (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (n01hc25195-41-0-1)
  • National Institute on Aging (P30AG010129, K24AG050842, U01AG052409, R01AG054076)
  • National Heart, Lung, and Blood Institute (N01‐HC25195)
  • National Institute of Neurological Disorders and Stroke (R01NS017950)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
Alzheimer's disease, low-grade inflammation, apolipoprotein E, APOE ε4 carriers, C-reactive protein, inflammatory markers, dementia incidence, brain volume, cardiovascular disease, Framingham Offspring cohort, APOE3, APOE2
MeSH terms
Adult, Aged, Aged, 80 and over, Alzheimer Disease, Brain, C-Reactive Protein, Chronic Disease, Female, Humans, Inflammation, Longitudinal Studies, Magnetic Resonance Imaging, Male, Middle Aged, Risk Factors, Cohort Studies, Apolipoprotein E4

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