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Association of Chronic Low-grade Inflammation With Risk of Alzheimer Disease in ApoE4 Carriers
Open accessAbstract
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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“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 APOE Genotype‐Dependent Manner: A Prospective Cohort Study (2026) · cites this paper as [20]
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“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
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“In APOE4 carriers, chronic inflammation has been linked to an accelerated onset of AD symptoms [77].”
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“SBP, mm Hg, mean (SD) 133 (19) 131 (20) 135 (21) 134 (22)”
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“Previous reports have indicated that chronic low-grade inflammation is potentially associated with an increased risk of metabolic syndrome [7], atherosclerotic disease [8], Alzheimer’s disease [9], and cancer [10].”
BackgroundJun, G., You, Y., Zhu, C., Meng, G., Chung, J., Panitch, R., Hu, J., Xia, W., Bennett, D. A., Foroud, T., et al. (2022) · Alzheimer s & Dementia · doi:10.1002/alz.12607 · Cited by 35
Self-citationLipids and brain inflammation in APOE4-associated dementia
Duro, M. V. V., Ebright, B., & Yassine, H. N. (2021) · Current Opinion in Lipidology · doi:10.1097/mol.0000000000000801 · Cited by 39
“The correlation between APOE4 and inflammation was clearly demonstrated in the Framingham cohort, where participants with APOE4 and elevated plasma C-reactive protein levels had a greater risk of developing AD dementia than age and sex-matched APOE2 and APOE3 carriers [60].”
BackgroundAssociation between inflammatory biomarkers and cognitive aging
Fang, Y., Doyle, M. F., Chen, J., Alosco, M. L., Mez, J. B., Satizábal, C. L., Qiu, W. Q., Murabito, J. M., & Lunetta, K. L. (2022) · PLoS ONE · doi:10.1371/journal.pone.0274350 · Cited by 38
Self-citationZhang, Z., Gan, Q., Han, J., Tao, Q., Qiu, W. Q., & Madri, J. A. (2023) · Journal of Cerebral Blood Flow & Metabolism · doi:10.1177/0271678x231170041 · Cited by 37
Self-citationAltered SPMs and age‐associated decrease in brain DHA in APOE4 female mice
Martinsen, A., Tejera, N., Vauzour, D., Harden, G., Dick, J., Shinde, S., Barden, A. E., Mori, T. A., & Minihane, A. M. (2019) · The FASEB Journal · doi:10.1096/fj.201900423r · Cited by 38
“Neuroinflammation plays a key role in neuronal function and AD pathology (49).”
BackgroundAlzheimer's disease mechanisms in peripheral cells: Promises and challenges
Trushina, E. V. (2019) · Alzheimer s & Dementia Translational Research & Clinical Interventions · doi:10.1016/j.trci.2019.06.008 · Cited by 35
Targeting Infectious Agents as a Therapeutic Strategy in Alzheimer’s Disease
Fülöp, T., Munawara, U., Larbi, A., Desroches, M., Rodrigues, S., Catanzaro, M., Guidolin, A., Khalil, A., Bernier, F., Barron, A. E., et al. (2020) · CNS Drugs · doi:10.1007/s40263-020-00737-1 · Cited by 32
Senescent accelerated prone 8 (SAMP8) mice as a model of age dependent neuroinflammation
Fernández, A., Quintana, E., Velasco, P., Moreno-Jimenez, B., de Andrés, B., Gaspar, M.-L., Liste, I., Vilar, M., Mira, H., & Cano, E. (2021) · Journal of Neuroinflammation · doi:10.1186/s12974-021-02104-3 · Cited by 38
Uchio, R., Kawasaki, K., Okuda-Hanafusa, C., Saji, R., Muroyama, K., Murosaki, S., Yamamoto, Y., & Hirose, Y. (2021) · Nutrition Journal · doi:10.1186/s12937-021-00748-8 · Cited by 42
“Previous reports indicated that chronic low-grade inflammation is potentially associated with an increased risk of metabolic syndrome [7], atherosclerotic disease [8], Alzheimer’s disease [9], neurodegenerative disease [2], sickness behaviors and mood disturbance [10], cancer [11], and mortality [12, 13].”
BackgroundThe emerging role of brain neuroinflammatory responses in Alzheimer’s disease
AmeliMojarad, M., AmeliMojarad, M., & Cui, X. (2024) · Frontiers in Aging Neuroscience · doi:10.3389/fnagi.2024.1391517 · Cited by 34
Systemic inflammation as a moderator between sleep and incident dementia
Baril, A., Beiser, A., Redline, S. S., McGrath, E. R., Aparicio, H. J., Gottlieb, D. J., Seshadri, S. S., Pase, M. P., & Himali, J. J. (2020) · SLEEP · doi:10.1093/sleep/zsaa164 · Cited by 31
The Role of Chronic Infection in Alzheimer’s Disease: Instigators, Co-conspirators, or Bystanders?
Butler, L., & Walker, K. A. (2021) · Current Clinical Microbiology Reports · doi:10.1007/s40588-021-00168-6 · Cited by 30
Asthma amplifies dementia risk: Evidence from CSF biomarkers and cognitive decline
Nair, A. K., Hulle, C. A. V., Bendlin, B. B., Zetterberg, H., Blennow, K., Wild, N., Kollmorgen, G., Suridjan, I., Busse, W. W., & Rosenkranz, M. A. (2022) · Alzheimer s & Dementia Translational Research & Clinical Interventions · doi:10.1002/trc2.12315 · Cited by 31
Botchway, B. O., Okoye, F. C., Chen, Y., Arthur, W. E., & Fang, M. (2022) · Aging and disease · doi:10.14336/ad.2021.0616 · Cited by 32
Wandering along the epigenetic timeline
Topart, C., Werner, E., & Arimondo, P. B. (2020) · Clinical Epigenetics · doi:10.1186/s13148-020-00893-7 · Cited by 34
“Chronic inflammation promotes numerous age-related pathologies, such as cance r [90] and neurodegenerative diseases [91, 92], hence the need to prevent it.”
BackgroundInflammatory and Pro-resolving Mediators in Frontotemporal Dementia and Alzheimer’s Disease
Fraga, V. G., Magalhaes, C. A., Loures, C. D. M. G., de Souza, L. C., Guimarães, H. C., Zauli, D. A. G., Ferriani, M. D. G. C., Ferreira, C. N., Caramelli, P., Sousa, L. P., et al. (2019) · Neuroscience · doi:10.1016/j.neuroscience.2019.09.008 · Cited by 28
Mekli, K., Lophatananon, A., Maharani, A., Nazroo, J. Y., & Muir, K. R. (2023) · PLoS ONE · doi:10.1371/journal.pone.0288045 · Cited by 28
Biological brain age and resilience in cognitively unimpaired 70‐year‐old individuals
Marseglia, A., Dartora, C. M., Samuelsson, J., Poulakis, K., Mohanty, R., Shams, S., Lindberg, O. E., Rydén, L., Sterner, T. R., Skoog, J., et al. (2024) · Alzheimer s & Dementia · doi:10.1002/alz.14435 · Cited by 27
“53,54 More recently, Hayek and coll.”
Oxytocin and elderly MRI-based hippocampus and amygdala volume: a 7-year follow-up study
Orihashi, R., Mizoguchi, Y., Imamura, Y., Yamada, S., Ueno, T., & Monji, A. (2020) · Brain Communications · doi:10.1093/braincomms/fcaa081 · Cited by 27
“Alzheimer’s disease is related to inflammation and treating chronic systemic inflammation may be effective in the prevention and intervention of Alzheimer’s disease (Tao et al. , 2018).”
Ferguson, A., Tank, R., Lyall, L. M., Ward, J., Celis-Morales, C. A., Strawbridge, R. J., Ho, F. K. W., Whelan, C. D., Gill, J. M. R., Welsh, P. I., et al. (2020) · Journal of Alzheimer s Disease · doi:10.3233/jad-200338 · Cited by 26
Beyond the amyloid cascade: An update of Alzheimer's disease pathophysiology
Gouilly, D., Rafiq, M., Nogueira, L., Salabert, A., Payoux, P., Péran, P., & Pariente, J. (2023) · Revue Neurologique · doi:10.1016/j.neurol.2022.12.006 · Cited by 31
Myasoedova, E., Sattui, S. E., Lee, J., O'Brien, J. T., & Makris, U. E. (2024) · The Lancet Rheumatology · doi:10.1016/s2665-9913(24)00190-5 · Cited by 29
Fang, Y., Doyle, M. F., Alosco, M. L., Mez, J., Satizábal, C. L., Qiu, W. Q., Lunetta, K. L., & Murabito, J. M. (2022) · Journal of Alzheimer s Disease · doi:10.3233/jad-215533 · Cited by 25
Self-citationMhatre‐Winters, I., Eid, A., Han, Y., Tieu, K., & Richardson, J. R. (2022) · International Journal of Molecular Sciences · doi:10.3390/ijms23179829 · Cited by 26
“Importantly, this is consistent with clinical data from healthy individuals carrying the APOE3 or APOE4 gene; APOE4 females show a greater increase in both pro-inflammatory cytokine release and gene expression [82,85,86].”
ResultAyyubova, G., Kodali, M., Upadhya, R., Madhu, L. N., Attaluri, S., Somayaji, Y., Shuai, B., Rao, S., Shankar, G., & Shetty, A. K. (2023) · Journal of Neuroinflammation · doi:10.1186/s12974-023-02971-y · Cited by 25
Abbatecola, A. M., Giuliani, A., Biscetti, L., Scisciola, L., Battista, P., Barbieri, M., Sabbatinelli, J., & Olivieri, F. (2024) · Ageing Research Reviews · doi:10.1016/j.arr.2024.102257 · Cited by 22
Abdulhameed, N., Babin, A., Hansen, K. M., Weaver, R. R., Banks, W. A., Talbot, K., & Rhea, E. M. (2024) · Alzheimer s Research & Therapy · doi:10.1186/s13195-024-01537-1 · Cited by 25
“Alzheimer’s disease (AD) is a progressive neurocognitive/ neurodegenerative disorder [1, 2] that leads to the most common type of dementia [3, 4].”
Low, A., Su, L., Stefaniak, J. D., Mak, E., Dounavi, M., Terrera, G. M., Ritchie, K. A., Ritchie, C. W., Markus, H. S., & O'Brien, J. T. (2020) · Neurobiology of Aging · doi:10.1016/j.neurobiolaging.2020.10.029 · Cited by 26
Saleh, R. N. M., West, A. L., Ostermann, A. I., Schebb, N. H., Calder, P. C., & Minihane, A. M. (2021) · Frontiers in Nutrition · doi:10.3389/fnut.2021.723813 · Cited by 22
Zhao, X., Lu, J., Zhang, J., Liu, C., Wang, H., Wāng, Y., & Du, Q. (2024) · Psychoneuroendocrinology · doi:10.1016/j.psyneuen.2024.107065 · Cited by 22
C-reactive protein: the nexus between inflammation and protein misfolding diseases
Roy, A., Zeller, J., Nero, T. L., Klepetko, J., Eisenhardt, S. U., Parker, M. W., McFadyen, J. D., & Peter, K. (2025) · Frontiers in Immunology · doi:10.3389/fimmu.2025.1612703 · Cited by 23
Na, H., Yang, J. B., Zhang, Z., Gan, Q., Tian, H., Rajab, I. M., Potempa, L. A., Tao, Q., & Qiu, W. Q. (2023) · Neurobiology of Aging · doi:10.1016/j.neurobiolaging.2023.02.013 · Cited by 27
Self-citationMechanisms of comorbidity between Alzheimer's disease and pain
Yao, K., Wang, S., Xu, Z., Fan, Z., Chen, Z., Jia, P., Tu, S., Liu, Y., Lin, X., Xu, Y., et al. (2025) · Alzheimer s & Dementia · doi:10.1002/alz.14605 · Cited by 23
“99,100 This process activates glial cells, intensifying neuroinflammation.”
Kelliny, S., Zhou, X., & Bobrovskaya, L. (2025) · Journal of Neuroscience Research · doi:10.1002/jnr.70046 · Cited by 27
“Also, a chronic inflammatory state is linked to earlier onset of the disease in APOEε4 carriers (Tao et al. 2018).”
Huang, J., Tao, Q., Ang, T. F. A., Farrell, J. J., Zhu, C., Wang, Y., Stein, T. D., Lunetta, K. L., Massaro, J. M., Mez, J., et al. (2022) · Translational Psychiatry · doi:10.1038/s41398-022-02281-6 · Cited by 21
“DISCUSSION The results of this study extend our previous finding that elevated CRP impacts AD risk among APOE ε4 carriers [8] and the wellestablished relationship between inflammation and AD [40–42].”
MethodResultSelf-citationHe, C., Wu, D., Wei, X., Li, Y., Liao, Y., & Yang, D. (2023) · Nutrition Metabolism and Cardiovascular Diseases · doi:10.1016/j.numecd.2023.10.006 · Cited by 22
Faraji, P., Kühn, H., & Ahmadian, S. (2024) · Journal of Molecular Neuroscience · doi:10.1007/s12031-024-02224-4 · Cited by 25
“In a medium-scale (some 2500 patients) epidemiological study, the impact of chronic low-grade peripheral inflammation in APOE4 allele carriers was tested on the onset of AD (Tao et al. 2018).”
BackgroundChen, X. R., Initiative, A. D. N., Shao, Y., & Sadowski, M. J. (2021) · Journal of Alzheimer s Disease · doi:10.3233/jad-210434 · Cited by 22
Statins for vascular dementia: A hype or hope
Raja, H. G., Al-Kuraishy, H. M., Shokr, M. M., Al-Gareeb, A. I., Al‐Harchan, N. A., Alruwaili, M., Papadakis, M., Alexiou, A. T., & Batiha, G. E. (2024) · Neuroscience · doi:10.1016/j.neuroscience.2024.12.059 · Cited by 21
“A cohort study indicated that high levels of systemic inflammatory biomarkers hasten the development of AD (Tao et al., 2018) .”
The Prevalence and Risk Factors of Cerebral Microbleeds: A Community-Based Study in China
Luo, Q., Tang, H., Xu, X., Huang, J., Wang, P., He, G., Song, X., Huang, Y., Chen, S., Yan, F., et al. (2021) · Therapeutics and Clinical Risk Management · doi:10.2147/tcrm.s297708 · Cited by 17
“Also, APOE ε4 carriers were tended to produce a stronger neuroinflammatory responding to peripheral systemic inflammation.(28) CR1, a receptor for complement C3b/ C4b, is also a central or peripheral factor involving complement mediated inflammation.”
Background
Metadata
- 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
- ORCID
- Venue
- JAMA Network Open
- Publisher
- American Medical Association (AMA)
- Published
- 2018-10-19
- Volume
- 1
- Issue
- 6
- Pages
- e183597
- ISSN
- 2574-3805 (ISSN-L)
- PMC
- PMC6324596
- 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
- gold
- doi.org
- 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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