Cited by 388Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsInflammasome and immune disorders

TLR4 Cross-Talk With NLRP3 Inflammasome and Complement Signaling Pathways in Alzheimer's Disease

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Yang, Junling, Wise, Leslie, Fukuchi, Ken-ichiro·2020·Frontiers in Immunology

Abstract

Amyloid plaques, mainly composed of abnormally aggregated amyloid β-protein (Aβ) in the brain parenchyma, and neurofibrillary tangles (NFTs), consisting of hyperphosphorylated tau protein aggregates in neurons, are two pathological hallmarks of Alzheimer's disease (AD). Aβ fibrils and tau aggregates in the brain are closely associated with neuroinflammation and synapse loss, characterized by activated microglia and dystrophic neurites. Genome-wide genetic association studies revealed important roles of innate immune cells in the pathogenesis of late-onset AD by recognizing a dozen genetic risk loci that modulate innate immune activities. Furthermore, microglia, brain resident innate immune cells, have been increasingly recognized to play key, opposing roles in AD pathogenesis by either eliminating toxic Aβ aggregates and enhancing neuronal plasticity or producing proinflammatory cytokines, reactive oxygen species, and synaptotoxicity. Aggregated Aβ binds to toll-like receptor 4 (TLR4) and activates microglia, resulting in increased phagocytosis and cytokine production. Complement components are associated with amyloid plaques and NFTs. Aggregated Aβ can activate complement, leading to synapse pruning and loss by microglial phagocytosis. Systemic inflammation can activate microglial TLR4, NLRP3 inflammasome, and complement in the brain, leading to neuroinflammation, Aβ accumulation, synapse loss and neurodegeneration. The host immune response has been shown to function through complex crosstalk between the TLR, complement and inflammasome signaling pathways. Accordingly, targeting the molecular mechanisms underlying the TLR-complement-NLRP3 inflammasome signaling pathways can be a preventive and therapeutic approach for AD.

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Crossref · 10.3389/fimmu.2020.00724

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  • Among PRRs, TLRs play a crucial role in the inflammatory responses to pathogenic infection and have been a target for many studies exploring phagocytosis.

    “Among the mentioned PRRs, TLRs play crucial role in the inflammatory responses to pathogenic infection and have been a target for many studies exploring phagocytosis course [201,202,203].”

    From MicroRNAs as Regulators of Phagocytosis (2022) · cites this paper as [201]

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Authors
Yang, J., Wise, L., & Fukuchi, K.-I.
Affiliations
Peoria campus of the University of Illinois System (US)
Corresponding author
Fukuchi, Ken-ichiro
Venue
Frontiers in Immunology
Published
2020-04-23
Volume
11
Pages
724-724
ISSN
1664-3224 (ISSN-L)
OpenAlex
W3019520705
Cited by
387
References
210
Citations by year
2026: 64 · 2025: 73 · 2024: 72 · 2023: 73 · 2022: 67 · 2021: 30 · 2020: 7 · 2019: 1
FWCI
4.41
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Immunology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institutes of Health
  • National Institute on Aging (R21AG064811, R21AG056862, R21AG054937, R21AG062179, R21AG053719)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
Keywords
Alzheimer's disease, TLR4, NLRP3 inflammasome, complement system, innate immunity, microglia, amyloid-beta, neurofibrillary tangles, neuroinflammation, synaptic loss, systemic inflammation, neurodegeneration, phagocytosis, synaptic pruning
MeSH terms
NLR Family, Pyrin Domain-Containing 3 Protein, Alzheimer Disease, Animals, Complement System Proteins, Humans, Signal Transduction, Amyloid beta-Peptides, Toll-Like Receptor 4, Mice, Inflammasomes

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