Cited by 643Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsNeurological Disease Mechanisms and Treatments

Regulation of Tau Pathology by the Microglial Fractalkine Receptor

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Bhaskar, Kiran, Konerth, Megan, Kokiko-Cochran, Olga N., Cardona, Astrid, Ransohoff, Richard M., Lamb, Bruce T.·2010·Neuron

Abstract

Aggregates of the hyperphosphorylated microtubule-associated protein tau (MAPT) are an invariant neuropathological feature of tauopathies. Here, we show that microglial neuroinflammation promotes MAPT phosphorylation and aggregation. First, lipopolysaccharide-induced microglial activation promotes hyperphosphorylation of endogenous mouse MAPT in nontransgenic mice that is further enhanced in mice lacking the microglial-specific fractalkine receptor (CX3CR1) and is dependent upon functional toll-like receptor 4 and interleukin-1 (IL-1) receptors. Second, humanized MAPT transgenic mice lacking CX3CR1 exhibited enhanced MAPT phosphorylation and aggregation as well as behavioral impairments that correlated with increased levels of active p38 MAPK. Third, in vitro experiments demonstrate that microglial activation elevates the level of active p38 MAPK and enhances MAPT hyperphosphorylation within neurons that can be blocked by administration of an interleukin-1 receptor antagonist and a specific p38 MAPK inhibitor. Taken together, our results suggest that CX3CR1 and IL-1/p38 MAPK may serve as novel therapeutic targets for human tauopathies.

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Crossref · 10.1016/j.neuron.2010.08.023

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  • Elevated levels of active (phosphorylated) p38α MAPK, but not GSK3β or regulators (p35/p25) of Cdk5, correlate with increased tau phosphorylation in the hippocampus of hTau mice deficient for CX3CR1.

    “Notably, we observed elevated levels of active (phosphorylated) p38α MAPK, but not GSK3β or regulators (p35/p25) of Cdk5, correlating with increased tau phosphorylation in the hippocampus of hTau mice deficient for the chemokine receptor CX3CR1 [22].”

    From Selective suppression of the α isoform of p38 MAPK rescues late-stage tau pathology (2016) · cites this paper as [22]

    The Results section, “Elevated p38 MAPK signaling in hTau-Cx3cr1−/− transgenic mice” (page unavailable), reports increased hippocampal phospho-p38 MAPK in six-month-old CX3CR1-deficient hTau mice, alongside increased tau phosphorylation; p35/p25 and phospho-ser9 GSK3β were unchanged. It does not identify the elevated p38 signal specifically as p38α, and the unchanged GSK3β measurement is limited to its serine-9-phosphorylated form. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • p38α-mediated cytokine overproduction in microglia has been linked to inflammation-induced neurotoxicity in a variety of mouse models.

    “The p38α-mediated cytokine overproduction in microglia has been linked to inflammation-induced neurotoxicity in a variety of mouse models [22, 27–33].”

    From Selective suppression of the α isoform of p38 MAPK rescues late-stage tau pathology (2016) · cites this paper as [22]

    The Results section on TLR4 and IL1 signaling links microglial IL1 to neuronal p38 MAPK activation and tau phosphorylation; it also reports earlier findings linking IL1β from LPS-stimulated microglia to neurotoxicity. The paper does not establish that p38α in microglia causes cytokine overproduction or show this neurotoxic mechanism across a variety of mouse models. Page numbers are not available in our copy. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Microglial activation induces tau hyperphosphorylation and cognitive impairment via activation of p38 MAPK in the hTau mouse model of tauopathy deficient for microglial fractalkine receptor CX3CR1.

    “We have demonstrated recently that activated microglia induced tau hyperphosphorylation via activation of the p38α MAPK signaling pathway in the hTau mouse model of tauopathy [22, 23].”

    From Selective suppression of the α isoform of p38 MAPK rescues late-stage tau pathology (2016) · cites this paper as [22]

    The Results section on microglial factors shows that blocking p38 MAPK prevents the tau phosphorylation induced by factors from CX3CR1-deficient microglia. The Results section on worsened disease reports impaired spatial working memory in CX3CR1-deficient hTau mice, but does not establish that p38 MAPK caused that impairment. The paper identifies p38 MAPK, not specifically the p38α isoform. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Cx3cr1-/- microglial conditioned media significantly induced tau phosphorylation on AT8 and AT180 sites.

    “As reported previously [22], exchange of 25% of the neuronal supernatant with Cx3cr1 –/– microglia CM led to an increase in tau phosphorylation on S199/S202 (AT8) and T231 (AT180) sites (Fig. 1d, e).”

    From Selective suppression of the α isoform of p38 MAPK rescues late-stage tau pathology (2016) · cites this paper as [22]

    The Experimental Procedures describe replacing 25% of neuronal medium with microglial conditioned medium. The Results report that medium from Cx3cr1−/− microglia enhanced neuronal tau phosphorylation at AT8 and PHF1, not AT180. The paper reports AT180 increases in mice under other conditions, but not in this conditioned-medium experiment; page numbers are unavailable in our copy. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Hyperphosphorylation of tau in this model was mediated by upregulation of p38α the MAPK pathway, but not GSK3β or CDK5 pathways.

    “Furthermore, hyperphosphorylation of tau in this model was mediated by upregulation of p38α the MAPK pathway, but not GSK3β or CDK5 pathways [22].”

    From Selective suppression of the α isoform of p38 MAPK rescues late-stage tau pathology (2016) · cites this paper as [22]

    The Results section on elevated p38 MAPK signaling reports increased activated p38 MAPK in hTau-Cx3cr1−/− mice, while the measured GSK3β and Cdk5-regulator markers were unchanged. The cell-culture Results show p38 MAPK-dependent tau phosphorylation, but the paper does not identify the α isoform or establish that p38α mediated the effect in the mice. (LLM, conf=0.86)

    Experimental — accuracy not yet measured

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Authors
Bhaskar, K., Konerth, M., Kokiko-Cochran, O. N., Cardona, A., Ransohoff, R. M., & Lamb, B. T.
Affiliations
Cleveland Clinic (US)
Corresponding author
Lamb, Bruce T.
Venue
Neuron
Publisher
Elsevier BV
Published
2010-10
Volume
68
Issue
1
Pages
19-31
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2153206087
Cited by
639
References
49
Citations by year
2026: 31 · 2025: 36 · 2024: 36 · 2023: 55 · 2022: 69 · 2021: 50 · 2020: 43 · 2019: 51 · 2018: 48 · 2017: 44 · 2016: 28 · 2015: 38 · 2014: 38 · 2013: 29 · 2012: 20
FWCI
15.60
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Dana Foundation
  • National Multiple Sclerosis Society
  • CurePSP
  • Alzheimer's Association
  • National Institutes of Health (AG023012)
  • American Health Assistance Foundation
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
tau hyperphosphorylation, tau aggregation, tauopathy, microglial activation, neuroinflammation, TLR4, interleukin-1 receptor, p38 MAPK, lipopolysaccharide, therapeutic target
MeSH terms
CX3C Chemokine Receptor 1, CD68 Molecule, Analysis of Variance, Animals, Animals, Newborn, Cell Count, Cells, Cultured, Disease Models, Animal, Enzyme Inhibitors, Gene Expression Regulation, Humans, Imidazoles, Lipopolysaccharides, Mice, Inbred C57BL, Models, Biological, Neurons, Phosphorylation, Pyridines, Time Factors, Antigens, Differentiation, Myelomonocytic, Antigens, CD, Silver Staining, tau Proteins, Culture Media, Conditioned, Receptors, Interleukin-1, Microglia, Mice, Knockout, Statistics, Nonparametric, Maze Learning, Coculture Techniques, Receptors, Chemokine, Tauopathies, p38 Mitogen-Activated Protein Kinases, Toll-Like Receptor 4, Mice

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