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A small-molecule TLR4 antagonist reduced neuroinflammation in female E4FAD mice
Abstract
Background: APOE genotype is the greatest genetic risk factor for sporadic Alzheimer’s disease (AD). APOE4 increases AD risk up to 12-fold compared to APOE3 , an effect that is greater in females. Evidence suggests that one-way APOE could modulate AD risk and progression through neuroinflammation. Indeed, APOE4 is associated with higher glial activation and cytokine levels in AD patients and mice. Therefore, identifying pathways that contribute to APOE4 -associated neuroinflammation is an important approach for understanding and treating AD. Human and in vivo evidence suggests that TLR4, one of the key receptors involved in the innate immune system, could be involved in APOE -modulated neuroinflammation. Consistent with that idea, we previously demonstrated that the TLR4 antagonist IAXO-101 can reduce LPS- and Aβ-induced cytokine secretion in APOE4 glial cultures. Therefore, the goal of this study was to advance these findings and determine whether IAXO-101 can modulate neuroinflammation, Aβ pathology, and behavior in mice that express APOE4 . Methods: We used mice that express five familial AD mutations and human APOE3 (E3FAD) or APOE4 (E4FAD). Female and male E4FAD mice and female E3FAD mice were treated with vehicle or IAXO-101 in two treatment paradigms: prevention from 4 to 6 months of age or reversal from 6 to 7 months of age. Learning and memory were assessed by modified Morris water maze. Aβ deposition, fibrillar amyloid deposition, astrogliosis, and microgliosis were assessed by immunohistochemistry. Soluble levels of Aβ and apoE, insoluble levels of apoE and Aβ, and IL-1β were measured by ELISA. Results: IAXO-101 treatment resulted in lower Iba-1 coverage, lower number of reactive microglia, and improved memory in female E4FAD mice in both prevention and reversal paradigms. IAXO-101-treated male E4FAD mice also had lower Iba-1 coverage and reactivity in the RVS paradigm, but there was no effect on behavior. There was also no effect of IAXO-101 treatment on neuroinflammation and behavior in female E3FAD mice. Conclusion: Our data supports that TLR4 is a potential mechanistic therapeutic target for modulating neuroinflammation and cognition in APOE4 females.
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TLR4 signaling shifts microglia toward an inflammatory state that is more disease-associated, ultimately compromising neuroprotection and cognitive function.
“In addition, TLR4 signaling has been shown to shift microglia toward an inflammatory state that is more disease-associated, ultimately compromising neuroprotection and cognitive function [139–143].”
From microRNA-132 attenuates inflammation in induced pluripotent stem cell-derived microglia from Alzheimer’s disease patients (2026) · cites this paper as [140]
The Results report fewer reactive microglia after TLR4-antagonist treatment in female E4FAD mice, and the Discussion links reduced microglial neuroinflammation to improved memory in female APOE4 carriers. The paper does not establish that TLR4 signaling shifts microglia into a specifically disease-associated state or that it generally compromises neuroprotection; the Discussion notes that microglia can be neuroprotective in early AD. (LLM, conf=0.84)
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Cited by
Sorted by citations
Penning, A., Snoeck, S., Ormaechea, O. R., Ayyildiz, D., Polzer, O., Buitrago-Arango, M., Capobianco, R., de Winter, F., Balusu, S., Verhaagen, J., et al. (2026) · Acta Neuropathologica Communications · doi:10.1186/s40478-026-02228-8 · Cited by 6
Metadata
- Authors
- Balu, D., Valencia-Olvera, A. C., Nguyen, A., Patnam, M., York, J., Peri, F., Neumann, F., LaDu, M. J., & Tai, L. M.
- Venue
- Alzheimer's Research & Therapy
- Published
- 2023-10-19
- Volume
- 15
- Issue
- 1
- ISSN
- 1758-9193
- PMC
- PMC10585767
- Cited by
- 27
- References
- 31
- Language
- en
- Funders
- National Institutes of Health (R01 AG057008, R01 AG058068, R21 AG044682-01, R01AG061114)
- College of Medicine, University of Illinois at Chicago (Institutional funds)
- Louis and Christine Friedrich (Philanthropic support)
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
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