Cited by 117Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsMultiple Sclerosis Research Studies

CD4 T Cells Induce A Subset of MHCII-Expressing Microglia that Attenuates Alzheimer Pathology

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Mittal, Kritika, Eremenko, Ekaterina, Berner, Omer, Elyahu, Yehezqel, Strominger, Itai, Apelblat, Daniella, Nemirovsky, Anna, Spiegel, Ivo +1 more·2019·iScience

Abstract

Microglia play a key role in innate immunity in Alzheimer disease (AD), but their role as antigen-presenting cells is as yet unclear. Here we found that amyloid β peptide (Aβ)-specific T helper 1 (Aβ-Th1 cells) T cells polarized to secrete interferon-γ and intracerebroventricularly (ICV) injected to the 5XFAD mouse model of AD induced the differentiation of major histocompatibility complex class II (MHCII)+ microglia with distinct morphology and enhanced plaque clearance capacity than MHCII- microglia. Notably, 5XFAD mice lacking MHCII exhibited an enhanced amyloid pathology in the brain along with exacerbated innate inflammation and reduced phagocytic capacity. Using a bone marrow chimera mouse model, we showed that infiltrating macrophages did not differentiate to MHCII+ cells following ICV injection of Aβ-Th1 cells and did not support T cell-mediated amyloid clearance. Overall, we demonstrate that CD4 T cells induce a P2ry12+ MHCII+ subset of microglia, which play a key role in T cell-mediated effector functions that abrogate AD-like pathology.

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Registry

Crossref · 10.1016/j.isci.2019.05.039

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  • MHCII+ microglia have higher phagocytosis rates than MHCII− microglia in 5xFAD mice.

    “MHCII+ microglia exhibited higher rates of phagocytosis than their MHCII− counterparts in 5xFAD mice (60).”

    From Reducing microglial lipid load enhances β amyloid phagocytosis in an Alzheimer’s disease mouse model (2025) · cites this paper as [60]

    The Results (Figure 2B; page not available in our copy) report greater Aβ co-localization and engulfment by MHCII+ than MHCII− cells, which the authors interpret as presumably indicating greater phagocytic activity. The comparison was made in 5XFAD mice injected with Aβ-specific Th1 cells, and the paper measured co-localization rather than phagocytosis rates directly; the citing sentence omits those qualifications. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Depletion of T cells, B cells, and natural killer (NK) cells contributes to an increase in Aβ deposition.

    “It has previously been shown that the depletion of T cells, B cells, and natural killer (NK) cells contributes to an increase in Aβ deposition [4–6].”

    From Control of the temporal development of Alzheimer’s disease pathology by the MR1/MAIT cell axis (2023) · cites this paper as [6]

    The Results section ('MHCII-Knockout 5XFAD Mice Exhibit an Exacerbated Amyloid Pathology'; page unavailable) reports increased Aβ plaques in mice lacking MHCII. The Discussion reports reduced Aβ uptake in a mouse model lacking adaptive immunity. Neither passage shows that depletion of T cells, B cells, and NK cells together increased Aβ deposition; in particular, the cited paper does not report NK-cell depletion. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • 5XFAD mice that lack MHC class II expression exhibit increased amyloid pathology.

    “a recent study found that 5XFAD mice that lack MHC class II expression exhibit increased amyloid pathology, 21”
  • Loss of MHC class II molecules increases Aβ plaques.

    “Notably, the loss of MHC class II molecules has been shown to increase Aβ plaques [3, 6].”
  • Adoptive transfer of T helper 1 (Th1) cells into AD model mice results in a decrease in the amount of Aβ.

    “Adoptive transfer of T helper 1 (Th1) cells into AD model mice results in a decrease in the amount of Aβ [6].”

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Research works printed but not linked: 1

  1. Gaikwad S. Larionov S. Wang Y. Dannenberg H. Matozaki T. Monsonego A. Thal D.R. Neumann H. Signal regulatory protein-beta1: a microglial modulator of phagocytosis in Alzheimer's disease Am. J. Pathol. 175 2009 2528 2539 19893026 PMC2789620 Gaikwad, S., Larionov, S., Wang, Y., Dannenberg, H., Matozaki, T., Monsonego, A., Thal, D.R., and Neumann, H. (2009). Signal regulatory protein-beta1: a microglial modulator of phagocytosis in Alzheimer's disease. Am. J. Pathol. 175, 2528-2539. PMC2789620 19893026

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Authors
Mittal, K., Eremenko, E., Berner, O., Elyahu, Y., Strominger, I., Apelblat, D., Nemirovsky, A., Spiegel, I., & Monsonego, A.
Affiliations
  • Ben-Gurion University of the Negev (IL)
  • Weizmann Institute of Science (IL)
Corresponding author
Monsonego, Alon
Venue
iScience
Publisher
Elsevier BV
Published
2019-06
Volume
16
Pages
298-311
ISSN
2589-0042 (ISSN-L)
OpenAlex
W2947933080
Cited by
114
References
76
Citations by year
2026: 13 · 2025: 17 · 2024: 28 · 2023: 17 · 2022: 16 · 2021: 10 · 2020: 13
FWCI
4.29
Type
journal article
Language
en
Open access
Locations
  • iScience (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Israel Science Foundation (684/14)
  • Litwin and Gural Foundations
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Multiple Sclerosis Research Studies
Keywords
Alzheimer's disease, microglia, CD4+ T cells, MHC class II, amyloid-beta, Th1 cells, interferon-gamma, amyloid plaque clearance, P2Y12 receptor, 5xFAD mice, innate immunity, phagocytosis, bone marrow chimeras, infiltrating macrophages

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