Cited by 483Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsNeurological Disease Mechanisms and Treatments

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Functional Impairment of Microglia Coincides with Beta-Amyloid Deposition in Mice with Alzheimer-Like Pathology

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Abstract

Microglial cells closely interact with senile plaques in Alzheimer's disease and acquire the morphological appearance of an activated phenotype. The significance of this microglial phenotype and the impact of microglia for disease progression have remained controversial. To uncover and characterize putative changes in the functionality of microglia during Alzheimer's disease, we directly assessed microglial behavior in two mouse models of Alzheimer's disease. Using in vivo two-photon microscopy and acute brain slice preparations, we found that important microglial functions - directed process motility and phagocytic activity - were strongly impaired in mice with Alzheimer's disease-like pathology compared to age-matched non-transgenic animals. Notably, impairment of microglial function temporally and spatially correlated with Aβ plaque deposition, and phagocytic capacity of microglia could be restored by interventionally decreasing amyloid burden by Aβ vaccination. These data suggest that major microglial functions progressively decline in Alzheimer's disease with the appearance of Aβ plaques, and that this functional impairment is reversible by lowering Aβ burden, e.g. by means of Aβ vaccination.

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Crossref · 10.1371/journal.pone.0060921

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Figure 1 Lesion-directed microglial process movement is impaired in a mouse model of cerebral amyloidosis. (A) Representative intravital two-photon microscopy images and (B) time course of microglial process movement towards a laser-induced micro-lesion (dashed circle) in 8 month old live anaesthetized APPPS1-Cx3cr1 +/gfp (n = 6) and Cx3cr1 +/gfp mice (n = 8). Aβ plaques are stained with Methoxy-XO4 (blue, *). (C) Representative images and (D) relative microglial response to laser lesions in acute cortical cerebral slices of 10 month old APPPS1-Cx3cr1 +/gfp (n = 8) and Cx3cr1 +/gfp (n = 7) mice. Aβ plaques are stained with Thiazine Red (red, *). Data are mean ± s.e.m, *p<0.05. Scale bars: 10 µm. a.u. = arbitrary units.
Figure 1 Lesion-directed microglial process movement is impaired in a mouse model of cerebral amyloidosis. (A) Representative intravital two-photon microscopy images and (B) time course of microglial process movement towards a laser-induced micro-lesion (dashed circle) in 8 month old live anaesthetized APPPS1-Cx3cr1 +/gfp (n = 6) and Cx3cr1 +/gfp mice (n = 8). Aβ plaques are stained with Methoxy-XO4 (blue, *). (C) Representative images and (D) relative microglial response to laser lesions in acute cortical cerebral slices of 10 month old APPPS1-Cx3cr1 +/gfp (n = 8) and Cx3cr1 +/gfp (n = 7) mice. Aβ plaques are stained with Thiazine Red (red, *). Data are mean ± s.e.m, *p<0.05. Scale bars: 10 µm. a.u. = arbitrary units.CC BY · PubMed Central
Figure 2 Phagocytic capacity of cortical microglia is impaired in two mouse models of cerebral amyloidosis. (A) Representative images (left) and microglial phagocytic index (in arbitrary units, a.u., right) of 9 month old APPPS1 mice and wildtype littermate controls (3 mice per genotype; p<0.001). Images show microglia (Iba-1, red), Aβ (4G8, blue) and fluorescent microspheres (green). Orthogonal views of z-stack images are shown in the bottom panel. (B) Representative images (left) and microglial phagocytic index of 20 month old APP23 and age-matched control mice (3 mice per genotype, p<0.001, right) are shown. Data are mean ± s.e.m, ***p<0.001. Scale bars: 10 µm.
Figure 2 Phagocytic capacity of cortical microglia is impaired in two mouse models of cerebral amyloidosis. (A) Representative images (left) and microglial phagocytic index (in arbitrary units, a.u., right) of 9 month old APPPS1 mice and wildtype littermate controls (3 mice per genotype; p<0.001). Images show microglia (Iba-1, red), Aβ (4G8, blue) and fluorescent microspheres (green). Orthogonal views of z-stack images are shown in the bottom panel. (B) Representative images (left) and microglial phagocytic index of 20 month old APP23 and age-matched control mice (3 mice per genotype, p<0.001, right) are shown. Data are mean ± s.e.m, ***p<0.001. Scale bars: 10 µm.CC BY · PubMed Central
Figure 3 Impairment of microglial phagocytosis in APPPS1 mice correlates with Aβ plaque deposition. (A) Aβ plaque load (brain area covered by Thiazine red-positive plaques) and relative microglial phagocytic activity normalized to corresponding wildtype littermate in the cortex of 7–9 week, 4 and 9 month old APPPS1 mice. 7–9 week old mice were sub-classified according to apparent 4G8 positive plaque deposition as with (+) or without (−) detectable plaque load. (B) Correlation between extent of plaque load and relative microglial phagocytic activity in the cortex of APPPS1 mice. (C, D) Thiazine red-covered area and relative phagocytic activity of microglia in the hippocampus of 7–9 week and 4 month old mice (C) and in the cerebellum of 4 month old APPPS1 mice (D). Absolute values of microglial phagocytic indices from APPPS1 mice were normalized to wildtype littermate controls (3–4 mice per age group and genotype, ***p<0.001). (E) Phagocytic index (3 independent experiments, p = 0.181) and representative images of primary microglial cultures from wildtype and APPPS1 mice. Microglia (Iba-1, red), nuclei (DRAQ5, blue) and microspheres (green). All data are mean ± s.e.m, *p<0.05, **p<0.01. a.u. = arbitrary units. Scale bars: 10 µm.
Figure 3 Impairment of microglial phagocytosis in APPPS1 mice correlates with Aβ plaque deposition. (A) Aβ plaque load (brain area covered by Thiazine red-positive plaques) and relative microglial phagocytic activity normalized to corresponding wildtype littermate in the cortex of 7–9 week, 4 and 9 month old APPPS1 mice. 7–9 week old mice were sub-classified according to apparent 4G8 positive plaque deposition as with (+) or without (−) detectable plaque load. (B) Correlation between extent of plaque load and relative microglial phagocytic activity in the cortex of APPPS1 mice. (C, D) Thiazine red-covered area and relative phagocytic activity of microglia in the hippocampus of 7–9 week and 4 month old mice (C) and in the cerebellum of 4 month old APPPS1 mice (D). Absolute values of microglial phagocytic indices from APPPS1 mice were normalized to wildtype littermate controls (3–4 mice per age group and genotype, ***p<0.001). (E) Phagocytic index (3 independent experiments, p = 0.181) and representative images of primary microglial cultures from wildtype and APPPS1 mice. Microglia (Iba-1, red), nuclei (DRAQ5, blue) and microspheres (green). All data are mean ± s.e.m, *p<0.05, **p<0.01. a.u. = arbitrary units. Scale bars: 10 µm.CC BY · PubMed Central
Figure 4 Passive anti-Aβ vaccination reduces plaque burden and restores hippocampal microglial phagocytic activity. 5 month old APPPS1 mice (n = 3 mice per group) and wildtype littermates (n = 2 mice per group) were biweekly injected intraperitoneally with IgG (black bar) or anti-Aβ antibody (Ab9, grey bar) for 6 weeks. The area covered by Thiazine Red-positive Aβ plaques in cortex (A) and hippocampus (B) of 6.5 month old APPPS1 mice or age-matched controls treated with IgG or Ab9 is shown in the left panel. Absolute values of microglial phagocytic indices in the cortex (A) and hippocampus (B) of the same mice are depicted on the right panel. All data are mean ± s.e.m, *p<0.05, **p<0.01. a.u. = arbitrary units.
Figure 4 Passive anti-Aβ vaccination reduces plaque burden and restores hippocampal microglial phagocytic activity. 5 month old APPPS1 mice (n = 3 mice per group) and wildtype littermates (n = 2 mice per group) were biweekly injected intraperitoneally with IgG (black bar) or anti-Aβ antibody (Ab9, grey bar) for 6 weeks. The area covered by Thiazine Red-positive Aβ plaques in cortex (A) and hippocampus (B) of 6.5 month old APPPS1 mice or age-matched controls treated with IgG or Ab9 is shown in the left panel. Absolute values of microglial phagocytic indices in the cortex (A) and hippocampus (B) of the same mice are depicted on the right panel. All data are mean ± s.e.m, *p<0.05, **p<0.01. a.u. = arbitrary units.CC BY · PubMed Central

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Authors
Krabbe, G., Halle, A., Matyash, V., Rinnenthal, J. L., Eom, G. D., Bernhardt, U., Miller, K. R., Prokop, S., Kettenmann, H., & Heppner, F. L.
Affiliations
  • Max Delbrück Center (DE)
  • Center of Advanced European Studies and Research (DE)
  • Charité – Universitätsmedizin Berlin (DE)
Corresponding author
  • Kettenmann, Helmut
  • Heppner, Frank L.
Venue
PLoS ONE
Published
2013-04-08
Volume
8
Issue
4
Pages
e60921
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2044090829
Cited by
478
References
41
Citations by year
2026: 15 · 2025: 29 · 2024: 31 · 2023: 25 · 2022: 44 · 2021: 56 · 2020: 40 · 2019: 41 · 2018: 38 · 2017: 38 · 2016: 33 · 2015: 39 · 2014: 34 · 2013: 13
FWCI
22.45
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • MDC Repository (Max-Delbrueck-Center for Molecular Medicine) (acceptedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Max Planck Digital Library (submittedVersion)
  • Figshare (submittedVersion, cc-by)
Funders
  • European Commission (FP7 HEALTH)
  • Deutsche Forschungsgemeinschaft (SFB TRR 43, NeuroCure EXC257, GRK1258, EXC257)
  • Jung-Stiftung für Wissenschaft und Forschung
  • National Institutes of Health
  • National Institute of Neurological Disorders and Stroke (R01NS046006, NS046006)
  • FP7 Health
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
microglia, Alzheimer's disease, amyloid plaques, microglial activation, microglial phagocytosis, mouse models of Alzheimer's disease
MeSH terms
Alzheimer Disease, Animals, Cell Movement, Disease Models, Animal, Female, Humans, Male, Mice, Transgenic, Mutation, Phagocytosis, Amyloid beta-Peptides, Protein Structure, Secondary, Microglia, Mice, Protein Multimerization, Plaque, Amyloid, Spatio-Temporal Analysis

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