Cited by 90Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsPhagocytosis and Immune Regulation

Microglia display modest phagocytic capacity for extracellular tau oligomers

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Majerova, Petra, Zilkova, Monika, Kazmerova, Zuzana, Kovac, Andrej, Paholikova, Kristina, Kovacech, Branislav, Zilka, Norbert, Novak, Michal·2014·Journal of Neuroinflammation

Abstract

BACKGROUND: Abnormal misfolded tau protein is a driving force of neurofibrillary degeneration in Alzheimer's disease. It has been shown that tau oligomers play a crucial role in the formation of intracellular neurofibrillary tangles. They are intermediates between soluble tau monomers and insoluble tau filaments and are suspected contributors to disease pathogenesis. Oligomeric tau can be released into the extracellular space and spread throughout the brain. This finding opens the question of whether brain macrophages or blood monocytes have the potential to phagocytose extracellular oligomeric tau. METHODS: We have used stable rat primary microglial cells, rat peripheral monocytes-derived macrophages, BV2 microglial and TIB67 macrophage immortalized cell lines that were challenged by tau oligomers prepared by an in vitro aggregation reaction. The efficiency of cells to phagocytose oligomeric protein was evaluated with confocal microscopy. The ability to degrade tau protein was analyzed by immunoblotting. RESULTS: Confocal microscopy analyses showed that macrophages were significantly more efficient in phagocytosing oligomerized tau proteins than microglial cells. In contrast to macrophages, microglia are able to degrade the internalized oligomeric tau only after stimulation with lipopolysaccharide (LPS). CONCLUSIONS: Our data suggests that microglia may not be the principal phagocytic cells able to target extracellular oligomeric tau. We found that peripheral macrophages display a high potency for elimination of oligomeric tau and therefore could play an important role in the modulation of neurofibrillary pathology in Alzheimer's disease.

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Authors
Majerova, P., Zilkova, M., Kazmerova, Z., Kovac, A., Paholikova, K., Kovacech, B., Zilka, N., & Novak, M.
Affiliations
  • AXON Neuroscience (Slovakia) (SK)
  • Slovak Academy of Sciences (SK)
Venue
Journal of Neuroinflammation
Published
2014-09-13
Volume
11
Issue
1
Pages
161-161
ISSN
1742-2094 (ISSN-L)
OpenAlex
W2165081954
Cited by
90
References
84
Citations by year
2026: 3 · 2025: 7 · 2024: 10 · 2023: 9 · 2022: 7 · 2021: 12 · 2020: 13 · 2019: 8 · 2018: 6 · 2017: 3 · 2016: 5 · 2015: 7
FWCI
3.32
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroinflammation (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
Agentúra na Podporu Výskumu a Vývoja (APVV-0200-11)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
Keywords
tau oligomers, microglia, macrophages, phagocytosis, Alzheimer's disease, neurofibrillary tangles, extracellular tau, lipopolysaccharide, tau degradation, peripheral blood monocytes, neuroinflammation
MeSH terms
Animals, Cells, Cultured, Extracellular Space, Humans, Macrophages, Mice, Inbred C57BL, Phagocytosis, Blotting, Western, tau Proteins, Rats, Sprague-Dawley, Microglia, Microscopy, Electron, Transmission, Mice, Rats, Protein Multimerization

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