Astrocytes Regulate Microglial Phagocytosis of Senile Plaque Cores of Alzheimer's Disease
Abstract
We have developed an in vitro model in which isolated senile plaque (SP) cores are presented to rat microglial cells in culture. Microglia rapidly phagocytosed, broke apart, and cleared SP cores. However, when cocultured with astrocytes, microglial phagocytosis was markedly suppressed, allowing the SPs to persist. Suppression of phagocytosis by astrocytes appears to be a general phenomena since microglia in the presence of astrocytes showed reduced capacity to phagocytose latex beads as well. The astrocyte effect on microglia is related in part to a diffusible factor(s) since astrocyte- but not fibroblast-conditioned media also reduced phagocytosis. These results suggest that while microglia have the capacity to phagocytose and remove SPs, astrocytes which lie in close association to microglia may help prevent the efficient clearance of SP material allowing them to persist in Alzheimer's disease.
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Astrocytes can modulate microglial responses to Aβ.
“Moreover, astrocytes can also modulate microglial responses to Aβ [55, 58, 59].”
From IL-1β-driven amyloid plaque clearance is associated with an expansion of transcriptionally reprogrammed microglia (2019) · cites this paper as [59]
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- Authors
- DeWitt, D. A., Perry, G., Cohen, M., Doller, C., & Silver, J.
- Affiliations
- Case Western Reserve University (US)
- Venue
- Experimental Neurology
- Publisher
- Elsevier BV
- Published
- 1998-02
- Volume
- 149
- Issue
- 2
- Pages
- 329-340
- ISSN
- 0014-4886 (ISSN-L)
- OpenAlex
- W2164956116
- Cited by
- 261
- References
- 69
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 6 · 2023: 11 · 2022: 6 · 2021: 12 · 2020: 3 · 2019: 7 · 2018: 8 · 2017: 6 · 2016: 12 · 2015: 13 · 2014: 11 · 2013: 8 · 2012: 13
- FWCI
- 6.82
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Experimental Neurology (publishedVersion)
- PubMed (publishedVersion)
- Scholars Crossing (Liberty University) (submittedVersion)
- Funders
- National Institutes of Health (5r01ag009287-08)
- National Institute on Aging (AG-00105-11A1, T32AG000105, AG 09287)
- National Institute of Neurological Disorders and Stroke (NS 25713)
- Topics
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
- Keywords
- astrocytes, microglia, phagocytosis, amyloid plaques, Alzheimer's disease, plaque clearance, astrocyte-microglia interaction, conditioned medium, diffusible factors, latex bead phagocytosis, fibroblasts
- MeSH terms
- Alzheimer Disease, Animals, Animals, Newborn, Astrocytes, Brain, Cells, Cultured, Cerebral Cortex, Frontal Lobe, Humans, Phagocytosis, Temporal Lobe, Rats, Sprague-Dawley, Microglia, Coculture Techniques, Rats, Plaque, Amyloid
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