Cited by 701Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsDementia and Cognitive Impairment Research

The role of microglia in amyloid clearance from the AD brain

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Lee, C. Y. Daniel, Landreth, Gary E.·2010·Journal of Neural Transmission

Abstract

Alzheimer's disease (AD), the most prominent cause of senile dementia, is clinically characterized by the extracellular deposition of beta-amyloid (Abeta) and the intracellular neurofibrillary tangles. It has been well accepted that AD pathogenesis arises from perturbation in the homeostasis of Abeta in the brain. Abeta is normally produced at high levels in the brain and cleared in an equivalent rate. Thus, even a moderate decrease in the clearance leads to the accumulation of Abeta and subsequent amyloid deposition. Microglia are the tissue macrophages in the central nervous system (CNS) and have been shown to play major roles in internalization and degradation of Abeta. Abeta exists in the brain both in soluble and in fibrillar forms. Microglia interact with these two forms of Abeta in different ways. They take up soluble forms of Abeta through macropinocytosis and LDL receptor-related proteins (LRPs) mediated pathway. Fibrillar forms of Abeta interact with the cell surface innate immune receptor complex, initiating intracellular signaling cascades that stimulate phagocytosis. Inflammatory responses influence the activation status of microglia and subsequently regulate their ability to take up and degrade Abeta. ApoE and its receptors have been shown to play critical roles in these processes. In this review, we will explore the mechanisms that microglia utilize to clear Abeta and the effectors that modulate the processes.

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Crossref · 10.1007/s00702-010-0433-4

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  • Restricting microglial Aβ uptake leads to increased cerebral Aβ levels.

    “Evidence for a important role of microglial phagocytosis comes from studies that show that restricting microglial A␤ uptake leads to increased cerebral A␤ levels (El Khoury et al., 2007;Lee and Landreth, 2010).”

    From PPARγ/RXRα-Induced and CD36-Mediated Microglial Amyloid-β Phagocytosis Results in Cognitive Improvement in Amyloid Precursor Protein/Presenilin 1 Mice (2012) · cites this paper as Lee and Landreth, 2010

    The Fibrillar Aβ clearance section reports that mice with inactive TLR4 had greater cortical and hippocampal Aβ burden, and that their microglia were less efficient at taking up Aβ. It describes reduced microglial clearance as the study authors’ proposed explanation, not an established causal finding, and notes differing results for TLR2-deficient mice. The claim states the causal relationship more definitively than this review does. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Microglial expression of receptors that promote clearance and phagocytosis of Aβ, such as CD36, TLR4, and TLR6, are mandatory for restricting amyloid plaque formation.

    “Microglial expression of receptors that promote the clearance and phagocytosis of A␤, such as CD36, TLR4, and TLR6 (Lee and Landreth, 2010), are mandatory for restricting amyloid plaque formation.”

    From PPARγ/RXRα-Induced and CD36-Mediated Microglial Amyloid-β Phagocytosis Results in Cognitive Improvement in Amyloid Precursor Protein/Presenilin 1 Mice (2012) · cites this paper as Lee and Landreth, 2010

    The Fibrillar Aβ clearance section identifies CD36, TLR4 and TLR6 in the microglial receptor complex involved in Aβ uptake and phagocytosis. It does not establish that expression of all three is mandatory for restricting plaques: it calls the effects of TLR inactivation on Aβ deposition confusing and reports differing outcomes across mouse models. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Microglia interacts with Aβ through a cell-surface receptor complex comprising CD36, α6β1 integrin, and CD47.

    “Thus, microglia interacts with A␤ through a recently characterized cell-surface receptor complex comprising CD36, ␣6␤1 integrin, and CD47 (Lee and Landreth, 2010).”

    From PPARγ/RXRα-Induced and CD36-Mediated Microglial Amyloid-β Phagocytosis Results in Cognitive Improvement in Amyloid Precursor Protein/Presenilin 1 Mice (2012) · cites this paper as Lee and Landreth, 2010

    The “Fibrillar Aβ clearance” section identifies CD36, α6β1 integrin, and CD47 as components of a microglial cell-surface receptor complex for fibrillar Aβ. The “Soluble Aβ clearance” section says soluble Aβ is taken up differently, so the claim is too broad when it says Aβ without specifying its fibrillar form. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Microglia facilitate Aβ clearance through phagocytosis and can also exacerbate neurodegeneration by driving persistent neuroinflammation.

    “For example, they facilitate the clearance of Aβ through phagocytosis42, yet they can also exacerbate neurodegeneration by driving persistent neuroinflammation43.”
  • Microglia dynamically interact with disease processes to influence AD progression.

    “Microglia, the innate immune cells of the brain, dynamically interact with these disease processes to influence AD progression.”

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Authors
Lee, C. Y. D., & Landreth, G. E.
Affiliations
Case Western Reserve University (US)
Corresponding author
Landreth, Gary E.
Venue
Journal of Neural Transmission
Published
2010-06-15
Volume
117
Issue
8
Pages
949-960
ISSN
  • 0300-9564 (ISSN-L)
  • 1435-1463
OpenAlex
W2038594716
Cited by
701
References
161
Citations by year
2026: 26 · 2025: 49 · 2024: 74 · 2023: 54 · 2022: 66 · 2021: 50 · 2020: 51 · 2019: 43 · 2018: 56 · 2017: 31 · 2016: 29 · 2015: 43 · 2014: 35 · 2013: 36 · 2012: 31
FWCI
3.02
Type
journal article
Language
en
Open access
Locations
  • Journal of Neural Transmission (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute on Aging (R01AG020202, R01AG030482, R01AG016740)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
microglia, amyloid-beta clearance, Alzheimer's disease, amyloid deposition, macropinocytosis, LDL receptor-related protein, phagocytosis, innate immune receptors, inflammation, microglial activation, apolipoprotein E, amyloid clearance
MeSH terms
Alzheimer Disease, Amyloid, Apolipoproteins E, Brain, Humans, Inflammation, Microglia

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