Cited by 105Neuroinflammation and Neurodegeneration MechanismsImmune Response and InflammationRedox biology and oxidative stress

MAC1 mediates LPS-induced production of superoxide by microglia: The role of pattern recognition receptors in dopaminergic neurotoxicity

Pei, Zhong, Pang, Hao, Qian, Li, Yang, Sufen, Wang, Tonggauang, Zhang, Wei, Wu, Xeufei, Dallas, Shannon +5 more·2007·Glia

Abstract

Microglia-derived superoxide is critical for the inflammation-induced selective loss of dopaminergic (DA) neurons, but the underlying mechanisms of microglial activation remain poorly defined. Using neuron-glia and microglia-enriched cultures from mice deficient in the MAC1 receptor (MAC1-/-), we demonstrate that lipopolysaccharide (LPS) treatment results in lower TNFalpha response, attenuated loss of DA neurons, and absence of extracellular superoxide production in MAC1-/- cultures. Microglia accumulated fluorescently labeled LPS in punctate compartments associated with the plasma membrane, intracellular vesicles, and the Golgi apparatus. Cytochalasin D (CD), an inhibitor of phagocytosis, blocked LPS internalization. However, microglia derived from Toll-like receptor 4 deficient mice and MAC1-/- mice failed to show a significant decrease in intracellular accumulation of labeled LPS, when compared with controls. Pretreatment with the scavenger receptor inhibitor, fucoidan, inhibited 79% of LPS accumulation in microglia without affecting superoxide, indicating that LPS internalization and superoxide production are mediated by separate phagocytosis receptors. Together, these data demonstrate that MAC1 is essential for LPS-induced superoxide from microglia, implicating MAC1 as a critical trigger of microglial-derived oxidative stress during inflammation-mediated neurodegeneration.

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Crossref · 10.1002/glia.20545

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  • Both in co-culture and in vivo, toxins associated with neurodegeneration cause CR3 stimulation by the DAMP HMGB1, which results in activation of NOX2 and production of O2•-.

    “Both in co-culture and in vivo, toxins associated with neurodegeneration, such as 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP), LPS and diesel exhaust particles, cause CR3 stimulation by the DAMP, high mobility group box 1 (HMGB1), which results in activation of NOX2 and production of O2•– [101,102,103].”

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Authors
Pei, Z., Pang, H., Qian, L., Yang, S., Wang, T., Zhang, W., Wu, X., Dallas, S., Wilson, B., Reece, J. M., Miller, D. S., Hong, J., & Block, M. L.
Affiliations
National Institutes of Health (US)
Corresponding author
Miller, David S.
Venue
Glia
Publisher
Wiley
Published
2007-07-30
Volume
55
Issue
13
Pages
1362-1373
ISSN
  • 0894-1491 (ISSN-L)
  • 1098-1136
OpenAlex
W2002174378
Cited by
105
References
59
Citations by year
2026: 1 · 2025: 2 · 2024: 3 · 2023: 2 · 2022: 8 · 2021: 5 · 2020: 6 · 2019: 4 · 2018: 4 · 2017: 9 · 2016: 6 · 2015: 6 · 2014: 7 · 2013: 5 · 2012: 6
FWCI
4.25
Type
journal article
Language
en
Open access
closed
Locations
  • Glia (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Environmental Health Sciences (1K99 ES 01549-01, K99 ES015409)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
Mac-1, LPS, microglia, superoxide, dopaminergic neurotoxicity, pattern recognition receptors, TLR4, scavenger receptors, fucoidan, phagocytosis, oxidative stress, neuroinflammation, TNF-α, Parkinson's disease
MeSH terms
NADPH Oxidase 2, Animals, Cells, Cultured, Dopamine, Female, Lipopolysaccharides, Male, Membrane Glycoproteins, Mice, Inbred C3H, Mice, Inbred C57BL, Neuroglia, Neurons, Neurotoxins, Superoxides, Macrophage-1 Antigen, Reactive Oxygen Species, Microglia, Mice, Knockout, NADPH Oxidases, Receptors, Scavenger, Receptors, Pattern Recognition, Toll-Like Receptor 4, Mice

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