Cited by 98Parkinson's Disease Mechanisms and TreatmentsNeuroinflammation and Neurodegeneration MechanismsRedox biology and oxidative stress

Integrin CD11b mediates α-synuclein-induced activation of NADPH oxidase through a Rho-dependent pathway

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Hou, Liyan, Bao, Xiuqi, Zang, Caixia, Yang, Hanyu, Sun, Fuqiang, Che, Yuning, Wu, Xuefei, Li, Shao +2 more·2018·Redox Biology

Abstract

The activation of microglial NADPH oxidase (NOX2) induced by α-synuclein has been implicated in Parkinson's disease (PD) and other synucleinopathies. However, how α-synuclein activates NOX2 remains unclear. Previous study revealed that both toll-like receptor 2 (TLR2) and integrin play important roles in α-synuclein-induced microglial activation. In this study, we found that blocking CD11b, the α chain of integrin α M β 2 , but not TLR2 attenuated α-synuclein-induced NOX2 activation in microglia. The involvement of CD11b in α-synuclein-induced activation of NOX2 was further confirmed in CD11b -/- microglia by showing reduced membrane translocation of NOX2 cytosolic subunit p47 phox and superoxide production. Mechanistically, α-synuclein bound to CD11b and subsequently activated Rho signaling pathway. α-Synuclein induced activation of RhoA and downstream ROCK but not Rac1 in a CD11b-dependent manner. Moreover, siRNA-mediated knockdown of RhoA impeded NOX2 activation in response to α-synuclein. Furthermore, we found that inhibition of NOX2 failed to interfere with the activation of RhoA signaling and interactions between α-synuclein and CD11b, further confirming that NOX2 was the downstream target of CD11b. Finally, we found that genetic deletion of CD11b abrogated α-synuclein-induced NOX2 activatoin in vivo . Taken together, our results indicated that integrin CD11b mediates α-synuclein-induced NOX2 activation through a RhoA-dependent pathway, providing not only a novel mechanistic insight but also a new potential therapeutic target for synucleinopathies.

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Crossref · 10.1016/j.redox.2017.11.010

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  • Extracellular α-synuclein induces microglial ROS production through CD11b integrin-mediated NOX activation via RhoA.

    “With respect to microglial activation and neuroinflammation in PD, extracellular α-synuclein has been found to induce microglial ROS production through CD11b integrin-mediated NOX activation via RhoA [176].”

    From RhoA Signaling in Neurodegenerative Diseases (2022) · cites this paper as [176]

  • α-Syn has been shown to increase the expression of COX-2 and the activity of microglial NADPH oxidase via CD11b.

    “Moreover, α-Syn has been shown to increase the expression of COX-2 [116] and the activity of microglial NADPH oxidase via CD11b [117].”

    From Beneficial Effects of Spirulina Consumption on Brain Health (2022) · cites this paper as [117]

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Authors
Hou, L., Bao, X., Zang, C., Yang, H., Sun, F., Che, Y., Wu, X., Li, S., Zhang, D., & Wang, Q.
Affiliations
  • Dalian Medical University (CN)
  • Chinese Academy of Medical Sciences & Peking Union Medical College (CN)
Corresponding author
  • Zhang, Dan
  • Wang, Qingshan
Venue
Redox Biology
Publisher
Elsevier BV
Published
2018-04
Volume
14
Pages
600-608
ISSN
2213-2317 (ISSN-L)
OpenAlex
W2767563688
Cited by
98
References
45
Citations by year
2026: 6 · 2025: 8 · 2024: 19 · 2023: 10 · 2022: 15 · 2021: 17 · 2020: 11 · 2019: 8 · 2018: 4
FWCI
4.38
Type
journal article
Language
en
Open access
Locations
  • Redox Biology (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Chinese Academy of Meteorological Sciences (2016-I2M-3–011)
  • Dalian Medical University (201122)
  • National Natural Science Foundation of China (81703264, 81630097, 81773718)
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
CD11b, Mac-1, alpha-synuclein, NADPH oxidase NOX2, RhoA signaling, rocks, microglial activation, superoxide production, p47phox translocation, Parkinson's disease, synucleinopathies, TLR2
MeSH terms
NADPH Oxidase 2, Animals, Cells, Cultured, Humans, Inflammation, Male, Mice, Inbred C57BL, Signal Transduction, Microglia, rho GTP-Binding Proteins, rhoA GTP-Binding Protein, CD11b Antigen, Mice, alpha-Synuclein

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