Cited by 68Neuroinflammation and Neurodegeneration MechanismsComplement system in diseasesEpilepsy research and treatment

Fosb gene products contribute to excitotoxic microglial activation by regulating the expression of complement C5a receptors in microglia: Fosb Regulates Expression of C5a Receptors

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Nomaru, Hiroko, Sakumi, Kunihiko, Katogi, Atsuhisa, Ohnishi, Yoshinori N., Kajitani, Kosuke, Tsuchimoto, Daisuke, Nestler, Eric J., Nakabeppu, Yusaku·2014·Glia

Abstract

The Fosb gene encodes subunits of the activator protein-1 transcription factor complex. Two mature mRNAs, Fosb and ΔFosb, encoding full-length FOSB and ΔFOSB proteins respectively, are formed by alternative splicing of Fosb mRNA. Fosb products are expressed in several brain regions. Moreover, Fosb-null mice exhibit depressive-like behaviors and adult-onset spontaneous epilepsy, demonstrating important roles in neurological and psychiatric disorders. Study of Fosb products has focused almost exclusively on neurons; their function in glial cells remains to be explored. In this study, we found that microglia express equivalent levels of Fosb and ΔFosb mRNAs to hippocampal neurons and, using microarray analysis, we identified six microglial genes whose expression is dependent on Fosb products. Of these genes, we focused on C5ar1 and C5ar2, which encode receptors for complement C5a. In isolated Fosb-null microglia, chemotactic responsiveness toward the truncated form of C5a was significantly lower than that in wild-type cells. Fosb-null mice were significantly resistant to kainate-induced seizures compared with wild-type mice. C5ar1 mRNA levels and C5aR1 immunoreactivity were increased in wild-type hippocampus 24 hours after kainate administration; however, such induction was significantly reduced in Fosb-null hippocampus. Furthermore, microglial activation after kainate administration was significantly diminished in Fosb-null hippocampus, as shown by significant reductions in CD68 immunoreactivity, morphological change and reduced levels of Il6 and Tnf mRNAs, although no change in the number of Iba-1-positive cells was observed. These findings demonstrate that, under excitotoxicity, Fosb products contribute to a neuroinflammatory response in the hippocampus through regulation of microglial C5ar1 and C5ar2 expression.

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Authors
Nomaru, H., Sakumi, K., Katogi, A., Ohnishi, Y. N., Kajitani, K., Tsuchimoto, D., Nestler, E. J., & Nakabeppu, Y.
Affiliations
  • Kyushu University (JP)
  • Icahn School of Medicine at Mount Sinai (US)
Corresponding author
Nakabeppu, Yusaku
Venue
Glia
Publisher
Wiley
Published
2014-06-18
Volume
62
Issue
8
Pages
1284-1298
ISSN
0894-1491 (ISSN-L)
OpenAlex
W1928647053
Cited by
68
References
64
Citations by year
2026: 5 · 2025: 1 · 2024: 6 · 2023: 12 · 2022: 8 · 2021: 5 · 2020: 7 · 2019: 5 · 2018: 3 · 2017: 5 · 2016: 6 · 2015: 5
FWCI
2.77
Type
journal article
Language
en
Open access
Locations
  • Glia (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Kyushu University Institutional Repository (QIR) (Kyushu University) (submittedVersion)
Funders
  • Japan Society for the Promotion of Science (10J00463, 22221004, 23657116)
  • National Institutes of Health (R01MH51399, P50MH096890)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
  • Health Sciences › Medicine › Psychiatry and Mental health › Epilepsy research and treatment
Keywords
FosB, ΔFosB, microglial activation, C5a receptor, C5aR1, C5aR2, excitotoxicity, kainate-induced seizures, neuroinflammation, hippocampus, chemotaxis, alternative splicing, interleukin-6, TNF-α
MeSH terms
CD68 Molecule, Animals, Astrocytes, Calcium-Binding Proteins, Cells, Cultured, Chemotaxis, Hippocampus, Kainic Acid, Male, Mice, Inbred C57BL, Microfilament Proteins, Neurons, RNA, Messenger, Seizures, Tumor Necrosis Factor-alpha, Antigens, Differentiation, Myelomonocytic, Antigens, CD, Interleukin-6, Proto-Oncogene Proteins c-fos, Alternative Splicing, Microglia, Mice, Knockout, Excitatory Amino Acid Agonists, Receptor, Anaphylatoxin C5a

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