CD8 signaling in microglia/macrophage M1 polarization in a rat model of cerebral ischemia
Open accessAbstract
Classical or M1 activity of microglia/macrophages has been described in several neurodegenerative and brain inflammatory conditions and has also been linked to expansion of ischemic injury in post-stroke brain. While different pathways of M1 polarization have been suggested to occur in the post-stroke brain, the precise underlying mechanisms remain undefined. Using a transient middle cerebral artery occlusion (MCAO) rat model, we showed a progressive M2 to M1 polarization in the perilesional brain region with M1 cells becoming one of the dominant subsets by day 4 post-stroke. Comparing key receptors involved in M1 polarization (CD8, IFNγR, Clec4, FcγR, TLR3 and TLR4) and their signal transducers (Syk, Stat1, Irf3, and Traf6) at the day 4 time point, we showed a strong upregulation of CD8 along with SYK transducer in dissected perilesional brain tissue. We further showed that CD8 expression in the post-stroke brain was associated with activated (CD68+) macrophages and that progressive accumulation of CD8+CD68+ cells in the post-stroke brain coincided with increased iNOS (M1 marker) and reduced Arg1 (M2 marker) expression on these cells. In vitro ligand-based stimulation of the CD8 receptor caused increased iNOS expression and an enhanced capacity to phagocytose E. coli particles; and interestingly, CD8 stimulation was also able to repolarize IL4-treated M2 cells to an M1 phenotype. Our data suggest that increased CD8 signaling in the post-stroke brain is primarily associated with microglia/macrophages and can independently drive M1 polarization, and that modulation of CD8 signaling could be a potential target to limit secondary post-stroke brain damage.
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CD8 has been found on microglia/macrophages after a stroke.
“it is important to note that CD4 can be upregulated on microglia during an human immunodeficiency virus infection 22 and CD8 has been found on microglia/macrophages after a stroke. 23”
From The MR1/MAIT cell axis enhances dystrophic neurite development in Alzheimer's disease (2025) · cites this paper as [23]
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Jeon, M.-T., Kim, K.-S., Kim, E. S., Lee, S., Kim, J., Hoe, H.-S., & Kim, D.-G. (2021) · Ageing Research Reviews · doi:10.1016/j.arr.2021.101333 · Cited by 76 · see citing works
The MR1/MAIT cell axis enhances dystrophic neurite development in Alzheimer's disease
Wyatt‐Johnson, S. K., Ackley, S., Warren, J., Priya, R., Wan, J., Liu, S., & Brutkiewicz, R. R. (2025) · Alzheimer's & Dementia · doi:10.1002/alz.14480 · Cited by 4 · see citing works
“23 How this might contribute to the reduced pathology in the MR1-deficient 5XFAD mice remains to be determined.”
- Authors
- Boddaert, J., Bielen, K., ’s Jongers, B., Manocha, E., Yperzeele, L., Cras, P., Pirici, D., & Kumar-Singh, S.
- Affiliations
- Antwerp University Hospital (BE)
- University of Medicine and Pharmacy of Craiova (RO)
- Venue
- PLOS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2018-01-17
- Volume
- 13
- Issue
- 1
- Pages
- e0186937
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC5771556
- OpenAlex
- W2786860261
- Cited by
- 54
- References
- 3
- Citations by year
- 2026: 3 · 2025: 5 · 2024: 3 · 2023: 6 · 2022: 9 · 2021: 9 · 2020: 9 · 2019: 8 · 2018: 2
- FWCI
- 3.15
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- PLoS ONE (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Figshare (submittedVersion, cc-by)
- Funders
- Universiteit Antwerpen (BOF/NOI/LP/DOCPRO 25813, BOF/NOI-FFP130265, GOA-s30729)
- Romanian National Authority for Research and Innovation (PN-II-RU-TE-2014-4-0582)
- Flemish Institute for Science and technology (IWT-SB111664)
- Flemish Fund for Scientific Research (FWO- SB151525)
- Topics
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
- Health Sciences › Medicine › Epidemiology › Acute Ischemic Stroke Management
- Keywords
- microglia, macrophages, M1 macrophage polarization, M2 polarization, cerebral ischemia, stroke, transient middle cerebral artery occlusion, Syk, inducible nitric oxide synthase, Arg1, phagocytosis, neuroinflammation
- MeSH terms
- Animals, Brain Ischemia, Disease Models, Animal, Female, Macrophages, Male, Cell Polarity, CD8 Antigens, Rats, Wistar, Microglia, Rats
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