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- W4313374702 abstract "Abstract CD8 T cell responses are essential for clearance of infections and tumors in the central nervous system (CNS). Under homeostatic conditions, T cell access to the CNS parenchyma is restricted. An intricate process of T cell reactivation by antigen presenting cells (APCs) at CNS barriers is thought to allow activated antigen-specific T cells to infiltrate the parenchyma during neurological disease. The role of CNS-resident APCs during CD8 T cell infiltration of the CNS parenchyma is unclear. We hypothesized that microglia and brain-associated macrophages (BAMs) are APCs critical for antigen specific CD8 T cell reactivation and CNS infiltration. To test this hypothesis, we generated mice with tamoxifen-inducible deletion of MHC class I on microglia and BAMs by crossing CX3CR1creER mice with H-2Db fl/fl mice (Db cKO). We challenged these mice with intracranial infection of Theiler’s murine encephalomyelitis virus (TMEV), which generates a robust CD8 T cell response against a Db restricted antigen (VP2121–130) in the brain. At 7 days post infection (dpi), brain infiltrating Db:VP2-specific CD8 T cells were reduced in Db cKO mice compared to control, while peripheral priming of CD8 T cells was unaffected. Unexpectedly, inflammatory monocytes infiltrating the brain at 7 dpi were also reduced in Db cKO mice, indicating a role for microglia/BAMs and CD8 T cells in recruitment of inflammatory monocytes. Db cKO mice were able to clear virus, indicating functional antiviral responses against TMEV occur despite reduced immune infiltration. These results demonstrate that local antigen presentation by microglia and BAMs facilitates inflammatory monocyte recruitment and antigen-specific CD8 T cell responses in the brain after TMEV infection." @default.
- W4313374702 created "2023-01-06" @default.
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- W4313374702 date "2020-05-01" @default.
- W4313374702 modified "2023-10-16" @default.
- W4313374702 title "Antigen presentation by CNS-resident microglia and macrophages is required for antiviral CD8 T cell responses in the brain following CNS viral challenge" @default.
- W4313374702 doi "https://doi.org/10.4049/jimmunol.204.supp.75.9" @default.
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