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CXCL10 chemokine regulates heterogeneity of the CD8 T cell response and viral set point during chronic infection. | LitMetric
CD8 T cells responding to chronic infection adapt an altered differentiation program that provides some restraint on pathogen replication yet limits immunopathology. This adaptation is imprinted in stem-like cells and propagated to their progeny. Understanding the molecular control of CD8 T cell differentiation in chronic infection has important therapeutic implications. Here, we find that the chemokine receptor CXCR3 is highly expressed on viral-specific stem-like CD8 T cells and that one of its ligands, CXCL10, regulates the persistence and heterogeneity of responding CD8 T cells in spleens of mice chronically infected with lymphocytic choriomeningitis virus. CXCL10 is produced by inflammatory monocytes and fibroblasts of the splenic red pulp, where it grants stem-like cells access to signals promoting differentiation and limits their exposure to pro-survival niches in the white pulp. Consequently, functional CD8 T cell responses are greater in Cxcl10 mice and are associated with a lower viral set point.
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