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- W2061718713 abstract "Chemokines and their receptors play a critical role in orchestrating immunity to microbial pathogens, including the orally acquired Th1-inducing protozoan parasite Toxoplasma gondii. Chemokine receptor CXCR3 is associated with Th1 responses, and here we use bicistronic CXCR3-eGFP knock-in reporter mice to demonstrate upregulation of this chemokine receptor on CD4+ and CD8+ T lymphocytes during Toxoplasma infection. We show a critical role for CXCR3 in resistance to the parasite in the intestinal mucosa. Absence of the receptor in Cxcr3−/− mice resulted in selective loss of ability to control T. gondii specifically in the lamina propria compartment. CD4+ T cells were impaired both in their recruitment to the intestinal lamina propria and in their ability to secrete IFN-γ upon stimulation. Local recruitment of CD11b+Ly6C/G+ inflammatory monocytes, recently reported to be major anti-Toxoplasma effectors in the intestine, was not impacted by loss of CXCR3. However, inflammatory monocyte activation status, as measured by dual production of TNF-α and IL-12, was severely impaired in Cxcr3−/− mice. Strikingly, adoptive transfer of wild-type but not Ifnγ−/− CD4+ T lymphocytes into Cxcr3−/− animals prior to infection corrected the defect in inflammatory macrophage activation, simultaneously reversing the susceptibility phenotype of the knockout animals. Our results establish a central role for CXCR3 in coordinating innate and adaptive immunity, ensuring generation of Th1 effectors and their trafficking to the frontline of infection to program microbial killing by inflammatory monocytes." @default.
- W2061718713 created "2016-06-24" @default.
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- W2061718713 date "2013-10-10" @default.
- W2061718713 modified "2023-09-26" @default.
- W2061718713 title "CXCR3-Dependent CD4+ T Cells Are Required to Activate Inflammatory Monocytes for Defense against Intestinal Infection" @default.
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- W2061718713 doi "https://doi.org/10.1371/journal.ppat.1003706" @default.
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