IL-2c treatment preferentially expands injurious Tbet+ Tregs and inflammatory macrophages (MΦ) in skeletal muscle during chronic T. gondii infection. IL-2c.

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IL-2c treatment preferentially expands injurious Tbet+ Tregs and inflammatory macrophages (MΦ) in skeletal muscle during chronic T. gondii infection. IL-2c treatment preferentially expands injurious Tbet+ Tregs and inflammatory macrophages (MΦ) in skeletal muscle during chronic T. gondii infection. T. gondii–infected mice were administered IL-2–anti–IL-2c treatment 24 d postinfection for 5 consecutive d. Mice were used for analysis 1 d following the final treatment (30 d postinfection). (A) Representative flow plots (left) and graphical summary (right) of skeletal muscle Treg (TCRβ+CD4+Foxp3+) expansion versus Tconv (TCRβ+CD4+Foxp3−). (B) Absolute number of skeletal muscle Tregs (left) and Ki67 expression in Tregs. (C) Representative flow plot of Tbet, CD25, and ICOS (color scale, mean fluorescence intensity [MFI]) expression in skeletal muscle Tregs 30 d postinfection with T. gondii (ME49). (D) Representative flow plot overlay (left) and graphical summary (right) of Tbet expression in skeletal muscle Tregs from PBS (black line) and IL-2c–treated (blue line) mice versus Tbet-Ab isotype control (displayed in gray). (E) Representative flow plot (left) and graphical summary (right) of skeletal muscle macrophage (CD45+CD11b+Ly6g−CD68+) subsets by CD206 and Ly6c expression. (F) Absolute number of total MΦ, inflammatory MΦ (CD206loLy6chi), and restorative MΦ (CD206hiLy6clo). (G) Quantification of iNOS expression by flow cytometric analysis in inflammatory and restorative MΦ. Results are cumulative of n ≥ 2 independent experiments of n ≥ 4 mice per group per experiment; error bars represent SD. *p < 0.5, **p < 0.01, ***p < 0.001, ****p < 0.0001, Mann–Whitney U test (A, B, D, and G), Student t test (F), Kruskal–Wallis H test (E). Richard M. Jin et al. ImmunoHorizons 2018;2:142-154 Copyright © 2018 The Authors