Volume 8, Issue 2, Pages (August 2010)

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Volume 8, Issue 2, Pages 163-173 (August 2010) Fidelity of Pathogen-Specific CD4+ T Cells to the Th1 Lineage Is Controlled by Exogenous Cytokines, Interferon-γ Expression, and Pathogen Lifestyle  Meredith M. Curtis, Emily Rowell, Shahin Shafiani, Amina Negash, Kevin B. Urdahl, Christopher B. Wilson, Sing Sing Way  Cell Host & Microbe  Volume 8, Issue 2, Pages 163-173 (August 2010) DOI: 10.1016/j.chom.2010.07.006 Copyright © 2010 Elsevier Inc. Terms and Conditions

Figure 1 Type I IFNs and IL-12 Contribute to Th1 Stabilization among Endogenous Pathogen-Specific CD4+ T Cells (A) Representative FACS plots demonstrating IFN-γ and IL-17 production by CD4+ T cells from the indicated groups of mice. Splenocytes were harvested 28 days postinfection with LmΔactA-OVA and stimulated for 5 hr with LLO189-201 peptide. (B) Representative FACS plots showing percent IFN-γ and IL-17 production by Lm-specific CD4+ T cells after restimulation with LLO189-201 following culture in the indicated cell-polarizing conditions for 5 days. Cell Host & Microbe 2010 8, 163-173DOI: (10.1016/j.chom.2010.07.006) Copyright © 2010 Elsevier Inc. Terms and Conditions

Figure 2 Pathogen-Specific CD4+ T Cells Primed by Lm or LCMV Are Heritably Committed to the Th1 Lineage (A) CFSE-labeled CD4+ T cells from P25 TCR or SMARTA TCR transgenic mice were transferred into B6 control recipients that were subsequently infected with LmΔactA-85B or LCMV, respectively. Histograms display number of cell divisions among donor CD4+ T cells 7 days postinfection. (B) Representative FACS plots indicating IFN-γ, IL-17, IL-2, and TNF-α production by naive P25, or donor P25 or SMARTA CD4+ T cells recovered day 28 after infection and stimulation with cognate peptide directly ex vivo. (C) Representative FACS plots demonstrating IFN-γ and IL-17 production by donor P25 or SMARTA CD4+ T cells following culture in the indicated conditions for 5 days and restimulation with cognate peptide. Cell Host & Microbe 2010 8, 163-173DOI: (10.1016/j.chom.2010.07.006) Copyright © 2010 Elsevier Inc. Terms and Conditions

Figure 3 Type I IFNs and IL-12 Promote Th1 Commitment among Adoptively Transferred Pathogen-Specific CD4+ T Cells (A) CFSE-labeled CD4+ T cells from P25 TCR transgenic mice were transferred into B6 control (WT), IFNAR-p40 DKO, or IFN-γ KO recipients that were subsequently infected with LmΔactA-85B. Histograms display number of cell divisions among adoptive transferred CD4+ T cells 7 days postinfection. (B) Representative FACS plots indicating IFN-γ, IL-17, IL-2, and TNF-α production by P25 CD4+ T cells recovered day 28 after infection and stimulation with cognate peptide directly ex vivo. (C) Representative FACS plots demonstrating IFN-γ and IL-17 production by P25 CD4+ T cells primed in vivo with LmΔactA-85B following culture in the indicated conditions for 5 days and restimulation with cognate peptide. Cell Host & Microbe 2010 8, 163-173DOI: (10.1016/j.chom.2010.07.006) Copyright © 2010 Elsevier Inc. Terms and Conditions

Figure 4 Lm Restricted from the Cell Cytoplasm Primes Pathogen-Specific CD4+ T Cells with Plasticity for IL-17 Production (A) CFSE-labeled P25 CD4+ T cells were transferred into B6 control (WT) or IFN-γ-deficient recipients and subsequently infected with LmΔLLOΔPLC-85B (vacuolar Lm). Histograms display number of cell divisions among donor CD4+ T cells 7 days postinfection. (B) Representative FACS plots indicating IFN-γ, IL-17, IL-2, and TNF-α production by P25 CD4+ T cells recovered day 28 after infection and stimulation with cognate peptide directly ex vivo. (C) Representative FACS plots demonstrating IFN-γ and IL-17 production by donor P25 CD4+ T cells primed in vivo with LmΔLLOΔPLC-85B following culture in the indicated conditions for 5 days and restimulation with cognate peptide. Cell Host & Microbe 2010 8, 163-173DOI: (10.1016/j.chom.2010.07.006) Copyright © 2010 Elsevier Inc. Terms and Conditions

Figure 5 Impacts of Differentiation on CD4+ T Cell Protective Potency Recoverable pathogen burden in the lung day 28 after aerosol infection with 102 MTb in mice transferred P25 cells (5 × 105) 1 day prior to infection or no cell transfer control. “Plastic” and Th17-polarized cells were recovered from mice infected with vacuolar LmΔLLOΔPLC-85B and cultured under neutral (Tn) or Th17 conditions, respectively, for 5 days as described in the Experimental Procedures. Th1 cells were recovered from mice infected with cytoplasmic LmΔactA-85B and cultured under neutral (Tn) conditions. ∗∗p < 0.01. Cell Host & Microbe 2010 8, 163-173DOI: (10.1016/j.chom.2010.07.006) Copyright © 2010 Elsevier Inc. Terms and Conditions

Figure 6 Previous Ifng Expression Marks Th1-Committed Cells (A) P25 × Yeti CD4+ T cells were transferred into control B6 recipients 24 hr prior to infection with cytosolic or vacuolar Lm-Ag85B. Histograms represent percent donor cells that express Ifng (YFP+) directly ex vivo day 28 after infection. (B) Representative FACS plots demonstrating IFN-γ and IL-17 production or YFP expression by cytosolic Lm or vacuolar Lm-primed CD4+ T cells after stimulation with cognate peptide directly ex vivo. (C) Representative FACS plots (top) and composite bar graphs (bottom) demonstrating IFN-γ and IL-17 production by YFP− or YFP+ donor memory cells after culture in the indicated conditions for 5 days and restimulation with cognate peptide. Bar, one standard deviation. Cell Host & Microbe 2010 8, 163-173DOI: (10.1016/j.chom.2010.07.006) Copyright © 2010 Elsevier Inc. Terms and Conditions

Figure 7 Histone Modifications at the Ifng Locus Coincide with Th1 Differentiation Stability (A) P25 CD4+ T cells were transferred into B6 control recipients that were infected with cytosolic or vacuolar Lm. Donor CD4+ T cells were harvested at day 7 and sorted based on YFP expression. Histograms indicate gates used to sort YFP+ and YFP− donor CD4+ T cells. (B) Representative plots indicating IFN-γ, IL-17, IL-2, and TNF-α production by cytosolic or vacuolar Lm-primed effector CD4+ T cells after stimulation with cognate peptide directly ex vivo. (C) Bar graphs indicate expression of Ifng, Il17a, and Il17f by cytosolic or vacuolar Lm-primed CD4+ T cells purified based on YFP expression. (D) Bar graphs display enrichment of H3K4Me2 and H3K27Me3 normalized to total histone H3 at the Ifng and Il17a promoters. Day 7 YFP+ and YFP− P25 cells from mice infected with cytosolic (Cyto) or vacuolar (Vac) Lm are plotted for comparison with Th1 and Th17 cells generated by culturing naive P25 cells under the respective polarizing conditions for 5 days in vitro. Representative graphs from one of three independent experiments are shown depicting the average and standard deviation of three technical replicates. Bar, one standard deviation. Cell Host & Microbe 2010 8, 163-173DOI: (10.1016/j.chom.2010.07.006) Copyright © 2010 Elsevier Inc. Terms and Conditions