Volume 40, Issue 3, Pages (March 2014)

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Volume 40, Issue 3, Pages 400-413 (March 2014) Distinct Dendritic Cell Subsets Dictate the Fate Decision between Effector and Memory CD8+ T Cell Differentiation by a CD24-Dependent Mechanism  Taeg S. Kim, Stacey A. Gorski, Steven Hahn, Kenneth M. Murphy, Thomas J. Braciale  Immunity  Volume 40, Issue 3, Pages 400-413 (March 2014) DOI: 10.1016/j.immuni.2014.02.004 Copyright © 2014 Elsevier Inc. Terms and Conditions

Immunity 2014 40, 400-413DOI: (10.1016/j.immuni.2014.02.004) Copyright © 2014 Elsevier Inc. Terms and Conditions

Figure 1 Deficiency in CD103+ RDCs Impaired Anti-IAV CD8+ Teff Cell Accumulation in the Lungs but Not DLNs (A–D) Batf3−/− and B6 mice were infected with IAV and specific CD8+ T cells in the lungs (A and B) and DLNs (C and D) were enumerated over time after tetramer staining. (A and C) Representative flow analyses (left) and combined NP- and PA-specific tetramer+ CD8+ T total cell numbers (right) are depicted. (B and D) IFN-γ-secreting CD8+ T cells in the infected lung (B) and DLN (D) at d7 p.i. were identified after restimulation with IAV-infected BMDCs for 5 hr in vitro (n = 6–8 mice/genotype). (E and F) Langerin-DTR mice were depleted of CD103+ RDCs by i.n. administration of DTx (or control PBS) followed by IAV infection. At d7 p.i., specific CD8+ T cells in the inflamed lung (E) and the responding DLN (F) were enumerated as shown in (A) and (C) (n = 7–9). See also Figure S1. Immunity 2014 40, 400-413DOI: (10.1016/j.immuni.2014.02.004) Copyright © 2014 Elsevier Inc. Terms and Conditions

Figure 2 Egress and Initial Activation of CD8+ T Cells in the DLNs of Batf3−/− Mice (A) Tet+ CD8+ T cells in the circulation of infected Batf3−/− and B6 mice were enumerated over time. A representative FACS plot evaluated at d11 p.i. is shown (n = 8–10). (B and C) Congenic mice that had received CFSE-labeled OT-I cells (Thy1.1) were infected with IAV-OT-I. Division (CFSE dilution) (B) and accumulation of divided (CFSElo) (C) OT-I cells in the DLN were measured at d3.5 p.i. (n > 5). (D–F) At d3.5 p.i., divided OT-I cells in the DLNs were examined for surface marker and Granzyme B expression directly ex vivo and for IFN-γ expression after ex vivo cognate peptide restimulation (D), T-bet (E), and Blimp-1 (F) protein expression by flow cytometry (n = 4–6). (G) Gene expression profiles of endogenous CD8+ T cells activated in the WT (blue) or Batf3−/− (red) mice. At d5 p.i., activated (CD44hi) and naive (CD44lo/−) CD8+ T cells were sorted from the DLNs of infected mice. TBX21, PRDM1, GZMB, and IFNG gene expression was evaluated in total mRNA. Data represent at least two independent experiments of cells from pools of three to five mice prior to sorting. See also Figure S2. Immunity 2014 40, 400-413DOI: (10.1016/j.immuni.2014.02.004) Copyright © 2014 Elsevier Inc. Terms and Conditions

Figure 3 CD8+ T Cells Differentiated in the Absence of CD103+ RDCs Exhibit Central Memory-like T Cell Properties (A–C) At >d60 p.i., circulating specific CD8+ T cells in the blood of recovered mice were analyzed for their surface expression of CD62L (A), CCR7 (B), and IL-7Rα (C) (n = 5–8). (D and E) Frequency of Tet+ CD8+ T cells in the circulation over time (D) and in the DLN (left panel in E) and lung (right panel in E) at d65 p.i. (F) The frequency of CD62Lhi or CCR7hi CD8+ T cells was measured in the DLNs of recovered WT (blue) and Batf3−/− (red) mice at d65 p.i. (n = 5–8). See also Figure S3. Immunity 2014 40, 400-413DOI: (10.1016/j.immuni.2014.02.004) Copyright © 2014 Elsevier Inc. Terms and Conditions

Figure 4 Trafficking and Recall Response of CD8+ T Cells Primed by CD103+ and CD11bhi RDC Subsets and Costimulatory Molecule Expression (A–D) CFSE-labeled naive specific Cl−4 cells were stimulated in vitro with DLN-derived CD103+ or CD11bhi RDCs isolated at d3 p.i. of PR/8 IAV-infected mice (from n = 15–20 donors/sorting). After d4, the CFSElo cells were sorted, and equivalent cell numbers were individually transferred into Thy-mismatched recipient mice. For trafficking analyses, activated Cl−4 cells (1 × 104/mouse) were infused into d5 p.i. B/Lee IAV-infected mice and enumerated in the lungs and DLNs of the recipients 24 hr p.t. (A and B). To further analyze the trafficking of the Cl−4 cells after IAV challenge, in vitro activated Cl−4 cells were transferred into uninfected recipient mice and maintained in recipients for 7 days prior to infection with A/PR8 IAV. At d8 p.i., responding Cl−4 cells in the lungs and DLNs of the infected recipients were evaluated (C and D). Data represent at least two independent experiments with similar results (n = 4–6/group). (E) Expression level of markers by the RDC subsets after migration to the DLN is represented as the ratio of MFI of CD103+ RDCs relative to the MFI of CD11bhi RDCs. (F) CD24 mRNA in total RNA from the sorted CD103+ RDCs and CD11bhi RDCs isolated from the pooled DLNs (from n = 15–20 mice/sorting) was analyzed at d3 p.i. Data represent three independent experiments. See also Figure S4. Immunity 2014 40, 400-413DOI: (10.1016/j.immuni.2014.02.004) Copyright © 2014 Elsevier Inc. Terms and Conditions

Figure 5 Impact of CD24 Blockade on Anti-IAV CD8+ T Cell Responses In Vivo (A) To monitor the effect of CD24 blockade on early events during T cell activation in vivo, CFSE-labeled OT-I cells were transferred into B6 WT mice, infected with PR8-OT-I IAV 24 hr p.t. These infected recipients were infused i.p. with αCD24 mAb or IgG mAb at both d1 and d3 p.i. (B) Cell division (left) and the fraction (%) (middle) and total numbers (right) of divided OT-I cells were enumerated (n = 4–5 recipients). (C–E) At d7 p.i., the frequency and total numbers of IAV-responding lung and DLN CD8+ T cells was determined by IFN-γ secretion after infected BMDC restimulation ex vivo for 5 hr (C) and direct ex vivo analysis of tet+ (NP and PA) CD8+ T cells in the lungs (D) and DLNs (E). Data represent at least three individual experiments (n = 4–5 mice/group). (F) Requirement of CD24-expressed RDC subsets for full expansion of naive CD8+ T cells. CFSE-labeled naive Cl−4 cells were cocultured with sorted CD11bhi or CD103+ RDCs from d3 p.i. DLNs (n = 15–20 mice/sorting) in the presence (filled in red) or absence (white lines) of αCD24 mAb. At d4, the extent of cell division (left) and total divided Cl−4 cells (right) were examined. Data represent at least three independent experiments. See also Figure S5. Immunity 2014 40, 400-413DOI: (10.1016/j.immuni.2014.02.004) Copyright © 2014 Elsevier Inc. Terms and Conditions

Figure 6 Elevated CD24 Expression by DCs Enhances CD8+ T Cell Response and Promotes Lung Homing (A) Effect of in vitro CD24 blockade on αCD3-CD28 Ab-stimulated proliferation of dye-labeled Cl−4 cells or polyclonal CD8+ T cells (data not shown) as determined by CFSE dilution at d3 of culture. Data are representative of three independent experiments. (B and C) IAV-infected BMDCs were treated with blocking CD24 mAb prior to transfer into naive mice. At d7 after infected BMDC transfer, the frequency and total number of tet+ CD8+ T cells (B) and IFN-γ-secreting CD8+ T cells after ex vivo peptide restimulation (C) in the spleens were determined. (D) BMDCs overexpressing CD24 by retrovirus transduction (pCD24; Figures S6E and S6F and control vector BMDCs) were pulsed with OT-I peptide prior to coculture with naive OT-I cells (Thy1.1) for 4 days. Activated OT-I cells (5 × 104/mouse) were then transferred into d5 p.i. WT IAV-infected mice (Thy1.2). Accumulation of OT-I cells in the lungs and DLNs was evaluated 24 hr later. Data in (B)–(D) represent at least three independent experiments (n = 4–5 mice/group). See also Figure S6. Immunity 2014 40, 400-413DOI: (10.1016/j.immuni.2014.02.004) Copyright © 2014 Elsevier Inc. Terms and Conditions

Figure 7 CD24 Controls Naive CD8+ T Cell Fate Decision via RAGE Engagement (A–C) RDC subsets isolated from the lung (A) and DLN (B) at d3 p.i. were stained for cell-bound HMGB1. Shown are representative flow cytometric plots (left in A) and MFI (right in A and B; n = 4–5 mice/group). Migrant RDCs in the DLN at d3 p.i. were stained simultaneously with control and mAbs specific for HMGB1 and CD24 (C). Data are representative of three independent experiments. (D) CFSE-labeled OT-I cells were transferred into naive WT mice, which were subsequently infected with PR/8-OT-I IAV. αHMGB1 Ab was administered i.n. at d1 and d3, p.i. OT-I cell proliferation in the DLN was examined at d4 p.i. (n = 4–6 mice/group). (E) Naive Cl−4 cells were cocultured for 4 days with DLN-derived CD103+ RDCs in the presence or absence of αRAGE Ab. Activated Cl−4 cells (5 × 104/mouse) were transferred into d6 p.i., B/Lee-infected mice and Cl−4 cell accumulation in the lungs and DLNs was evaluated 24 hr later (n = 4–5 mice/group). Cl−4 cells activated by CD11bhi RDCs were used as controls. Data in (D) and (E) represent at least two independent experiments. (F) Mixed BM chimeric mice between WT and Ager−/− marrows (1:1) were generated and infected with PR/8. IAV-specific CD45 congenic memory CD8+ T cells were identified in the lungs and DLNs (left) and enumerated (right) at d60 p.i. Data represent at least two independent experiments (n = 4–6/expt). See also Figure S7. Immunity 2014 40, 400-413DOI: (10.1016/j.immuni.2014.02.004) Copyright © 2014 Elsevier Inc. Terms and Conditions