1 Supplementary Information 2 3 Figure S1 CD4+ 98.4% FSC-H FSC-Hhi cells 86% FSC-H Vα2+Vβ5.1,5.2+ 75% Vα2 FITC PI FSC-H PI Live cells 96% PI SSC-H A CD4 Pac Blue Vβ5.1,5.2 PE Vα2 FITC CD8+ 99% CD8 AF700 Vβ5.1,5.2 PE Expression of CD44 % of Max % of Max D Expression of CD69 % of Max Expression of CD44 % of Max Expression of CD62L Expression of CD69 % of Max C Vα2+Vβ5.1,5.2+ 98.1% CD4+ T cells FSC-Hlo cells Expression of CD62L % of Max PI B CD8+ T cells FSC-Hlo cells 4 5 Figure S1: Phenotype of in vitro activated Th2 cells and CTL for in vivo adoptive transfer. 6 CD4+ and CD8+ T cells were isolated from LNs of OTII x B6-SJ or OTI mice, respectively, and 7 cultured with Ag-loaded DC and cytokines. Cell purity and activation were assessed by flow 8 cytometry before i.v. transfer. (A, B) Gating strategy to identify (A) live, activated CD4+ T cells 9 or (B) CD8+ T cells expressing the transgenic Vα2+Vβ5.1,5.2+ TCR. (C, D) Surface expression 10 of CD44, CD69 and CD62L on CD4+ and CD8+ T cells gated as in (A) and (B), respectively. 1 Figure S2 Total cells *** 1500 1000 500 0 HDM prime DT depletion HDM challenge + + + + + + 400 * ns ns 300 500 250 0 Th2 transfer + DT depletion OVA challenge + + + + + + + CD11c-DTR BMC ns + - CD11c-DTR BMC + + + + + C57 BMC + - + + C57 150 100 50 ** ns + + + + ns + + + + + + CD11c-DTR BMC C57 BMC ** ns 200 ns 200 100 + + C57 BMC ns ns 150 100 50 0 0 + + + *** 0 + + C57 BMC *** 200 ** 800 + + Cell number in BAL (x103) 750 Cell number in BAL (x103) *** T cells 0 + + CD11c-DTR BMC B 1200 *** Cell number in BAL (x103) Cell number in BAL (x103) 2000 E osinophils Cell number in BAL (x103) A Cell number in BAL (x103) 1 + + + + + + - CD11c-DTR BMC + + + + + C57 BMC + - + + C57 + + + + + + - CD11c-DTR BMC + + + + + C57 BMC + - + + C57 2 3 Figure S2: Airway inflammation in mice primed to HDM, or adoptively transferred with 4 OVA-specific Th2 cells, requires CD11c+ cells at the time of airway challenge 5 BM chimeras were generated using C57BL/6 recipients and CD11c-DTR or C57BL/6 BM 6 donor cells as indicated. Non-chimeric C57BL/6 mice were used as controls. Mice were treated 7 at the indicated times with 15 ng DT (Sigma, St Louis, MO) / g body weight to deplete CD11c+ 8 cells; successful depletion was checked in spleen, LN and lung at the end of experiment. Total 9 BAL cells were collected, counted, and the numbers of total cells, eosinophils and CD3+ T cells 10 was evaluated by flow cytometry. 11 (A) BM chimeric mice (BMC) were rested for 14 weeks after reconstitution, sensitized by i.p. 12 injection of 40 µg HDM in alum or alum only as indicated, and challenged i.n. on day 17 with 13 100 µg HDM. DT treatment was on day -1, 0 and +2 with respect to i.n. challenge; BAL was on 14 d 21. Data are from one experiment with 3-10 mice / group, average + SEM are shown. 2 1 (B) BM chimeric mice (BMC) were rested for 5 weeks after reconstitution, then injected with 2 Th2 cells and challenged i.n. with 100 µg OVA as in Figure 1C. DT treatment was on day -2, 0 3 and +2 with respect to i.n. challenge. Data are from one experiment with 3 – 7 mice /group, 4 average values + SEM are shown. 5 *p<0.05; **p<0.01; ***p<0.001; ns, not significant; as determined using a t test or ANOVA 6 with Bonferroni’s correction. 7 8 3 1 Figure S3 A SSC-A FSC-A FSC-A AM 72% FSC-A T cells 49% CD3 PE-Cy 7 Siglec F PE Eosinophils 64% SSC-A DAPI SSC-H FSC-H FSC-A Live cells 57% CD11c PerCP Cy5.5 SSC-A, SSC-H 96% FSC-A, FSC-H 96% SSC-A MHCII AF488 B DAPI 50.1% SSC-A FSC-H 95% 95% SSC-H FSC-A FSC-A 8.7% 18% CD4 PAC BLUE SSC-A CD8 PERCP CY5.5 Th2 + CTL treated CD4 PAC BLUE FSC-A 83.2% Host 16.8% Transferred CD45.1 APC CD4 PAC BLUE No cells transferred 99.6% Host 0.4% Transferred CD45.1 APC Day 1 FSC-H IL-13 DS Red CD4 FITC 15.4% FSC-A 7.9% IL-4 AmCyan Day 3 Vα2 APC IL-13 DS Red 79.1% CD3 PE-Cy7 SSC-A C IL-4 AmCyan 2 4 1 Figure S3: Flow cytometric identification of inflammatory cell populations in BAL and 2 lung. 3 (A) Gating strategy to identify inflammatory cell populations in BAL (Figure 1B and 1D). Cell 4 doublets were gated out using FSC-A vs FSC-H and SSC-A vs SSC-H; live cells were identified 5 on the basis of DAPI exclusion. Alveolar macrophages were FSC-Ahi and CD11c+. FSC-Alo 6 cells were sequentially gated to identify eosinophils (Siglec-F+ SSC-Ahi) and T cells (CD3+ 7 SSC-Alo). 8 (B) Gating strategy to identify adoptively transferred CD4+ Th2 cells in lung cell suspensions 9 (Figure 1D). Doublet exclusion and live cell identification were carried out, FSC-A/SSC-Alo-med 10 lymphocytes were then gated from live cells, and CD4+ cells further separated into CD45.1+ 11 adoptively transferred cells or CD45.1- host cells. Staining for a control mouse that did not 12 receive adoptively transferred T cells is shown as a comparison. 13 (C) Gating strategy to identify reporting of IL-4 and IL-13 production by adoptively transferred 14 CD4+ Th2 cells in lung (Figure 2). Doublet exclusion and live cell identification were carried 15 out as in (B), FSC-H/SSC-Alo-med CD3+ lymphocytes were then gated from live cells, and 16 adoptively transferred OVA-specific V2+ CD4+ T cells identified. AmCyan reports production 17 of IL-4 while DsRed reports IL-13; a population of cells expressing both reporters is also 18 evident. 19 5 1 Figure S4 CD11C PE-CY7 2.6% MHCII APC-CY7 86.3% 2.8% 77.5% CD103 PE-TEX RED 58.9% CD11C PECY7 0.6% CD11C PECY7 19.1% MHCII APC-CY7 75.2% 46.9% MHCII APC-CY7 53.1% SSC-H 96.4% II. SSC-A CD11B PERCP CY5.5 CD11C PE-CY7 3.3% I. CD11B PERCP CY5.5 A 20.7% CD103 PE-TEX RED CD64 APC 96.4% SSC-H 75.7% 19.2% MHCII PAC BLUE CD64 APC CD45.1 APC eFLUOR780 CD103 PE TEX RED 31% 67.8% C 99.9% DAPI SSC-A CD45.2 PE MHCII PAC BLUE SSC-H 49% 3 87.3% 13.1% 40% CD64 APC CD103 PE TEX RED CD45.1 APC eFLUOR780 SSC-H 4.8% CD11B PERCP CY5.5 99.7% CD11C PE CY7 EMPTY FITC 79.9% SSC-H SSC-H 2 49.1% 50.9% SSC-H 3.5% CD11C PE-CY7 EMPTY FL-1 4.1% CD11B PERCP CY5.5 B 31.7% 66.6% CD45.2 PE Figure S4: Identification of DC populations in the lung and MLN 6 1 (A) Gating strategy for lung DC populations in Figure 4. Doublet exclusion and live cell 2 identification were carried out as in Figure S3B. Two populations were identified on the basis of 3 SSC and CD11c expression. The CD11c+ SSC-Ahi population (I) contained a clear majority of 4 CD11b-CD103- alveolar macrophages with a few CD103+ or CD11b+ DC. The remaining 5 population (II) contained CD11c+MHC-IIhigh DC, which were then subtyped into CD103+ and 6 CD11b+ populations, with the latter further divided into CD64+ and CD64- cells. DC identified 7 in I and II were combined together to calculate total DC numbers. 8 (B) Gating strategy for lung DC in Figure 5. Doublet exclusion and live cell identification were 9 carried out as in Figure S3B. Autofluorescent cells were gated out on the basis of high FL1 10 signal. The remaining cells were gated to identify CD11c+MHC-IIhi DC, which were then 11 subtyped into CD103+, CD11b+CD64+ and CD11b+CD64- populations. Each DC subset was 12 further separated into CD45.1+ and CD45.2+ cells, of WT and bm-1 origin, respectively. 13 (C) Gating strategy for LN DC in Figure 5. Doublets were excluded on the basis of SSC-A/SSC- 14 H, and live cells identified by DAPI exclusion. Any autofluorescent cellular debris was 15 excluded on the basis of high FL1 signal. The CD11cintMHC-IIhi DC population, which contains 16 migratory DC, was identified and then subtyped into CD103+, CD11b+CD64+ and 17 CD11b+CD64- populations. Each DC subset was further separated into CD45.1+ and CD45.2+ 18 cells, of WT and bm-1 origin, respectively. 19 7