CAR T‐cell generation in human PBMC‐transplanted mice

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CAR T‐cell generation in human PBMC‐transplanted mice CAR T‐cell generation in human PBMC‐transplanted mice AEx vivo generation of CAR T cells. Activated human PBMC were left untransduced or incubated with CD8‐LVCD19CAR at an MOI of 2. Five days later, expression of CD19‐CAR and CD8 was determined on CD3+ cells. Numbers indicate the percentage of cells in the respective gate.BExperimental outline for in vivo CAR generation. 1 × 107 human PBMC were engrafted into naïve NSG mice or NSG mice that had been intraperitoneally (i.p.) injected with 5 × 105 Raji cells (Raji+) 6 days before. One day later, 2 × 106 t.u. of CD8‐LVCD19CAR (filled circles) or CD8‐LVRFP (gray triangles) were i.p. injected, respectively. As further control, another group of mice received PBS (open circles). Seven days later, mice were sacrificed and organs and cells were removed for further analysis.CDetection of CAR T cells by vector copy numbers (VCN). Genomic DNA was isolated from peritoneal cavity, spleen, and blood cells. VCN were determined in technical duplicates by qPCR for two individual mice of each group. The presence of B cells in the transplanted PBMC is indicated below.D–FCells isolated from the peritoneal cavity (peritoneum), spleen, or blood were evaluated by flow cytometry for the percentages of human CD8+ in CD3+ cells (D), of CAR+ or RFP+ cells in the CD8+ and CD8− fractions, respectively (E), and of human CD19+ cells (F) within the fraction of human CD45+ cells. Representative density plots are shown for the peritoneal cells. The gating strategy is represented in Appendix Fig S1A.GMice were transplanted with B‐cell‐depleted human PBMC and then received CD8‐LVCD19CAR (filled circle) or PBS (open circle). As control, CD8‐LVCD19CAR or PBS was injected into mice transplanted with non‐depleted PBMC.Data information: Data represent mean ± SD for all groups (CD8‐LVCD19CAR: n = 6 (+Raji) and n = 4 (−Raji) in (D), n = 4 (−B‐cells) in (G); CD8‐LVRFP: n = 4; PBS: n = 4 in (G), all others n = 3). Statistical significance was determined using Mann–Whitney test; ns, not significant. Anett Pfeiffer et al. EMBO Mol Med. 2018;emmm.201809158 © as stated in the article, figure or figure legend