J. Joseph Melenhorst, Phillip Scheinberg, Ann Williams, David R

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Alloreactivity Across HLA Barriers Is Mediated by Both Naïve and Antigen-Experienced T Cells  J. Joseph Melenhorst, Phillip Scheinberg, Ann Williams, David R. Ambrozak, Keyvan Keyvanfar, Melody Smith, J. Philip McCoy, Nancy F. Hensel, Daniel C. Douek, A. John Barrett  Biology of Blood and Marrow Transplantation  Volume 17, Issue 6, Pages 800-809 (June 2011) DOI: 10.1016/j.bbmt.2010.12.711 Copyright © 2011 Terms and Conditions

Figure 1 UCB CD4+ and CD8+ T cells contain a large alloreactive T cell population. A, Gating strategy. Live T cells were identified in a bivariate plot of CD14/CD19/ViViD versus CD3, and single cells were identified in a forward scatter-area versus forward scatter-height plot. Single intact lymphocytes were gated in a forward scatter-area versus side scatter-area plot, and CD4+ and CD8+ T cells were identified in the next plot. B, Reactivity of CD4+ and CD8+ T cells in 1 of 5 umbilical cord blood mononuclear cells. Responding T cells were identified as CD3+ T cells that had serially diluted CFSE and acquired CD38 expression. Note the lack of response in unstimulated cells and the reactivity of T cells with the positive control staphylococcus enterotoxin B (SEB). C, Summary of the reactivity of UCB T cells with allogeneic PBMCs. In this box-and-whiskers plot, the horizontal bar represents the median, the borders are the 25th (lower) and 75th percentiles, and the whiskers are the minimum and maximum values. Biology of Blood and Marrow Transplantation 2011 17, 800-809DOI: (10.1016/j.bbmt.2010.12.711) Copyright © 2011 Terms and Conditions

Figure 2 Adult donor memory T cell subsets respond to allogeneic target cells (PBMCs and T-APCs). Unfractionated PBMCs and purified naïve (N), central memory (CM), effector memory (EM), and effector (E) T cell subsets were primed for 8 days with irradiated allogeneic PBMCs and then restimulated with the original PBMCs for 6 hours to assess cytokine (IL-2/IFN-γ and/or TNF-α) production by the alloantigen-primed T cells. A, Reactivity of the primed donor CD4+ and CD8+ T cell fractions with allogeneic PBMCs showing allo-pMHC reactivity by all subfractions. Shown are the background-subtracted average and standard error of the mean (SEM) in each CD4+ (left) and CD8+ (right) T cell subset. B, Reactivity of the same primed donor T cells with allogeneic T-APCs demonstrating essentially the same reactivity pattern. Again, the average and SEM in each CD4+ (left) and CD8+ (right) T cell subset are shown. None of the donors had phenotypically effector CD4+ T cells. Biology of Blood and Marrow Transplantation 2011 17, 800-809DOI: (10.1016/j.bbmt.2010.12.711) Copyright © 2011 Terms and Conditions

Figure 3 Alloreactive T cell precursors are readily identifiable in both naïve and memory T cells directly ex vivo. A, Frequencies of CD4+ (top) and CD8+ T cells from 6 donors (denoted by numbers on the x-axis corresponding to subject numbers listed in Table 1) responding with HLA-mismatched target cells. The frequencies displayed are background-subtracted, that is, after correction for cytokine production in the absence of allogeneic stimulator cells. Responder CD8+ T cells were identified as cells producing TNF-α and/or IFN-γ, and responder CD4+ T cells as cells producing TNF-α and/or IL-2. B, A representative example of one such analysis demonstrating direct ex vivo cytokine production. Shown is the phenotype of CD4+ and CD8+ T cells from donor 11 as a density plot, with the phenotype of alloreacting T cells overlad in yellow. The figure shows that alloresponding CD4 T cells lack CD57 expression, and that the bulk of the responder cells express CD27 but lack CD45RO expression, indicative of their naïve nature. However, a smaller, but sizeable, fraction also expresses CD45RO, indicating that some CD4+ T cells responding to nonself MHC are contained in the memory (CD27+CD45RO+) pool. On the other hand, the majority of the alloreactive CD8+ T cells express CD57 but not CD27 or CD45RO, indicating that most alloreactive T cells originate from the end-stage effector pool. Biology of Blood and Marrow Transplantation 2011 17, 800-809DOI: (10.1016/j.bbmt.2010.12.711) Copyright © 2011 Terms and Conditions

Figure 4 Virus-specific CD4+ and CD8+ T cells recognize allogeneic pMHC. A, CD4+ and CD8+ T cells from donors 15, 19, and 33 responded to selected T-APCs with production of IL-2/IFN-γ and TNF-α. B, EBV and CMV pp65-specific T cells from donors 15 and 19 were sorted based on the expression of both TNF-alpha and IFN-gamma upon stimulation with cognate antigen or allogeneic target. The same T cell clone recognized both cognate antigens presented in self-MHC and allogeneic pMHC. Selected and expanded T cells were stimulated with cognate antigen or allogeneic T-APCs, stained for surface markers and cytokines, and sorted based on cytokine production. The TCR sequences were amplified in 3 separate polymerase chain reaction (PCR) tubes, each containing the full set of Vβ PCR primers but a different set of Jβ (BJ) primers. Tube A contained primers specific for TCRBJ 1.1–1.6; tube B contained primers specific for TCRBJ 2.1, 2.3, 2.4, and 2.5; and tube C contained primers specific for TCRBJ 2.2, 2.6, and 2.7. Given that we examined the TCR repertoire in 3 separate PCR reactions, we indicate clonal dominance per tube (A, B, and C). We obtained a total of 224 in-frame TCR sequences in this experiment, including 40 and 66 sequences for donor 15’s CD8+ T cell response against the cognate and alloantigen, respectively, and 56 and 62 sequences for donor 19’s CD4+ T cell response against the cognate and alloantigen, respectively. The clonotype composition in the sorted fraction shows identical clonotypes in the respective cell lines, indicated in matching colors for identical clonotypes. Biology of Blood and Marrow Transplantation 2011 17, 800-809DOI: (10.1016/j.bbmt.2010.12.711) Copyright © 2011 Terms and Conditions