Up-regulation of NK Cell Activating Receptors Following Allogeneic Hematopoietic Stem Cell Transplantation under a Lymphodepleting Reduced Intensity Regimen.

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Up-regulation of NK Cell Activating Receptors Following Allogeneic Hematopoietic Stem Cell Transplantation under a Lymphodepleting Reduced Intensity Regimen is Associated with Elevated IL-15 Levels  Michael Boyiadzis, Sarfraz Memon, Jesse Carson, Kenton Allen, Miroslaw J. Szczepanski, Barbara A. Vance, Robert Dean, Michael R. Bishop, Ronald E. Gress, Frances T. Hakim  Biology of Blood and Marrow Transplantation  Volume 14, Issue 3, Pages 290-300 (March 2008) DOI: 10.1016/j.bbmt.2007.12.490 Copyright © 2008 American Society for Blood and Marrow Transplantation Terms and Conditions

Figure 1 Correlation of NK cell recovery with IL-15 during the post-transplant period. A) Time courses of NK levels (cells/μl) (white squares) and plasma IL-15 levels (pg/ml) (black circles). NK cells recover rapidly post transplant, reaching a peak at 1 month and declining to pretreatment levels for the first year post-transplant. The plasma levels of IL-15 in the peri-transplant period reached a peak at the day of transplant and declined sharply in the first month. B) Inverse relationship overall between NK cell numbers and plasma IL-15 levels at all time points in the first year. C) Strong inverse correlation between NK cell numbers and plasma IL-15 levels at 2 weeks post-transplant, a time when NK populations were rapidly recovering and IL-15 levels varied over a 10-fold range. Spearman non-parametric correlation r values are shown. Biology of Blood and Marrow Transplantation 2008 14, 290-300DOI: (10.1016/j.bbmt.2007.12.490) Copyright © 2008 American Society for Blood and Marrow Transplantation Terms and Conditions

Figure 2 IL-15 up-regulation of expression of activating receptors associated with increased NK activity. A) Contour plots of the expression of NKG2D and NCR receptors in normal donor NK cells cultured with IL-15. Activating receptor expression increased along with a shift toward increased expression of CD56. B) Overlay histograms illustrating increased expression of NKG2D and NCR receptors in both NK subsets when cultured with IL-15. Gray-filled histogram shows day 0 expression; black line indicates expression after 48 h culture; and gray line indicates isotype control. C) NK cytotoxicity on K562 targets after culture with IL-15. Culture of CD56-bead purified NK cells for 72 h with IL-15 (100ng/ml) increased cytotoxicity (lytic units) compared to NK cells prior to culture (∗P < .0001). Addition of neutralizing antibodies to activating receptors NKG2D, NKp30, or NKp46 individually or in combination reduces NK cytotoxicity compared to assays containing an isotype control antibody (∗∗ P < .01; ∗∗∗ P < .001 relative to IL-15). Biology of Blood and Marrow Transplantation 2008 14, 290-300DOI: (10.1016/j.bbmt.2007.12.490) Copyright © 2008 American Society for Blood and Marrow Transplantation Terms and Conditions

Figure 3 Expression of NK receptors during the first year post-transplant. Contour plots of gated NK cells from patient #14 over a time course of the first year post-transplant. At 1 month post-transplant, the proportion of CD56brightCD16– cells within the NK population increased. In addition, an overall increase in the expression of CD56 was observed on both NK subsets. Expression of the activating NKG2D, NKp30, and NKp46 receptors increased on NK cells in the early months post-transplant relative to that of the donor PBSC NK cells. The highest level (MFI) of activating receptor expression was found on cells that had up-regulated CD56 expression. Biology of Blood and Marrow Transplantation 2008 14, 290-300DOI: (10.1016/j.bbmt.2007.12.490) Copyright © 2008 American Society for Blood and Marrow Transplantation Terms and Conditions

Figure 4 Percentile plots of NK receptor expression in the first year post-transplant. Box plots of percentages of NK cells expressing each receptor, showing the median (central bar), 25th and 75th percentile (box) and 10th and 90th percentile (bar) from the patients. Wilcoxon paired signed rank P values comparing expression in donor PBSCT and at 1 and 3 months post-transplant are indicated. Biology of Blood and Marrow Transplantation 2008 14, 290-300DOI: (10.1016/j.bbmt.2007.12.490) Copyright © 2008 American Society for Blood and Marrow Transplantation Terms and Conditions

Figure 5 NK subset and receptor recovery. A) Stacked bar graph of the average number of CD56brightCD16– and CD56dim CD16+ NK cells/μl of peripheral blood in donor peripheral blood and in recipients post-transplant. At 1 month post-transplant the CD56brightCD16– subset (black bar) was disproportionately increased compared to the CD56dim CD16+ (white bar). Standard error bars for each subset are shown. B) Overlay histograms illustrating increased expression of activating receptors in both NK subsets in a representative patient (#2) at 1 and 3 months post-transplant. Gray filled histogram shows donor PBSC NK cells; black line shows 1 month post-transplant; thick black line shows 3 months post-transplant. C) Scatterplots of the expression of the activating receptors in NK subsets in donor PBSC and patient peripheral blood following transplant. Horizontal bars represent the median expression of the receptors in the donor group, and at 1 and 3 months post-transplant. Biology of Blood and Marrow Transplantation 2008 14, 290-300DOI: (10.1016/j.bbmt.2007.12.490) Copyright © 2008 American Society for Blood and Marrow Transplantation Terms and Conditions