Volume 9, Issue 4, Pages (October 1998)

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Volume 9, Issue 4, Pages 555-563 (October 1998) The Ets-1 Transcription Factor Is Required for the Development of Natural Killer Cells in Mice  Kevin Barton, Natarajan Muthusamy, Christopher Fischer, Chao-Nan Ting, Theresa L Walunas, Lewis L Lanier, Jeffrey M Leiden  Immunity  Volume 9, Issue 4, Pages 555-563 (October 1998) DOI: 10.1016/S1074-7613(00)80638-X

Figure 1 Ets-1 Expression in Splenic NK Cells and Generation of Ets-1−/− Mice (A) Immunoblot analysis of Ets-1 expression in wild-type thymocytes and purified DX5+CD3− splenic NK cells. Murine Ets-1 migrates as a doublet in SDS-PAGE analysis (arrows). (B) Generation of Ets-1-deficient mice. Top panels, schematic representation of the wild-type Ets-1 locus (top), the Ets-1 targeting vector (middle), and the targeted Ets-1 allele (bottom). The targeting vector contains the neomycin resistance (neo) and the herpes simplex virus thymidine kinase (HSV-tk) genes, both under the control of the PGK promoter. The 6.4 and 2.7 kb wild-type and 4.5 and 5.9 kb targeted alleles are shown by arrows. Bottom left, Southern analysis of wild-type (+/+) and Ets-1+/− (+/−) ES cells. Bottom right, Southern analysis of offspring from an Ets-1+/−Ets-1+/− mating. The positions of the wild-type (wt) and targeted (t) alleles are shown to the left of each blot. (C) Immunoblot analysis of Ets-1 expression in splenocytes from wild-type (+/+), heterozygous (+/−), and homozygous (−/−) Ets-1-deficient animals. Immunity 1998 9, 555-563DOI: (10.1016/S1074-7613(00)80638-X)

Figure 2 Lymphocyte Subsets in the Ets-1-Deficient Animals (A) B and T lymphocyte subsets in spleens and thymi of wild-type (+/+) and Ets-1-deficient (−/−) mice. Lymphocyte subsets were quantitated by flow cytometry with antibodies specific for CD4, CD8, IgM, and B220. The data represents lymphocyte numbers from four to seven animals in each group. (B) Flow cytometric analysis of splenic T cells (top), B cells (middle), and NK cells (bottom). Note the significant reduction in DX5+CD3− NK cells in the Ets-1−/− spleens. The percentage of cells in each quadrent is shown in each panel. (C) Numbers of DX5+CD3− splenocytes in wild-type (+/+) and Ets-1-deficient (−/−) spleens. Data is shown as mean ± SEM for at least seven animals in each group. (D) Serum IgM levels in age-matched wild-type (+/+) and Ets-1-deficient (−/−) mice. Immunity 1998 9, 555-563DOI: (10.1016/S1074-7613(00)80638-X)

Figure 3 NK Cytolytic Activity of Ets-1-Deficient Splenocytes In vitro cytotoxicity against YAC-1 (A) and β2m−/− lymphoid blasts (B) using unfractionated poly (I:C)-stimulated splenocytes. Cytotoxicity assays were performed at effector to target cell ratios (E:T) of 6.25:1 to 100:1. Data are presented as mean ± SEM for cells from three different animals in each group. Immunity 1998 9, 555-563DOI: (10.1016/S1074-7613(00)80638-X)

Figure 4 NK Cytolytic Activity of Purified DX5+CD3− Ets-1-Deficient NK Cells In vitro cytotoxicity against YAC-1 (A) and RMA-S (B) targets of purified poly (I:C)-stimulated DX5+CD3− splenic NK cells. Cytotoxicity assays were performed at effector to target cell ratios (E:T) of 0.15:1 to 2.5:1. Data in (A) is presented as mean ± SEM for cells from three different animals in each group. Data in (B) represents values from a single animal in each group. Immunity 1998 9, 555-563DOI: (10.1016/S1074-7613(00)80638-X)

Figure 5 IFNγ Production by Ets-1-Deficient Splenocytes Wild-type (+/+) or Ets-1-deficient (−/−) splenocytes were stimulated in vitro with poly (I:C) for 18 hr, and IFNγ was measured in culture supernatants by ELISA. Data is presented as mean ± SEM for cells from three different animals in each group. Immunity 1998 9, 555-563DOI: (10.1016/S1074-7613(00)80638-X)

Figure 6 In Vivo NK Cell Function in Ets-1-Deficient Mice (A) Photographs of representative wild-type (+/+) and Ets-1-deficient (−/−) mice following subcutaneous injection with 105 RMA-S tumor cells. Note the tumor in the right hindlimb of the Ets-1-deficient mouse, which is not seen in the wild-type mouse injected with the same cells. (B) Incidence of tumors following injection of wild-type n = 9 and Ets-1-deficient n = 7 mice with 105 RMA-S cells. Immunity 1998 9, 555-563DOI: (10.1016/S1074-7613(00)80638-X)

Figure 7 Cytokines and Cytokine Receptors and the NK Defect of Ets-1-Deficient Mice (A) Expression of cytokine and cytokine receptor mRNAs in Ets-1 deficient poly (I:C)-stimulated splenocytes as determined by ribonuclease protection assay. Values were normalized first to an internal GAPDH control in each sample and then to wild-type mRNA levels as described in Experimental Procedures. (B) Flow cytometric analysis of IL-2Rβ expression on CD8+ splenocytes from wild-type (+/+) and Ets-1-deficient (−/−) mice. (C) Effect of exogenous cytokines on the in vitro cytotoxicity of wild-type (+/+) or Ets-1-deficient (−/−) bone marrow. All assays utilized YAC-1 targets. Effector to target (E:T) ratios are shown. Data from two animals of each genotype are shown. (D) Effect of exogenous IL-12 on the in vitro cytotoxicity of wild-type (+/+) and Ets-1-deficient (−/−) splenocytes. Data from one animal of each genotype is shown. Immunity 1998 9, 555-563DOI: (10.1016/S1074-7613(00)80638-X)