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George TC, Ortaldo JR, Lemieux S, Kumar V, Bennett M. Tolerance and Alloreactivity of the Ly49D Subset of Murine NK Cells. THE JOURNAL OF IMMUNOLOGY 1999. [DOI: 10.4049/jimmunol.163.4.1859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Abstract
Class I-specific stimulatory and inhibitory receptors expressed by NK cell subsets contribute to the alloreactive potential of the self-tolerant murine NK cell repertoire. In this report, we have studied potential mechanisms of tolerance to the function of the positive signaling Ly49D receptor in mice that express one of its ligands, H2-Dd. Our results demonstrate that H2-Dd-expressing mice possess a large Ly49D+ subset of NK cells that is functionally capable of rejecting bone marrow cell (BMC) allografts in vivo and lysing allogeneic Con A lymphoblasts in vitro. Also, we show that the Ly49D receptor is responsible for the ability of H2b/d F1 hybrid mice to reject H2d/d parental BMC (hybrid resistance). Thus, deletion or anergy of Ly49D+ cells in H2-Dd+ hosts cannot explain self tolerance. Our functional studies revealed that coexpression of the Dd-specific Ly49A or Ly49G2 inhibitory receptors by Ly49D+ cells resulted in tolerance to Dd+ targets, while coexpression of Kb-specific inhibitory receptors Ly49C/I resulted in tolerance to Kb+ targets. Only in H2d/d cells did Ly49C/I dominantly inhibit Ly49D-Dd stimulation. This correlated with an increased mean fluorescence intensity of Ly49C expression, as well as an increased percentage of Ly49C+ cells in the Ly49D+A/G2− compartment. Therefore, we conclude that self tolerance of the Ly49D subset can be achieved through coexpression of a sufficient level of self-specific inhibitory receptors.
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Affiliation(s)
- Thaddeus C. George
- *Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75235
| | - John R. Ortaldo
- †Laboratory of Experimental Immunology, Division of Basic Sciences, National Cancer Institute, Frederick Cancer Research and Development Center, Frederick, MD 21702; and
| | - Suzanne Lemieux
- ‡Human Health Research Center, Institut National de la Reserche Scientifique-Institute Armand-Frappier, University of Quebec, Laval, Canada
| | - Vinay Kumar
- *Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75235
| | - Michael Bennett
- *Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75235
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Kung SKP, Su RC, Shannon J, Miller RG. The NKR-P1B Gene Product Is an Inhibitory Receptor on SJL/J NK Cells. THE JOURNAL OF IMMUNOLOGY 1999. [DOI: 10.4049/jimmunol.162.10.5876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
The mouse NKR-P1 family includes at least three genes: NKR-P1A, -B, -C. Neither surface expression nor function of the NKR-P1B gene product has previously been shown. Here, we demonstrate that the SJL/J allele of the NKR-P1B gene product is expressed on SJL/J NK cells, and is recognized by PK136 mAb. Interestingly, the same mAb does not recognize the NKR-P1B gene product of C57BL/6. We have also generated a novel mAb, 1C10, that recognizes an activation receptor on SJL/J NK cells. Activation of the NKR-P1B receptor-inhibited 1C10 mAb induced redirected lysis and recruited SHP-1, indicating that NKR-P1B is an inhibitory receptor. Therefore, the mouse NKR-P1 gene family, like the Ly49 family, includes both activation and inhibitory receptors.
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Affiliation(s)
- Sam K. P. Kung
- Department of Medical Biophysics, Ontario Cancer Institute, University of Toronto, Ontario, Canada
| | - Ruey-Chyi Su
- Department of Medical Biophysics, Ontario Cancer Institute, University of Toronto, Ontario, Canada
| | - John Shannon
- Department of Medical Biophysics, Ontario Cancer Institute, University of Toronto, Ontario, Canada
| | - Richard G. Miller
- Department of Medical Biophysics, Ontario Cancer Institute, University of Toronto, Ontario, Canada
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Bernard K, Cambiaggi A, Guia S, Bertucci F, Granjeaud S, Tagett R, N’Guyen C, Jordan BR, Vivier E. Engagement of Natural Cytotoxicity Programs Regulates AP-1 Expression in the NKL Human NK Cell Line. THE JOURNAL OF IMMUNOLOGY 1999. [DOI: 10.4049/jimmunol.162.7.4062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
NK cell cytotoxicity is a fast and efficient mechanism of target cell lysis. Using transcription analysis, such as multiplex messenger assays, we show here that natural cytotoxicity exerted by the human NKL cell line correlates with mRNA accumulation of very early activator protein (AP)-1 transcription factor genes such as JunB, FosB and c-Fos. In addition, DNA-binding activities of Jun-Fos heterodimers were observed by electrophoretic mobility shift assays during the course of natural cytotoxicity. Interaction between immunoglobulin-like transcript-2/leukocyte Ig-like receptor 1 on NKL cells and HLA-B27 on target cells leads to an impairment of NKL natural cytotoxicity, which correlates with an absence of JunB, FosB, and c-Fos transcription, as well as an absence of their DNA-binding activity. Our studies thus indicate that, despite the rapidity of NK cell-mediated lysis, AP-1 transcription factor is activated during the early stage of NK cell cytolytic programs and that engagement of NK cell inhibitory receptors for MHC class I molecules impairs the very early activation of AP-1.
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Affiliation(s)
- Karine Bernard
- *Centre d’Immunologie, Institut National de la Santé et de la Recherche Médicale (INSERM)/Centre National de la Recherche Scientifique (CNRS) de Marseille-Luminy, Marseille, France
| | - Anna Cambiaggi
- †Unité de Biologie Moléculaire du Gène, Institut Pasteur, Paris, France
| | - Sophie Guia
- *Centre d’Immunologie, Institut National de la Santé et de la Recherche Médicale (INSERM)/Centre National de la Recherche Scientifique (CNRS) de Marseille-Luminy, Marseille, France
| | - François Bertucci
- §Laboratoire de Biologie des Tuneurs, Institut Paoli-Calmettes, Marseille, France
| | - Samuel Granjeaud
- *Centre d’Immunologie, Institut National de la Santé et de la Recherche Médicale (INSERM)/Centre National de la Recherche Scientifique (CNRS) de Marseille-Luminy, Marseille, France
| | - Rebecca Tagett
- *Centre d’Immunologie, Institut National de la Santé et de la Recherche Médicale (INSERM)/Centre National de la Recherche Scientifique (CNRS) de Marseille-Luminy, Marseille, France
| | - Catherine N’Guyen
- *Centre d’Immunologie, Institut National de la Santé et de la Recherche Médicale (INSERM)/Centre National de la Recherche Scientifique (CNRS) de Marseille-Luminy, Marseille, France
| | - Bertrand R. Jordan
- *Centre d’Immunologie, Institut National de la Santé et de la Recherche Médicale (INSERM)/Centre National de la Recherche Scientifique (CNRS) de Marseille-Luminy, Marseille, France
| | - Eric Vivier
- *Centre d’Immunologie, Institut National de la Santé et de la Recherche Médicale (INSERM)/Centre National de la Recherche Scientifique (CNRS) de Marseille-Luminy, Marseille, France
- ‡Institut Universitaire de France; and
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George TC, Mason LH, Ortaldo JR, Kumar V, Bennett M. Positive Recognition of MHC Class I Molecules by the Ly49D Receptor of Murine NK Cells. THE JOURNAL OF IMMUNOLOGY 1999. [DOI: 10.4049/jimmunol.162.4.2035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Members of the murine Ly49 family of receptors have been shown to inhibit and activate NK cell function. Subsets of Ly49-expressing NK cells mediate the rejection of bone marrow cell allografts and the lysis of allogeneic lymphoblasts. In this report we have studied Ly49-mediated positive and negative signaling in an in vitro cytotoxicity assay using sorted NK cell subsets as effectors and a panel of 51Cr-labeled Con A lymphoblasts as targets in the presence or the absence of Abs to Ly49 and/or class I molecules. Our results demonstrate that the activating receptor Ly49D delivers stimulatory signals for target cell lysis upon interacting with H2-Dd, Dr, and Dsp2, but not H2b or H2k class I Ags. On the other hand, the inhibitory receptor Ly49G2 delivers negative signals for target cell lysis upon interacting with Dd, Dr, and H2k, but not H2b or Dsp2, class I Ags. Furthermore, Ly49-mediated negative signaling dominates Ly49D-mediated positive signaling. Thus, lysis of class I MHC-bearing targets by NK cells is not merely the consequence of the absence of an Ly49-mediated negative signal, but also requires positive recognition of class I molecules by certain Ly49 receptors. Activation of NK cells by nonself class I molecules was not predicted by the missing self hypothesis.
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Affiliation(s)
- Thaddeus C. George
- *Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75235; and
| | - Llewellyn H. Mason
- †Laboratory of Experimental Immunology, Division of Basic Sciences, National Cancer Institute, Frederick Cancer Research and Development Center, Frederick, MD 21702
| | - John R. Ortaldo
- †Laboratory of Experimental Immunology, Division of Basic Sciences, National Cancer Institute, Frederick Cancer Research and Development Center, Frederick, MD 21702
| | - Vinay Kumar
- *Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75235; and
| | - Michael Bennett
- *Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75235; and
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