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Fregonezi PA, Silva TG, Simões RT, Moreau P, Carosella ED, Kläy CP, Gonçalves MA, Soares EG, Souto F, Donadi EA, Soares CP. Expression of nonclassical molecule human leukocyte antigen-G in oral lesions. Am J Otolaryngol 2012; 33:193-8. [PMID: 21035918 DOI: 10.1016/j.amjoto.2010.08.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2009] [Revised: 08/05/2010] [Accepted: 08/10/2010] [Indexed: 11/26/2022]
Abstract
INTRODUCTION Human leukocyte antigen (HLA)-G is a nonclassic class I molecule that acts as a modulator of immune responses, and the expression of these molecules in virus-infected cells has been associated with subversion of the immune response. OBJECTIVE In this study, we performed a cross-sectional study, systematically comparing the expression of the HLA-G in benign, premalignant, and malignant oral lesions and correlating it with the presence of high-risk and low-risk human papillomavirus (HPV) types. SPECIMENS AND METHODS: Oral biopsies were collected from 51 patients and analyzed by immunohistochemistry using anti-HLA-G antibody. Human papillomavirus detection and typing from oral biopsies were obtained by polymerase chain reaction using GP5+/GP6+ and specific primers. RESULTS The 51 biopsies were stratified into 3 groups according to lesion grade: oral benign lesions (oral hyperplasia and papilloma, n = 16), oral premalignant lesions (oral leukoplakia with dysplasia and lichen planus, n = 17), and malignant lesions (oral squamous cell carcinoma, n = 18). Human leukocyte antigen-G overexpression was mainly observed in benign and premalignant oral lesions but was not related to HPV infection (P > .05). On the other hand, HPV DNA was detected in 24 (47%) oral lesions, mainly in benign and premalignant lesions, with the most frequent type detected being high-risk HPV type. CONCLUSION The HLA-G molecule was expressed in a significant number of benign oral lesions and was not correlated with HPV infection or oral cancer.
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Baudhuin J, Lesport E, Sousa S, Migraine J, Vigneron J, Lemaoult J, Carosella ED, Mooney N, Favier B. HLA-G inhibition of NK-cell cytolytic function is uncoupled from tumor cell lipid raft reorganization. Eur J Immunol 2012; 42:700-9. [PMID: 22144141 DOI: 10.1002/eji.201141930] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Revised: 10/14/2011] [Accepted: 11/28/2011] [Indexed: 11/10/2022]
Abstract
HLA-G is a non-classical HLA class I molecule with tolerogenic properties and restricted tissue distribution. The expression of HLA-G can be induced by tumors thus providing an efficient way to escape the anti-tumoral immune response. Although lipid rafts regulate diverse immunological mechanisms their relationship with HLA-G remains controversial. Our results show that HLA-G-mediated inhibition of both the interaction between NK and tumor cells, and of intracellular calcium flux in NK cells conjugated to their target cells were independent of lipid raft integrity. In addition, cytotoxicity assays indicated that HLA-G continued to efficiently inhibit NK-cell cytolytic function in several different tumor cells independently of lipid raft integrity. Confocal microscopy with 3D reconstruction combined with biochemical analysis showed that HLA-G was mainly localized outside the lipid rafts of tumor cells after cross-linking with specific antibody and remained excluded from lipid rafts during interaction with the ILT2 inhibitory receptor of NK cells. This study indicates that the inhibitory function of HLA-G is uncoupled from lipid raft organization, further distinguishing HLA-G from classical HLA molecules and providing novel information in the understanding of tumor immune escape mechanism mediated through HLA-G.
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Lesport E, Baudhuin J, Sousa S, LeMaoult J, Zamborlini A, Rouas-Freiss N, Carosella ED, Favier B. Inhibition of human gamma delta [corrected] T-cell antitumoral activity through HLA-G: implications for immunotherapy of cancer. Cell Mol Life Sci 2011; 68:3385-99. [PMID: 21337044 PMCID: PMC11114898 DOI: 10.1007/s00018-011-0632-7] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Revised: 01/17/2011] [Accepted: 01/27/2011] [Indexed: 01/24/2023]
Abstract
Vγ9Vδ2 T cells play a crucial role in the antitumoral immune response through cytokine production and cytotoxicity. Although the expression of the immunomodulatory molecule HLA-G has been found in diverse tumors, its impact on Vγ9Vδ2 T-cell functions remains unknown. Here we showed that soluble HLA-G inhibits Vγ9Vδ2 T-cell proliferation without inducing apoptosis. Moreover, soluble HLA-G inhibited the Vγ9Vδ2 T-cell production of IFN-γ induced by phosphoantigen stimulation. The reduction in Vγ9Vδ2 T-cell IFN-γ production was also induced by membrane-bound or soluble HLA-G expressed by tumor cell lines. Finally, primary tumor cells inhibited Vγ9Vδ2 T-cell proliferation and IFN-γ production through HLA-G. In this context, HLA-G impaired Vγ9Vδ2 T-cell cytotoxicity by interacting with ILT2 inhibitory receptor. These data demonstrate that HLA-G inhibits the anti-tumoral functions of Vγ9Vδ2 T cells and imply that treatments targeting HLA-G could optimize Vγ9Vδ2 T-cell-mediated immunotherapy of cancer.
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MESH Headings
- Antigens, CD/metabolism
- Apoptosis
- Blotting, Western
- Cell Cycle
- Cell Line, Tumor
- Cell Proliferation
- Cytotoxicity, Immunologic/immunology
- Enzyme-Linked Immunosorbent Assay
- Flow Cytometry
- HLA Antigens/metabolism
- HLA-G Antigens
- Histocompatibility Antigens Class I/metabolism
- Humans
- Immunotherapy
- Interferon-gamma/metabolism
- Leukocyte Immunoglobulin-like Receptor B1
- Lymphocyte Activation/immunology
- Melanoma/immunology
- Melanoma/metabolism
- Melanoma/therapy
- Membrane Glycoproteins/metabolism
- Receptors, Antigen, T-Cell, gamma-delta/antagonists & inhibitors
- Receptors, Antigen, T-Cell, gamma-delta/metabolism
- Receptors, Immunologic/metabolism
- Receptors, KIR2DL4/metabolism
- T-Lymphocytes/immunology
- T-Lymphocytes/metabolism
- T-Lymphocytes, Cytotoxic/immunology
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Lesport E, Baudhuin J, Sousa S, LeMaoult J, Zamborlini A, Rouas-Freiss N, Carosella ED, Favier B. Erratum to: Inhibition of human gamma delta T-cell antitumoral activity through HLA-G: implications for immunotherapy of cancer. Cell Mol Life Sci 2011. [DOI: 10.1007/s00018-011-0742-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Carosella ED, LeMaoult J. HLA-G: a look back, a look forward. Cell Mol Life Sci 2011; 68:337-40. [PMID: 21088981 PMCID: PMC11114643 DOI: 10.1007/s00018-010-0577-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2010] [Accepted: 10/22/2010] [Indexed: 01/03/2023]
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57
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Carosella ED, Gregori S, Rouas-Freiss N, LeMaoult J, Menier C, Favier B. The role of HLA-G in immunity and hematopoiesis. Cell Mol Life Sci 2011; 68:353-68. [PMID: 21116680 PMCID: PMC11114977 DOI: 10.1007/s00018-010-0579-0] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2010] [Accepted: 10/22/2010] [Indexed: 12/14/2022]
Abstract
The non-classical HLA class I molecule HLA-G was initially shown to play a major role in feto-maternal tolerance. Since this discovery, it has been established that HLA-G is a tolerogenic molecule which participates to the control of the immune response. In this review, we summarize the recent advances on (1) the multiple structures of HLA-G, which are closely associated with their role in the inhibition of NK cell cytotoxicity, (2) the factors that regulate the expression of HLA-G and its receptors, (3) the mechanism of action of HLA-G at the immunological synapse and through trogocytosis, and (4) the generation of suppressive cells through HLA-G. Moreover, we also review recent findings on the non-immunological functions of HLA-G in erythropoiesis and angiogenesis.
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Verloes A, Van de Velde H, LeMaoult J, Mateizel I, Cauffman G, Horn PA, Carosella ED, Devroey P, De Waele M, Rebmann V, Vercammen M. HLA-G expression in human embryonic stem cells and preimplantation embryos. THE JOURNAL OF IMMUNOLOGY 2011; 186:2663-71. [PMID: 21248264 DOI: 10.4049/jimmunol.1001081] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Human leukocyte Ag-G, a tolerogenic molecule that acts on cells of both innate and adaptive immunity, plays an important role in tumor progression, transplantation, placentation, as well as the protection of the allogeneic fetus from the maternal immune system. We investigated HLA-G mRNA and protein expression in human embryonic stem cells (hESC) derived from the inner cell mass (ICM) of blastocysts. hESC self-renew indefinitely in culture while maintaining pluripotency, providing an unlimited source of cells for therapy. HLA-G mRNA was present in early and late passage hESC, as assessed by real time RT-PCR. Protein expression was demonstrated by flow cytometry, immunocytochemistry, and ELISA on an hESC extract. Binding of HLA-G with its ILT2 receptor demonstrated the functional active status. To verify this finding in a physiologically relevant setting, HLA-G protein expression was investigated during preimplantation development. We demonstrated HLA-G protein expression in oocytes, cleavage stage embryos, and blastocysts, where we find it in trophectoderms but also in ICM cells. During blastocyst development, a downregulation of HLA-G in the ICM cells was present. This data might be important for cell therapy and transplantation because undifferentiated hESC can contaminate the transplant of differentiated stem cells and develop into malignant cancer cells.
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HoWangYin KY, Caumartin J, Favier B, Daouya M, Yaghi L, Carosella ED, LeMaoult J. Proper regrafting of Ig-like transcript 2 after trogocytosis allows a functional cell-cell transfer of sensitivity. THE JOURNAL OF IMMUNOLOGY 2011; 186:2210-8. [PMID: 21242521 DOI: 10.4049/jimmunol.1000547] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The acquisition by T cells of exogenous ligands originally expressed by APC has been already described. However, reports essentially focused on the outward signaling of acquired ligands and their effects on surroundings cells. We investigated the function of transferred receptors (not ligands) on the T cells that acquired them (not on cells they interact with). We show that inhibitory Ig-like transcript 2 receptors efficiently transfer from monocytes to autologous T cells by trogocytosis and integrate within the plasma membrane of the acquirer T cells. Furthermore, the acquired receptors can access compatible signaling machinery within acquirer T cells and use it to signal and alter the functions of their new host cells. These data are a formal demonstration that a transferred molecule may send signals to its new host cell. We also provide evidence that sensitivity to modulatory molecules can be acquired from other cells and introduce the notion of intercellular transfer of sensitivities.
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Bourguignon M, Yaghi L, Flajollet S, Radanne-Krawice I, Rouas-Freiss N, Lugrin D, Richalet JP, Carosella ED, Moreau P. Increased soluble human leukocyte antigen-G levels in peripheral blood from climbers on Mount Everest. Hum Immunol 2010; 71:1105-8. [PMID: 20732367 DOI: 10.1016/j.humimm.2010.08.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2010] [Revised: 07/23/2010] [Accepted: 08/16/2010] [Indexed: 01/12/2023]
Abstract
Soluble human leukocyte antigen-G (HLA-G) is involved in maternal-fetal tolerance, transplant acceptance, and tumor escape from immunosurveillance, operating by inhibiting activity of T, antigen presenting cells (APC), and natural killer (NK) cells. HLA-G gene expression is modulated in vitro after hypoxic conditions, a situation evidenced during pregnancy and tumor progression. In extreme altitude, mountaineers are in hypoxic conditions that generate physiologic adaptative responses, some of them giving rise to pathologic signs. We performed measurements of plasma soluble HLA-G in six climbers before departure of the expedition and during their ascent to and descent from summit of Mount Everest, and in 3 Sherpas at 5300-6400 m. We found that HLA-G levels are upregulated during the ascent with a unique pattern in comparison with angiogenic/lymphangiogenic factors. Our data suggest that HLA-G has to be taken into account in the mechanisms participating in adaptation to high altitudes and reinforce hypoxia as an important factor in the regulation of HLA-G expression.
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Aractingi S, Gluckman E, Le Goué C, Dubertret L, Carosella ED. Lymphocytes, cytokines and adhesion molecules in chronic graft versus host disease. Mol Pathol 2010; 49:M225-31. [PMID: 16696080 PMCID: PMC408064 DOI: 10.1136/mp.49.4.m225] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Aims-To determine which inflammatory and immune pathways are implicated in the development of chronic graft versus host disease (GvHD) and whether differences between these pathways are responsible for the different presentations of chronic GvHD.Methods-Biopsy specimens of diseased and normal skin were obtained from patients presenting with lichen planus-like and sclerodermatous type chronic GvHD. Expression of epidermal cytokines, adhesion molecules and lymphoid surface markers was analysed by means of immunohistochemistry. Apoptosis was detected using the in situ nick endlabelling method.Results-In both GvHD lesion types, CD8+ cells predominated in the epidermis, whereas CD4+ cells were the most prevalentin the dermis. Apoptotickeratinocytes were found in diseased skin only and Fas antibodies labelled a considerable number of keratinocytes. The epidermis in both types of lesions expressed interleukin (IL) 1alpha, tumour necrosis factor (TNF) alpha and intercellular adhesion molecule (ICAM)-1, but dermal vascular cell adhesion molecule (VCAM)-1 expression was restricted to specimens of lichen planus-like GvHD. IL1alpha and E-selectin were expressed in normal looking skin of 55% and 80%, respectively, of patients with lichen planus-like GvHD.Conclusion-The similarity between expression of epidermal cytokines and adhesion molecules (with the exception of VCAM-1) and lymphocyte phenotype in lichen planus-like and sclerodermatous GvHD strongly suggests that the latter occurs as a consequence of the healing process. VCAM-1 distinguishes between lichen planus-like and sclerodermatous lesions. IL1alpha and E-selectin are potential early markers of chronic GvHD.
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HoWangYin KY, Alegre E, Daouya M, Favier B, Carosella ED, LeMaoult J. Different functional outcomes of intercellular membrane transfers to monocytes and T cells. Cell Mol Life Sci 2010; 67:1133-45. [PMID: 20238479 PMCID: PMC11115494 DOI: 10.1007/s00018-009-0239-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Revised: 11/23/2009] [Accepted: 12/18/2009] [Indexed: 02/07/2023]
Abstract
Trogocytosis is the uptake of membranes from one cell by another. Trogocytosis has been demonstrated for monocytes, B cells, T cells, and NK cells. The acquisition of the tolerogenic molecule HLA-G by T cells and NK cells makes them behave as regulatory cells. We investigated here whether HLA-G, which is expressed by tumor cells in vivo, could be acquired by monocytes and if this transfer could have functional consequences. We demonstrate that resting, and even more so, activated monocytes efficiently acquire membrane-bound HLA-G from HLA-G tumor cells by trogocytosis. However, we demonstrate that HLA-G quickly disappears from the surface of the monocytes in contrast to the HLA-G acquired by T cells. Consequently, HLA-G(acq+) monocytes do not reliably inhibit the on-going proliferation of autologous activated T cells and do not inhibit their cytokine production. Thus, we show that the acquirer cell may control the functional outcome of trogocytosis.
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Menier C, Rouas-Freiss N, Favier B, LeMaoult J, Moreau P, Carosella ED. Recent advances on the non-classical major histocompatibility complex class I HLA-G molecule. ACTA ACUST UNITED AC 2009; 75:201-6. [PMID: 20047640 DOI: 10.1111/j.1399-0039.2009.01438.x] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The human leukocyte antigen (HLA)-G non-classical major histocompatibility complex (MHC) class I molecule was originally described in first-trimester trophoblasts at the fetal-maternal interface in 1990. Eight years later, the First International Conference on this molecule was inaugurated by Prof Jean Dausset, recipient of the Nobel Prize in Medicine. The Fifth International Conference on HLA-G, held in Paris on July 2009, began with a tribute to Prof Jean Dausset who left us recently. This conference was co-chaired by Dr Edgardo D. Carosella and Prof Hans Grosse-Wilde, included 57 oral presentations and was attended by approximately 140 delegates from 16 countries. We summarize here the major advances on the HLA-G molecule that were reported, including findings on its biological activity and characterization of new mechanisms of action, notably through mesenchymal stem cells and regulatory cells, and the previously unexplored role of HLA-G on immune cells such as gammadelta T-cells and B lymphocytes. Furthermore, the role of HLA-G during pregnancy was revisited and its impact in pathologies such as cancer, autoimmune disorders and transplantation was further extended.
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Lesport E, Baudhuin J, LeMaoult J, Sousa S, Doliger C, Carosella ED, Favier B. Human melanoma cell secreting human leukocyte antigen–G5 inhibit natural killer cell cytotoxicity by impairing lytic granules polarization toward target cell. Hum Immunol 2009; 70:1000-5. [DOI: 10.1016/j.humimm.2009.07.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2009] [Revised: 07/27/2009] [Accepted: 07/29/2009] [Indexed: 10/20/2022]
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Michelin S, Gallegos CE, Dubner D, Favier B, Carosella ED. Ionizing radiation modulates the surface expression of human leukocyte antigen-G in a human melanoma cell line. Hum Immunol 2009; 70:1010-5. [PMID: 19665041 DOI: 10.1016/j.humimm.2009.07.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2009] [Revised: 07/31/2009] [Accepted: 07/31/2009] [Indexed: 01/21/2023]
Abstract
Human leukocyte antigen G (HLA-G) is a nonclassical HLA class I molecule involved in fetus protection from the maternal immune system, transplant tolerance, and viral and tumoral immune escape. Tumor-specific HLA-G expression has been described for a wide variety of malignancies, including melanomas. The aim of this study was to evaluate whether ionizing radiation (IR) could modulate the surface expression of HLA-G1 in a human melanoma cell line that expresses endogenously membrane-bound HLA-G1. For this purpose, cells were exposed to increasing doses of gamma-irradiation (0-20 Gy) and HLA-G1 levels at the plasma membrane were analyzed at different times postirradiation by flow cytometry. HLA-G total expression and the presence of the soluble form of HLA-G1 (sHLA-G1) in the culture medium of irradiated cells were also evaluated. IR was capable of downregulating cell surface and total HLA-G levels, with a concomitant increase of sHLA-G1 in the medium. These results could indicate that gamma-irradiation decreases HLA-G1 surface levels by enhancing the proteolytic cleavage of this molecule.
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Bahri R, Naji A, Menier C, Charpentier B, Carosella ED, Rouas-Freiss N, Durrbach A. Dendritic Cells Secrete the Immunosuppressive HLA-G Molecule upon CTLA4-Ig Treatment: Implication in Human Renal Transplant Acceptance. THE JOURNAL OF IMMUNOLOGY 2009; 183:7054-62. [DOI: 10.4049/jimmunol.0803054] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Flajollet S, Poras I, Carosella ED, Moreau P. RREB-1 is a transcriptional repressor of HLA-G. THE JOURNAL OF IMMUNOLOGY 2009; 183:6948-59. [PMID: 19890057 DOI: 10.4049/jimmunol.0902053] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The nonclassical HLA-G is a molecule specifically involved in immune tolerance with highly restricted tissue distribution in healthy conditions. Yet it is overexpressed in numerous tumors and in allografts with better acceptance. Major mechanisms involved in regulation of HLA-G transcription are still poorly described. Thus, to characterize these mechanisms we have developed a specific proteomic approach to identify proteins that bind differentially to the HLA-G gene promoter by promoter pull-down assay followed by spectrometry mass analysis. Among specific binding factors, we focused on RREB-1, a ras-responsive element binding protein 1. We demonstrated that RREB-1 represses HLA-G transcriptional activity and binds three ras response elements within the HLA-G promoter. RREB-1 protein, specifically in HLA-G-negative cells, interacts with subunits of CtBP complex implicated in chromatin remodeling. This demonstration is the first of a repressor factor of HLA-G transcriptional activity taking part in HLA-G repression by epigenetic mechanisms.
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Favier B, Lemaoult J, Lesport E, Carosella ED. ILT2/HLA-G interaction impairs NK-cell functions through the inhibition of the late but not the early events of the NK-cell activating synapse. FASEB J 2009; 24:689-99. [PMID: 19841038 DOI: 10.1096/fj.09-135194] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Natural killer (NK) cells play a crucial role in the antitumoral responses through cytolytic function and cytokine production. Expression of HLA-G at the surface of tumoral cells confers a protection against NK-cell cytolysis through its interaction with the ILT2 inhibitory receptor. Even though the role of this interaction on the inhibition of NK-cell cytotoxicity is well established, its effect on the molecular events occurring at the NK/target-cell synapse is not well characterized. We found that the interaction of the inhibitory receptor ILT2 with HLA-G inhibited the polarization of NK-cell lytic granules and the microtubule organizing center (MTOC) as well as the accumulation of filamentous actin (F-actin) at the area of contact. However, it did not affect the recruitment of the activatory receptor CD2 at the NK/target-cell interface. Even though CD2 was accumulated to the NK-cell synapse, the interaction of ILT2 with HLA-G efficiently inhibited intracellular calcium mobilization and IFN-gamma polarized production of NK cells. These results indicate that while the ILT2/HLA-G interaction leads to the inhibition of NK-cell functions, it displays differential effects on cytoskeleton reorganization and CD2 localization at the NK-cell synapse.-Favier, B., LeMaoult, J., Lesport, E., Carosella, E. D. ILT2/HLA-G interaction impairs NK-cell functions through the inhibition of the late but not the early events of the NK-cell-activating synapse.
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Castelli EC, Mendes-Junior CT, Deghaide NHS, de Albuquerque RS, Muniz YCN, Simões RT, Carosella ED, Moreau P, Donadi EA. The genetic structure of 3′untranslated region of the HLA-G gene: polymorphisms and haplotypes. Genes Immun 2009; 11:134-41. [DOI: 10.1038/gene.2009.74] [Citation(s) in RCA: 158] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Carosella ED. Trends in HLA-G research. Editorial. Hum Immunol 2009; 70:965. [PMID: 19665042 DOI: 10.1016/j.humimm.2009.07.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2009] [Revised: 07/31/2009] [Accepted: 07/31/2009] [Indexed: 10/20/2022]
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LeBouder F, Khoufache K, Menier C, Mandouri Y, Keffous M, Lejal N, Krawice-Radanne I, Carosella ED, Rouas-Freiss N, Riteau B. Immunosuppressive HLA-G molecule is upregulated in alveolar epithelial cells after influenza A virus infection. Hum Immunol 2009; 70:1016-9. [PMID: 19664669 DOI: 10.1016/j.humimm.2009.07.026] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2009] [Revised: 07/29/2009] [Accepted: 07/30/2009] [Indexed: 01/08/2023]
Abstract
Influenza virus type A (IAV) infections constitute an important economic burden and raise health-care problems. Host defense mechanisms usually clear IAV infections after a few days by exploiting a variety of cellular immune responses. However, increasing the production of immunosubversive molecules is a mechanism by which viruses escape host surveillance. In this regard, the nonclassical HLA class I molecule HLA-G displays strong tolerogenic properties. We show here that several strains of IAV differently upregulate HLA-G expression, at both the mRNA and protein levels, in alveolar epithelial cells. Thus the virulence of IAV may be caused by the capability of different strains to upregulate HLA-G allowing their escape from host immune responses.
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Menier C, Prevot S, Carosella ED, Rouas-Freiss N. Human leukocyte antigen-G is expressed in advanced-stage ovarian carcinoma of high-grade histology. Hum Immunol 2009; 70:1006-9. [PMID: 19660509 DOI: 10.1016/j.humimm.2009.07.021] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2009] [Revised: 07/28/2009] [Accepted: 07/29/2009] [Indexed: 10/20/2022]
Abstract
HLA-G is a nonclassical MHC class I molecule with restricted normal tissue distribution, but whose expression is induced in pathologic situations such as cancer. In regard to the its immunosuppressive properties, it has been suggested that HLA-G could be a way for tumors to escape immunosurveillance. HLA-G has been described in almost all types of cancer, whatever their origins. Ovarian cancer is the second leading cause of death among women with gynecologic cancers, after breast cancer. The high mortality rate of this pathology is linked to its late discovery resulting from discreet symptomatology at early stages and the current paucity of highly sensitive and specific biomarkers. The aim of the present study was to analyze, in a French, retrospectively based study, whether HLA-G could be a marker for the detection of ovarian cancer and the prediction of clinical evolution. For this purpose, we looked for HLA-G expression in ovarian carcinoma lesions from low to high grade and stage, and we showed that HLA-G is selectively expressed in advanced-stage disease of high-grade histology.
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Dubner D, del Rosario Pérez M, Michelin S, Bourguignon M, Moreau P, Carosella ED, Gisone P. Pharmacological inhibition of DNA repair enzymes differentially modulates telomerase activity and apoptosis in two human leukaemia cell lines. Int J Radiat Biol 2009; 80:593-605. [PMID: 15370971 DOI: 10.1080/09553000412331283506] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
PURPOSE To investigate the effect of wortmannin and 3-aminobenzamide (3-AB) on telomerase activity and apoptosis in two human leukaemia cells. MATERIALS AND METHODS MOLT-4 (p53-wild type) and KG1a (p53-null) cells were irradiated with gamma-rays (3 Gy at 1.57 Gy min(-1)) and the effects of wortmannin and 3-AB were evaluated. Telomerase activity was measured by polymerase chain reaction and the expression of human telomerase reverse transcriptase, human telomerase RNA and telomerase-associated protein 1 was assessed by reverse transcriptase-polymerase chain reaction. Apoptosis was evaluated by fluorescence microscopy and flow cytometry. RESULTS A radiation-induced up-regulation of telomerase activity was observed from 4 h post-irradiation in both cell lines. This up-regulation was abrogated by wortmannin and 3-AB. Telomerase activity was maximal 24 h post-irradiation, coinciding with an accumulation of human telomerase reverse transcriptase mRNA. Apoptosis and G2/M arrest were evident from 4 h post-irradiation in MOLT-4 cells. KG1a cells exhibited a G2/M block at 24 h post-irradiation and apoptosis increased between 24 and 48 h post-irradiation. 3-AB abolished G2/M blockage and enhanced radiation-induced apoptosis in both cell lines, while wortmannin increased apoptosis only in MOLT-4 cells. CONCLUSIONS 3-AB inhibits the radiation-associated telomerase activity increase and enhances apoptosis in MOLT-4 and KG1a cells. Wortmannin, which also inhibits the radiation-associated telomerase activity increase in both cell lines, does not modify radiation-induced apoptosis in KG1a cells. DNA repair enzymes might be selective targets for enhancing radiosensitivity in certain tumour cells.
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