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Langerak T, Broekhuizen M, Unger PPA, Tan L, Koopmans M, van Gorp E, Danser AHJ, Rockx B. Transplacental Zika virus transmission in ex vivo perfused human placentas. PLoS Negl Trop Dis 2022; 16:e0010359. [PMID: 35442976 PMCID: PMC9060339 DOI: 10.1371/journal.pntd.0010359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 05/02/2022] [Accepted: 03/25/2022] [Indexed: 11/18/2022] Open
Abstract
A Zika virus (ZIKV) infection during pregnancy can result in severe birth defects such as microcephaly. To date, it is incompletely understood how ZIKV can cross the human placenta. Furthermore, results from studies in pregnant mice and non-human primates are conflicting regarding the role of cross-reactive dengue virus (DENV) antibodies on transplacental ZIKV transmission. Elucidating how ZIKV can cross the placenta and which risk factors contribute to this is important for risk assessment and for potential intervention strategies for transplacental ZIKV transmission. In this study we use an ex vivo human placental perfusion model to study transplacental ZIKV transmission and the effect that cross-reactive DENV antibodies have on this transmission. By using this model, we demonstrate that DENV antibodies significantly increase ZIKV uptake in perfused human placentas and that this increased uptake is neonatal Fc-receptor-dependent. Furthermore, we show that cross-reactive DENV antibodies enhance ZIKV infection in term human placental explants and in primary fetal macrophages but not in primary trophoblasts. Our data supports the hypothesis that presence of cross-reactive DENV antibodies could be an important risk factor for transplacental ZIKV transmission. Furthermore, we demonstrate that the ex vivo placental perfusion model is a relevant and animal friendly model to study transplacental pathogen transmission. Zika virus is a mosquito-transmitted virus that can cause severe birth defects such as microcephaly when the infection occurs during pregnancy. Understanding how Zika virus crosses the placenta during pregnancy is important for future prevention strategies for vertical Zika virus transmission. Despite significant efforts to study this, to date it remains incompletely understood how Zika virus can cross the placenta and which risk factors contribute to this form of transmission. In this study we use an ex vivo placental perfusion model to study transplacental Zika virus transmission. The ex vivo placental perfusion model is a highly physiological and animal friendly model that mimics the in vivo conditions during pregnancy. We found that antibodies against the closely related dengue virus can significantly enhance placental uptake of Zika virus and Zika virus infection of human placental explants and fetal macrophages. These findings indicate that presence of cross-reactive dengue virus antibodies could contribute to transplacental Zika virus transmission.
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Affiliation(s)
- Thomas Langerak
- Department of Viroscience, Erasmus Medical Center, Rotterdam, the Netherlands
| | - Michelle Broekhuizen
- Department of Internal Medicine, Division of Pharmacology, Erasmus Medical Center, Rotterdam, the Netherlands
- Department of Pediatrics, Division of Neonatology, Erasmus Medical Center, Rotterdam, the Netherlands
| | | | - Lunbo Tan
- Department of Internal Medicine, Division of Pharmacology, Erasmus Medical Center, Rotterdam, the Netherlands
| | - Marion Koopmans
- Department of Viroscience, Erasmus Medical Center, Rotterdam, the Netherlands
| | - Eric van Gorp
- Department of Viroscience, Erasmus Medical Center, Rotterdam, the Netherlands
| | - A. H. Jan Danser
- Department of Internal Medicine, Division of Pharmacology, Erasmus Medical Center, Rotterdam, the Netherlands
| | - Barry Rockx
- Department of Viroscience, Erasmus Medical Center, Rotterdam, the Netherlands
- * E-mail:
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2
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Kapelski S, Klockenbring T, Fischer R, Barth S, Fendel R. Assessment of the neutrophilic antibody-dependent respiratory burst (ADRB) response to Plasmodium falciparum. J Leukoc Biol 2014; 96:1131-42. [PMID: 25118179 DOI: 10.1189/jlb.4a0614-283rr] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Semi-immunity against Pf malaria is based on a combination of cellular and humoral immune responses. PMNs and IgGs are considered important components of this process, but the underlying mechanisms are unclear. We investigated the neutrophilic ADRB by analyzing the production of ROS in response to Pf antigen-specific IgGs bound to solid-phase immobilized antigens (sADRB) or whole merozoites (mADRB). We found that the PMN stimulations in each assay were based on different underlying mechanisms, demonstrating the importance of the assay set-up for the evaluation of antibody-triggered PMN responses. In the sADRB assay, ROS were produced externally, and by specific blocking of CD32(a)/FcγRII(a), the immediate neutrophilic response was abolished, whereas the removal of CD16(b)/FcγRIII(b) had no substantial effect. The key role of CD32(a) was confirmed using CD16(b)-deficient PMNs, in which similar changes of neutrophilic ADRB profiles were recorded after treatment. In the mADRB assay, ROS were produced almost exclusively within the cell, suggesting that the underlying mechanism was phagocytosis. This was confirmed using an additional phagocytosis assay, in which PMNs specifically ingested merozoites opsonized with Ghanaian plasma IgGs, seven times more often than merozoites opsonized with European plasma IgGs (P<0.001). Our data show that assay set-ups used to evaluate the responses of PMNs and perhaps other effector cells must be chosen carefully to evaluate the appropriate cellular responses. Our robust, stable, and well-characterized methods could therefore be useful in malaria vaccine studies to analyze the antimalarial effector function of antibodies.
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Affiliation(s)
- Stephanie Kapelski
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Department of Pharmaceutical Product Development, Aachen, Germany; Rheinisch-Westfälische Technische Hochschule Aachen University, Institute for Molecular Biotechnology, Aachen, Germany; and
| | - Torsten Klockenbring
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Department of Pharmaceutical Product Development, Aachen, Germany
| | - Rainer Fischer
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Department of Pharmaceutical Product Development, Aachen, Germany; Rheinisch-Westfälische Technische Hochschule Aachen University, Institute for Molecular Biotechnology, Aachen, Germany; and
| | - Stefan Barth
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Department of Pharmaceutical Product Development, Aachen, Germany; Institute for Applied Medical Engineering at Rheinisch-Westfälische Technische Hochschule Aachen University and Hospital, Department of Experimental Medicine and Immunotherapy, Aachen, Germany
| | - Rolf Fendel
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Department of Pharmaceutical Product Development, Aachen, Germany; Rheinisch-Westfälische Technische Hochschule Aachen University, Institute for Molecular Biotechnology, Aachen, Germany; and
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3
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Haegel H, Thioudellet C, Hallet R, Geist M, Menguy T, Le Pogam F, Marchand JB, Toh ML, Duong V, Calcei A, Settelen N, Preville X, Hennequi M, Grellier B, Ancian P, Rissanen J, Clayette P, Guillen C, Rooke R, Bonnefoy JY. A unique anti-CD115 monoclonal antibody which inhibits osteolysis and skews human monocyte differentiation from M2-polarized macrophages toward dendritic cells. MAbs 2013; 5:736-47. [PMID: 23924795 PMCID: PMC3851226 DOI: 10.4161/mabs.25743] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Cancer progression has been associated with the presence of tumor-associated M2-macrophages (M2-TAMs) able to inhibit anti-tumor immune responses. It is also often associated with metastasis-induced bone destruction mediated by osteoclasts. Both cell types are controlled by the CD115 (CSF-1R)/colony-stimulating factor-1 (CSF-1, M-CSF) pathway, making CD115 a promising target for cancer therapy. Anti-human CD115 monoclonal antibodies (mAbs) that inhibit the receptor function have been generated in a number of laboratories. These mAbs compete with CSF-1 binding to CD115, dramatically affecting monocyte survival and preventing osteoclast and macrophage differentiation, but they also block CD115/CSF-1 internalization and degradation, which could lead to potent rebound CSF-1 effects in patients after mAb treatment has ended. We thus generated and selected a non-ligand competitive anti-CD115 mAb that exerts only partial inhibitory effects on CD115 signaling without blocking the internalization or the degradation of the CD115/CSF-1 complex. This mAb, H27K15, affects monocyte survival only minimally, but downregulates osteoclast differentiation and activity. Importantly, it inhibits monocyte differentiation to CD163+CD64+ M2-polarized suppressor macrophages, skewing their differentiation toward CD14-CD1a+ dendritic cells (DCs). In line with this observation, H27K15 also drastically inhibits monocyte chemotactic protein-1 secretion and reduces interleukin-6 production; these two molecules are known to be involved in M2-macrophage recruitment. Thus, the non-depleting mAb H27K15 is a promising anti-tumor candidate, able to inhibit osteoclast differentiation, likely decreasing metastasis-induced osteolysis, and able to prevent M2 polarization of TAMs while inducing DCs, hence contributing to the creation of more efficient anti-tumor immune responses.
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4
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Kramski M, Lichtfuss GF, Navis M, Isitman G, Wren L, Rawlin G, Center RJ, Jaworowski A, Kent SJ, Purcell DFJ. Anti-HIV-1 antibody-dependent cellular cytotoxicity mediated by hyperimmune bovine colostrum IgG. Eur J Immunol 2012; 42:2771-81. [PMID: 22730083 DOI: 10.1002/eji.201242469] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Revised: 05/11/2012] [Accepted: 06/15/2012] [Indexed: 11/07/2022]
Abstract
Antibodies with antibody-dependent cellular cytotoxicity (ADCC) activity play an important role in protection against HIV-1 infection, but generating sufficient amounts of antibodies to study their protective efficacy is difficult. HIV-specific IgG can be easily and inexpensively produced in large quantities using bovine colostrum. We previously vaccinated cows with HIV-1 envelope gp140 and elicited high titers of anti-gp140-binding IgG in colostrum. In the present study, we determined whether bovine antibodies would also demonstrate specific cytotoxic activity. We found that bovine IgG bind to Fcγ-receptors (FcγRs) on human neutrophils, monocytes, and NK cells in a dose-dependent manner. Antibody-dependent killing was observed in the presence of anti-HIV-1 colostrum IgG but not nonimmune colostrum IgG. Killing was dependent on Fc and FcγR interaction since ADDC activity was not seen with F(ab')(2) fragments. ADCC activity was primarily mediated by CD14(+) monocytes with FcγRIIa (CD32a) as the major receptor responsible for monocyte-mediated ADCC in response to bovine IgG. In conclusion, we demonstrate that bovine anti-HIV colostrum IgG have robust HIV-1-specific ADCC activity and therefore offer a useful source of antibodies able to provide a rapid and potent response against HIV-1 infection. This could assist the development of novel Ab-mediated approaches for prevention of HIV-1 transmission.
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Affiliation(s)
- Marit Kramski
- Department of Microbiology and Immunology, University of Melbourne, Melbourne, Australia.
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5
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Barrio MM, Abes R, Colombo M, Pizzurro G, Boix C, Roberti MP, Gélizé E, Rodriguez-Zubieta M, Mordoh J, Teillaud JL. Human macrophages and dendritic cells can equally present MART-1 antigen to CD8(+) T cells after phagocytosis of gamma-irradiated melanoma cells. PLoS One 2012; 7:e40311. [PMID: 22768350 PMCID: PMC3388056 DOI: 10.1371/journal.pone.0040311] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2011] [Accepted: 06/04/2012] [Indexed: 11/19/2022] Open
Abstract
Dendritic cells (DC) can achieve cross-presentation of naturally-occurring tumor-associated antigens after phagocytosis and processing of dying tumor cells. They have been used in different clinical settings to vaccinate cancer patients. We have previously used gamma-irradiated MART-1 expressing melanoma cells as a source of antigens to vaccinate melanoma patients by injecting irradiated cells with BCG and GM-CSF or to load immature DC and use them as a vaccine. Other clinical trials have used IFN-gamma activated macrophage killer cells (MAK) to treat cancer patients. However, the clinical use of MAK has been based on their direct tumoricidal activity rather than on their ability to act as antigen-presenting cells to stimulate an adaptive antitumor response. Thus, in the present work, we compared the fate of MART-1 after phagocytosis of gamma-irradiated cells by clinical grade DC or MAK as well as the ability of these cells to cross present MART-1 to CD8(+) T cells. Using a high affinity antibody against MART-1, 2A9, which specifically stains melanoma tumors, melanoma cell lines and normal melanocytes, the expression level of MART-1 in melanoma cell lines could be related to their ability to stimulate IFN-gamma production by a MART-1 specific HLA-A*0201-restricted CD8(+) T cell clone. Confocal microscopy with Alexa Fluor®(647)-labelled 2A9 also showed that MART-1 could be detected in tumor cells attached and/or fused to phagocytes and even inside these cells as early as 1 h and up to 24 h or 48 h after initiation of co-cultures between gamma-irradiated melanoma cells and MAK or DC, respectively. Interestingly, MART-1 was cross-presented to MART-1 specific T cells by both MAK and DC co-cultured with melanoma gamma-irradiated cells for different time-points. Thus, naturally occurring MART-1 melanoma antigen can be taken-up from dying melanoma cells into DC or MAK and both cell types can induce specific CD8(+) T cell cross-presentation thereafter.
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Affiliation(s)
- María Marcela Barrio
- Centro de Investigaciones Oncológicas,
Fundación Cáncer FUCA, Buenos Aires, Argentina
| | - Riad Abes
- INSERM UMR S 872, Paris, France
- Centre de Recherche des Cordeliers,
Université Pierre et Marie Curie – Paris6, UMR S 872, Paris,
France
- Université Paris Descartes,
UMR S 872, Paris, France
| | - Marina Colombo
- Instituto de Investigaciones Bioquímicas
de Buenos Aires, CONICET, Fundación Instituto Leloir, Buenos Aires,
Argentina
| | - Gabriela Pizzurro
- Centro de Investigaciones Oncológicas,
Fundación Cáncer FUCA, Buenos Aires, Argentina
| | - Charlotte Boix
- INSERM UMR S 872, Paris, France
- Centre de Recherche des Cordeliers,
Université Pierre et Marie Curie – Paris6, UMR S 872, Paris,
France
- Université Paris Descartes,
UMR S 872, Paris, France
| | - María Paula Roberti
- Centro de Investigaciones Oncológicas,
Fundación Cáncer FUCA, Buenos Aires, Argentina
| | - Emmanuelle Gélizé
- INSERM UMR S 872, Paris, France
- Centre de Recherche des Cordeliers,
Université Pierre et Marie Curie – Paris6, UMR S 872, Paris,
France
- Université Paris Descartes,
UMR S 872, Paris, France
| | - Mariana Rodriguez-Zubieta
- Instituto de Investigaciones Bioquímicas
de Buenos Aires, CONICET, Fundación Instituto Leloir, Buenos Aires,
Argentina
| | - José Mordoh
- Centro de Investigaciones Oncológicas,
Fundación Cáncer FUCA, Buenos Aires, Argentina
- Instituto de Investigaciones Bioquímicas
de Buenos Aires, CONICET, Fundación Instituto Leloir, Buenos Aires,
Argentina
| | - Jean-Luc Teillaud
- INSERM UMR S 872, Paris, France
- Centre de Recherche des Cordeliers,
Université Pierre et Marie Curie – Paris6, UMR S 872, Paris,
France
- Université Paris Descartes,
UMR S 872, Paris, France
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6
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Rivas-Fuentes S, García-García E, Nieto-Castañeda G, Rosales C. Fcgamma receptors exhibit different phagocytosis potential in human neutrophils. Cell Immunol 2010; 263:114-21. [PMID: 20356573 DOI: 10.1016/j.cellimm.2010.03.006] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Accepted: 03/09/2010] [Indexed: 11/17/2022]
Abstract
In neutrophils, two receptors for IgG antibodies, namely FcgammaRIIA and FcgammaRIIIB are constitutively expressed, and a third one, FcgammaRI, can be upregulated by interferon-gamma. Whether FcgammaRIIIB is capable of triggering phagocytosis by itself is still controversial. The main role of FcgammaRI has not been clearly established in these cells. To address this problem, neutrophils were treated with interferon-gamma, and then phagocytosis mediated by each type of Fcgamma receptor was evaluated by flow cytometry. FcgammaRIIA was the most efficient receptor for phagocytosis. FcgammaRIIIB could mediate phagocytosis but much less efficiently than FcgammaRIIA. Both FcgammaRIIA- and FcgammaRIIIB-mediated phagocytosis were blocked by inhibitors of Src family kinases, Syk, PI 3-K, and ERK. In contrast, interferon-gamma-induced FcgammaRI was not able to mediate phagocytosis. Also, FcgammaRI did not activate ERK in the nucleus, but was however able to stimulate an efficient calcium rise. These data show that different neutrophil Fcgamma receptors possess different phagocytosis capabilities: FcgammaRIIA and FcgammaRIIIB, but not FcgammaRI, promote phagocytosis.
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Affiliation(s)
- Selma Rivas-Fuentes
- Programa de Doctorado en Ciencias Biomédicas, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico
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7
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Schleinitz N, Chiche L, Guia S, Bouvier G, Vernier J, Morice A, Houssaint E, Harlé JR, Kaplanski G, Montero-Julian FA, Vély F. Pattern of DAP12 expression in leukocytes from both healthy and systemic lupus erythematosus patients. PLoS One 2009; 4:e6264. [PMID: 19606219 PMCID: PMC2707004 DOI: 10.1371/journal.pone.0006264] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2009] [Accepted: 06/22/2009] [Indexed: 11/28/2022] Open
Abstract
DAP12 is an ITAM-bearing transmembrane adaptor originally identified on the surface of Natural Killer cells. A broad expression among other immune cells was later found in myeloid and lymphoid cells. However, data on DAP12 expression pattern rely only on immunoblot and microarray analysis. Here, we describe the generation and the characterization of an anti-DAP12 monoclonal antibody. Using this novel reagent, we show that DAP12 expression is restricted to innate immune cells in basal condition. Since a decreased expression of DAP12 has been suggested in NK cells of systemic lupus erythematosus patients, we have further investigated the NK cell receptor repertoire and leukocyte expression of DAP12 in these patients and no major changes were detectable when compared to controls.
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Affiliation(s)
- Nicolas Schleinitz
- Department of Internal Medicine, CHU Conception, AP-HM, Marseille, France
| | - Laurent Chiche
- Department of Internal Medicine, CHU Conception, AP-HM, Marseille, France
| | - Sophie Guia
- U631-UMR6102, INSERM-CNRS-Université de la Méditerranée, CIML, Marseille, France
| | - Gaëlle Bouvier
- Beckman Coulter Immunotech, Cellular Analysis Departement, Marseille, France
| | - Julie Vernier
- Beckman Coulter Immunotech, Cellular Analysis Departement, Marseille, France
| | | | | | - Jean Robert Harlé
- Department of Internal Medicine, CHU Conception, AP-HM, Marseille, France
| | - Gilles Kaplanski
- Department of Internal Medicine, CHU Conception, AP-HM, Marseille, France
| | | | - Frédéric Vély
- UMR608, INSERM-Université de la Méditerranée, Faculté de Pharmacie, Marseille, France
- * E-mail:
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8
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Behar G, Chames P, Teulon I, Cornillon A, Alshoukr F, Roquet F, Pugnière M, Teillaud JL, Gruaz-Guyon A, Pèlegrin A, Baty D. Llama single-domain antibodies directed against nonconventional epitopes of tumor-associated carcinoembryonic antigen absent from nonspecific cross-reacting antigen. FEBS J 2009; 276:3881-93. [DOI: 10.1111/j.1742-4658.2009.07101.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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9
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García-García E, Nieto-Castañeda G, Ruiz-Saldaña M, Mora N, Rosales C. FcgammaRIIA and FcgammaRIIIB mediate nuclear factor activation through separate signaling pathways in human neutrophils. THE JOURNAL OF IMMUNOLOGY 2009; 182:4547-56. [PMID: 19342628 DOI: 10.4049/jimmunol.0801468] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Receptors for IgG Abs (Fcgamma receptors) are capable of triggering diverse cell responses in leukocytes. In neutrophils, two Fcgamma receptors, namely FcgammaRIIA and FcgammaRIIIB, are constitutively expressed. The signaling pathways that regulate FcgammaRIIA-mediated phagocytosis have been relatively well described. However, the different signaling pathways that lead to NF activation after engagement of each Fcgamma receptor have only been partially described. To address this problem, neutrophils were stimulated by cross-linking selectively each type of Fcgamma receptor with specific mAbs, and NF activation was then analyzed. FcgammaRIIIB, but not FcgammaRIIA, promoted a robust increase in phosphorylated ERK in the nucleus, and also efficient phosphorylation of the NF Elk-1. Complete mAb 3G8 (anti-FcgammaRIIIB) induced a higher response than did F(ab')(2) fragments of mAb 3G8, suggesting a possible synergistic effect of both FcgammaR receptors. However, mAb IV.3 (anti-FcgammaRIIA) alone did not cause an increase of phosphorylated ERK in the nucleus. FcgammaRIIIB-induced nuclear phosphorylation of ERK, and of Elk-1, was not affected by Syk, PI3K, or MEK inhibitors. In contrast, FcgammaRIIA- or FcgammaRIIIB-mediated phosphorylation of cytoplasmic ERK depended on Syk, PI3K, and MEK. Also, ERK, but not MEK, was constitutively present in the nucleus, and FcgammaRIIIB cross-linking did not increase the levels of nuclear ERK or MEK. These data clearly show that different neutrophil Fcgamma receptors possess different signaling capabilities. FcgammaRIIIB, but not FcgammaRIIA, activates a unique signaling pathway leading to the nuclear-restricted phosphorylation of ERK and Elk-1, independently of Syk, PI3K, or MEK.
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Affiliation(s)
- Erick García-García
- Department of Immunology, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
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10
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Marois L, Vaillancourt M, Marois S, Proulx S, Paré G, Rollet-Labelle E, Naccache PH. The ubiquitin ligase c-Cbl down-regulates FcgammaRIIa activation in human neutrophils. THE JOURNAL OF IMMUNOLOGY 2009; 182:2374-84. [PMID: 19201892 DOI: 10.4049/jimmunol.0801420] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Little is known about the mechanisms that arrest FcgammaRIIa signaling in human neutrophils once engaged by immune complexes or opsonized pathogens. In our previous studies, we observed a loss of immunoreactivity of Abs directed against FcgammaRIIa following its cross-linking. In this study, we report on the mechanisms involved in this event. A stimulated internalization of FcgammaRIIa leading to the down-regulation of its surface expression was observed by flow cytometry and confocal microscopy. Immunoprecipitation of the receptor showed that FcgammaRIIa is ubiquitinated after stimulation. MG132 and clasto-lactacystin beta-lactone inhibited the loss of immunoreactivity of FcgammaRIIa, suggesting that this receptor was down-regulated via the proteasomal pathway. The E3 ubiquitin ligase c-Cbl was found to translocate from the cytosol to the plasma membrane following receptor cross-linking. Furthermore, c-Cbl was recruited to the same subset of high-density, detergent-resistant membrane fractions as stimulated FcgammaRIIa itself. Silencing the expression of c-Cbl by small interfering RNA decreased FcgammaRIIa ubiquitination and prevented its degradation without affecting the internalisation process. It also prolonged the stimulation of the tyrosine phosphorylation response to the cross-linking of the receptor. We conclude that c-Cbl mediates the ubiquitination of stimulated FcgammaRIIa and thereby contributes to the termination of FcgammaRIIa signaling via its proteasomal degradation, thus leading to the down-regulation of neutrophil signalisation and function (phagocytosis) through this receptor.
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Affiliation(s)
- Louis Marois
- Centre de recherche en rhumatologie et immunologie, Centre de recherche du Centre hospitalier universitaire de Québec, Department of Medicine, Faculty of Medicine, Laval University, Quebec, Canada
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11
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Su K, Yang H, Li X, Li X, Gibson AW, Cafardi JM, Zhou T, Edberg JC, Kimberly RP. Expression profile of FcgammaRIIb on leukocytes and its dysregulation in systemic lupus erythematosus. THE JOURNAL OF IMMUNOLOGY 2007; 178:3272-80. [PMID: 17312177 PMCID: PMC2824439 DOI: 10.4049/jimmunol.178.5.3272] [Citation(s) in RCA: 144] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
FcgammaRIIb (CD32B, Online Mendelian Inheritance in Man 604590), an IgG FcR with a tyrosine-based inhibitory motif, plays a critical role in the balance of tolerance and autoimmunity in murine models. However, the high degree of homology between FcgammaRIIb and FcgammaRIIa in humans and the lack of specific Abs to differentiate them have hampered study of the normal expression profile of FcgammaRIIb and its potential dysregulation in autoimmune diseases such as systemic lupus erythematosus (SLE). Using our newly developed anti-FcgammaRIIb mAb 4F5 which does not react with FcgammaRIIa, we found that FcgammaRIIb is expressed on the cell surface of circulating B lymphocytes, monocytes, neutrophils, myeloid dendritic cells (DCs), and at very low levels on plasmacytoid DCs from some donors. Normal donors with the less frequent 2B.4 promoter haplotype have higher FcgammaRIIb expression on monocytes, neutrophils, and myeloid DCs similar to that reported for B lymphocytes, indicating that FcgammaRIIb expression on both myeloid and lymphoid cells is regulated by the naturally occurring regulatory single nucleotide polymorphisms in the FCGR2B promoter. FcgammaRIIb expression in normal controls is up-regulated on memory B lymphocytes compared with naive B lymphocytes. In contrast, in active SLE, FcgammaRIIb is significantly down-regulated on both memory and plasma B lymphocytes compared with naive and memory/plasma B lymphocytes from normals. Similar down-regulation of FcgammaRIIb on myeloid-lineage cells in SLE was not seen. Our studies demonstrate the constitutive regulation of FcgammaRIIb by natural gene polymorphisms and the acquired dysregulation in SLE autoimmunity, which may identify opportunities for using this receptor as a therapeutic target.
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MESH Headings
- Animals
- Antigens, CD/biosynthesis
- Antigens, CD/genetics
- Antigens, CD/immunology
- Autoimmunity/genetics
- Female
- Gene Expression Regulation/immunology
- Humans
- Leukocytes/immunology
- Leukocytes/metabolism
- Leukocytes/pathology
- Lupus Erythematosus, Systemic/genetics
- Lupus Erythematosus, Systemic/immunology
- Lupus Erythematosus, Systemic/metabolism
- Lupus Erythematosus, Systemic/pathology
- Lupus Erythematosus, Systemic/therapy
- Male
- Mice
- Polymorphism, Single Nucleotide/immunology
- Promoter Regions, Genetic
- Receptors, IgG/biosynthesis
- Receptors, IgG/genetics
- Receptors, IgG/immunology
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Affiliation(s)
| | | | | | | | | | | | | | | | - Robert P. Kimberly
- Address correspondence and reprint requests to Dr. Robert P. Kimberly, University of Alabama at Birmingham, 1530 Third Avenue South, Shelby Interdisciplinary Biomedical Research Building 172D, Birmingham, AL 35294-2182.
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Elshafie AI, Ahlin E, Mathsson L, ElGhazali G, Rönnelid J. Circulating Immune Complexes (IC) and IC-Induced Levels of GM-CSF Are Increased in Sudanese Patients with Acute VisceralLeishmania donovaniInfection Undergoing Sodium Stibogluconate Treatment: Implications for Disease Pathogenesis. THE JOURNAL OF IMMUNOLOGY 2007; 178:5383-9. [PMID: 17404324 DOI: 10.4049/jimmunol.178.8.5383] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Infection with Leishmania donovani is associated with IL-10 as well as with GM-CSF. Immune complexes (IC) exert important functions by stimulation of monocytes/macrophage-mediated production of pro- and anti-inflammatory cytokines in rheumatic diseases. In this investigation, we have explored IC-induced cytokine production during Leishmania infection. Sera from 43 patients with visceral leishmaniasis (VL), 17 patients with post-kala-azar dermal leishmaniasis, and 20 healthy Sudanese controls were precipitated with polyethylene glycol (PEG). The PEG precipitates were added to serum-free PBMC for 20 h,whereupon supernatant levels of IL-1beta, IL-6, IL-10, IL-1 receptor antagonist protein, TNF-alpha, TNF receptor p75, and GM-CSF were investigated using ELISA. Circulating levels of C1q-binding IC were also measured in the serum samples. PEG precipitates from Leishmania-infected patients induced significantly higher levels of GM-CSF (p = 0.0037) and IL-10 (p < 0.0001), as well as of IL-6 (p < 0.0001) and IL-1 receptor antagonist (p = 0.0238) as compared with PEG precipitates from controls. Patients with acute VL as well as VL patients receiving sodium stibogluconate treatment displayed significantly increased levels of PEG precipitate-induced GM-CSF. The induction of GM-CSF by circulating IC was especially prominent in acute VL patients receiving sodium stibogluconate treatment; ANOVA revealed significant interaction between disease activity and treatment for PEG precipitate-induced levels of GM-CSF (disease activity, p = 0.0006; treatment, p = 0.0005; interaction, p = 0.0046). Parallel associations were determined for C1q-binding immune complexes, but not for any cytokine other than GM-CSF. The importance of IC-induced GM-CSF in leishmaniasis warrants further study.
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13
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Hepburn AL, Mason JC, Wang S, Shepherd CJ, Florey O, Haskard DO, Davies KA. Both Fcgamma and complement receptors mediate transfer of immune complexes from erythrocytes to human macrophages under physiological flow conditions in vitro. Clin Exp Immunol 2006; 146:133-45. [PMID: 16968408 PMCID: PMC1809732 DOI: 10.1111/j.1365-2249.2006.03174.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Abnormal clearance by the mononuclear phagocytic system of immune complexes (IC) is important in the pathogenesis of systemic lupus erythematosus (SLE). We have developed an in vitro model to investigate the cellular mechanisms involved in the transfer of soluble IC from erythrocytes to human macrophages under physiological flow conditions. In this assay, erythrocytes bearing fluorescently labelled IC are perfused over monolayers of human monocytes or monocyte-derived macrophages in a parallel-plate flow chamber, and transfer quantified using confocal microscopy and flow cytometry. Using aggregated human IgG as a model IC, we have been able to demonstrate transfer of IC from erythrocytes to macrophages. Blocking studies with specific neutralizing antibodies have shown that both complement and Fcgamma receptors are required for IC transfer. Blockade of CR4 (alpha(x)beta(2) integrin), FcgammaRIIa or FcgammaRIII reduced transfer, while anti-CR3 (alpha(m)beta(2) integrin) had no effect. Blockade of CR3, FcgammaRIIa or FcgammaRIII also reduced the number of adhesive interactions between fluorescently labelled IC-bearing erythrocytes and macrophage monolayers. Taken together with the transfer data, this suggests differing roles for these receptors in the human IC transfer reaction that includes an adhesive function which facilitates IC processing by mononuclear phagocytes. Finally, a functional effect of the FcgammaRIIa R131/H131 polymorphism, important in susceptibility to SLE, has also been demonstrated using this model. Uptake of IgG(2) but not IgG(1)-containing soluble IC was reduced by macrophages from individuals homozygous for the R131 allelic variant of the receptor.
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Affiliation(s)
- A L Hepburn
- Rheumatology Section, The Eric Bywaters Centre, Imperial College London, Hammersmith Hospital, London, UK.
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14
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Zhao W, Kepley CL, Morel PA, Okumoto LM, Fukuoka Y, Schwartz LB. Fc gamma RIIa, not Fc gamma RIIb, is constitutively and functionally expressed on skin-derived human mast cells. THE JOURNAL OF IMMUNOLOGY 2006; 177:694-701. [PMID: 16785568 PMCID: PMC2176083 DOI: 10.4049/jimmunol.177.1.694] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The expression of FcgammaR by human skin-derived mast cells of the MC(TC) type was determined in the current study. Expression of mRNA was analyzed with microarray gene chips and RT-PCR; protein by Western blotting and flow cytometry; function by release of beta-hexosaminidase, PGD(2), leukotriene C(4) (LTC(4)), IL-5, IL-6, IL-13, GM-CSF, and TNF-alpha. FcgammaRIIa was consistently detected along with FcepsilonRI at the mRNA and protein levels; FcgammaRIIc was sometimes detected only by RT-PCR; but FcgammaRIIb, FcgammaRI, and FcgammaRIII mRNA and protein were not detected. FcgammaRIIa-specific mAb caused skin MC(TC) cells to degranulate and secrete PGD(2), LTC(4), GM-CSF, IL-5, IL-6, IL-13, and TNF-alpha in a dose-dependent fashion. FcepsilonRI-specific mAb caused similar amounts of each mediator to be released with the exception of LTC(4), which was not released by this agonist. Simultaneous but independent cross-linking of FcepsilonRI and FcgammaRIIa did not substantially alter mediator release above or below levels observed with each agent alone. Skin MC(TC) cells sensitized with dust-mite-specific IgE and IgG, when coaggregated by Der p2, exhibited enhanced degranulation compared with sensitization with either IgE or IgG alone. These results extend the known capabilities of human skin mast cells to respond to IgG as well as IgE-mediated signals.
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MESH Headings
- Antibodies, Monoclonal/metabolism
- Antigen-Antibody Complex/physiology
- Antigens, CD/biosynthesis
- Antigens, CD/genetics
- Antigens, CD/immunology
- Antigens, CD/physiology
- Cell Degranulation/immunology
- Cells, Cultured
- Cross-Linking Reagents/metabolism
- Gene Expression Regulation/immunology
- Humans
- Immunoglobulin E/physiology
- Immunoglobulin G/physiology
- Lung/cytology
- Lung/immunology
- Lung/metabolism
- Mast Cells/immunology
- Mast Cells/metabolism
- Nitrophenols/immunology
- Phenylacetates
- RNA, Messenger/biosynthesis
- Receptor Aggregation/immunology
- Receptors, IgG/biosynthesis
- Receptors, IgG/genetics
- Receptors, IgG/immunology
- Receptors, IgG/physiology
- Serum Albumin, Bovine/immunology
- Skin/cytology
- Skin/immunology
- Skin/metabolism
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Affiliation(s)
- Wei Zhao
- Department of Pediatrics, Virginia Commonwealth University, Richmond, VA 23298
| | - Christopher L. Kepley
- Department of Internal Medicine, Virginia Commonwealth University, Richmond, VA 23298
| | - Penelope A. Morel
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15213
| | - Lawrence M. Okumoto
- Department of Pediatrics, Virginia Commonwealth University, Richmond, VA 23298
| | - Yoshihiro Fukuoka
- Department of Internal Medicine, Virginia Commonwealth University, Richmond, VA 23298
| | - Lawrence B. Schwartz
- Department of Internal Medicine, Virginia Commonwealth University, Richmond, VA 23298
- Address correspondence and reprint request to Dr. Lawrence B. Schwartz, Virginia Commonwealth University, P.O. Box 980263, Richmond, VA 23298. E-mail address:
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15
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Mullazehi M, Mathsson L, Lampa J, Rönnelid J. Surface-bound anti-type II collagen-containing immune complexes induce production of tumor necrosis factor alpha, interleukin-1beta, and interleukin-8 from peripheral blood monocytes via Fc gamma receptor IIA: a potential pathophysiologic mechanism for humoral anti-type II collagen immunity in arthritis. ACTA ACUST UNITED AC 2006; 54:1759-71. [PMID: 16736518 DOI: 10.1002/art.21892] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE Type II collagen (CII) is a major component of hyaline cartilage, and antibodies against CII are found in a subgroup of patients with rheumatoid arthritis. We undertook this study to investigate whether and how antibodies directed against CII can form solid-phase immune complexes (ICs) with cytokine-inducing properties in a model theoretically resembling the situation in the inflamed joint, in which CII is exposed for interaction with anti-CII antibodies during periods of inflammation. METHODS Sixty-five arthritis patients with varying levels of anti-native CII antibodies and 10 healthy controls were evaluated concerning anti-CII and cytokines induced in a solid-phase IC model. Monocytes were either depleted or enriched to define responder cells. Antibodies blocking Fc gamma receptors (Fc gammaR) were used to define the responsible T cell surface receptors. RESULTS ICs containing anti-CII from arthritis patients induced the production of tumor necrosis factor alpha (TNFalpha), interleukin-1beta (IL-1beta), and IL-8. We found a close correlation between enzyme-linked immunosorbent assay optical density values and induction of TNFalpha (r = 0.862, P < 0.0001), IL-1beta (r = 0.839, P < 0.0001), and IL-8 (r = 0.547, P < 0.0001). The anti-CII-containing IC density threshold needed for cytokine induction differed among peripheral blood mononuclear cell donors. Anti-CII-containing IC-induced cytokine production was almost totally abolished (>99%) after monocyte depletion, and receptor blocking studies showed significant decreases in the production of TNFalpha, IL-1beta, and IL-8 after blocking Fc gammaRIIa, but not after blocking Fc gammaRIII. CONCLUSION These findings represent a possible mechanism for perpetuation of joint inflammation in the subgroup of arthritis patients with high levels of anti-CII. Blockade of Fc gammaRIIa and suppression of synovial macrophages are conceivable treatment options in such patients.
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16
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Mathsson L, Lampa J, Mullazehi M, Rönnelid J. Immune complexes from rheumatoid arthritis synovial fluid induce FcgammaRIIa dependent and rheumatoid factor correlated production of tumour necrosis factor-alpha by peripheral blood mononuclear cells. Arthritis Res Ther 2006; 8:R64. [PMID: 16569263 PMCID: PMC1526644 DOI: 10.1186/ar1926] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2005] [Revised: 02/10/2006] [Accepted: 02/20/2006] [Indexed: 11/10/2022] Open
Abstract
Immune complexes (ICs) can induce production of cytokines by peripheral blood mononuclear cells via Fc receptors. Rheumatoid factor (RF) develop in response to ICs in many clinical and experimental settings. We investigated whether and how polyethylene glycol (PEG) precipitated ICs from rheumatoid arthritis (RA) sera and synovial fluid (SF) can influence cytokine production by peripheral blood mononuclear cells. We also examined the relationship between RF and IC induced cytokine production. Parallel sera and SF from 47 RA patients and sera from 15 healthy control individuals were PEG precipitated. The precipitates were added to serum-free peripheral blood mononuclear cell cultures and tumour necrosis factor (TNF)-alpha levels were measured after 20 hours. In separate cell culture experiments FcgammaRIIa and FcgammaRIII were blocked and monocytes were depleted or enriched. RF in serum was determined by nephelometry, and IgG levels in precipitates and anti-cyclic citrullinated peptide antibodies in serum were measured using ELISA. Clinical data were collected from the patients' charts. In two separate investigations, we demonstrated a correlation between RF, PEG-precipitated IgG levels and induction of the proinflammatory cytokine TNF-alpha by PEG-precipitated SF ICs. No such correlation was found for serum ICs. TNF-alpha levels induced by SF precipitates, but not serum precipitates, correlated with the number of swollen and tender joints. Monocytes/macrophages were shown to be the main responder cells, and blockade of FcgammaRIIa, but not blockade of FcgammaRIII, inhibited TNF-alpha production in cultures stimulated with precipitated ICs. Anti-cyclic citrullinated peptide correlated with RF but exhibited no association with IgG content in PEG precipitates or with precipitate-induced TNF-alpha levels. These findings support the hypothesis that SF ICs and correlated RF production are directly linked to cytokine-dependent inflammation in RA. Suppression of monocytes/macrophages in RA joints or blockade of the primate-specific activating FcgammaRIIa receptor might be ways to reduce IC-induced TNF-alpha production in the joints of seropositive RA patients.
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Affiliation(s)
- Linda Mathsson
- Unit of Clinical Immunology, Uppsala University, Uppsala, Sweden
| | - Jon Lampa
- Unit of Rheumatology, Karolinska Institute, Stockholm, Sweden
| | | | - Johan Rönnelid
- Unit of Clinical Immunology, Uppsala University, Uppsala, Sweden
- Unit of Rheumatology, Karolinska Institute, Stockholm, Sweden
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17
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Fernandes MJG, Rollet-Labelle E, Paré G, Marois S, Tremblay ML, Teillaud JL, Naccache PH. CD16b associates with high-density, detergent-resistant membranes in human neutrophils. Biochem J 2006; 393:351-9. [PMID: 16171455 PMCID: PMC1383694 DOI: 10.1042/bj20050129] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
CD16b is unique in that it is the only Fc receptor linked to the plasma membrane by a GPI (glycosylphosphatidylinositol) anchor. GPI-anchored proteins often preferentially localize to DRMs (detergent-resistant membranes) that are rich in sphingolipids and cholesterol and play an important role in signal transduction. Even though the responses to CD16b engagement have been intensively investigated, the importance of DRM integrity for CD16b signalling has not been characterized in human neutrophils. We provide direct evidence that CD16b constitutively partitions with both low- and high-density DRMs. Moreover, upon CD16b engagement, a significant increase in the amount of the receptor is observed in high-density DRMs. Similarly to CD16b, CD11b also resides in low- and high-density DRMs. In contrast with CD16b, the partitioning of CD11b in DRMs does not change in response to CD16b engagement. We also provide evidence for the implication of Syk in CD16b signalling and its partitioning to DRMs in resting and activated PMNs (polymorphonuclear neutrophils). Additionally, DRM-disrupting agents, such as nystatin and methyl-beta-cyclodextrin, alter cellular responses to CD16b receptor ligation. Notably, a significant increase in the mobilization of intracellular Ca2+ and in tyrosine phosphorylation of intracellular substrates after CD16b engagement is observed. Altogether, the results of this study provide evidence that high-density DRMs play a role in CD16b signalling in human neutrophils.
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Affiliation(s)
- Maria J G Fernandes
- Department of Rheumatology and Immunology, CHUL Research Centre, Laval University, 2705 boulevarde Laurier, Sainte-Foy, Québec, Canada, G1V 4G2.
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18
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Mathsson L, Tejde A, Carlson K, Höglund M, Nilsson B, Nilsson-Ekdahl K, Rönnelid J. Cryoglobulin-induced cytokine production via FcgammaRIIa: inverse effects of complement blockade on the production of TNF-alpha and IL-10. Implications for the growth of malignant B-cell clones. Br J Haematol 2005; 129:830-8. [PMID: 15953012 DOI: 10.1111/j.1365-2141.2005.05538.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Monoclonal antibodies produced by patients with lymphoproliferative diseases sometimes appear as cryoglobulins (CG), immunoglobulins (Ig) that reversibly agglutinate and form immune complexes (IC) when cooled below normal body temperature or through variation in pH and ionic strength. In accordance with our findings of IC-induced cytokine production from peripheral blood mononuclear cells (PBMC) in systemic lupus erythematosus, we investigated whether CG can also induce cytokine production. One IgG and one IgM type I CG from two patients with multiple myeloma and Waldenstrom's macroglobulinaemia were individually purified and added to PBMC cultures. In separate experiments temperature and ionic strength were varied, or FcgammaRIIa, FcgammaRIII and complement activation were blocked; supernatant cytokine levels were then determined by enzyme-linked immunosorbent assay. CG-induced cytokine production from monocytes varied with precipitation induced by changes in temperature and ionic strength and was mediated via FcgammaRIIa- and complement-dependent mechanisms. Complement blockade resulted in increased IgG CG-induced interleukin (IL)-10 production that was inversely correlated with decreased production of tumour necrosis factor-alpha. CG-induced IL-10 might be a growth factor for malignant B-lymphocytes in CG-associated lymphoproliferative diseases with constant complement consumption. Knowledge of mechanisms underlying CG-induced cytokine production can be useful for designing treatments for type I CG-associated pathology in lymphoproliferative diseases.
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Affiliation(s)
- Linda Mathsson
- Unit of Clinical Immunology, Uppsala University, Uppsala, Sweden.
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19
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Boruchov AM, Heller G, Veri MC, Bonvini E, Ravetch JV, Young JW. Activating and inhibitory IgG Fc receptors on human DCs mediate opposing functions. J Clin Invest 2005; 115:2914-23. [PMID: 16167082 PMCID: PMC1201664 DOI: 10.1172/jci24772] [Citation(s) in RCA: 266] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2005] [Accepted: 06/28/2005] [Indexed: 11/17/2022] Open
Abstract
Human monocyte-derived DCs (moDCs) and circulating conventional DCs coexpress activating (CD32a) and inhibitory (CD32b) isoforms of IgG Fcgamma receptor (FcgammaR) II (CD32). The balance between these divergent receptors establishes a threshold of DC activation and enables immune complexes to mediate opposing effects on DC maturation and function. IFN-gamma most potently favors CD32a expression on immature DCs, whereas soluble antiinflammatory concentrations of monomeric IgG have the opposite effect. Ligation of CD32a leads to DC maturation, increased stimulation of allogeneic T cells, and enhanced secretion of inflammatory cytokines, with the exception of IL-12p70. Coligation of CD32b limits activation through CD32a and hence reduces the immunogenicity of moDCs even for a strong stimulus like alloantigen. Targeting CD32b alone does not mature or activate DCs but rather maintains an immature state. Coexpression of activating and inhibitory FcgammaRs by DCs reveals a homeostatic checkpoint for inducing tolerance or immunity by immune complexes. These findings have important implications for understanding the pathophysiology of immune complex diseases and for optimizing the efficacy of therapeutic mAbs. The data also suggest novel strategies for targeting antigens to the activating or inhibitory FcgammaRs on human DCs to generate either antigen-specific immunity or tolerance.
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Affiliation(s)
- Adam M Boruchov
- Laboratory of Cellular Immunobiology, Hematology Service, Division of Hematologic Oncology, Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.
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20
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Le Cabec V, Emorine LJ, Toesca I, Cougoule C, Maridonneau-Parini I. The human macrophage mannose receptor is not a professional phagocytic receptor. J Leukoc Biol 2005; 77:934-43. [PMID: 15767290 DOI: 10.1189/jlb.1204705] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The macrophage mannose receptor (MR) appears to play an important role in the binding and phagocytosis of several human pathogens, but its phagocytic property and signaling pathways have been poorly defined. The general strategy to explore such topics is to express the protein of interest in nonphagocytic cells, but in the case of MR, there are few reports using the full-length MR cDNA. When we searched to clone de novo the human MR (hMR) cDNA, problems were encountered, and full-length hMR cDNA was only obtained after devising a complex cloning strategy. Chinese hamster ovary cells, which have a fully functional phagocytic machinery when expressing professional phagocytic receptors, were stably transfected, and cell clones expressing hMR at quantitatively comparable levels than human macrophages or J774E cells were obtained. They exhibited a functional hMR-mediated endocytic capacity of a soluble ligand but failed to ingest classical particulate ligands of MR such as zymosan, Mycobacterium kansasii, or trimannoside bovine serum albumin-coated latex beads. Transient expression of hMR in two human cell lines did not provide a phagocytic capacity either. In conclusion, we show that MR is not a professional phagocytic receptor, as it does not possess the ability to promote particle ingestion in nonphagocytic cells on its own. We propose that MR is a binding receptor, which requires a partner to trigger phagocytosis in some specialized cells such as macrophages. Our new expression vector could represent a useful tool to study the receptor and its partnership further.
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Affiliation(s)
- Véronique Le Cabec
- Institute de Pharmacologie et de Biologie Structural, CNRS UMR 5089, Toulouse, France.
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21
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Ganesan LP, Fang H, Marsh CB, Tridandapani S. The protein-tyrosine phosphatase SHP-1 associates with the phosphorylated immunoreceptor tyrosine-based activation motif of Fc gamma RIIa to modulate signaling events in myeloid cells. J Biol Chem 2003; 278:35710-7. [PMID: 12832410 DOI: 10.1074/jbc.m305078200] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Fc gamma RIIa is a low affinity IgG receptor uniquely expressed in human cells that promotes phagocytosis of immune complexes and induces inflammatory cytokine gene transcription. Recent studies have revealed that phagocytosis initiated by Fc gamma RIIa is tightly controlled by the inositol phosphatase SHIP-1, and the protein-tyrosine phosphatase SHP-1. Whereas the molecular nature of SHIP-1 involvement with Fc gamma RIIa has been well studied, it is not clear how SHP-1 is activated by Fc gamma RIIa to mediate its regulatory effect. Here we report that Fc gamma RIIa clustering induces SHP-1 phosphatase activity in THP-1 cells. Using synthetic phosphopeptides, and stable transfectants expressing immunoreceptor tyrosine-based activation motif (ITAM) tyrosine mutants of Fc gamma RIIa, we demonstrate that SHP-1 associates with the phosphorylated amino-terminal ITAM tyrosine of Fc gamma RIIa, whereas the tyrosine kinase Syk associates with the carboxyl-terminal ITAM tyrosine. Association of SHP-1 with Fc gamma RIIa ITAM appears to suppress total cellular tyrosine phosphorylation. Furthermore, Fc gamma RIIa clustering results in the association of SHP-1 with key signaling molecules such as Syk, p85 subunit of PtdIns 3-kinase, and p62dok, suggesting that these molecules may be substrates of SHP-1 in this system. Finally, overexpression of wild-type SHP-1 but not catalytically deficient SHP-1 led to a down-regulation of NF kappa B-dependent gene transcription in THP-1 cells activated by clustering Fc gamma RIIa.
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MESH Headings
- Antigens, CD/chemistry
- Antigens, CD/genetics
- Antigens, CD/isolation & purification
- Antigens, CD/physiology
- Cell Line
- Humans
- Intracellular Signaling Peptides and Proteins
- Kinetics
- Mutagenesis, Site-Directed
- Phosphorylation
- Protein Tyrosine Phosphatase, Non-Receptor Type 6
- Protein Tyrosine Phosphatases/chemistry
- Protein Tyrosine Phosphatases/genetics
- Protein Tyrosine Phosphatases/metabolism
- Receptors, IgG/chemistry
- Receptors, IgG/genetics
- Receptors, IgG/isolation & purification
- Receptors, IgG/physiology
- Recombinant Proteins/chemistry
- Recombinant Proteins/metabolism
- Signal Transduction/physiology
- Transfection
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Affiliation(s)
- Latha P Ganesan
- Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, The Dorothy M. Davis Heart and Lung Institute, and Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio 43210, USA
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22
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Le Cabec V, Carréno S, Moisand A, Bordier C, Maridonneau-Parini I. Complement receptor 3 (CD11b/CD18) mediates type I and type II phagocytosis during nonopsonic and opsonic phagocytosis, respectively. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2002; 169:2003-9. [PMID: 12165526 DOI: 10.4049/jimmunol.169.4.2003] [Citation(s) in RCA: 152] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Two types of opsonic phagocytosis have been defined depending on the receptor engaged: FcgammaRs mediate type I phagocytosis of IgG-coated particles; complement receptor 3 (CR3) mediates type II phagocytosis of complement-coated particles. In addition to opsonic phagocytosis, CR3 also mediates nonopsonic phagocytosis of zymosan (Z) and Mycobacterium kansasii through engagement of distinct sites. Using Chinese hamster ovary cells stably expressing human CR3, we studied CR3-mediated ingestion of nonopsonized particles, Z or M. kansasii, compared with opsonized zymosan (OZ). We show that 1) while OZ sinks into cells, Z is engulfed by pseudopodia as visualized by electron microscopy; 2) in contrast to OZ, nonopsonic phagocytosis of Z and M. kansasii depends on Rac and Cdc42 but not on Rho activity; and 3) CR3-mediated phagocytosis of Z depends on the kinase activity of the Src family tyrosine kinase Hck, while OZ internalization does not. Therefore, CR3 mediates type I phagocytosis under nonopsonic conditions and type II under opsonic conditions. This is the first evidence that a single receptor can mediate both types of phagocytosis depending on the ligand used.
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Affiliation(s)
- Véronique Le Cabec
- Institut de Pharmacologie et de Biologie Structurale, Centre National de la Recherche Scientifique, Toulouse, France.
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23
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Carréno S, Caron E, Cougoule C, Emorine LJ, Maridonneau-Parini I. p59Hck isoform induces F-actin reorganization to form protrusions of the plasma membrane in a Cdc42- and Rac-dependent manner. J Biol Chem 2002; 277:21007-16. [PMID: 11904303 DOI: 10.1074/jbc.m201212200] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Hck is a protein kinase of the Src family specifically expressed in phagocytes as two isoforms, p59Hck and p61Hck, localized at the plasma membrane and lysosomes, respectively. Their individual involvement in functions ascribed to Hck, phagocytosis, cell migration, and lysosome mobilization, is still unclarified. To investigate the specific role of p59Hck, a constitutively active variant in fusion with green fluorescent protein (p59Hck(ca)) was expressed in HeLa cells. p59Hck(ca) was found at focal adhesion sites and triggered reorganization of the actin cytoskeleton, leading to plasma membrane protrusions where it co-localized with F-actin. Similarly, microinjection of p59Hck(ca) cDNA in J774.A1 macrophages induced membrane protrusions. Whereas kinase activity and membrane association of p59Hck were dispensable for location at focal adhesions, p59Hck-induced membrane protrusions were dependent on kinase activity, plasma membrane association, and Src homology 2 but not Src homology 3 domain and were inhibited by dominant-negative forms of Cdc42 or Rac but not by blocking Rho activity. A dominant negative form of p59Hck inhibited the Cdc42- and Rac-dependent FcgammaRIIa-mediated phagocytosis. Expression of the Cdc42/Rac-interacting domain of p21-activated kinase in macrophages abolished the p59Hck(ca)-induced morphological changes. Therefore, p59Hck-triggered remodeling of the actin cytoskeleton depends upon the activity of Cdc42 and Rac to promote formation of membrane protrusions necessary for phagocytosis and cell migration.
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Affiliation(s)
- Sébastien Carréno
- Institut de Pharmacologie et de Biologie Structurale, Centre National de la Recherche Scientifique UMR 5089, 205 route de Narbonne, Toulouse cedex 31077, France
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24
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Barabé F, Rollet-Labelle E, Gilbert C, Fernandes MJG, Naccache SN, Naccache PH. Early events in the activation of Fc gamma RIIA in human neutrophils: stimulated insolubilization, translocation to detergent-resistant domains, and degradation of Fc gamma RIIA. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2002; 168:4042-9. [PMID: 11937562 DOI: 10.4049/jimmunol.168.8.4042] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The signal transduction mechanisms associated with the ligation of FcgammaRIIA in human neutrophils are as yet only incompletely characterized. In the present study, we have investigated the distribution and fate of FcgammaRIIA following its cross-linking. The results obtained indicate that cross-linking of FcgammaRIIA led, within a few seconds, to its translocation into a nonionic detergent-insoluble fraction. This was followed, within a couple of minutes, by a substantial loss of immunoreactive FcgammaRIIA in the cells. The stimulated degradation of FcgammaRIIA was blocked by the Src kinase inhibitor PP1 but not by wortmannin, ST-638, piceatannol, or cytochalasin B. Cross-linked FcgammaRIIA could be solubilized by saponin (in the presence of Nonidet P-40) and by beta-octylglucoside. Sucrose gradient analysis of the distribution of FcgammaRIIA revealed that its cross-linking led to its translocation into the pellets and not the light buoyant density fractions classically associated with lipid rafts. Disruption of cholesterol-containing membrane microdomains with filipin prevented the degradation of FcgammaRIIA but did not inhibit the stimulation of the pattern of tyrosine phosphorylation or the mobilization of calcium that followed FcgammaRIIA cross-linking. These data suggest that both cholesterol-rich domains and Src kinases are required for the degradation of the activated FcgammaRIIA and provide new insights into the early events following FcgammaRIIA cross-linking.
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Affiliation(s)
- Frédéric Barabé
- Centre de Recherche en Rhumatologie et Immunologie, Canadian Institutes for Health Research Group on the Molecular Mechanisms of Inflammation, Centre de Recherche du Centre Hospitalier de l'Université Laval, Québec, Canada
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25
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Coronel A, Boyer A, Franssen JD, Romet-Lemonne JL, Fridman WH, Teillaud JL. Cytokine production and T-cell activation by macrophage-dendritic cells generated for therapeutic use. Br J Haematol 2001; 114:671-80. [PMID: 11552997 DOI: 10.1046/j.1365-2141.2001.02982.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Clinical grade ex vivo-generated antigen-presenting cells, macrophage-dendritic cells (MAC-DCs) or macrophage-activated killers (MAKs) were derived from peripheral blood mononuclear cells (PBMCs). Cultures (7 d) were performed in non-adherent conditions in the presence of granulocyte-macrophage colony-stimulating factor (GM-CSF) and either interleukin 13 (IL-13) or dihydroxy-vitamin D3 respectively. MAKs were activated during the last 24 h with interferon gamma (IFNgamma). Reverse transcription polymerase chain reaction (RT-PCR) and enzyme-linked immunosorbent assay (ELISA) analyses indicated that IL-1beta and tumour necrosis factor alpha (TNFalpha) were produced by both cells. Higher pro-inflammatory cytokine (IL-1beta and TNFalpha) amounts were detected on average in MAK supernatants. In contrast, IL-12 p40 was found only in MAC-DC supernatants, but the biologically active IL-12 form (p70) was never detected. T-cell cytokines (IL-2, IL-4, IL-10) were not produced in culture conditions in which T cells were nevertheless present. At d 7, TNFalpha or lipopolysaccharide (LPS) upregulated IL-12 p40 production by MAC-DCs, while IL-12 p70 remained undetectable. LPS stimulation also increased TNFalpha production by these cells. Allogeneic mixed lymphocyte reactions (MLR) showed that MAKs are poor stimulatory cells compared with MAC-DCs. The MAC-DC stimulatory capacity was enhanced by LPS, although the expression of HLA class II, CD83, CD80 and CD86 was unmodified. Thus, MAC-DCs represent a tool for triggering adaptative immunity, while MAK should be primarily used as effector killer cells.
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Affiliation(s)
- A Coronel
- Unité INSERM 255, Institut Curie, Paris, France
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26
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Lyden TW, Robinson JM, Tridandapani S, Teillaud JL, Garber SA, Osborne JM, Frey J, Budde P, Anderson CL. The Fc receptor for IgG expressed in the villus endothelium of human placenta is Fc gamma RIIb2. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2001; 166:3882-9. [PMID: 11238632 DOI: 10.4049/jimmunol.166.6.3882] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
To evaluate the potential role of human placental endothelial cells in the transport of IgG from maternal to fetal circulation, we studied Fc gamma receptor (Fc gamma R) expression by immunohistology and immunoblotting. Several pan-Fc gamma RII Abs that label the placental endothelium displayed a distribution pattern that correlated well with transport functions, being intense in the terminal villus and nil in the cord. In contrast, the MHC class 1-like IgG transporter, FcRn, and the classical Fc gamma RIIa were not expressed in transport-related endothelium of the placenta. Our inference, that Fc gamma RIIb was the likely receptor, we confirmed by analyzing purified placental villi, enriched in endothelium, by immunoblotting with a new Ab specific for the cytoplasmic tail of Fc gamma RIIb. These experiments showed that the Fc gamma RII expressed in villus endothelium was the b2 isoform whose cytoplasmic tail is known to include a phosphotyrosyl-based motif that inhibits a variety of immune responses. We suggest that this receptor is perfectly positioned to transport IgG although as well it may scavenge immune complexes.
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MESH Headings
- Antibodies, Monoclonal/metabolism
- Antibody Specificity
- Antigens, CD/biosynthesis
- Antigens, CD/immunology
- Antigens, CD/metabolism
- Chorionic Villi/blood supply
- Chorionic Villi/immunology
- Chorionic Villi/metabolism
- Endothelium, Vascular/cytology
- Endothelium, Vascular/immunology
- Endothelium, Vascular/metabolism
- Female
- Glycosylation
- Humans
- Microscopy, Fluorescence
- Pregnancy
- Protein Isoforms/biosynthesis
- Protein Isoforms/immunology
- Protein Isoforms/metabolism
- Receptors, IgG/biosynthesis
- Receptors, IgG/immunology
- Receptors, IgG/metabolism
- Reproducibility of Results
- Tumor Cells, Cultured
- U937 Cells
- Umbilical Cord/blood supply
- Umbilical Cord/immunology
- Umbilical Cord/metabolism
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Affiliation(s)
- T W Lyden
- Department of Internal Medicine, Ohio State University, Columbus, OH 43210, USA
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27
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Peyron P, Bordier C, N'Diaye EN, Maridonneau-Parini I. Nonopsonic phagocytosis of Mycobacterium kansasii by human neutrophils depends on cholesterol and is mediated by CR3 associated with glycosylphosphatidylinositol-anchored proteins. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2000; 165:5186-91. [PMID: 11046051 DOI: 10.4049/jimmunol.165.9.5186] [Citation(s) in RCA: 164] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Receptors involved in the phagocytosis of microorganisms under nonopsonic conditions have been little studied in neutrophils. Complement receptor type 3 (CR3) is a pattern recognition receptor able to internalize zymosan and C3bi-coated particles. We report that Abs directed against CR3 strongly inhibited nonopsonic phagocytosis of Mycobacterium kansasii in human neutrophils. In these cells CR3 has been found associated with several GPI-anchored proteins localized in cholesterol-rich microdomains (rafts) of the plasma membrane. Cholesterol sequestration by nystatin, filipin, or beta-cyclodextrin as well as treatment of neutrophils with phosphatidylinositol phospholipase C to remove GPI-anchored proteins from the cell surface markedly inhibited phagocytosis of M. kansasii, without affecting phagocytosis of zymosan or serum-opsonized M. kansasii. Abs directed against several GPI-anchored proteins inhibited phagocytosis of M. kansasii, but not of zymosan. N:-acetyl-D-glucosamine, which is known to disrupt interactions between CR3 and GPI proteins, also strongly diminished phagocytosis of these mycobacteria. In conclusion, phagocytosis of M. kansasii involved CR3, GPI-anchored receptors, and cholesterol. In contrast, phagocytosis of zymosan or opsonized particles involved CR3, but not cholesterol or GPI proteins. We propose that CR3, when associated with a GPI protein, relocates in cholesterol-rich domains where M. kansasii are internalized. When CR3 is not associated with a GPI protein, it remains outside of these domains and mediates phagocytosis of zymosan and opsonized particles, but not of M. kansasii.
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Affiliation(s)
- P Peyron
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5089, Institut de Pharmacologie et de Biologie Structurale, Toulouse, France
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28
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Pain S, Falet H, Saci A, Bachelot-Loza C, Rendu F. Tyrosine phosphorylation and association of FcgammaRII and p72(Syk) are not limited to the FcgammaRII signalling pathway. Cell Signal 2000; 12:165-71. [PMID: 10704823 DOI: 10.1016/s0898-6568(99)00079-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The tyrosine kinase p72(Syk) plays a critical role in platelet signal transduction. It associates with the platelet receptor for the Fc domain of IgGs, FcgammaRII, following stimulation by FcgammaRII cross-linking. Here, we show that p72(Syk) and FcgammaRII tyrosine phosphorylation and association occured following platelet stimulation by: (1) two monoclonal antibodies, which form a bridge between a target antigen and FcgammaRII, and (2) the G-protein-coupled receptor agonist thrombin. The kinetics of the p72(Syk)/FcgammaRII association depended on the signalling pathway (i.e., the antigen targeted or the thrombin receptor). We established a direct relationship between the level of FcgammaRII phosphorylation and the detection of its association with p72(Syk). Inhibition of p72(Syk) by piceatannol resulted in partial or total inhibition of FcgammaRII phosphorylation, after immunological activation or addition of thrombin, respectively, suggesting that p72(Syk) participates in FcgammaRII phosphorylation. The results provide evidence that p72(Syk)/FcgammaRII association is not restricted to immunological activation.
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Affiliation(s)
- S Pain
- U428 INSERM, UFR des Sciences pharmaceutiques et Biologiques, 4 avenue de l'Observatoire, 75270, Paris, France
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29
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Rouard H, Tamasdan S, Fridman WH, Teillaud JL. Vav and SLP-76 recruitment by cross-linking of FcgammaRIIa1 in promyelocytic HL-60 cells. Immunol Lett 1999; 68:347-53. [PMID: 10424442 DOI: 10.1016/s0165-2478(99)00075-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The signaling events induced upon cross-linking of the human FcgammaRIIa1 (CD32) which contains an immune receptor tyrosine-based activation motif (ITAM) in its intracellular region, were investigated in the promyelocytic HL-60 cells. It is shown here that the FcgammaRIIa1 engagement recruits the Ras pathway in these cells, as evidenced by the tyrosine-phosphorylation of the Shc adaptator protein and of the extracellular signal-regulated kinase 2 (ERK2). However, p95vav, a molecule able to interact with Rac-1 and to regulate cytoskeletal reorganization, was also found to be phosphorylated. In addition, co-immunoprecipitation experiments demonstrated that Vav is associated with SLP-76 upon FcgammaRIIa1 activation. A strong phosphorylation of p120cbl was also observed. The phosphorylation of molecules such as p95vav, SLP-76 and p120cbl suggests that FcgammaRIIa1 triggering also activates signaling pathways other than the Ras pathway.
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Affiliation(s)
- H Rouard
- Laboratoire d'Immunologie Cellulaire et Clinique, Unité INSERM 255, Institut Curie, Paris, France
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30
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Boyer A, Andreu G, Romet-Lemonne JL, Fridman WH, Teillaud JL. Generation of phagocytic MAK and MAC-DC for therapeutic use: characterization and in vitro functional properties. Exp Hematol 1999; 27:751-61. [PMID: 10210333 DOI: 10.1016/s0301-472x(98)00070-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Phagocytic cells with macrophage or dendritic cell phenotype, able to capture and ingest tumor cells, were derived in large numbers from peripheral blood mononuclear cells using two different activation procedures. Peripheral blood mononuclear cells were stimulated in nonadherent conditions in the presence of human AB serum with either granulocyte-macrophage colony-stimulating factor and dihydroxy-vitamin D3 for 7 days and with interferon-gamma for the last 18 hours to obtain activated macrophages (MAK) or with granulocyte-macrophage colony-stimulating factor and interleukin-13 for 7 days (with fresh interleukin-13 added on day 4) to obtain macrophage-dendritic cells (MAC-DC). A strong ability of MAC-DC to phagocytose yeasts was observed, in contrast to a low-intermediate phagocytosis capacity by MAK. Both CD14+ FCgammaR+ (FcgammaRI/CD64, FcgammaRII/CD32, FcgammaRIII/CD16) MAK and CD1a+/CD86+, CD14- MAC-DC were able to phagocytose whole tumor cells. However, only MAK phagocytosis was enhanced by FcgammaR engagement. MAK but not MAC-DC could lyse tumor cell in antibody-dependent cell cytotoxicity assays, via FcgammaRI. Thus, MAK as well as MAC-DC may represent valuable tools for different in vivo therapy strategies that do or do not include the use of monoclonal antibodies.
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Affiliation(s)
- A Boyer
- Laboratoire d'Immunologie Cellulaire et Clinique, Unité INSERM 255, Institut Curie, Paris, France
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31
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Michon JM, Gey A, Moutel S, Tartour E, Meresse V, Fridman W, Teillaud JL. In vivo induction of functional Fc gammaRI (CD64) on neutrophils and modulation of blood cytokine mRNA levels in cancer patients treated with G-CSF (rMetHuG-CSF). Br J Haematol 1998; 100:550-6. [PMID: 9504638 DOI: 10.1046/j.1365-2141.1998.00597.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Neutrophils from 13 children who received G-CSF for the collection of peripheral blood progenitors while they were in haematological steady state were studied at various times after G-CSF injection for Fc gammaR expression (Fc gammaRI or CD64, Fc gammaRII or CD32, and Fc gammaRIII or CD16) and for their ability to exert antibody-dependent cell cytotoxicity (ADCC) through Fc gammaRI. Changes in IFNgamma, IL8, IL10, MCP1 and TNF alpha mRNA levels in peripheral blood cells were also studied 4 h and 24 h after the first G-CSF injection. Fc gammaRI expression increased strongly after 24 h and then remained at the same level throughout treatment. In contrast, Fc gammaRIII expression sharply decreased at day 1 and diminished even further thereafter. No change in Fc gammaRII was observed. ADCC exerted by neutrophils through Fc gammaRI started to increase after 24 h with the peak level at day 5. Cytokine mRNA analyses indicated a reproducible and strong increase of IL8 mRNA (11/13 children) after 24 h, whereas the changes in the mRNA levels of the other cytokines tested were more heterogenous (TFNgamma: three; IL10: six; MCP1: five: TNF alpha: four, of the 13 children). Therefore this study opens the way to an optimized therapeutic schedule for the combined use of G-CSF and monoclonal antibodies in adjuvant immuno-intervention.
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Affiliation(s)
- J M Michon
- INSERM Unité 255, Institut Curie, Paris, France
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32
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93.4 Human FcγRII a1/a2. Hybridoma (Larchmt) 1997. [DOI: 10.1089/hyb.1997.16.574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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