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Kassas A, Moura IC, Yamashita Y, Scheffel J, Guérin-Marchand C, Blank U, Sims PJ, Wiedmer T, Monteiro RC, Rivera J, Charles N, Benhamou M. Regulation of the tyrosine phosphorylation of Phospholipid Scramblase 1 in mast cells that are stimulated through the high-affinity IgE receptor. PLoS One 2014; 9:e109800. [PMID: 25289695 PMCID: PMC4188579 DOI: 10.1371/journal.pone.0109800] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 09/14/2014] [Indexed: 01/05/2023] Open
Abstract
Engagement of high-affinity immunoglobulin E receptors (FcεRI) activates two signaling pathways in mast cells. The Lyn pathway leads to recruitment of Syk and to calcium mobilization whereas the Fyn pathway leads to phosphatidylinositol 3-kinase recruitment. Mapping the connections between both pathways remains an important task to be completed. We previously reported that Phospholipid Scramblase 1 (PLSCR1) is phosphorylated on tyrosine after cross-linking FcεRI on RBL-2H3 rat mast cells, amplifies mast cell degranulation, and is associated with both Lyn and Syk tyrosine kinases. Here, analysis of the pathway leading to PLSCR1 tyrosine phosphorylation reveals that it depends on the FcRγ chain. FcεRI aggregation in Fyn-deficient mouse bone marrow-derived mast cells (BMMC) induced a more robust increase in FcεRI-dependent tyrosine phosphorylation of PLSCR1 compared to wild-type cells, whereas PLSCR1 phosphorylation was abolished in Lyn-deficient BMMC. Lyn association with PLSCR1 was not altered in Fyn-deficient BMMC. PLSCR1 phosphorylation was also dependent on the kinase Syk and significantly, but partially, dependent on detectable calcium mobilization. Thus, the Lyn/Syk/calcium axis promotes PLSCR1 phosphorylation in multiple ways. Conversely, the Fyn-dependent pathway negatively regulates it. This study reveals a complex regulation for PLSCR1 tyrosine phosphorylation in FcεRI-activated mast cells and that PLSCR1 sits at a crossroads between Lyn and Fyn pathways.
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Affiliation(s)
- Asma Kassas
- INSERM U1149, Faculté de Médecine Xavier Bichat, Paris, France
- University Paris-Diderot, Sorbonne Paris Cité, Laboratoire d’excellence INFLAMEX, DHU FIRE, Paris, France
| | - Ivan C. Moura
- INSERM U1149, Faculté de Médecine Xavier Bichat, Paris, France
- University Paris-Diderot, Sorbonne Paris Cité, Laboratoire d’excellence INFLAMEX, DHU FIRE, Paris, France
| | - Yumi Yamashita
- Laboratory of Molecular Immunogenetics, Molecular Immunology and Inflammation Branch, NIAMSD, NIH, Bethesda, Maryland, United States of America
| | - Jorg Scheffel
- Laboratory of Molecular Immunogenetics, Molecular Immunology and Inflammation Branch, NIAMSD, NIH, Bethesda, Maryland, United States of America
| | - Claudine Guérin-Marchand
- INSERM U1149, Faculté de Médecine Xavier Bichat, Paris, France
- University Paris-Diderot, Sorbonne Paris Cité, Laboratoire d’excellence INFLAMEX, DHU FIRE, Paris, France
| | - Ulrich Blank
- INSERM U1149, Faculté de Médecine Xavier Bichat, Paris, France
- University Paris-Diderot, Sorbonne Paris Cité, Laboratoire d’excellence INFLAMEX, DHU FIRE, Paris, France
| | - Peter J. Sims
- Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, New York, United States of America
| | - Therese Wiedmer
- Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, New York, United States of America
| | - Renato C. Monteiro
- INSERM U1149, Faculté de Médecine Xavier Bichat, Paris, France
- University Paris-Diderot, Sorbonne Paris Cité, Laboratoire d’excellence INFLAMEX, DHU FIRE, Paris, France
| | - Juan Rivera
- Laboratory of Molecular Immunogenetics, Molecular Immunology and Inflammation Branch, NIAMSD, NIH, Bethesda, Maryland, United States of America
| | - Nicolas Charles
- INSERM U1149, Faculté de Médecine Xavier Bichat, Paris, France
- University Paris-Diderot, Sorbonne Paris Cité, Laboratoire d’excellence INFLAMEX, DHU FIRE, Paris, France
- * E-mail: (NC); (MB)
| | - Marc Benhamou
- INSERM U1149, Faculté de Médecine Xavier Bichat, Paris, France
- University Paris-Diderot, Sorbonne Paris Cité, Laboratoire d’excellence INFLAMEX, DHU FIRE, Paris, France
- * E-mail: (NC); (MB)
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2
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Brochetta C, Vita F, Tiwari N, Scandiuzzi L, Soranzo MR, Guérin-Marchand C, Zabucchi G, Blank U. Involvement of Munc18 isoforms in the regulation of granule exocytosis in neutrophils. Biochim Biophys Acta 2008; 1783:1781-91. [PMID: 18588921 DOI: 10.1016/j.bbamcr.2008.05.023] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2007] [Revised: 04/30/2008] [Accepted: 05/19/2008] [Indexed: 10/22/2022]
Abstract
Human neutrophil granule exocytosis mobilizes a complex set of secretory granules. This involves different combinations of soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) proteins to facilitate membrane fusion. The control mechanisms governing the late fusion steps are still poorly understood. Here, we have analyzed SNARE-interacting Sec1/Munc18 (SM) family members. We found that human neutrophils express Munc18-2 and Munc18-3 isoforms and that Munc18-2 interacts with the target-SNARE syntaxin 3. Munc18-2 was associated preferentially with primary granules but could also be found with secondary and tertiary granules, while Munc18-3 was majorily associated with secondary and tertiary granules. Ultrastructural analysis showed that both Munc18-2 and Munc18-3 were often located in close proximity to their respective SNARE-binding partners syntaxin 3 and syntaxin 4. Both isoforms were also found in plasma membrane fractions and in the cytosol, where they associate with cytoskeletal elements. Upon stimulation, Munc18-2 and Munc18-3 redistributed and became enriched on granules and in the plasma membrane. Munc18-2 primary granule exocytosis can be blocked by introduction of Munc18-2-specific antibodies indicating a crucial role in primary granule fusion. Our results suggest that Munc18-2 acts as a regulator of primary granule exocytosis, while Munc18-3 may preferentially regulate the fusion of secondary granules.
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Kanamaru Y, Pfirsch S, Aloulou M, Vrtovsnik F, Essig M, Loirat C, Deschênes G, Guérin-Marchand C, Blank U, Monteiro RC. Inhibitory ITAM signaling by Fc alpha RI-FcR gamma chain controls multiple activating responses and prevents renal inflammation. J Immunol 2008; 180:2669-78. [PMID: 18250479 DOI: 10.4049/jimmunol.180.4.2669] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Inhibitory signaling is an emerging function of ITAM-bearing immunoreceptors in the maintenance of homeostasis. Monovalent targeting of the IgA Fc receptor (FcalphaRI or CD89) by anti-FcalphaRI Fab triggers potent inhibitory ITAM (ITAM(i)) signaling through the associated FcRgamma chain (FcalphaRI-FcRgamma ITAM(i)) that prevents IgG phagocytosis and IgE-mediated asthma. It is not known whether FcalphaRI-FcRgamma ITAM(i) signaling controls receptors that do not function through an ITAM and whether this inhibition requires Src homology protein 1 phosphatase. We show in this study that FcalphaRI-Fcgamma ITAM(i) signals depend on Src homology protein 1 phosphatase to target multiple non-ITAM-bearing receptors such as chemotactic receptors, cytokine receptors, and TLRs. We found that anti-FcalphaRI Fab treatment in vivo reduced kidney inflammation in models of immune-mediated glomerulonephritis and nonimmune obstructive nephropathy by a mechanism that involved decreased inflammatory cell infiltration and fibrosis development. This treatment also prevented ex vivo LPS activation of monocytes from patients with lupus nephritis or vasculitis, as well as receptor activation through serum IgA complexes from IgA nephropathy patients. These findings point to a crucial role of FcalphaRI-FcRgamma ITAM(i) signaling in the control of multiple heterologous or autologous inflammatory responses. They also identify anti-FcalphaRI Fab as a new potential therapeutic tool for preventing progression of renal inflammatory diseases.
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Affiliation(s)
- Yutaka Kanamaru
- INSERM Unité 699, Universite Paris 7-Denis Diderot, Faculte de Medecine, Site Xavier Bichat, 16 rue Henri Huchard, Paris, France
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4
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Bodinier M, Brossard C, Triballeau S, Morisset M, Guérin-Marchand C, Pineau F, de Coppet P, Moneret-Vautrin DA, Blank U, Denery-Papini S. Evaluation of an in vitro mast cell degranulation test in the context of food allergy to wheat. Int Arch Allergy Immunol 2008; 146:307-20. [PMID: 18367844 DOI: 10.1159/000121465] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2007] [Accepted: 12/21/2007] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Antigenic profiles obtained by ELISA with IgE from patients with wheat food allergy (WFA) established that major allergens are albumins/globulins (AG) for children suffering from atopic eczema/dermatitis syndrome (AEDS), omega5-gliadins for adults suffering from wheat-dependent exercise-induced anaphylaxis (WDEIA), anaphylaxis or urticaria and low-molecular-weight (LMW) glutenin subunits for patients with anaphylaxis. We aimed to characterize a new mast cell transfectant for its ability to degranulate with wheat proteins and patient sera and compare these results to those obtained by ELISA. METHODS Thirty sera from patients with WFA were tested: 14 with AEDS (group 1) and 16 with WDEIA, anaphylaxis or urticaria (group 2). An IgE Fc receptor (FcepsilonRI) humanized rat RBL-2H3 line was established by transfection with cDNAs encoding alpha-, beta- and gamma-subunits for the human IgE receptor. RESULTS A humanized RBL clone was selected for its capacity to express mRNA alpha-, beta- and gamma-subunits of FcepsilonRI, to bind allergen-specific human IgE and to degranulate. In group 1, sera induced enhanced degranulation with AG extract, but rarely reacted with gliadins and glutenins. In group 2, half of the sera showed degranulation with LMW glutenins whereas the AG fraction and lipid transfer proteins were rarely positive. omega5-Gliadins did not appear as a major allergen in degranulation assays, although functional allergen-specific IgE was measurable in appreciable amounts. CONCLUSION Our data demonstrate that in wheat food allergen evaluation, correlation exists between mast cell degranulation and IgE measurements, depending on the type of allergen. Therefore, the biological activity of some allergen types may also be affected by other parameters.
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Affiliation(s)
- M Bodinier
- Unité de Recherche 1268, Biopolymères, Interactions, Assemblages, Institut National de la Recherche Agronomique, Université de Nantes, Nantes, France.
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5
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Kanamaru Y, Tamouza H, Pfirsch S, El-Mehdi D, Guérin-Marchand C, Pretolani M, Blank U, Monteiro RC. IgA Fc receptor I signals apoptosis through the FcRγ ITAM and affects tumor growth. Blood 2006; 109:203-11. [PMID: 16990604 DOI: 10.1182/blood-2006-06-025882] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Abstract
The IgA Fc receptor (FcαRI) has dual proinflammatory and anti-inflammatory functions that are transmitted through the immunoreceptor tyrosine-based activation motifs (ITAMs) of the associated FcRγ subunit. Whereas the involvement of FcαRI in inflammation is well documented, little is known of its anti-inflammatory mechanisms. Here we show that monomeric targeting of FcαRI by anti-FcαRI Fab or serum IgA triggers apoptosis in human monocytes, monocytic cell lines, and FcαRI+ transfectants. However, the physiologic ligand IgA induced apoptosis only when cells were cultured in low serum conditions, indicating differences with induction of anti-inflammatory signaling. Apoptosis signaling required the FcRγ ITAM, as cells transfected with FcαRI or with a chimeric FcαRI-FcRγ responded to death-activating signals, whereas cells expressing a mutated FcαRIR209L unable to associate with FcRγ, or an ITAM-mutated chimeric FcαRI-FcRγ, did not respond. FcαRI-mediated apoptosis signals were blocked by treatment with the pan-caspase inhibitor zVAD-fmk, involved proteolysis of procaspase-3, and correlated negatively with SHP-1 concentration. Anti-FcαRI Fab treatment of nude mice injected subcutaneously with FcαRI+ mast-cell transfectants prevented tumor development and halted the growth of established tumors. These findings demonstrate that, on monomeric targeting, FcαRI functions as an FcRγ ITAM-dependent apoptotic module that may be fundamental for controlling inflammation and tumor growth.
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MESH Headings
- Amino Acid Chloromethyl Ketones/pharmacology
- Amino Acid Motifs
- Animals
- Antigens, CD/chemistry
- Antigens, CD/genetics
- Antigens, CD/physiology
- Apoptosis/physiology
- Caspase 3/metabolism
- Cell Line, Tumor
- Cells, Cultured
- Culture Media, Serum-Free
- Cysteine Proteinase Inhibitors/pharmacology
- Enzyme Activation
- Female
- Humans
- Immunoglobulin A/immunology
- Immunoglobulin Fab Fragments/pharmacology
- Inflammation/immunology
- Inflammation/pathology
- Leukemia, Basophilic, Acute/pathology
- Leukemia, Basophilic, Acute/therapy
- Mast Cells/physiology
- Mast Cells/transplantation
- Mice
- Mice, Inbred C57BL
- Mice, Nude
- Mice, Transgenic
- Neoplasms/pathology
- Protein Tyrosine Phosphatase, Non-Receptor Type 6/antagonists & inhibitors
- Protein Tyrosine Phosphatase, Non-Receptor Type 6/genetics
- Protein Tyrosine Phosphatase, Non-Receptor Type 6/physiology
- RNA, Small Interfering/pharmacology
- Rats
- Receptors, Fc/chemistry
- Receptors, Fc/genetics
- Receptors, Fc/physiology
- Receptors, IgG/physiology
- Recombinant Fusion Proteins/physiology
- Skin Transplantation
- Transfection
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Affiliation(s)
- Yutaka Kanamaru
- Institut National de la Santé et de la Recherche Médicale (INSERM) U699, Paris, France
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6
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Kanamaru Y, Scandiuzzi L, Essig M, Brochetta C, Guérin-Marchand C, Tomino Y, Monteiro RC, Peuchmaur M, Blank U. Mast cell-mediated remodeling and fibrinolytic activity protect against fatal glomerulonephritis. J Immunol 2006; 176:5607-15. [PMID: 16622030 DOI: 10.4049/jimmunol.176.9.5607] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Mast cells are detrimental in several inflammatory diseases; however, their physiological roles are also increasingly recognized. Recent data suggest that mast cells may also be involved in renal diseases. We therefore used congenitally mast cell-deficient W/W(v) mice and normal +/+ littermates to assess their role in anti-glomerular basement membrane-induced glomerulonephritis. Following administration of anti-glomerular basement membrane Abs, W/W(v) mice exhibited increased mortality as compared with +/+ mice owing to rapid deterioration of renal function. Reconstitution of the mast cell population in W/W(v) mice restored protection. This was independent of activating FcgammaR, as protection was also obtained using mast cells deficient in FcRgamma. Comparative histological analysis of kidneys showed that deterioration of renal function was caused by the presence of thick layers of subendothelial glomerular deposits in W/W(v) mice, while +/+ mice or mast cell-reconstituted W/W(v) mice showed significantly less. Deposits appeared during the early phase of disease and persisted thereafter, and were accompanied by enhanced macrophage recruitment. Immunohistochemical analysis revealed increased amounts of fibrin and type I collagen in W/W(v) mice, which were also unable to maintain high tissue plasminogen activator and urinary-type plasminogen activator activity in urine in the heterologous phase of disease. Our results indicate that mast cells by their ability to mediate remodeling and repair functions are protective in immune complex-mediated glomerulonephritis.
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Affiliation(s)
- Yutaka Kanamaru
- INSERM Unité 699, Faculté de Médecine X, Bichat Medical School, 16 rue Henri Huchard, 75780 Paris Cedex 18, France
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7
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Abstract
The high affinity receptor for IgE, FcERI, is at the core of the allergic reaction. This receptor is expressed mainly on mast cells and basophils. Interaction of an allergen with its specific IgE bound to FcERI triggers cell activation, which induces the release of numerous mediators that are responsible for allergic manifestations. The recent increase in the prevalence of allergic diseases in developed countries has resulted in renewed efforts towards the development of new drugs. One of these is a humanised antibody directed against the IgE ligand. This antibody recognises specifically free but not FcERI-bound IgE thus preventing ligand binding and subsequent cell activation. This antibody has shown some efficacy in clinical trials involving patients with asthma and allergic rhinitis. The recent elucidation of the tridimensional structure of the complex between IgE and FcERI provides unexpected information regarding the mechanism of assembly of the complex, which now can be used to design small chemical compounds capable of specifically inhibiting this interaction.
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Affiliation(s)
- Ulrich Blank
- Institut Pasteur, Unité d'Immuno-Allergie, 25, rue du Docteur Roux, 75724 Paris, France.
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8
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Brahimi K, Badell E, Sauzet JP, BenMohamed L, Daubersies P, Guérin-Marchand C, Snounou G, Druilhe P. Human antibodies against Plasmodium falciparum liver-stage antigen 3 cross-react with Plasmodium yoelii preerythrocytic-stage epitopes and inhibit sporozoite invasion in vitro and in vivo. Infect Immun 2001; 69:3845-52. [PMID: 11349050 PMCID: PMC98406 DOI: 10.1128/iai.69.6.3845-3952.2001] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The Plasmodium falciparum liver-stage antigen 3 (LSA3), a recently identified preerythrocytic antigen, induces protection against malaria in chimpanzees. Using antibodies from individuals with hyperimmunity to malaria affinity purified on recombinant or synthetic polypeptides of LSA3, we identified four non-cross-reactive B-cell epitopes in Plasmodium yoelii preerythrocytic stages. On sporozoites the P. yoelii protein detected has a molecular mass similar to that of LSA3. T-cell epitopes cross-reacting with P. yoelii were also demonstrated using peripheral blood lymphocytes from LSA3-immunized chimpanzees. In contrast, no cross-reactive epitopes were found in Plasmodium berghei. LSA3-specific human antibodies exerted up to 100% inhibition of in vitro invasion of P. yoelii sporozoites into mouse hepatocytes. This strong in vitro activity was reproduced in vivo by passive transfer of LSA3 antibodies. These results indicate that the homologous epitopes may be biologically functional and suggest that P. yoelii could be used as a model to assess the antisporozoite activity of anti-LSA3 antibodies.
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Affiliation(s)
- K Brahimi
- Laboratoire de Parasitologie Biomédicale, Institut Pasteur, 75015 Paris Cedex 15, France
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9
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Grüner AC, Brahimi K, Eling W, Konings R, Meis J, Aikawa M, Daubersies P, Guérin-Marchand C, Mellouk S, Snounou G, Druilhe P. The Plasmodium falciparum knob-associated PfEMP3 antigen is also expressed at pre-erythrocytic stages and induces antibodies which inhibit sporozoite invasion. Mol Biochem Parasitol 2001; 112:253-61. [PMID: 11223132 DOI: 10.1016/s0166-6851(00)00373-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The expression of the pfemp3 gene and the corresponding PfEMP3 knob-associated protein in the pre-erythrocytic stages of Plasmodium falciparum was demonstrated by RT-PCR, Western blots, IFAT and IEM. The antigen was found on the surface of the sporozoite and in the cytoplasm of mature hepatic stage parasites. Immunological cross-reactivity was observed with sporozoites from the rodent malaria parasites Plasmodium yoelii yoelii and Plasmodium berghei and was exploited to assess a potential role of this protein at the pre-erythrocytic stages. Specific antibodies from immune individuals were found to inhibit P. yoelii yoelii and P. berghei sporozoite invasion of primary hepatocyte cultures. PfEMP3 should now be added to the small list of proteins expressed at the pre-erythrocytic stages of P. falciparum, and its vaccine potential now deserves to be investigated.
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MESH Headings
- Animals
- Antibodies, Protozoan/immunology
- Antigens, Protozoan/genetics
- Antigens, Protozoan/immunology
- Antigens, Protozoan/metabolism
- Antigens, Protozoan/ultrastructure
- Blotting, Western
- Cloning, Molecular
- Conserved Sequence
- Cross Reactions/immunology
- Epitopes/immunology
- Erythrocytes/parasitology
- Fluorescent Antibody Technique, Indirect
- Gene Expression Regulation, Developmental
- Hepatocytes/parasitology
- Humans
- Immune Sera/immunology
- Malaria/immunology
- Malaria/parasitology
- Membrane Proteins/genetics
- Membrane Proteins/immunology
- Membrane Proteins/metabolism
- Membrane Proteins/ultrastructure
- Microscopy, Immunoelectron
- Plasmodium/immunology
- Plasmodium falciparum/genetics
- Plasmodium falciparum/growth & development
- Plasmodium falciparum/immunology
- Plasmodium falciparum/metabolism
- Protozoan Proteins
- RNA, Protozoan/genetics
- RNA, Protozoan/metabolism
- Recombinant Proteins
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Affiliation(s)
- A C Grüner
- Unité de Parasitologie Biomédicale, Institut Pasteur, 25 and 28 Rue du Dr. Roux, Paris Cedex 15, 75724, France
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10
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Daubersies P, Thomas AW, Millet P, Brahimi K, Langermans JA, Ollomo B, BenMohamed L, Slierendregt B, Eling W, Van Belkum A, Dubreuil G, Meis JF, Guérin-Marchand C, Cayphas S, Cohen J, Gras-Masse H, Druilhe P, Mohamed LB. Protection against Plasmodium falciparum malaria in chimpanzees by immunization with the conserved pre-erythrocytic liver-stage antigen 3. Nat Med 2000; 6:1258-63. [PMID: 11062538 DOI: 10.1038/81366] [Citation(s) in RCA: 130] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In humans, sterile immunity against malaria can be consistently induced through exposure to the bites of thousands of irradiated infected mosquitoes. The same level of protection has yet to be achieved using subunit vaccines. Recent studies have indicated an essential function for intrahepatic parasites, the stage after the mosquito bite, and thus for antigens expressed during this stage. We report here the identification of liver-stage antigen 3, which is expressed both in the mosquito and liver-stage parasites. This Plasmodium falciparum 200-kilodalton protein is highly conserved, and showed promising antigenic and immunogenic properties. In chimpanzees (Pan troglodytes), the primates most closely related to humans and that share a similar susceptibility to P. falciparum liver-stage infection, immunization with LSA-3 induced protection against successive heterologous challenges with large numbers of P. falciparum sporozoites.
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Affiliation(s)
- P Daubersies
- Unité de Parasitologie Biomédicale, Institut Pasteur, 28 rue du Dr Roux, 75015 Paris, France.
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11
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Pelletier C, Guérin-Marchand C, Iannascoli B, Marchand F, David B, Weyer A, Blank U. Specific signaling pathways in the regulation of TNF-alpha mRNA synthesis and TNF-alpha secretion in RBL-2H3 mast cells stimulated through the high affinity IgE receptor. Inflamm Res 1998; 47:493-500. [PMID: 9892044 DOI: 10.1007/s000110050364] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
OBJECTIVE In the present study, we investigated signal transduction pathways involved in TNF-alpha gene expression and TNF-alpha secretion by mast cells stimulated through the high affinity IgE receptor (FcepsilonRI). MATERIALS AND METHODS TNF-alpha mRNA steady state levels and TNF-alpha secretion in the presence of specific pharmacological agents were monitored using rat basophilic leukemia cells (RBL-2H3) stimulated through FcepsilonRI. Relative amounts of TNF-alpha mRNA versus beta-actin levels were quantified by RNase protection and RT-PCR assays. TNF-alpha secretion was measured by a current ELISA test. RESULTS We show that EGTA (5 mM) prevented TNF-alpha mRNA expression and TNF-alpha secretion in antigen-stimulated cells. The protein kinase C (PKC) inhibitor bisindolylmaleimide I substantially blocked TNF-alpha secretion at 2 microM but had only a marginal effect on TNF-alpha mRNA expression. The results were similar when PKC isoforms were depleted by long-term exposure to 100 nM phorbol ester (PMA). The PI 3-kinase inhibitor wortmannin blocked TNF-alpha secretion at low doses (EC50= 13 nM), but only partially affected mRNA expression. CONCLUSIONS Our results show that in FcepsilonRI-stimulated RBL-2H3 cells calcium mobilization, activation of PKC and PI 3-kinase are necessary for TNF-alpha secretion while for the increased TNF-alpha mRNA expression PKC activity is dispensable and PI 3-kinase activity only partially required.
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Affiliation(s)
- C Pelletier
- Institut Pasteur, Unité d'Immuno-Allergie, Paris, France
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12
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Guérin-Marchand C, Michon T, Kolago B, Marchand F, Weyer A, Wyczolkowska J. Kinetics of protein phosphorylation and mediator secretion following antigen challenge of mast cells sensitized with monoclonal IgE or with reaginic serum. Inflamm Res 1997; 46 Suppl 1:S21-2. [PMID: 9098746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
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13
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Guérin-Marchand C, Michon T, Kolago B, Marchand F, Weyer A, Wyczolkowska J. Kinetics of protein phosphorylation and mediator secretion following antigen challenge of mast cells sensitized with monoclonal IgE or with reaginic serum. Inflamm Res 1997; 46:21-2. [PMID: 27517984 DOI: 10.1007/s000110050030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Affiliation(s)
- C Guérin-Marchand
- Unité d'Immuno-Allergie, Institut Pasteur, 28 rue du Docteur Roux, F-75724 Paris Cedex 15, France, , , , , , FR
| | - T Michon
- Dept. of Biogenic Amines, Polish Academy of Sciences, Tylna 3, PL-90-950 Lodz, Poland, , , , , , PL
| | - B Kolago
- Dept. of Biogenic Amines, Polish Academy of Sciences, Tylna 3, PL-90-950 Lodz, Poland, , , , , , PL
| | - F Marchand
- Unité d'Immuno-Allergie, Institut Pasteur, 28 rue du Docteur Roux, F-75724 Paris Cedex 15, France, , , , , , FR
| | - A Weyer
- Unité d'Immuno-Allergie, Institut Pasteur, 28 rue du Docteur Roux, F-75724 Paris Cedex 15, France, , , , , , FR
| | - J Wyczolkowska
- Dept. of Biogenic Amines, Polish Academy of Sciences, Tylna 3, PL-90-950 Lodz, Poland, , , , , , PL
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Guérin-Marchand C, Sénéchal H, Bouin AP, Leduc-Brodard V, Taudou G, Weyer A, Peltre G, David B. Cloning, sequencing and immunological characterization of Dac g 3, a major allergen from Dactylis glomerata pollen. Mol Immunol 1996; 33:797-806. [PMID: 8811075 DOI: 10.1016/0161-5890(96)00015-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Preliminary work showed that a 14-kDa allergen with a pI of 9 was recognized by more than 60% of sera from Dactylis glomerata (Dac g) pollen-allergic individuals. The N-terminal amino acid sequence of this Dac g allergen was determined by Edman degradation and compared with that of Lol p 3, a major allergen of Lolium perenne. A sequence identity of 65% was found, suggesting that the Dac g allergen could be the homologue of Lol p 3 and therefore named Dac g 3. We report the cloning and sequence analysis of a cDNA encoding the Dac g 3 pollen allergen. The recombinant allergen (rDac g 3) expressed in plasmid vector pGEX-2T contained IgE-reactive epitopes found in its natural counterpart, and induced histamine release from basophils of Dac g-allergic individuals, confirming that the recombinant protein has biological properties similar to the pollen extracted allergen. Computer analyses showed that, in spite of a high degree of sequence homology, even closely related allergens such as Dac g 3 and Lol p 3 have dissimilar predictive secondary structures and potential different antigenicity. Because it possesses the properties of the native counterpart, rDac g 3 could be a relevant tool for molecular studies in allergy.
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15
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Guérin-Marchand C, Batard T, Brodard V, Desvaux FX, Sénéchal H, David B, Peltre G. DMISA (dissociated membrane immunosorbent assay), a new ELISA technique performed with blotted samples. J Immunol Methods 1994; 167:219-25. [PMID: 8308278 DOI: 10.1016/0022-1759(94)90090-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
This study describes the use of electrophoretically purified antigens blotted onto nitrocellulose, as solid phase antigens for enzyme-linked immunosorbent assays. This procedure is called DMISA, for dissociated membrane immunosorbent assay. The method is illustrated using immunoblotted antigens of Dactylis glomerata grass pollen extract. The band of interest was located on a print of nitrocellulose by light staining (India ink), then the corresponding strip of nitrocellulose was cut out. Immediately after its solubilization in ethyleneglycol monomethyl ether, the antigen coated nitrocellulose was precipitated by the addition of buffer. In this way the bulk of the antigen remained bound to the membrane. The resulting suspension was carefully washed, and used as a solid phase antigen in an enzyme-linked immunosorbent assay. Two different electrophoretic methods were used to separate the Dactylis glomerata antigens. We compared the results obtained with classical immunoblot and with DMISA, for IgG4 and IgE quantification using sera from patients allergic to D. glomerata and purified blotted antigens present at the nanogram level.
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Paraf A, Guérin-Marchand C, Aubry J, Dubert JM. Inhibition of murine plasmocytoma tumours with antibody activity by their respective specific antigens. Ann Immunol (Paris) 1975; 126C:411-21. [PMID: 55094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Three murine plasmocytoma tumour which secrete specific antibodies have been studied for the effect of specific antigens (pneumococcal C polysaccharide and dinitrophenylated bovine gamma globulin) on the growth of these tumours in vivo. In each case, the effect of the specific antigen was to inhibit the growth of that tumour which synthesized the specific antibody. Low molecular weight haptens had no effect on tumour growth. We suggest that this antigen specific growth inhibitory effect is a function of the antigen's binding to membrane bound antibody resulting in defective membrane function.
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