Dissertations / Theses on the topic 'Fc fragment'
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D'ACREMONT, GEFFRIER CHRISTINE. "Recepteur de faible affinite pour le fragment fc des immunoglobulines g (recepteur fc gamma de type iii) : mise en evidence de la forme soluble circulante dans le plasma humain." Nantes, 1989. http://www.theses.fr/1989NANT030M.
Full textChichehian, Behrouz. "Formes solubles et membranaires des récepteurs du fragment Fc des IgG chez l'homme." Montpellier 1, 1987. http://www.theses.fr/1987MON13510.
Full textBenhamou, Marc. "Etude des recepteurs fc des mastocytes derives de la moelle osseuse de souris : modulation du fc::(e)r1 par la dexametasone, et caracterisation du fc::(g)r." Paris 7, 1988. http://www.theses.fr/1988PA077009.
Full textBas, Mathilde. "N-glycosylation du fragment Fc : impact sur les fonctions effectrices des anticorps et sur leur pathogénicité dans l'auto-immunité du système nerveux central." Thesis, Lille 2, 2018. http://www.theses.fr/2018LIL2S055.
Full textThe crystallizable fragment (Fc) of immunoglobulins G (IgG) orchestrates their function by binding to Fc-receptors (FcRs) and complement. N-glycosylation of asparagine-297 (N297) located in the Fc domain modifies this binding affinity endowing antibodies to selectively engage functionally distinct FcRs. Here we studied the impact of Fc N-glycosylation on antibody effector functions and on their pathogenicity in central nervous system (CNS) auto-immunity.The longevity of antibodies in the blood circulation is essentially dependent on binding to the neonatal FcR (FcRn) that salvages antibodies from degradation. Fc N-glycosylation is generally excluded to impact on antibody serum persistence. Fc-sialylation might provide an exception as our results demonstrate that Fc-sialylation of antibodies enhances their persistence in the blood circulation. This polarized glycosylation is achieved using an Fc mutation, a glutamate-residue deletion at a position close to N297 in the human IgG1 sequence. The sialylated deleted antibody is also characterized by a loss of its effector functions in vitro through a reduced binding to pro-inflammatory FcRs and complement.We studied the impact of Fc N-glycosylation on the pathogenicity of myelin-reactive auto-antibodies that can be detected in multiple sclerosis and neuromyelitis optica. We cloned a pathogenic monoclonal antibody that is specific for MOG (Myelin oligodendrocyte glycoprotein) and we obtained glycovariants of this murine IgG1 by Fc-engineering and/or production in distinct cell-lines. Assessment of their pathogenicity in murine models of EAE (Experimental auto-immune encephalomyelitis) allowed identification of notable variants. First, producing the anti-MOG antibody in a hypofucosylating cell-line augments its pathogenicity in EAE. Second, introducing specific amino-acid mutations in the Fc of the anti-MOG antibody, known to impact N-glycosylation, results in a loss of its pathogenicity and even a reduced severity of induced EAE. Such a difference in the variants pathogenicity might be explained by distinct FcR-binding profiles.This study demonstrates the major potential of Fc N-glycosylation to dictate the pathogenicity of a myelin reactive antibody response during auto-immune diseases of the CNS
Aloulou, Meryem. "La double face du signal ITAM inhibiteur (ITAMi) du système immunitaire : de la protection à l'agression." Paris 7, 2010. http://www.theses.fr/2010PA077088.
Full textImmune homeostasis is regulated by a finely tuned network of positive and negative regulatory mechanisms. These events guarantee proper surveillance and prevent hyperactivity which could lead otherwise to autoimmunity and inflammatory diseases. Immune responses involve the stimulation of immunoreceptors that contain tyrosine-based activation motifs (ITAMs). One arm of control involves immunoreceptor tyrosine-based inhibitory motif (ITIM)-bearing receptors, which, upon co-aggregation, initiate an inhibitory signal through recruitment of signal-aborting phosphatases. In this study, we have challenged the classical concept of ITAM-ITIM by highlighting the inhibitory properties of the ITAM bearing receptors FcvRIII and FcaRI. We have termed this new configuration of the ITAM, ITAMi for inhibitory ITAM (Article 3). We have shown that the type of ligand and its valency were key elaments of thé cellular response induced by both receptors. ITAMi signaling induced by RFcvlll has deleterious role during seps/s (Article 2). In contrast, ITAMi signaling may also have beneficial effects in some inflammatory or autoimmune diseases (Articles 1 and 4). ITAMi signaling induced by FcyRIII and FcaRI can inhibit signal induced by a whole variety of other receptors (such as FceRI, TLR4, MRCO, TNFaR) in thé absence of co-aggregation. Nevertheless, our results show that both receptors (effector and target) are found in the same polarized intracellular clusters named "inhibosome" whose formation is required for providing ITAMi signaling (Article 5)
Lin, Hsin Hsin. "Mechanisms of Intravenous Immunoglobulin in the Treatment of Experimental Autoimmune Neuritis." University of Sydney, 2007. http://hdl.handle.net/2123/1696.
Full textThe aims of this study were to test the efficacy of immunoglobulin and its Fab and Fc fragment in the treatment of experimental autoimmune neuritis (EAN) in Lewis rats, to investigate which portion of immunoglobulin is operative in the effect of IVIg, and to clarify the possible mechanisms by which immunoglobulin exerts its action in the treatment of rats EAN. EAN was induced by immunization with whole bovine peripheral nerve myelin. The immunized rats were randomized into groups, assessed clinically, electrophysiologically, and histologically, and intravenously injected with normal saline, albumin, human IVIg preparation, purified Fab or Fc fragments. The treatment efficacy was compared between normal saline and albumin groups, albumin and IVIg groups, albumin and Fab groups, albumin and Fc groups, Fab and Fc groups, Fab and IVIg groups, and Fc and IVIg groups. Methods of myelin isolation, antibody purification, and Western blot techniques were also applied. The results revealed that treatment with Fc fragment and IVIg at the onset of signs of disease effectively prevented further progression of disease, shortened disease duration, and facilitating recovery from illness as shown in clinical, electrophysiological and histological parameters. In the study which the efficacy of albumin and IVIg was compared, 5 out of 17 rats (29%) in the albumin group and 12 out of 17 (71%) in the IVIg group completely recovered from the clinical disease by day 30. The animals receiving IVIg treatment exhibited lower clinical scores, less prolongation of S wave latencies, better maintained S wave amplitudes, less reduction of distal motor NCVs, better maintained distal and proximal CMAP amplitudes, and lower histological grades. In the study which the efficacy of albumin, Fab fragment, Fc fragment, and IVIg was compared, 0 out of 8 (0%) in the albumin group, 1 out of 8 (13%) in the Fab group, 4 out of 8 (50%) in the Fc group, and 6 out of 9 (67%) rats in the IgG group completely recovered from the clinical disease by day 30. The animals receiving Fc fragment and IVIg treatment exhibited lower clinical scores, less prominent weight loss, less prolongation of S wave latencies, better maintained S wave amplitudes, less reduction of distal motor NCVs, better maintained distal and proximal CMAP amplitudes, and lower histological grades.
Lin, Hsin Hsin. "Mechanisms of Intravenous Immunoglobulin in the Treatment of Experimental Autoimmune Neuritis." Thesis, The University of Sydney, 2006. http://hdl.handle.net/2123/1696.
Full textDurand, Véronique. "Etude du rôle des récepteurs de type III pour le Fc des IgG : effets regulateurs des auto-anticorps correspondants dans l'auto-immunité (doctorat : immunologie)." Brest, 2000. http://www.theses.fr/2000BRES3100.
Full textKrämer, Thomas [Verfasser]. "Prävention der ischämischen Querschnittlähmung durch ein carbamyliertes Fusionsprotein aus Erythropoetin und einem humanen Fc-Fragment bei Aortenokklusion am Schweinemodell / Thomas Krämer." Ulm : Universität Ulm. Medizinische Fakultät, 2013. http://d-nb.info/1030045658/34.
Full textSchlaeth, Martin [Verfasser]. "Untersuchung der Antikörper-abhängigen zellulären Zytotoxizität von humanisierten EGF-Rezeptor-Antikörpern mit optimiertem Antikörper-Fc-Fragment gegen Tumorzellen mit mutiertem KRAS-Protein / Martin Schlaeth." Kiel : Universitätsbibliothek Kiel, 2013. http://d-nb.info/1031190244/34.
Full textBénichou, Gilles. "Signalisation cellulaire par pontage bipolaire (mono- ou bicellulaire) au moyen d'anticorps specifiques : influence de l'isotype sur la nature du signal." Paris 6, 1987. http://www.theses.fr/1987PA066261.
Full textDutertre, Charles-Antoine. "De l'importance de la caractérisation des différentes isoformes de RFC gamma des cellules NK pour l'optimisation fonctionnelle des anticorps monoclonaux à usage thérapeutique." Paris 7, 2008. http://www.theses.fr/2008PA077132.
Full textImportant efforts have been devoted to the optimization of cytotoxic therapeutic monoclonal antibodies (mAb), in particular to the improvement of their capacity to engage the activating RFcγIIIA (CD16) expressed on NK cells that are capable of antibody-dependent cellular cytotoxicity (ADCC). In the present work, we examined the expression of FcγRIl by human NK cells, as well as their role in the control of ADCC, which made it possible to define a novel NK cell subpopulation, CD56dim/CD3ˉ/NKp46⁺/RFcγlllAbright/RFcγllbright that strongly expresses inhibitory FcyRIlB. We showed that FcYRMBbright NK cells, detected in all the donors tested, exhibit an expression profile of NK cell receptors (NKR) different from that of NK RFcγll'°/ˉ cells (that predominantly express the activating FcγRIIC), as well as a reduced degranulation following FcγR-dependent activation. The second part of our work allowed the demonstration that an anti-CD20 EMAB-6 antibody developed by the Laboratoire français du Fractionnement et des Biotechnologies, presents a much higher cytotoxic activity against B cell chronic lymphocytic leukemia (B-CLL) cells in vitro than rituximab, a marketed anti-CD20 therapeutic mAb. This increased activity was linked to a much higher binding capacity to FcyRIIIA as compared to its non-optimized counterpart or to rituximab. Our studies also confirmed that the low fucose level of the EMAB-6 mAb is essential to its increased FcγRIIIA binding and efficacy. Finally, the better cytotoxic activity of this antibody as compared to rituximab was found even increased when the density of CD20 on target cells was lower
Good, Samantha. "An investigation into the interaction of truncated recombinant IgE-Fc fragments with Fc&RI and CD23." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274954.
Full textPasquier, Benoit. "Dualité fonctionnelle du récepteur aux fragments constants des Immunoglobulines A : RFcαI ou CD89." Paris 5, 2004. http://www.theses.fr/2004PA05N032.
Full textSerum IgA is considered a housekeeper of the immune system with anti-inflammatory functions whereas IgA-immune complexes mediate inflammation. Here, we identify FcαRI or CD89 as the molecular device that determines the nature of IgA responses In the absence of sustained aggregation, receptor targeting by IgA or anti-FcαRI Fab inhibits activatory responses of heterologous receptors. The inhibitory mechanism involves recruitment of the tyrosine phosphatase SHP-1 to FcαRI, thereby affecting Syk, LAT and ERK phosphorylation. Conversely, sustained aggregation of FcαRI by multimeric ligands stimulates cell activation. Both signals require the FcαRγ-ITAM motif. Anti-FcαRI fab treatment suppresses manifestations of allergic asthma in FcαRI transgenic mice
Benadda, Samira. "Le rôle du système endosomal dans la fonction des récepteurs activateurs aux fragments Fc des immnunoglobulines : exemples du RFcyI." Thesis, Université de Paris (2019-....), 2019. http://www.theses.fr/2019UNIP7075.
Full textImmunoglobulin Fc receptors (FcR) are cell surface immune receptors at the interface between innate and adaptive immunity. They recognize the Fc part of the immunoglobulin of the immune complexes consisting of an antigen and a specific immunoglobulin. They trigger signaling pathways that determine the production of anti- or pro-inflammatory mediators and other reactions allowing the elimination of infection. After the binding of ICs, the receptor and the ICs are internalized. It is known that this internalization allows the presentation of the antigen contained in the ICs and the elimination of internalized pathogens, but the role of internalization in signal transduction via RFCs has not been well studied before.We investigated the role of the endosomal system in FcR function and we showed that the FcγR1, a high affinity IgG receptor, continues to signal via endosomal signaling platfrorms, which would be essential for the complete activation of the receptor functions. The endosomes characterized by insulin-dependent aminopeptidase IRAP constituted a signaling platform for RFcγI. Similarly, we have demonstrated that the CD3ζ subunit of the TCR, the lymphocyte T receptor, form an intracellular pool in the endosomes containing IRAP and the syntaxine STX6. Our results demonstrate that the TCR continues to signal after endocytosis and that this intracellular signaling is particularly important for T cell activation by low affinity peptide-MHC complexes
Gay, Chantal. "Activités des IgG placentaires et de leurs fragments FC et FAB dans la différenciation des lymphocytes B humains." Lyon 1, 1988. http://www.theses.fr/1988LYO1T089.
Full textGay, Chantal. "Activités des IGG placentaires et de leurs fragments FC et FAB dans la différenciation des lymphocytes B humains." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37613867s.
Full textCain, Stuart A. "Over-expression of recombinant Fc#epsilon#RI #alpha#-chain and IgE fragments in Pichia pastoris for structural and functional studies." Thesis, University of Sheffield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267200.
Full textDecraene, Maud. "Mise en place de la réponse immunitaire orchestrée par les cellules dendritiques humaines : caractérisation et étude fonctionnelle du rôle des RFcγ." Paris 6, 2005. http://www.theses.fr/2005PA066130.
Full textTernant, David. "Etude des relations dose-concentration-effet des anticorps thérapeutiques par modélisation pharmacocinétique et pharmacocinétique-pharmacodynamique." Tours, 2007. http://www.theses.fr/2007TOUR3314.
Full textTherapeutic antibodies (TAbs) have largely improved therapeutic management. However, the variability of their dose-concentration-effect relationship remains poorly known. The objective were to describe this variability for bevacizumab, infliximab, rituximab and antilymphocyte globulins (ALG). The pharmacokinetics of antibodies was described using a 2 compartment model. The pharmacokinetic variability seems to be influenced by body weight and immune response against Tabs, and antigenic burden. The concentration-effect relationship (CER) of bevacizumab and ALG was described by a indirect response model. We found an influence of FCGR3A polymorphism on CER of ALG, which suggests that ALG act, at least in part, by antibody-dependent cellular cytotoxicity. Account for identified variability factors should enable the optimisation of dosing regimen and efficacy of Tabs
Chao, Wei-Lung, and 趙偉龍. "Construction of a Eukaryotic Recombinant DNA Expressing the Fusion Protein of Human Toll-like Receptor 2 and Fc Fragment of Immunoglobulin G." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/18696940370155362171.
Full text東海大學
食品科學系
96
Toll-like receptor 2 (TLR2), one of TLRs that recognizes a broad range of microbial components, is a membrane receptor which is closely related to innate immunity. Fc fragment of IgG can induce the polarization towards Th1 that may help to relieve hypersensitivity. Previous studies have demonstrated that the signal transduction via membrane TLR2, was decreased by soluble TLR2 (sTLR2) in breast milk and plasma, thereby minimized the risk of allergy. In this study, we intended to express the functional sTLR2-Fc fusion protein to evaluate its potential protective role toward asthma. Full coding sequences of TLR2 was cloned to a T&A cloning vector. After trimming out the TLR2 stop codon and toll/interlukin-1 receptor, TLR2 was combined with Fc fragment which contains hinge, CH2, and CH3. The hybrid construct and wild-type TLR2 control were then subcloned to pIRES2-EGFP for eukaryotic expression in human embryo kidney cell line HEK-293, after DNA sequence verification. The estimated molecular weight of expression proteins are 87, 90, and 112 kDa. The result show that sTLR2 and Fc in breast milk consisted more than one form. Human breast milk obtained in one week and one month after childbirth contained four forms in sTLR2 ranging from 55~95 kDa, and two forms in Fc of IgG ranging from 28~72 kDa. The expressed protein wild-type TLR2 and recombined sTLR2-Fc proteins will be manifested by Western blot analysis.
Ear, Po Hien. "Development of a binary positive and negative protein fragment complementation assay using yeast cytosine deaminase." Thèse, 2005. http://hdl.handle.net/1866/15205.
Full textStanitzek, Susanne [Verfasser]. "Strukturelle Charakterisierung der PPC-Synthetase aus der Biosynthese von Coenzym A : Röntgenstrukturanalyse des Co-Chaperons Cns1-218-C und des Fc-Fragments des Antikörpers MAK33 aus Maus / Susanne Stanitzek." 2005. http://d-nb.info/977596508/34.
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