Tesi sul tema "Lymphocytes"
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Culley, Donald A. "Recognition of carbohydrates by T lymphocytes in lymphocyte activation". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0022/NQ50137.pdf.
Testo completoCulley, Donald A. "Recognition of carbohyrates by T lymphocytes in lymphocyte activation". Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35686.
Testo completoBonnefoy-Berard, Nathalie. "Induction et régulation de l'activation des lymphocytes T et B par les globulines antilymphocytaires". Lyon 1, 1992. http://www.theses.fr/1992LYO1H086.
Testo completoMassinga, Loembé Marguerite. "Caractérisation phénotypique et fonctionnelle des lymphocytes B dans la lymphocytose polyclonale chronique B". Thesis, Université Laval, 2004. http://www.theses.ulaval.ca/2004/22193/22193.pdf.
Testo completoPersistent polyclonal B cell lymphocytosis (PPBL) is an unusual haematological disorder, mainly detected in adult female smokers, that shares features of both benignity (polyclonal expansion, polyconal IgM secretion, lack of clinical symptoms, stable and mostly uneventful course); and features of malignancy (atypical binucleated cells, multiple bcl-2/Ig translocations, chromosome 3 anomalies, bone marrow involvement). Still, these morphological and clonal genetic anomalies have not been restricted to a distinctive B cell subset, and the apparent heterogeneity of the involved cellular population has long impeded further characterization of the syndrome. The aim of our research was to formally identify the population involved in the lymphocytosis, to gain some insight into the mechanisms at play in its development and to evaluate the risk for subsequent transformation in patients. Over the recent years, technical inputs from the molecular field have largely contributed to a better discrimination of the various B cells subsets and, by extension, of B cell lymphoid disorders. Thus, detailed immunophenotypic studies conducted in numerous PPBL patients allowed us to definitely circumscribe the disorder to IgD+IgM+CD27+ B lymphocytes, whereas exhaustive molecular analysis of immunoglobulin genes’ variable regions has corroborated the memory status of these cells. Yet, molecular signature of the antigenic selection process, the characteristic of a T-dependent immune response, was not detected. Sequencing of the CD40 and AID genes, key regulators in the diversification and affinity maturation of the immunoglobulin receptor, was additionally carried out and expression of both molecules was assessed. No anomaly was evidenced for either gene. In light of those observations, we conclude that a differentiation block in PPBL B lymphocytes is unlikely. Rather, we propose that defects in the affinity maturation process, namely impairment of the antigenic selection mechanism, allows the survival of low affinity IgD+IgM+CD27+ memory B lymphocytes in PPBL patients. Conversely, these cells could be related to the as yet scantily characterized IgD+IgM+CD27+ memory B cell subset from the splenic MZ, also found in the blood, and presumably derived from a germinal centre independent diversification pathway. Altogether, our results contributed to the elaboration of an accurate clinical definition for PPBL, and delineated avenues for future investigations regarding both the pathological aspects of the disorder and its purely fundamental biologic ramifications.
De, Wit Dominique. "Tolérance immunologique induite: propriétés des lymphocytes T et des lymphocytes B". Doctoral thesis, Universite Libre de Bruxelles, 1991. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/213001.
Testo completoZaragoza, Bruno. "Rôle des lymphocytes T CD4+ dans l'homéostasie des lymphocytes T CD8+". Paris 6, 2009. http://www.theses.fr/2009PA066313.
Testo completoLumbroso, Serge. "Production spontanée in vitro par les lymphocytes circulants d'anticorps spécifiques de Brucella". Montpellier 1, 1990. http://www.theses.fr/1990MON11228.
Testo completoRigal, Dominique. "Action de l'histamine sur la physiologie des lymphocytes : synthèse bibliographique et apport personnel". Lyon 1, 1987. http://www.theses.fr/1987LYO1H073.
Testo completoTurner, Lynn. "RANTES and T lymphocytes". Thesis, University of Bath, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307048.
Testo completoBjörklund, Elisabet. "Multiparameter flow cytometry and minimal residual disease in patients with acute leukemia /". Stockholm, 2004. http://diss.kib.ki.se/2004/91-7349-624-3.
Testo completoBonnefoix, Thierry. "Les lymphocytes T intra-tumoraux dans les lymphomes malins non hodgkiniens B : activation, prolifération et production de facteurs de régulation des cellules B". Grenoble 1, 1991. http://www.theses.fr/1991GRE10153.
Testo completoBarré, Vincent. "La leucemie a grands lymphocytes granuleux : a propos d'un cas ; revue de la litterature". Nice, 1992. http://www.theses.fr/1992NICE6541.
Testo completoHao, Yi. "Mécanismes de sélection et de survie des lymphocytes T CD8+ et lymphocytes B". Paris 7, 2006. http://www.theses.fr/2006PA077202.
Testo completoAfter cell maturation, the repertoire selection and lymphocyte survival in the periphery are controlled by homeostatic mechanisms to keep the equilibrium. In the present work, selection and peripheral survival of CD8+ T cells and B cells were studied. The requirements for TCR signaling for T cell survival have been subjected to much debate and controversial fmdings. It is yet unclear whether ail lymphocytes are similarly dependent on TCR/MHC triggering for survival and/or LDP. We studied the peripheral survival and clone sizes of three monoclonal Tg CD8 T cell populations in conditions of progressive reduction of restricting MHC-bearing cells or ablation of different MHC molecules. We observed heterogeneous requirement of TCR/MHC signal for peripheral CD8+ T cells survival. The number of MHC class I molecules expressing cells and the ability of the TCR to recognize different MHC molecules determine CD8+ T cell survival and-the size of peripheral pool. Thus, although repertoire selection in the thymus is mainly conditioned by the affinity of TCR-MHC interactions, peripheral selection is determined by TCR cross-reactivity to environmental ligands. The effects of varying quantifies of self-antigen in- the development and selection of conventional B cells were examined by using a mouse model in which HEL-specific BCR transgenic B cells develop in the presence of the neo self-antigen HEL. We demonstrated that developing self-reactive B cells are not always highly sensitive to the deletion mechanisms imposed by membrane-bound self-antigens. Our findings demonstrated that conventional B cells can undergo positive selection and that the fate of a self-reactive B cell depends on the quantity of self-antigen, the number of BCRs engaged, and on its overall antigen-binding avidity, rather than on the affinity of individual BCRs. Previous studies in the lab have demonstrated that peripheral B cell selection follows the rule "first corne, first served" and that IgM-secreting cells are generated from a pool of stable activated B cells with an independent homeostasis. We questioned whether Ig secretion by the first population was responsible for the feedback effect observed. To test this hypothesis we used B cells from mutant mice, which are unable to secrete IgM. The production of IgM by the second population was still inhibited. Our findings indicate that IgM secretion does not mediate the feedback effect. We are currently testing alternative mechanisms. In addition, we studied the role of toll-like receptors in the development of B lymphocytes. We showed that the immature B cell compartment of young, but not adult, TLR9-defïcient mice developed earlier than that of wild type C57BL/6 mice. By a competitive repopulation strategy we showed that TLR9 signaling is necessary at key checkpoints of the murine B cell developmental program, selection into secondary lymphoid organs, and differentiation into Ig-secreting plasma cells. However, this role of TLR9 seems to be MyD88-independent
Liu, Anquan. "Proinflammatory factor mediated lymphocyte activation - the pivotal role of leukotriene B4 /". Stockholm, 2007. http://diss.kib.ki.se/2007/978-91-7357-391-7/.
Testo completoAucher, Anne. "Étude des caractéristiques de la capture de fragments de membrane par trogocytose par les lymphocytes T et B". Toulouse 3, 2008. http://thesesups.ups-tlse.fr/752/.
Testo completoEstablishment of immune responses takes place through soluble factors exchange and intracellular signals transmission. Recently, a new mode of communication has been discovered, involving the exchange of plasma membrane fragments between cells in contact. This phenomenon, called trogocytosis, originally described in T cells, occurs rapidly and efficiently and is a selective process. However, its mechanisms and physiological roles are not well defined yet. My thesis work has focused on two main areas: first to compare the mechanisms of trogocytosis in T and B lymphocytes and second to identify the criteria that determine the selectivity of transfer. Using a large panel of inhibitors of various cellular activities, we determined that trogocytosis is an active phenomenon in T cells, dependent on actin cytoskeleton and signalisation, and that it is a passive phenomenon in B cells, that can takes place in all conditions we tested. This difference, intrinsic to the cell type, is a first step towards understanding the phenomenon of trogocytosis as a whole. Concerning selectivity of molecules transfer, we first showed that glycoconjugates were captured from the target cells with the same efficiency as proteins or lipids during trogocytosis by T and B cells. In a second study, we are currently working to define the criteria of transfer selectivity of membrane components by following the transfer of unique proteins. Our initial results confirm that there is a selectivity of transfer and identify candidate proteins, whose study will enable us to understand the factors determining the transfer of molecules, and thus to advance our understanding of the mechanism(s) of trogocytosis
Denépoux, Stéphane. "Induction de mutations somatiques des gènes d'immunoglobuline dans les lymphocytes B humain in vitro". Lyon 1, 1998. http://www.theses.fr/1998LYO1T045.
Testo completoWesterberg, Lisa. "Regulation of B cell motility and adhesion in health and disease /". Stockholm, 2003. http://diss.kib.ki.se/2003/91-7349-694-4.
Testo completoThiault, Nicolas. "Les lymphocytes T régulateurs périphériques qui recirculent dans le thymus inhibent le développement de leurs précurseurs". Toulouse 3, 2014. http://thesesups.ups-tlse.fr/3100/.
Testo completoRegulatory T cells (Tregs) expressing Foxp3 play a key role in peripheral immune tolerance and thus prevent auto-immune and chronic inflammatory diseases. As most other T cell lineages, Tregs develop in the thymus. However, the Treg repertoire is enriched in auto-specific cells, contrary to the conventional T cell (Tconvs) repertoire. Therefore, the criteria ruling development of Treg and Tconv are distinct and remain to be determined. Our group has shown that Treg development is quantitatively regulated by factors other than the specificity of their precursors. To identify the mechanisms involved in this regulation, we have studied Treg development in a transgenic reporter mouse in which time spent since positive selection of a T cell can be determined. Our group has demonstrated that newly developing Tregs dwell longer in the thymus than Tconvs. Moreover, we have observed a substantial Treg population in the thymus which has spent a much more important period from positive selection. The origin of these older Tregs remains unknown: they could be either thymic resident cells or cells recirculating from the periphery. We have analyzed the TCR repertoire of these cells and shown that peripheral contraction and expansion events were reflected in the thymus. The older Tregs also displayed a phenotype of activated Tregs found in the periphery. In the thymus of mice where peripheral CD4+ T cells are specifically depleted the proportion of older Tregs was strongly reduced. Collectively these data show that most of older Tregs in the thymus are cells recirculating from the periphery. In parallel, we have found in the human thymus activated and differentiated Tregs coming from the periphery. In mice, we have observed that chemokine receptors, especially CXCR4 were implicated in peripheral Treg re-entry into the thymus. Finally, we have addressed the potential consequences of peripheral Treg recirculation. We have shown that with age the proportion of recirculating Tregs increased while that of developing Tregs diminished. In mice in which recirculation is abolished, we have observed a strong increase of Treg development. Furthermore, in an in vitro culture-system of thymic lobes, the addition of mature Tregs from the periphery inhibited Treg development. Combined, these data show that recirculating Tregs control de novo development of their precursors in the thymus. In conclusion, our results demonstrate that, upon activation, peripheral Tregs can migrate back to the thymus and regulate the de novo development of Tregs. With age, the significant increase of recirculating Treg restrains the number of Tregs generated in the thymus
Bouaziz, Jean-David. "Dualité fonctionnelle cellulaire des lymphocytes B dans les maladies inflammatoires : le concept des lymphocytes B effecteurs et régulateurs". Thesis, Paris Est, 2008. http://www.theses.fr/2008PEST0031.
Testo completoAutoimmunity results from abnormal B and T cell recognition of self antigens, which leads to autoantibody production in many cases. Autoantibodies produced by B cell-derived plasma cells provide diagnostic markers for autoimmunity, but also contribute significantly to disease pathogenesis. The therapeutic benefit of depleting B cells in mice and humans has refocused attention on B cells and their role in autoimmunity beyond autoantibody production. B cells specifically serveas cellular adjuvants for CD4+ T cell activation, while regulatory B cells, including those that produce IL-10 (B10 cells), function as negative regulators of inflammatory immune responses. The role of effector B cells is shown in the non obese diabetic mouse model (NOD) whereas the role of regulatory B cells is demonstrated in a contact dermatitis model. During experimental autoimmune encephalomyelitis, early B cell depletion makes the disease worst whereas B cell depletion after disease onset improves clinical symptoms, reflecting counter regulatory B cell functions during autoimmunity
Taylor, Sharon. "The obligatory role of the null lymphocytes in immunoglobulin synthesis by human B lymphocytes". Thesis, University of Ottawa (Canada), 1988. http://hdl.handle.net/10393/5510.
Testo completoHinkley, Heather Jane. "The in vitro radiosensitivity of fresh lymphocytes from chronic lymphocytic leukaemia using the disc assay". Thesis, University of the West of England, Bristol, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290438.
Testo completoParel, Yann. "Lymphocytes T et sclérose systémique /". Genève : [s.n.], 2009. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000256356.
Testo completoGiscombe, Stephen Ricardo Antonio. "T lymphocytes in Wegener's granulomatosis /". Stockholm, 2000. http://diss.kib.ki.se/2000/91-628-4301-x/.
Testo completoDEGLISE-FAVRE, ANNE. "Le syndrome des lymphocytes denudes". Lyon 1, 1988. http://www.theses.fr/1988LYO1M272.
Testo completoCharteris, David Graham. "T lymphocytes in intraocular inflammation". Thesis, University of Edinburgh, 1994. http://hdl.handle.net/1842/19619.
Testo completoQuay, Brigitte de. "Drug toxicity in human lymphocytes /". Bern, 1990. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Testo completoRouas-Freiss, Nathalie. "Présentation de l'antigène aux lymphocytes T : influence des phénomènes de capture de l'antigène". Paris 5, 1992. http://www.theses.fr/1992PA05P225.
Testo completoLafon, Marie-Edith. "Contribution à l'étude des lymphocytes "résidents" des sinusoides hépatiques humains". Bordeaux 2, 1989. http://www.theses.fr/1989BOR23054.
Testo completoEddahri, Fouad. "Caractéristation des lymphocytes T auxiliaires impliqués dans la régulation de la réponse humorale". Doctoral thesis, Universite Libre de Bruxelles, 2007. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210685.
Testo completoPeterson, Karin E. "The role of secondary signaling in experimental autoimmune thyroiditis". free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9904865.
Testo completoHAUSS, PASCALE. "Regulation de l'adhesion entre des lymphocytes t cd4+ et des lymphocytes b et caracterisation de l'adhesion entre des lymphocytes t cd4+ et des cellules dendritiques". Paris 7, 1994. http://www.theses.fr/1994PA077246.
Testo completoAmel, Kashipaz Mohammad Rasoul. "Investigations of cytokine production by lymphocytes and autologous mixed lymphocyte reaction in relation to systemic lupus erythematosus". Thesis, Nottingham Trent University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272764.
Testo completoMassinga, Loembé Marguerite. "La lymphocytose polyclonale chronique B, étude in vitro des propriétés biologiques des lymphocytes T et B". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0012/MQ41959.pdf.
Testo completoGros, Marilyn. "Le rôle du TGF-β1 dans la biologie des lymphocytes B". Aix-Marseille 2, 2008. http://www.theses.fr/2008AIX22062.
Testo completoNg, Bernice Yu Jing. "Chronic Inflammation-Driven Tumor Promotion Asociated with CD8+ T Cells". Yale University, 2008. http://ymtdl.med.yale.edu/theses/available/etd-08232007-122524/.
Testo completoKamphuis, Elisabeth. "Type I interferon stimulation of lymphocytes". Giessen : VVB Laufersweiler, 2007. http://geb.uni-giessen.de/geb/volltexte/2007/4791/index.html.
Testo completoKamphuis, Elisabeth. "Type I interferon stimulation of lymphocytes". Giessen VVB Laufersweiler, 2006. http://d-nb.info/988717891/34.
Testo completoMues, Marsilius. "Imaging migration and activation of lymphocytes". Diss., Ludwig-Maximilians-Universität München, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-160195.
Testo completoKadolsky, Ulrich D. "HIV Escape From Cytotoxic T-Lymphocytes". Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.523738.
Testo completoMoffett, Howell Franklin. "MicroRNAs in Normal and Malignant Lymphocytes". Thesis, Harvard University, 2011. http://dissertations.umi.com/gsas.harvard:10026.
Testo completoEllery, Jonathan. "Engineering T lymphocytes through chimaeric receptors". Thesis, University of Kent, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311224.
Testo completoGrant, Allister James. "Do T lymphocytes undergo enterohepatic recirculation?" Thesis, University of Birmingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403803.
Testo completoChen, Hang Ph D. Massachusetts Institute of Technology. "Stochastic regulation of signaling in lymphocytes". Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105020.
Testo completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 123-134).
Humans are exposed to a variety of infectious pathogens, such as virus, bacteria, etc. But we survive thanks to our immune systems. One of the important immune systems is the adaptive immune system, which mounts pathogen specific immune responses. The orchestrators are lymphocytes, including B cells and T cells. When lymphocytes are stimulated strongly enough by infected or antigen-presenting cells, the signal will be transmitted through a complex network of biochemical reactions underlying the cellular functions. Such a complex network is fundamentally regulated by stochastic principles with intriguing behaviors. This thesis aims to understand the signaling network in lymphocytes and the stochastic regulation behind. In lymphocytes, mitogen-activated protein (MAP) kinases can be triggered by various stimuli (growth factors, cytokines, etc.) with significant cellular responses (proliferation, inflammation, etc.). We first investigate the roles of upstream proteins, Son of Sevenless (SOS) and Ras guanyl-releasing protein (RasGRP), in MAP kinases, Erk and P38, activation. The signaling pathways of P38 activation are still elusive. In Chapter 3, we study two signaling pathways for P38 activation, the classical pathway through the linker for activation of T cells (LAT) complex and the alternative pathway directly via ZAP-70 molecules. In both of studies, we bring together computational tools, stochastic theories and cell biology by collaborating with biologists, Professor Jeroen Roose and Dr. Jesse Jun, in University of California, San Francisco. In biochemical systems, like lymphocytes, fluctuations are ubiquitous. Such noise may drive biochemical systems from one stable state to the other with biological significance. In this part of the work, we investigate fluctuation-driven transitions in two biochemical models: genetic toggle switches (GTS) and self/non-self peptide-major histocompatibility complex (MHC) discrimination models. In the GTS model, we introduce dynamical disorder in rate coefficients and study its influences in optimal transition paths, transition rates, and the stationary probability distribution of the system. In peptide-MHC discrimination part, we investigate the effects of a conformational change step of ZAP-70 molecules on the sensitivity and robustness of the discrimination.
by Hang Chen.
Ph. D.
VIALE, ANNE-CLAIRE. "Lymphocytes b murins : origine et devenir". Paris 6, 1992. http://www.theses.fr/1992PA066629.
Testo completoLaloux, Véronique. "Rôle immuno-régulateur des lymphocytes TNK". Paris 6, 2002. http://www.theses.fr/2002PA066206.
Testo completoFleire, S. "Recognition of membrane ligands by lymphocytes". Thesis, University College London (University of London), 2007. http://discovery.ucl.ac.uk/1445452/.
Testo completoMourade, Hélène. "Contribution à l'étude immunologique de l'infection chez le diabétique". Paris 5, 1990. http://www.theses.fr/1990PA05P157.
Testo completoLlory, Jean-François. "Etude structurale et dynamique de la membrane du lymphocyte B dans la leucémie lymphoi͏̈de chronique". Montpellier 1, 1989. http://www.theses.fr/1989MON11288.
Testo completoBich-Thuy, Lê Thi. "Mécanisme d'action de l'interleukine-2 dans l'activation, la prolifération et la différenciation des lymphocytes humains non activés par des agents exogènes". Lyon 1, 1987. http://www.theses.fr/1987LYO1H070.
Testo completoDiSanto, James Philip. "Molecular events in human T cell activation : CD4, CD8 and the human Lyt-3 molecules /". Access full-text from WCMC, 1989. http://proquest.umi.com/pqdweb?did=745024391&sid=1&Fmt=2&clientId=8424&RQT=309&VName=PQD.
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