Academic literature on the topic 'Lymphocyte T CD4+ "helper"'
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Journal articles on the topic "Lymphocyte T CD4+ "helper""
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Hammami, Muhammad M., Abderrezak Bouchama, Essam Shail, Hassan Y. Aboul-Enein, and Sultan Al-Sedairy. "Lymphocyte subsets and adhesion molecules expression in heatstroke and heat stress." Journal of Applied Physiology 84, no. 5 (May 1, 1998): 1615–21. http://dx.doi.org/10.1152/jappl.1998.84.5.1615.
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We examined the specificity of the recently reported alterations in circulating lymphocytes in heatstroke by determining lymphocyte subsets in 14 consecutive heatstroke patients before and after cooling and in 7 heat-stressed controls using single- or two-color immunofluorescence flow cytometry. The relationship with catecholamine levels was also studied. In heatstroke, percentages of T (CD3+/CD19−), T-helper (CD4+/CD8−), T-inactive [CD3+/human leukocyte antigen-DR−], CD11a+, CD11c+, and CD44+lymphocytes were significantly decreased, whereas percentages of T-suppressor-cytotoxic (CD8+/CD4−), natural killer (NK; CD3−/CD16+or CD56+), CD3+/CD16+or CD56+, and CD54+lymphocytes were significantly increased, compared with 11 normal controls. The changes in the absolute numbers of lymphocyte subsets were in the same direction and were significant for T-helper, T-suppressor-cytotoxic, NK, CD3+/CD16+or CD56+, and CD11c+lymphocytes. Milder but significant changes in percentages of T-helper, T-suppressor-cytotoxic, CD11c+, and CD44+lymphocytes were seen in heat stress. Cooling was associated with partial or complete normalization, further derangement (CD11a+, CD11c+), or overcorrection (NK, T-suppressor-cytotoxic, CD11b+) of abnormal percentages of lymphocyte subsets. Norepinephrine levels were significantly elevated in heatstroke (4.7-fold) and heat stress (3.2-fold), but did not significantly correlate with lymphocyte subsets. We conclude that heatstroke is associated with significant changes in percentages and in absolute numbers of a wide range of circulating lymphocyte subsets that are not related to elevated catecholamine levels or totally normalized by cooling. Similar, albeit milder, changes are seen in heat stress, suggesting that the two syndromes represent a continuum.
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Plachynta, M. "CD4+ T-helpers in TCR-dependent tumor immunosurveillance and T-cell based adoptive transfer immunotherapy: are they really that helpful?" Cell and Organ Transplantology 3, no. 1 (May 31, 2015): 87–91. http://dx.doi.org/10.22494/cot.v3i1.20.
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In this brief review the advances and hurdles of the modern-day ACT (adoptive cell transfer) immunotherapy of cancer are discussed, with the focus on the positive or negative role of CD4+ T helper lymphocytes as one of major constituents of oncologic patient-administered CIK (cytokine-induced killers) lymphocyte culture. The beneficial role of CD4+ T helpers in adoptively-transferred lymphocyte culture is considered, questioned and being put under doubt. “Infectious tolerance” and tumor “immune avoidance” phenomena are described, emphasizing on their dramatic implications for cancer ACT therapy. The ways to circumvent apparent undesired effects of CD4+ T helpers elevated presence in CIK bulk mass are discussed, such as complete removal of CD4 -positive cells, along with a less radical measure, which is depletion of CD4+CD25+FoxP3+ T regulatory lymphocytes from bulk CIK culture.
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Moon, Joon Ho, Jin Ho Baek, Dong Hwan Kim, Sang Kyun Sohn, Jong Gwang Kim, Kyu Bo Lee, and Jang Soo Suh. "Rapid Helper T-Cell Recovery at 3 Months Correlates to Successful Transplant Outcomes after Allogeneic Stem Cell Transplantation." Blood 106, no. 11 (November 16, 2005): 5201. http://dx.doi.org/10.1182/blood.v106.11.5201.5201.
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Abstract Background: The current study attempted to evaluate the role of a simple quantitative measurement of peripheral lymphocyte subsets, especially CD4+ helper T-cell recovery, in predicting transplant outcomes, including overall survival (OS), non-relapse mortality (NRM), and opportunistic infections, after allogeneic stem cell transplantation (SCT). Methods: A total of 69 patients receiving an allogeneic SCT were included. The disease entities were as follows: AML 42, ALL 5, CML 15, NHL 5, and high-risk MDS 2. The peripheral lymphocyte subset counts, such as CD3+ T-cells, CD3+4+ helper T-cells, CD3+8+ cytotoxic T-cells, CD19+ B-cells, and CD56+ natural killer (NK) cells, were measured 3, 6, and 12 months post-transplant. Results: The CD19+ B-cell reconstitution was slow, while a rapid CD56+ NK cell recovery was noted. The CD4+ helper T-cell reconstitution at 3 months was strongly correlated with OS (p<0.0001), NRM (p=0.0007), and opportunistic infections (p=0.0108) when stratifying patients with cut-off value of 200×106/L CD4+ helper T-cells. A rapid CD4+ helper T-cell recovery was also independently associated with a higher CD4+ helper T-cell transplant dose (p=0.006) and donor type (p<0.001) in a regression analysis. An early CD4+ helper T-cell recovery at 3 months was associated with a subsequent faster helper T-cell recovery until 12 months, yet not with B-cell recovery. In a multivariate survival analysis, a combination of a higher CD34+ cell dose and rapid recovery of CD4+ helper T-cells at 3 months was found to a have favorable prognosis in terms of OS (p=0.001, hazard ratio [HR] 3.653) and NRM (p=0.005, HR 4.836), yet not relapse. Conclusion: A rapid recovery of the CD4+ helper T-cell count above 200×106/L at 3 months seemed to correlate with a faster immune reconstitution and predict a successful transplant outcome. Figure. The overall survival according to the helper T-cell counts at 3 months (A) and the difference of total T-(B) and helper T-cell (C) immune reconstitution within 1-year post-transplant according to helper T-cell counts at 3 months Figure. The overall survival according to the helper T-cell counts at 3 months (A) and the difference of total T-(B) and helper T-cell (C) immune reconstitution within 1-year post-transplant according to helper T-cell counts at 3 months
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Harcourt, Gillian C., Sarah Garrard, Miles P. Davenport, Anne Edwards, and Rodney E. Phillips. "HIV-1 Variation Diminishes CD4 T Lymphocyte Recognition." Journal of Experimental Medicine 188, no. 10 (November 16, 1998): 1785–93. http://dx.doi.org/10.1084/jem.188.10.1785.
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Effective long-term antiviral immunity requires specific cytotoxic T lymphocytes and CD4+ T lymphocyte help. Failure of these helper responses can be a principle cause of viral persistence. We sought evidence that variation in HIV-1 CD4+ T helper epitopes might contribute to this phenomenon. To determine this, we assayed fresh peripheral blood mononuclear cells from 43 asymptomatic HIV-1+ patients for proliferative responses to HIV-1 antigens. 12 (28%) showed a positive response, and we went on to map dominant epitopes in two individuals, to p24 Gag restricted by human histocompatibility leukocyte antigen (HLA)-DR1 and to p17 Gag restricted by HLA-DRB52c. Nine naturally occurring variants of the p24 Gag epitope were found in the proviral DNA of the individual in whom this response was detected. All variants bound to HLA-DR1, but three of these peptides failed to stimulate a CD4+ T lymphocyte line which recognized the index sequence. Antigenic variation was also detected in the p17 Gag epitope; a dominant viral variant present in the patient was well recognized by a specific CD4+ T lymphocyte line, whereas several natural mutants were not. Importantly, variants detected at both epitopes also failed to stimulate fresh uncultured cells while index peptide stimulated successfully. These results demonstrate that variant antigens arise in HIV-1+ patients which fail to stimulate the T cell antigen receptor of HLA class II–restricted lymphocytes, although the peptide epitopes are capable of being presented on the cell surface. In HIV-1 infection, naturally occurring HLA class II–restricted altered peptide ligands that fail to stimulate the circulating T lymphocyte repertoire may curtail helper responses at sites where variant viruses predominate.
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Losurdo, Giuseppe, Domenico Piscitelli, Federica Pezzuto, Francesco Fortarezza, Claudia Covelli, Antonella Marra, Andrea Iannone, et al. "T Helper Lymphocyte and Mast Cell Immunohistochemical Pattern in Nonceliac Gluten Sensitivity." Gastroenterology Research and Practice 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/5023680.
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Background and Aims. Nonceliac gluten sensitivity (NCGS) is a gluten-related emerging condition. Since few data about NCGS histopathology is available, we assessed the markers of lymphocyte and innate immunity activation. Materials and Methods. We retrieved duodenal biopsy samples of patients with NCGS diagnosis according to the Salerno criteria. We selected specimens of positive (seropositive celiac disease/Marsh 1-2 stage) and negative (normal microscopic picture) controls. Immunohistochemistry for CD3 (intraepithelial lymphocytes-IELs), CD4 (T helper lymphocytes), CD8 (T cytotoxic lymphocytes), and CD1a/CD117 (Langerhans/mast cells) was performed. ANOVA plus Bonferroni’s tests were used for statistical analysis. Results. Twenty NCGS, 16 celiac disease, and 16 negative controls were selected. CD3 in NCGS were higher than negative controls and lower than celiac disease (18.5 ± 6.4, 11.9 ± 2.8, and 40.8 ± 8.1 IELs/100 enterocytes; p<0.001). CD4 were lower in NCGS than controls and celiac disease (31.0 ± 22.1, 72.5 ± 29.5, and 103.7 ± 15.7 cells/mm2; p<0.001). CD8 in NCGS were similar to negative controls, but lower than celiac disease (14.0 ± 7.4 and 34.0 ± 7.1 IELs/100 enterocytes, p<0.001). CD117 were higher in NCGS than celiac disease and negative controls (145.8 ± 49.9, 121.3 ± 13.1, and 113.5 ± 23.4 cells/mm2; p=0.009). Conclusions. The combination of CD4 and CD117, as well as IEL characterization, may be useful to support a clinical diagnosis of NCGS.
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Semple, JW, and J. Freedman. "Increased antiplatelet T helper lymphocyte reactivity in patients with autoimmune thrombocytopenia." Blood 78, no. 10 (November 15, 1991): 2619–25. http://dx.doi.org/10.1182/blood.v78.10.2619.2619.
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Abstract Chronic autoimmune thrombocytopenic purpura (ATP) is a common hematologic disorder in which platelet-specific autoantibodies bind to platelets and enhance their destruction by the reticuloendothelial system. While there has been considerable investigation of the humoral immune abnormalities in ATP, little work has been performed on the cellular immunoregulatory aspects of this autoimmune disorder. We describe here that patients with ATP have lymphocytes that proliferate normally when stimulated by mitogens. However, when stimulated by normal control platelets in 7-day antigen-presenting cell cultures, peripheral blood mononuclear cells (PBMC) from patients with ATP proliferate at significantly higher levels (P less than .001) and their lymphocytes secrete significantly higher amounts of interleukin-2 (IL- 2) (P less than .001) than do lymphocytes from control subjects. Depletion studies with monoclonal anti-CD8 and complement did not reduce the proliferative capacity of the responding PBMC population, indicating that CD4+ T-helper cells may be responsible for the response. Phenotypic analysis of peripheral blood lymphocyte subsets from patients with ATP showed that there was a significant reduction in CD4+Leu8+ T suppressor-inducer cells (P less than .001) and a concomitant increase in CD3+DR+ activated T cells (P less than .001) and CD19+ B cells (P less than .05). These data indicate that CD4+ T- helper cells from patients with ATP are stimulated by normal platelet antigen(s) to secrete IL-2 and may modulate the enhanced antiplatelet autoantibody response.
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Semple, JW, and J. Freedman. "Increased antiplatelet T helper lymphocyte reactivity in patients with autoimmune thrombocytopenia." Blood 78, no. 10 (November 15, 1991): 2619–25. http://dx.doi.org/10.1182/blood.v78.10.2619.bloodjournal78102619.
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Chronic autoimmune thrombocytopenic purpura (ATP) is a common hematologic disorder in which platelet-specific autoantibodies bind to platelets and enhance their destruction by the reticuloendothelial system. While there has been considerable investigation of the humoral immune abnormalities in ATP, little work has been performed on the cellular immunoregulatory aspects of this autoimmune disorder. We describe here that patients with ATP have lymphocytes that proliferate normally when stimulated by mitogens. However, when stimulated by normal control platelets in 7-day antigen-presenting cell cultures, peripheral blood mononuclear cells (PBMC) from patients with ATP proliferate at significantly higher levels (P less than .001) and their lymphocytes secrete significantly higher amounts of interleukin-2 (IL- 2) (P less than .001) than do lymphocytes from control subjects. Depletion studies with monoclonal anti-CD8 and complement did not reduce the proliferative capacity of the responding PBMC population, indicating that CD4+ T-helper cells may be responsible for the response. Phenotypic analysis of peripheral blood lymphocyte subsets from patients with ATP showed that there was a significant reduction in CD4+Leu8+ T suppressor-inducer cells (P less than .001) and a concomitant increase in CD3+DR+ activated T cells (P less than .001) and CD19+ B cells (P less than .05). These data indicate that CD4+ T- helper cells from patients with ATP are stimulated by normal platelet antigen(s) to secrete IL-2 and may modulate the enhanced antiplatelet autoantibody response.
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Goseva, Zlatica, Biserka Jovkovska Kaeva, Angelko Gjorcev, Elena Jovanovska Janeva, Zoran Arsovski, Sava Pejkovska, and Aleksandra Tatabitovska. "Analysis of Lymphocyte Immunological Reactivity in Patients with Pleural Effusions of Different Etiology." Open Access Macedonian Journal of Medical Sciences 4, no. 1 (December 25, 2015): 50–53. http://dx.doi.org/10.3889/oamjms.2016.009.
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BACKGROUND: The proportion of T and B lymphocytes in pleural fluids and blood may point to the presence of local immunological phenomena in pleural disorders.AIM: Aim of study was to evaluate the lymphocyte phenotype and the ratio between helper (CD4+) and cytotoxic/suppressor (CD8+) lymphocytes in malignant and non-malignant effusions.MATERIAL AND METHODS: We studied 48 patients with pleural effusions. First group had 18 patients with tuberculosis pleural effusions; second group had 20 patients with malignant pleural fluids, third group had 10 patients with transudates and 30 healthy controls. We investigated the distribution of T and B lymphocytes, T cells with helper/inducer CD4 or suppresser/cytotoxic CD8 phenotypes and the CD16 subset.RESULTS: Results showed decreases levels of CD3, CD4, and CD16 T cells in blood of patients versus healthy controls. There were increases in the percentage of the CD3 and CD4 T cells in the pleural fluid compared with values in the blood with statistical significance in tuberculous pleurisy. The values of CD8 were similar in the pleural fluid and in blood. Levels of CD16 were non-significantly higher in pleural fluid in all groups.CONCLUSION: This study confirms the hypothesis that pleural cavity is compartment with immunological reactivity and results could be used in differential diagnosis together with other examinations.
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Choong, M. L., S. H. Ton, and S. K. Cheong. "Influence of Race, Age and Sex on the Lymphocyte Subsets in Peripheral Blood of Healthy Malaysian Adults." Annals of Clinical Biochemistry: International Journal of Laboratory Medicine 32, no. 6 (November 1995): 532–39. http://dx.doi.org/10.1177/000456329503200603.
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The lymphocyte subsets in the peripheral blood of healthy Malaysian adults (212 subjects, age 18–71 years) were analysed using a flow cytometer FACScan in an effort to establish a reference range for the lymphocyte subsets. The lymphocyte subsets studied were T cells (CD3), B cells (CD19), natural killer (NK) cells (CD3−CD16+/CD56+), helper/inducer cells (CD4), cytotoxic/suppressor cells (CD8) and the helper/suppressor ratio (CD4/CD8). The distributions of T cells, CD4 cells and CD8 cells were symmetric about their means while B cells, NK cells and CD4/CD8 ratio followed a skewed distribution. Differences in race were observed for T cells, NK cells, CD4 cells and CD4/CD8 ratio where the Indians were significantly different from the Malays and the Chinese (higher T cells, CD4 cells and CD4/CD8 ratio and lower NK cells). The B cells were significantly lower in the Chinese than the Malays and the Indians. Age differences were seen only in the Chinese where increased CD4 cells and CD4/CD8 ratio, and decreased CD8 cells were observed. A sex difference was observed only in the Chinese where the CD4/CD8 ratio was significantly higher in females than males.
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Mearns, Helen, William G. C. Horsnell, J. Claire Hoving, Benjamin Dewals, Antony J. Cutler, Frank Kirstein, Elmarie Myburgh, Berenice Arendse, and Frank Brombacher. "Interleukin-4-Promoted T Helper 2 Responses Enhance Nippostrongylus brasiliensis-Induced Pulmonary Pathology." Infection and Immunity 76, no. 12 (September 22, 2008): 5535–42. http://dx.doi.org/10.1128/iai.00210-08.
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ABSTRACT The role of CD4+ T-cell interleukin-4 (IL-4) receptor alpha (IL-4Rα) expression in T helper 2 (TH2) immune responses has not been defined. To examine this role, we infected CD4+ T-cell IL-4Rα knockout (KO) mice with the parasitic nematode Nippostrongylus brasiliensis, which induces strong host TH2 responses. Although N. brasiliensis expulsion was not affected in CD4+ T-cell IL-4Rα KO mice, the associated lung pathology was reduced. Infected CD4+ T-cell IL-4Rα KO mice showed abrogation of airway mucus production. Furthermore, CD4+ T-cell IL-4Rα KO mouse lungs contained reduced numbers of lymphocytes and eosinophils. Restimulation of pulmonary region-associated T-cell populations showed that TH2 cytokine responses were disrupted. Secretion of IL-4, but not secretion of IL-13 or IL-5, from mediastinal lymph node CD4+ T cells was reduced in infected CD4+ T-cell IL-4Rα KO mice. Restimulation of tissue-derived CD4+ T cells resulted in equivalent levels of IL-4 and IL-13 on day 7 postinfection (p.i.) in control and CD4+ T-cell IL-4Rα KO mice. By day 10 p.i. the TH2 cytokine levels had significantly declined in CD4+ T-cell IL-4Rα KO mice. Restimulation with N. brasiliensis antigen of total lung cell populations and populations with CD4+ T cells depleted showed that CD4+ T cells were a key TH2 cytokine source. These data demonstrated that CD4+ T-cell IL-4 responsiveness facilitates eosinophil and lymphocyte recruitment, lymphocyte localization, and TH2 cytokine production in the allergic pathology associated with N. brasiliensis infections.
Dissertations / Theses on the topic "Lymphocyte T CD4+ "helper""
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Le, Saout Cécile. "Rupture de la tolérance périphérique en conditions de lymphopénie : coopération entre les cellules T CD8+ et CD4+." Montpellier 2, 2009. http://www.theses.fr/2009MON20097.
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Le déclenchement de l'auto-immunité corrèle fréquemment avec un état lymphopénique dans des modèles murins expérimentaux, mais aussi chez des patients. Dans ces conditions, le système immunitaire a développé des mécanismes homéostatiques de compensation qui induisent la prolifération des cellules T naïves et leur différenciation en lymphocytes de type mémoire, en absence apparente de stimulation antigénique. Comme les conditions d'activation requises par les cellules T mémoires sont moins stringentes que celles des cellules T naïves, nous avons posé l'hypothèse que les cellules T auto-réactives, qui atteignent les organes lymphoïdes secondaires dans un environnement lymphopénique, pourraient se différencier et contourner les mécanismes de tolérance périphérique. L'utilisation d'un système murin transgénique spécifique pour un antigène modèle exprimé dans le pancréas, nous a permis de montrer que les cellules T CD8+ de type mémoire potentiellement auto-réactives, générées en conditions de lymphopénie, ne sont pas suffisantes pour induire de l'auto-immunité. Elles sont tolérisées dans les ganglions drainant le pancréas. L'induction de l'auto-réactivité nécessite l'aide des cellules T CD4+ antigène-spécifiques. Ces cellules « helper » entraînent la différenciation des cellules T CD8+ de type mémoire en cellules effectrices suite à la cross-présentation antigénique, et leur migration dans le pancréas où s'ensuit l'auto-immunité. De plus, nous avons trouvé que l'IL-2, une cytokine principalement produite par les cellules T CD4+ « helper », joue un rôle majeur dans cet effet. Ainsi, en conditions de lymphopénie, la coopération des cellules T CD4+ et CD8+ de type mémoire auto-réactives contourne la cross-tolérance et aboutit au déclenchement de l'auto-immunité. Ces études ouvrent de nouvelles perspectives, notamment pour le traitement des cancers par immunothérapie et le développement de nouvelles stratégies optimisant les réponses immunes anti-tumoralesThe onset of autoimmunity in patients as well as experimental rodent models frequently correlates with a lymphopenic state. In this condition, the immune system has evolved compensatory homeostatic mechanisms that induce quiescent naive T cells to proliferate and differentiate into memory-like lymphocytes even in the apparent absence of antigenic stimulation. Since memory T cells have less stringent requirements for activation than naïve cells, we hypothesized that auto-reactive T cells that arrive to secondary lymphoid organs in a lymphopenic environment could differentiate and bypass the mechanisms of peripheral tolerance. Utilizing a transgenic mouse system in which a model antigen is expressed in the pancreas, we have shown that potentially auto-reactive memory-like CD8+ T cells, generated under lymphopenic conditions, are not sufficient to induce auto-immunity because they are tolerized in the draining lymph nodes of the pancreas. Induction of self-reactivity required antigen-specific CD4+ T cell help. These helper cells promoted the further differentiation of memory-like CD8+ T cells into effectors in response to antigen cross-presentation with subsequent migration to the tissue of antigen expression where autoimmunity ensued. We also found that this effect is mediated by IL-2, a cytokine mainly produced by CD4 helper T cells. Thus, the cooperation between self-reactive memory-like CD4+ and CD8+ T cells under lymphopenic conditions overcomes cross-tolerance resulting in autoimmunity. These studies raise new perspectives, notably on cancer immunotherapy and the development of promising strategies optimizing anti-tumor T cell responses
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Espinosa, Carrasco Gabriel. "L'activation des cellules T CD8+ et T CD4+ en réponse aux auto-antigènes : du tissu lymphoïde à l'organe cible." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT026.
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Le système immunitaire comporte différents mécanismes de tolérance périphérique permettant de contrôler la réponse des cellules T CD8+. Dans certaines conditions encore peu connues, des cellules T potentiellement auto-réactives peuvent contourner les mécanismes de tolérance et se différencier en cellules effectrices, capables d’attaquer différentes organes de l’organisme, dans un processus d’auto-réactivité. En utilisant une souris transgénique exprimant un antigène modèle dans les cellules bêta du pancréas, j’ai étudié deux processus fondamentaux impliqués dans la différenciation des cellules T CD8+ en réponse aux antigènes du soi.1) Rôle de la translocation des lipopolysaccharides (LPS) dans la rupture de la tolérance. Nous avons préalablement démontré dans le laboratoire que des protocoles de lympho-déplétions, tels l’irradiation, étaient capables d’induire une rupture de la tolérance périphérique dans les cellules T CD8+. L’irradiation provoque la translocation des LPS des bactéries commensales vers la circulation sanguine, ce qui induit une activation du système immunitaire inné. Mes données ont montré que la translocation des LPS était corrélée avec l’activation systémique des cellules dendritiques (DC) CD11c+, en particulier les DC CD8+, responsables de la cross-présentation des auto-antigènes pancréatiques dans les tissus lymphoïdes. Alors que le traitement par des antibiotiques avant l’irradiation permet de prévenir la translocation des LPS, l’activation des DC n’est que partiellement affectée, et le développement de l’auto-immunité résultant d’une rupture de la tolérance périphérique des cellules T CD8+ ne peut pas être empêchée par le traitement.2) Visualisation de la coopération entre cellules T CD4+ et CD8+ effectrices dans la destruction des cellules bêta pancréatiques in vivo. En utilisant la microscopie intra-vitale à 2-photons, j’ai pu analyser, pour la première fois, la dynamiques des cellules T CD4+ et CD8+ auto-réactives exprimant un marqueur fluorescent, lors de l’infiltration du pancréas et du développement du diabète auto-immun. J’ai mis en évidence que l’infiltration des cellules T était accompagnée d’un remodelage de la matrice extracellulaire du pancréas, permettant la migration dirigée des lymphocytes. De plus, j’ai montré que l’arrêt MHC classe II-dépendant des cellules T CD4+, dû à des interactions avec des cellules présentatrices d’antigène recrutées au site d’inflammation et impliquant dans certains cas également les cellules T CD8+, contribuait au maintien des fonctions effectrices des cellules T CD8+The immune system has evolved multiple mechanisms of peripheral tolerance to control CD8+ T cell responses. Under particular conditions that are not yet well understood, potentially autoreactive T cells may override tolerance and differentiate into effector cells capable of targeting the own components of the organism resulting in self-reactivity. Utilizing transgenic mice expressing a model antigen in the beta cells of the pancreas, I have studied two important processes involved in CD8+ T cells differentiation in response to self-antigens. 1) Role of lipopolysaccharides (LPS) translocation in the breakdown of CD8+ T cell tolerance. It has been previously shown in our laboratory that lymphodepleting protocols, such as total body irradiation, promote breakdown of peripheral CD8+ T cell tolerance. Irradiation induces translocation of commensal bacteria LPS, a potent innate immune system activator, into the bloodstream. My data demonstrated that LPS translocation correlated with systemic activation of CD11c+ dendritic cells (DC), in particular CD8+ DC, responsible for pancreatic self-antigen cross-presentation, in lymphoid tissue. While antibiotic treatment of mice before irradiation prevented LPS translocation, DC activation was only partially affected, and onset of autoimmunity and breakdown of CD8+ T cell tolerance could not be prevented.2) Intra-vital visualization of effector CD8+ and CD4+ T cell cooperation in beta cell destruction in the pancreas. Using two-photon microscopy, I have been able, for the first time, to simultaneously analyze dynamics of fluorescently tagged autoreactive CD8+ and CD4+ T cells as they infiltrated the pancreas and induced autoimmune diabetes. I found that T cell infiltration promoted extracellular matrix remodeling in the pancreas, which in turn served as a scaffold for T cell migration. In addition, I showed that MHC class II dependent arrest of effector CD4+ T cells, due to interactions with antigen presenting cells, occasionally also implicating CD8+ T cells, provided help to effector CD8+ T cells in maintaining their effector functions
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Asrir, Assia. "Caractérisation phénotypique et fonctionnelle des différentes populations de Lymphocytes T CD4 Folliculaires Mémoires." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30084/document.
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Les LT CD4 folliculaires (TFH) forment un lignage distinct de LT contrôlant spécifiquement les lymphocytes B (LB) et la mise en place de la mémoire B. Alors que ces cellules étaient considérées comme des cellules effectrices uniquement, récemment il a été identifié, chez l'Homme et la souris, l'existence de TFH mémoires. Les TFH mémoires en tant que LT CD4 mémoires sont nécessaires, en cas de nouvelle rencontre avec l'antigène (Ag), à la mise en place d'une réponse Anticorps (Ac) rapide, efficace et de forte affinité. En effet, leur présence est corrélée à la génération et le maintien à long terme d'Ac de forte affinité lors d'infections virales. De plus, des études récentes montrent que l'analyse des TFH mémoires dans le sang périphérique peut fournir des indices pour comprendre le mode d'action des vaccins ainsi que la pathogenèse de maladies auto-immunes. Par ailleurs, dans le contexte de nombreuses maladies, de récents travaux suggèrent que l'évaluation de la fréquence et du phénotype des TFH mémoires dans le sang périphérique pourrait servir de bio-marqueur à l'établissement de diagnostique. Tout comme les cellules B mémoires qui sont subdivisées en différentes sous-populations en fonction de leur localisation et de la nature de leur Ac, différentes populations de TFH mémoires ont été récemment identifiées. Certaines se situent dans les organes lymphoïdes secondaires (OLS) drainants le site d'immunisation, de vaccination ou d'infection, ou circulantes dans les OLS non-drainants ou à proximité des plasmocytes à longue durée de vie dans la MO. Ces observations soulèvent donc la question majeure de leurs phénotypes, différences fonctionnelles et interactions face aux différentes populations de cellules B mémoires. L'objectif de mes travaux de Thèse a consisté à étudier l'hétérogénéité phénotypique et fonctionnelle présente entre ces différentes populations de TFH mémoires aux localisations diverses. De plus au vu de l'hétérogénéité existante au sein des LB mémoires (nœuds lymphatiques ou rate) et plasmocytes à longue durée de vie (MO), nous avons aussi évalué l'interaction cellulaire et fonctionnelle qui a lieu entre ces populations mémoires. Dans ce contexte, nous avons développé un modèle expérimental unique de vaccination protéique chez la souris sauvage non modifiéeT Helper Follicular (TFH) cells form a distinct lineage of helper T cells and they specifically control B cells and memory B cell generation. While these cells were considered as effector cells, recently it was identified in Human and in mouse, the existence of memory TFH cells. Memory TFH cells, as CD4 memory T cells, are necessary in case of antigen (Ag) rechallenge to establish a fast, efficient and high affinity Antibody (Ab) response. Indeed, their presence is correlated with the generation and the long-term maintenance of high affinity Ac during viral infections. Moreover, recent studies have shown that analysis of memory TFH cells in the blood may provide clues to understanding the mode of action of vaccines and the pathogenesis of autoimmune diseases. In addition, in the context of many diseases, recent works have also suggested that the frequency and phenotype of memory TFH cells in the blood could serve as a biomarker for diagnosis. Likewise to memory B cells that are subdivided into different cell populations based on their location and the nature of their Ab, different populations of memory TFH cells have recently been identified. Some are in secondary lymphoid organs (SLO) draining the site of immunization, vaccination or infection, or circulating in the non-draining SLO or near the long-lived plasma cells (PC) in bone marrow (BM). These observations raise the question of their phenotypes, functional differences and interactions with the different subsets of memory B cells. The aim of my thesis was to study the phenotypic and functional heterogeneity between the different subsets of memory TFH cells. Due to the heterogeneity of memory B cells (draining lymph nodes or non-draining spleen) and long-lived PCs (BM), we also evaluated the cellular and functional interaction that occurs between these different memories populations. In this context, we have developed a unique experimental model of protein vaccination in unmodified wild-type mice. Specifically, after immunization, we evaluated the development of memory TFH cells and memory B cells specific for the same Ag in the draining SLO and circulating in the spleen and BM. We demonstrated that local memory TFH cells (that reside in the draining SLO) exhibit a more polarized phenotype than their circulating counterparts (present in non-draining SLO)
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MacKenzie, Jason Roderick, and Jason Mackenzie@ipaustralia gov au. "The Role of Eosinophils in the Regulation of CD4+ T helper 2 Regulated Inflammation." The Australian National University. The John Curtin School of Medical Research, 2004. http://thesis.anu.edu.au./public/adt-ANU20051007.121844.
Full textAbstract:
The eosinophil is a leukocyte whose intracellular mediators are considered to play a
central role in the pathogenesis of allergic diseases, including allergic asthma, allergic
rhinitis and atopic dermatitis, and which is also involved in immunological responses to
parasites. Eosinophil differentiation and maturation from bone marrow progenitors is
regulated by interleukin-5 (IL-5), which may be secreted by T helper 2 (Th2) T
lymphocytes, and is consistently upregulated in allergic conditions. Eotaxin is a potent
chemoattractant for circulating and tissue eosinophils, and the production of this
chemokine promotes eosinophil infiltration and accumulation within sites of allergic
inflammation.¶
Eosinophils obtained from inflammatory tissues and secretions display an altered
phenotype in comparison to peripheral blood eosinophils, with increased surface
expression of major histocompatibility complex (MHC) proteins and adhesion
molecules (Hansel et al., 1991), and migration across the microvascular endothelium
may also increase their capacity to generate an oxidative burst (Walker et al., 1993;
Yamamoto et al., 2000). Eosinophils are phagocytic cells, and have been shown to
present simple (no requirement for intracellular processing) and complex antigens to
MHC-restricted, antigen-specific T lymphocytes (Del Pozo et al., 1992; Weller et al.,
1993). Furthermore, eosinophils express the costimulatory molecules required for
effective antigen presentation (Tamura et al., 1996), and ligation of costimulatory
molecules on the eosinophil cell surface can induce the release of eosinophil derived
cytokines (Woerly et al., 1999; Woerly et al., 2002). Therefore the eosinophil may also
regulate immune responses.¶
To date, no studies have demonstrated the ability of eosinophils to modulate activated T
lymphocyte function via presentation of relevant antigen in the context of MHC class II
(MHC-II), concomitant with Th2 cytokine release. In the experiments described in this
thesis, murine eosinophils have been observed to rapidly migrate to sites of antigen
deposition within the airways mucosa of naïve mice, suggesting a potential role for this
granulocyte in the primary response to inhaled antigen. However, human allergic
diseases are often diagnosed after the establishment of allergic responses, and symptom
development. Therefore, a murine model of allergic airways disease (AAD) was used to
investigate the ability for eosinophils to participate as antigen presenting cells (APCs),
and thereby modulate activated T lymphocyte function both in vitro and in vivo.
Detailed histological analysis of the pulmonary draining lymph nodes following antigen
challenge in sensitised mice revealed a rapid infiltration of eosinophils into this tissue,
which preceded the accumulation of eosinophils in bronchoalveolar lavage fluid
(BALF). This suggested that eosinophils were preferentially translocating to the
draining lymph nodes following antigen challenge, and that the subsequent
accumulation of these cells in the BALF was a consequence of continued antigen
delivery to the lower airways.¶
Eosinophil trafficking to lymphoid tissue via the afferent lymphatics was substantiated
using electron microscopy of lymph node sections and the intravenous (i.v.) transfer of
fluorescently labeled eosinophils, which did not traffic to lymph nodes via the blood.
During the resolution of AAD, eosinophils were noted for their persistence in the
pulmonary draining lymph nodes. These observations suggested a continued modulation
of T cell function by lymph node dwelling eosinophils during AAD resolution,
particularly in light of recent observations for draining lymph node T cell proliferation
following instillation of antigen-pulsed eosinophils into the allergic mouse lung (Shi et
al., 2000).¶
To further investigate the antigen presenting capacity, eosinophils were obtained from
the BALF of mice with AAD, and their surface expression of MHC class II (MHC-II)
proteins and costimulatory molecules confirmed using flow cytometric analysis. The
ability to acquire and process complex antigen both in vitro and in vivo was also
confirmed using naturally quenching fluorescenated ovalbumin (OVA), which is
degraded into fluorescent peptides by the action of intracellular proteases. Thus,
eosinophil expression of the surface molecules necessary for effective antigen
presentation was confirmed, as was their ability to process complex antigen. Further
investigations revealed that eosinophils can present complex OVA antigen to CD4+ T
lymphocytes obtained from the allergic mouse, and to in vitro derived OVA-specific
Th2 cells. In the presence of exogenous antigen, eosinophils co-cultured with T
lymphocytes were able to induce Th2 cytokine production, and demonstrated an ability
for eosinophils to modulate T lymphocyte function in vitro.¶
The ability for eosinophils to act as antigen presenting cells in vivo was also
investigated. Eosinophils obtained from the antigen-saturated lungs of OVA sensitised
and challenged mice were transferred to the peritoneal cavities of naïve host mice.
When subsequently challenged with aerosolised OVA, eosinophil recipients developed
a pulmonary eosinophilia similar to that of OVA sensitised and challenged mice. To
validate this finding, the experimental procedure was altered to accommodate the use of
non-allergy derived eosinophils, which were pulsed with OVA in vitro, prior to transfer
into naïve recipients. When subsequently challenged with aerosolised OVA, eosinophil
recipients developed a peripheral blood and pulmonary eosinophilia, and stimulation
with OVA induced IL-5 and IL-13 cytokine production from pulmonary draining lymph
node cells. Notably, the AAD induced by transfer of antigen pulsed eosinophils did not
induce detectable OVA-specific IgG1, which may be attributed to the lack of soluble
antigen required for B cell antibody production.¶
During the course of these investigations, an OVA T cell receptor (TCR) transgenic
mouse (OT-II) was procured with a view to defining the interaction between eosinophils
and activated T lymphocytes (Barnden et al., 1998). Despite having specificity for the
OVA323-339 peptide, an immunodominant epitope that skews naïve T cell responses
towards Th2 cytokine release (Janssen et al., 2000), T lymphocytes from the OT-II
mouse preferentially secreted IFN-γ in response to stimulation with either OVA peptide
or OVA. These mice were further characterised in a mouse model of AAD, and found to
be refractory to disease induction and progression, which may be attributed to
significant IFN-γ secretion by transgenic CD4+ T lymphocytes during antigen
sensitisation. Indeed, these cells were noted for their ability to attenuate pulmonary
eosinophilia when transferred to OVA sensitised and challenged wild type mice,
although serum OVA-specific IgG1, peripheral blood eosinophilia levels and airways
response to methacholine challenge remained intact.¶
Knowledge of the biased Th1 phenotype in naïve OT-II provided a unique opportunity
to investigate the fate of T lymphocytes bearing high affinity OVA-specific TCRs
following neonatal antigen exposure to soluble OVA. In a previous study, subcutaneous
(s.c.) administration of soluble OVA to wild type neonatal mice was suspected to have
deleted OVA-specific T cells from the T cell repertoire (Hogan et al., 1998a). Using
flow cytometry and TCR specific antibody, the delivery of s.c. OVA to OT-II neonates did not alter transgenic T cell populations in adult mice. Instead, it was surprising to
find a skewing towards the Th2 phenotype and loss of IFN-γ secretion following OVA
sensitisation and challenge in adult mice. A mechanism for this reprogramming of the
transgenic T cell from the Th1 to a Th2 phenotype following OT-II neonatal exposure
to soluble OVA is proposed, and further experimentation may validate this hypothesis.¶
In conclusion, eosinophils residing in the allergic lung have the capacity to interact with
activated T cells, both within this tissue and the draining lymph nodes. Despite their
relative inefficiency as antigen presenting cells (Mawhorter et al., 1994), eosinophils
may participate en masse in the serial triggering of activated TCRs, and provide
appropriate costimulatory signals that modulate T lymphocyte function. Through the
elaboration of Th2 cytokines and stimulation of T cell proliferation, antigen presenting
eosinophils may transiently prolong or exacerbate the symptoms of allergic diseases.
Alternatively, eosinophils presenting relevant antigens may inhibit T cell activity via
degranulation, and such activity has recently been observed in a parasite model (Shinkai
et al., 2002). Finally, experiments in the OT-II mouse have provided valuable
information to suggest that therapies designed to modulate eosinophil numbers in
allergic tissues through the secretion of opposing cytokines such as IFN-γ, may be of
limited benefit. The results shown here suggest that airways dysfunction remains intact
despite significantly reduced pulmonary eosinophilia
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Binet, Bénédicte. "Régulation épigénétique de la programmation des lymphocytes T CD4 par SETDB1." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30217.
Full textAbstract:
Chez les mammifères, les lymphocytes T CD4 sont essentiels à la défense de l’organisme contre des infections par des pathogènes ou le développement de tumeurs. Après activation, les lymphocytes T CD4 naïfs ont la capacité de se différencier en divers lymphocytes T helper (Th1, Th2, Th17…) en fonction des signaux reçus. Le choix du lignage permet d’adapter le phénotype et la fonction des cellules au type de danger détecté. Le processus de différenciation des lymphocytes T helper implique l’établissement de programmes d’expression des gènes distincts. La dynamique et la stabilité de ces programmes sont notamment régulées par l’activité d’éléments cis-régulateurs. Le but de ma thèse était de comprendre les mécanismes épigénétiques qui contrôlent la programmation des lymphocytes T CD4. Dans cet objectif, nous avons étudié le rôle de la H3K9 méthyl-transférase SETDB1 dans la différenciation des lymphocytes T CD4 en Th1 et Th2, deux lignages T helper fortement antagonistes. Nous avons découvert que SETDB1 réprime de manière critique le programme d’expression des gènes Th1. En effet, en l’absence d’expression de Setdb1, la différenciation Th1 est exacerbée. De plus, lorsqu’elles sont exposées à un signal pro-Th1, les cellules Th2 franchissent les barrières de lignage et se transdifférencient en Th1. De manière surprenante, SETDB1 ne cible pas directement les enhancers Th1. Au contraire, l’enzyme dépose de manière type cellulaire spécifique la marque répressive H3K9me3 au niveau d’un set restreint de rétrovirus endogènes (ERVs). Des analyses bio-informatiques ont indiqué que les rétrotransposons ciblés sont fortement associés à des gènes impliqués dans les processus immunitaires. La suite de ces analyses a indiqué que ces ERVs flanquent et répriment l’activité d’éléments cis-régulateurs des gènes Th1, ou agissent eux même comme des enhancers du lignage. En conclusion, la déposition de H3K9me3 par SETDB1 garantit l’intégrité des lymphocytes T helper en réprimant un panel d’ERVs qui ont été exaptés en modules cis-régulateurs pour façonner et contrôler le réseau de gènes Th1CD4 T lymphocytes play a central role in the defense of mammal organisms against infections by pathogens and the development of tumors. Upon activation, naïve CD4 T cells differentiate into distinct helper cell subsets depending on environmental cues. T helper cells are key players of the immune system as they finely orchestrate immune responses in a danger-adapted manner. The process of T helper differentiation relies on the establishment of complex and lineage-specific gene expression programs. The dynamics and stability of these programs are regulated at the chromatin level through epigenetic control of cis-regulatory elements. My thesis objective was to investigate the epigenetic pathways involved in the regulation of enhancer activity in CD4 T cells. In this purpose, we studied the role of the H3K9 specific methyltransferase SETDB1 in the differentiation of Th1 and Th2 cells, which are strongly antagonistic. We report that SETDB1 critically represses the Th1 gene expression program. Indeed, Setdb1-deficient naïve T cells show exacerbated Th1 priming. Moreover, when exposed to a Th1-instructive signal, SETDB1-deficient Th2 cells cross lineage boundaries and transdifferentiate into Th1 cells. Surprisingly, SETDB1 does not directly target Th1 enhancers to heterochromatin. Instead, SETDB1 deposits the repressive H3K9me3 mark at a restricted and cell type specific set of endogenous retroviruses, strongly associated with genes involved in immune processes. Further bioinformatic analyses indicated that these retrotransposons flank and repress Th1 gene cis-regulatory elements or behave themselves as Th1 gene enhancers. Thus, H3K9me3 deposition by SETDB1 ensures T cell lineage integrity by repressing a repertoire of ERVs that have been exapted into cis-regulatory modules to shape and control the Th1 gene network
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Barron, Luke. "The roles of Bim-dependent apoptosis in controlling the responses of CD4+ T helper lymphocytes." Diss., Search in ProQuest Dissertations & Theses. UC Only, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3261259.
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Dosset, Magalie. "Caractérisation et influence des lymphocytes T CD4 anti-télomérase dans les cancers." Thesis, Besançon, 2012. http://www.theses.fr/2012BESA3014/document.
Full textAbstract:
L’histoire naturelle du cancer implique des interactions entre la tumeur et les mécanismes de défense de l’hôte, tout particulièrement avec le système immunitaire adaptatif. Ainsi la transformation de cellules normales en cellules malignes peut engendrer l’expression d’antigènes tumoraux reconnus par les lymphocytes T. Plusieurs sous-populations de lymphocytes T (LT) CD4 contrôlent les réponses antitumorales, parmi elles, les LT CD4 helper de type-1 (Th1) jouent un rôle activateur majeur de l’immunité à médiation cellulaire antitumorale. Ils deviennent actifs grâce à la reconnaissance des peptides de 15 à 20 acides aminés dérivés d’antigènes tumoraux et présentés par les molécules HLA de classe II. Ils sont nécessaires à l’induction et la fonction des cellules effectrices dirigées contre les tumeurs notamment les lymphocytes T CD8 cytotoxiques (CTL). De plus la présence de lymphocytes CD4 Th1 infiltrant les tumeurs est souvent associée à un bon pronostic chez les patients. A l’aide d’un modèle in vitro chez l’homme et in vivo chez des souris transgéniques HLA, nous avons identifié quatre nouveaux peptides CD4 dérivés de la télomérase (TERT) un antigène de tumeur exprimé dans la majorité des cancers humains. Ces peptides appelés «Universal Cancer Peptide, UCP» se lient à la majorité des allèles HLA-DR et sont capables d’activer spécifiquement les LT CD4 de type-1. Des LT CD4 circulants spécifiques des UCP sont naturellement détectables dans plusieurs cancers humains mais absents chez des individus sains. Des clones T CD4 spécifiques des UCP générés à partir des lymphocytes de patients, produisent de forts taux d’IFN, TNF, et d’IL-2, cytokines associées à la polarisation Th1. L’analyse par ELISPOT IFN, de LT CD4 anti-UCP circulants au sein d’une cohorte de 84 patients atteints de cancers bronchiques métastatiques a montré la présence naturelle de ces lymphocytes chez 38 % des patients. De plus un effet bénéfique de la présence de cette réponse sur la survie globale a été observé chez les patients ayant une réponse clinique objective après chimiothérapie (13 vs 10 mois, P< 003). In vivo, l’immunisation de souris transgéniques HLA-A2/HLA-DR1 (Tg A2/DR1) avec les peptides UCP stimule des réponses T CD4 spécifiques caractérisées par une polarisation Th1. Nous avons montré que la présence in vivo de LT CD4 anti-UCP est nécessaire pour l’induction de réponses CTL antitumorales efficaces. Ainsi chez des souris co-immunisées en présence d’un peptide UCP, on observe un accroissement en nombre et de la qualité des réponses CTL proportionnellement à l’aide délivrée par les LT CD4 anti-UCP. L’induction de LT CD4 anti-UCP s’accompagne également d’une activation des cellules dendritiques in vivo via un mécanisme impliquant CD40L, IFN et GM-CSF. Dans un modèle de mélanome transplantable chez les souris Tg A2/DR1 nos résultats ont montré qu’une vaccination thérapeutique comportant un peptide UCP favorise un meilleur recrutement de CTL fonctionnels dans les tumeurs et améliore ainsi l’efficacité antitumorale du vaccin. Ces résultats confirment le rôle antitumoral majeur des lymphocytes CD4 Th1 et soulignent l’intérêt clinique de stimuler des réponses T CD4 spécifiques d’antigènes tumoraux de relevance clinique comme TERTRecent advances in immunology have now validated the concept of cancer immunosurveillance and the leading role of adaptative T cell immunity. Until a few years ago, antitumor CD8 T cell responses have been the most studied due to their direct cytotoxic activity on tumor cells. On the other hand, study of antitumor CD4 T cell responses are even more challenging because of the heterogeneity and plasticity of the various CD4 T cells subpopulations described. Among them, CD4 T helper type-1 cells (Th1), mainly characterized by the production of IFN, control the activation of antitumor cellular immunity. Thus, stimulation of specific CD4 Th1 cells may have a major interest for the development of anticancer immunotherapies. During this research thesis, we characterized novel HLA class II epitopes derived from a relevant tumor antigen, telomerase (TERT), and studied their capacities to stimulate specific CD4 Th1 cell responses. Using a method based on predictive immunology, we identified 4 peptides derived from TERT, referred as « Universal Cancer Peptides » (UCPs), enable to bind the most commonly found HLA-DR alleles in human. Using HLA-A2/HLA-DR1 transgenic mouse model, we first evaluated the in vivo immunogenicity of these peptides. Immunization of mice with UCPs induces high avidity specific CD4 T cells. The study of their polarization showed that UCP-specific CD4 T cells do not produce IL-4, -5, -10 or -17 cytokines, excluding a Th1, Treg or Th17 differentiation. In contrast, we measured high amount of IFN and IL-2 which characterize a Th1 pattern. The study of helper role allow us to demonstrate that CD8 peptide-based vaccinations in presence of UCPs enhance the efficacy of tumor specific CTL responses. Indeed, the intensity of these responses is strongly correlated with that of UCP-specific CD4 T cells induced in vivo. Furthermore, the stimulation of UCP-specific CD4 T cells promotes activation and IL-12 release by dendritic cells through a mechanism that involves IFN, GM-CSF and CD40L. We also demonstrated the antitumor efficacy of UCPs during a therapeutic vaccination in mice, as well as their capacity to foster the recruitment of specific CD8 T cells at the tumor site. In addition, the presence of naturally occurring UCP-specific CD4 T cell responses was found in different types of cancers such as leukemia, lung, colorectal or renal cancers. A study conducted in a cohort of 84 metastatic lung cancer patients revealed a synergistic effect of spontaneous UCP-specific CD4 Th1 and chemotherapy-treatment. Altogether, this study provides further evidences that stimulation of antitumor CD4 Th1 cells is a powerful method to improve cancer vaccines and also highlights the interest of TERT-derived UCPs for the innovative monitoring of antitumor CD4 T cell responses
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Jaafoura, Salma. "Mémoire lymphocytaire T et persistance virale." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA114847.
Full textAbstract:
Au cours d’une réponse immunitaire primaire, les lymphocytes T CD8 mémoires émergent à partir d'un environnement de forte activation immunitaire. Les cellules régulatrices T CD4 FoxP3+ (LTregs) jouent un rôle clé de suppression de la réponse immunitaire. Nous montrons que les LTregs sont nécessaires pour la génération d’une réponse mémoire T CD8 fonctionnelle. En absence de LTregs lors du priming, les LT CD8 mémoires générées prolifèrent faiblement et ne parviennent pas à se différencier après une réactivation antigénique en effecteurs cytotoxiques secondaires fonctionnelles. Nous suggérons que les LTregs agissent tôt, lors de la phase d'expansion des LT CD8, en réduisant l’exposition des précurseurs mémoires T CD8 à l'interleukine-2. Ce nouveau rôle crucial des LTregs a des implications pour le développement optimal de vaccin.Chez les patients sous traitement antirétroviral efficace et prolongée (ART), le VIH peut persister dans un petit pool de cellules T CD4 mémoires quiescentes de longue durée de vie infectées par du virus latent intégré. Ce réservoir latent comprend différentes sous-populations mémoires. Nos résultats suggèrent une contraction progressive de la taille du réservoir latent autour d'un noyau formé de sous-populations T CD4 mémoires moins différenciées (centrales mémoires TCM et souches mémoires TSCM). Ce processus très lent semble dépendre de la taille initiale et du taux de décroissance qui diffère entre les sous-populations mémoires infectées de manière latente. Nos résultats suggèrent également une extrême stabilité du sous-réservoir TSCM, dont la taille est directement liée à l'exposition cumulée au virus plasmatique avant le début du traitement ART, soulignant l'importance d'une initiation précoce du traitement antirétroviral efficace. La présence de cette dynamique intrinsèque dans le réservoir latent peut avoir des implications pour la conception de stratégies optimales de purge thérapeutique contre le VIHDuring the primary immune response, CD8 memory emerges from an environment of strong immune activation. The FoxP3 regulatory CD4 T-cell subset (Treg) is known as a key suppressive component of the immune system. We report that Tregs are required for the generation of functional CD8 memory. In the absence of Tregs during priming, the resulting memory cells proliferate poorly and fail to differentiate into functional cytotoxic secondary effectors following antigen reactivation. We find that the Tregs act early, during the expansion phase of primary CD8 effectors, by fine tuning interleukin-2 exposure of CD8 memory precursors. This crucial new role of Tregs has implications for optimal vaccine development. In patients who are receiving prolonged antiretroviral treatment (ART), HIV can persist within a small pool of long-lived resting memory CD4 T cells infected with integrated latent virus. This latent reservoir involves distinct memory subsets. We provide results that suggest a progressive reduction of the size of the blood latent reservoir around a core of less-differentiated memory subsets (central memory and stem cell-like memory).This process appears to be driven by the differences in initial sizes and decay rates between latently infected memory subsets. Our results also suggest an extreme stability of the TSCM sub-reservoir, the size of which is directly related to cumulative plasma virus exposure before the onset of ART, stressing the importance of early initiation of effective ART. The presence of these intrinsic dynamics within the latent reservoir may have implications for the design of optimal HIV therapeutic purging strategies
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Claireaux, Mathieu. "Analyses phénotypique et fonctionnelle des cellules T CD4+ spécifiques du VIH chez les patients contrôlant spontanément l’infection à VIH." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC264/document.
Full textAbstract:
Les Contrôleurs du VIH sont de rares individus capables de contrôler spontanément la réplication virale en l’absence de traitement. De nombreuses études montrent que les Contrôleurs développent des réponses T antivirales remarquablement efficaces. Les cellules T CD4+ spécifiques de Gag pourraient jouer un rôle particulier car cette population est préservée en comparaison aux patients traités et corrèle négativement avec la charge virale. Afin d’étudier cette population, nous avons réalisé une analyse transcriptionnelle et protéique multiplexée sur cellule unique, à partir de cellules T CD4+ détectées ex vivo par marquage tétramère de CMH-II contre le peptide Gag293 (Tet+). Nous avons comparé l’expression de 44 gènes et 6 protéines membranaires chez 9 patients Contrôleurs et 9 patients traités. Nous avons d’une part validé la forte fréquence de cellules T CD4+ Tet+ chez les Contrôleurs en comparaison aux patients traités et, d’autre part, montré que les cellules T CD4+ Tet+ des Contrôleurs, étaient activées et engagées dans une différenciation Th1 avancée et présentant un profil cytotoxique. De plus, les cellules T CD4+ Tet+ de Contrôleurs ont montré un état d’épuisement limité, reflété par une expression faible de PD-1, qui pourrait être l’une des raisons du maintien de leur fréquence et de leurs fonctions. Dans une deuxième étude, nous avons étudié les cellules T folliculaires « helper » (Tfh) dans la population T CD4+ spécifique de Gag chez les Contrôleurs du VIH. Les Tfh jouent un rôle essentiel dans la maturation d’affinité des anticorps en aidant les cellules B. Afin de déterminer si ce sous-type cellulaire joue un rôle dans le contrôle de l’infection à VIH, nous avons analysé le phénotype et la fonction des Tfh circulantes (cTfh) : cellules T CD4+ CD45RA- CXCR5+). Nous avons utilisé un marquage tétramère de CMH-II contre le peptide Gag293, pour détecter les cTfh spécifiques du VIH (cTfh Tet+), et nous avons montré que cette population est préférentiellement maintenue chez les Contrôleurs du VIH. L’analyse phénotypique de la population cTfh Tet+ a montré une intensité d’expression (MFI) de PD-1 plus importante dans le groupe de patients traités, suggérant une activation immune anormale chez ces patients. La fonction des cTfh, analysée pour leur capacité à induire la sécrétion d’IgG en coculture avec des cellules B mémoires autologues, n’a pas montré de différences majeures entre les groupes en terme de production d’IgG totales. Cependant, la production d’IgG spécifiques anti-VIH est significativement plus efficace chez les Contrôleurs, en particulier pour la réponse anti-Env qui est plus de 30 fois supérieure à celle des patients traités. Enfin, la fréquence des cTfh Tet+ a corrélé positivement avec la production d’IgG spécifiques, supportant l'idée d'un rôle important de la fonction Tfh dans la réponse humorale anti-VIH. L’ensemble de ces résultats indique que la population T CD4+ spécifique de Gag supporte chez les Contrôleurs les deux bras de la réponse immunitaire antivirale : d’une part, une réponse de type cellulaire Th1 montrant un profil cytotoxique et, d’autre part, une réponse de type humorale, reflétée par des interactions cTfh/B préservées, résultant en une réponse B mémoire vigoureuse. Le maintien de la fonction et de la fréquence de ces cellules spécifiques de Gag pourrait donc jouer un rôle important dans le contrôle du VIHHIV Controllers are rare individuals able to spontaneously control viral replication in the absence of treatment. Several studies showed that controllers develop effective anti-viral T cell responses. Gag-specific CD4+ T cells could play a particular role in HIV control, because this population is preserved in comparison with the treated patients and correlates negatively with the viral load. In order to study this population, we performed a multiplexed single cell transcriptional and protein analysis from CD4+ T cells detected ex vivo by MHC-II tetramer labeling against the Gag293 peptide (Tet+). We compared the expression of 44 genes and 6 surface proteins in 9 Controllers patients and 9 treated patients. Firstly, we validated the high frequency of Tet+ CD4+ T cells in controllers compared to the treated patients, then we showed that Tet+ CD4+ T cells from controllers were activated and engaged in advanced Th1 differentiation with a cytotoxic profile. In addition, Tet+ CD4+ T cells from controllers showed a limited state of exhaustion, reflected by a lower expression of PD-1, which could be one of the reasons for maintaining their frequency and functions. In a second study, we studied follicular helper T cells (Tfh) among the Gag-specific CD4+ T cell population of HIV controllers. Tfh plays an essential role in the affinity maturation of the antibody response by providing help to B cells. To determine whether this CD4+ T cell subset may contribute to the spontaneous control of HIV infection, we analyzed the phenotype and function of circulating Tfh (cTfh: T cells CD4+ CD45RA- CXCR5+). We performed a MHC-II tetramer labeling against Gag293 peptide to detect HIV-specific cTfh (cTfh Tet +), and showed that this population is preferentially maintained in HIV controllers. Phenotypic analysis of Tet+ cTfh population showed a higher intensity of PD-1 expression (MFI) in the treated group suggesting abnormal immune activation in these patients. The function of cTfh, analyzed by the capacity to promote IgG secretion in cocultures with autologous memory B cells, did not show major differences between groups in terms of total IgG production. However, the production of HIV-specific IgG is significantly more efficient in the controller group, especially for the anti-Env response that is more than 30-fold greater than those of the treated patients. Finally, the frequency of Tet+ cTfh correlated positively with the production of specific IgG, supporting the idea of an important role of Tfh function in the humoral antiHIV response. Taken together, these results indicate that Gag-specific CD4+ T cell population supports the two arms of the antiviral immune response in HIV controllers: the cell-mediated response through a preferential differentiation toward Th1 cell type showing a cytotoxic profile, and the humoral response, reflected by preserved cTfh / B interactions, resulting in a vigorous memory response. Maintaining the function and frequency of these Gag-specific CD4+ T cells could therefore play an important role in HIV control
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Ghenassia, Alexandre. "Induction de réponses mémoires lymphocytaires T CD8 et protection vaccinale après transfert de gènes par le vecteur AAV recombinant." Thesis, Sorbonne Paris Cité, 2015. http://www.theses.fr/2015PA05T032/document.
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La mémoire immunologique est le mécanisme biologique fondamental à la base du développement de la vaccination. La compréhension de ce mécanisme ainsi que de ses interactions avec les différents acteurs du système immunitaire a permis l’élaboration de vaccins qui sont aujourd’hui les garants d’une protection accrue face à l’émergence de maladies infectieuses potentiellement mortelles. La voie d’injection et le mode de transfert de ces vaccins sont des paramètres majeurs à prendre en considération car ils définissent une modulation des réponses immunitaires et de leurs spécificités d’action. De nos jours, seule la voie intramusculaire demeure la voie majoritaire d’administration de vaccins lors de la prophylaxie primaire en santé humaine. Au cours de notre étude, nous nous sommes intéressés à comparer l’injection d’un antigène (l’ovalbumine) selon deux voies d’administration : la voie intramusculaire et la voie intradermique. Nous nous sommes également appuyés sur une technologie du laboratoire qui consiste à transférer des gènes par des vecteurs AAV2/1 recombinants. Nous disposions de deux constructions de ces vecteurs ayant une spécificité pour cibler les cellules musculaires et permettant l’apport d’un effet auxiliaire par les lymphocytes T CD4+ lors d’injections dans des souris femelles. De plus, une de ces constructions nous permettait d’éviter la voie de présentation directe de l’antigène par les cellules dendritiques (DCs) aux lymphocytes T CD8+. Les capacités modulatrices de ces vecteurs nous permirent de montrer pour la première fois que le vecteur AAV2/1 recombinant était capable de faire exprimer un transgène au sein de la peau et d’y générer une réponse cellulaire forte. Nous avons également montré qu’il existait une synergie d’action entre l’effet auxiliaire et la voie intradermique qui améliorait considérablement les réponses cellulaires issues de la présentation croisée d’antigène. Enfin, nous avons pu démontrer que les lymphocytes T CD8+ générés suite à cette synergie d’action présentaient un profil phénotypique de cellules mémoires polyfonctionnelles et capables de protéger l’hôte face à un challenge pathogéniqueImmunological memory is the fundamental biological mechanism at the beginning of the development of vaccination. Understanding this mechanism and its interactions with the various players of the immune system has allowed the development of vaccines that are today the most effective barrier against the emergence of life-threatening infectious diseases. Route of injection and the nature of carriers of these vaccines are key parameters to be taken into consideration because they define a modulation of immune responses and their specific features. Nowadays, only the intramuscular injection route remains the major route of vaccines injection in the context of primary prophylaxis in human health. During our study, we were interested in comparing the injection of antigen (ovalbumin) following two routes of administration: intramuscular and intradermal routes. We also relied on a technology in the laboratory that involves the transfer of genes by rAAV2/1 vectors. We had two constructs of these vectors having specificity to target skeletal muscle cells and allowing us to provide a helper effect from CD4+ T cells during injections into female mice recipients. Moreover, one of these constructs enabled us to avoid the direct presentation of antigens by dendritic cells (DCs) to CD8+ T cells. The capacity of modulation of these vectors allowed us to show for the first time that the rAAV2/1 vector was able to trigger the expression of a transgene in the skin, and there to generate a strong cellular response. We have also shown that CD4+ T cell help and the intradermal route of immunization synergize to improve greatly cellular responses from the cross-presentation of antigens. Finally, we have demonstrated that CD8+ T cells generated following this synergism exhibited a phenotypic profile of polyfunctional memory cells and able to protect the host against a pathogenic challenge
Books on the topic "Lymphocyte T CD4+ "helper""
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Takumi, Takeuchi, ed. The Th1, Th2 paradigm and transplantation tolerance. Austin: R.G. Landes, 1994.
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Kiziroglu-Doganoglu, Fula. Tolerance induction at the CD4+ T helper precursor cell level in a veto-like manner. 1992.
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Kim, Do-Kyun. Similarities and differences in the mechanisms of signal transduction of murine cytolytic and helper T lymphocyte clones. 1988.
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Henggeller, Michelle. Infections in the HIV Patient. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199976805.003.0055.
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The hallmark of the human immunodeficiency virus (HIV) patient with a cluster of differentiation 4 (CD4) T lymphocyte count below 200 is the development of opportunistic infections. Although the use of antiretroviral therapy (ART) has decreased the incidence of these infections, they continue to be a major case of morbidity and mortality in the patient with HIV. These infections can be respiratory in nature and present with cough or shortness of breath: Pneumocystis pneumonia (PCP), tuberculosis (TB), aspergillosis, and coccidioidomycosis. Neurological infections, which can present with change in mental status, include toxoplasmosis encephalitis (TE), meningoencephalitis, John Cunningham (JC) virus, and progressive multifocal leukoencephalopathy (PML). Gastrointestinal infections, such as Cryptosporidium, present with abdominal pain and diarrhea. Viral changes can result from cytomegalovirus retinitis. Fever or nonspecific symptoms can result from disseminated Mycobacterium Avium complex disease, histoplasmosis, bartonellosis, and cytomegalovirus.
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Hull, Mark, and Steven C. Reynolds. HIV in the critically ill. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0291.
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It has been over 30 years since the recognition of the acquired immune deficiency syndrome (AIDS), linked to infection with human immunodeficiency virus (HIV). Opportunistic infections arise in the setting of decreases in the CD4+ T-lymphocyte count. Advances in the safety, and effectiveness of combination antiretroviral therapy (cART) have led to substantial improvements in life-expectancy for individuals accessing successful therapy. As such individuals are likely to be admitted to the intensive care unit (ICU) for conditions un-related to HIV, although presentations due to opportunistic infections and malignancies must be considered in those with previously undiagnosed infection or in those patients non-adherent to cART.. Individuals receiving cART must undergo careful evaluation for potential drug–drug interactions with other medications. Treatment interruption of cART is not generally advised due to risk of rebound viraemia and potential development of resistance.. Immune reconstitution inflammatory syndrome may be considered in those with recent cART initiation.
Book chapters on the topic "Lymphocyte T CD4+ "helper""
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Tieri, P., V. Prana, T. Colombo, D. Santoni, and F. Castiglione. "Multi-scale Simulation of T Helper Lymphocyte Differentiation." In Advances in Bioinformatics and Computational Biology, 123–34. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-12418-6_16.
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Laurence, Jeffrey. "CD4+ and CD8+ T Lymphocyte Activation in HIV Infection." In Advances in Experimental Medicine and Biology, 1–15. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1995-9_1.
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Lamb, J. R., M. Feldmann, N. Green, R. A. Lerner, and E. D. Zanders. "Antigen Recognition by Human Influenza Virus Specific Helper T Lymphocyte Clones." In Human T Cell Clones, 117–24. Totowa, NJ: Humana Press, 1985. http://dx.doi.org/10.1007/978-1-4612-4998-6_11.
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Read, Kaitlin A., Michael D. Powell, Bharath K. Sreekumar, and Kenneth J. Oestreich. "In Vitro Differentiation of Effector CD4+ T Helper Cell Subsets." In Mouse Models of Innate Immunity, 75–84. New York, NY: Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9167-9_6.
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Braciale, Vivian Lam. "CD4+ and CD8+ Cytolytic T Lymphocyte Recognition of Viral Antigens." In Cytotoxic Cells: Recognition, Effector Function, Generation, and Methods, 358–65. Boston, MA: Birkhäuser Boston, 1993. http://dx.doi.org/10.1007/978-1-4684-6814-4_34.
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Auderset, Floriane, Manuel Coutaz, and Fabienne Tacchini-Cottier. "The Role of Notch in the Differentiation of CD4+ T Helper Cells." In Current Topics in Microbiology and Immunology, 115–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/82_2012_227.
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Takayama, Hajime. "Properties of Cytotoxicity Mediated by CD4+, Perforin-Negative T-Lymphocyte Clones." In Cytotoxic Cells: Recognition, Effector Function, Generation, and Methods, 190–95. Boston, MA: Birkhäuser Boston, 1993. http://dx.doi.org/10.1007/978-1-4684-6814-4_17.
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Killeen, N., and D. R. Littman. "The Regulation and Function of the CD4 Coreceptor During T Lymphocyte Development." In Current Topics in Microbiology and Immunology, 89–106. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-79798-9_5.
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Jordan, Mark L., Ann Carlson, Rosemary A. Hoffman, and Richard L. Simmons. "Differential Effects of Helper and Cytotoxic T-Lymphocyte Clones on Macrophage Function." In Immunobiology of HLA, 495–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-662-39946-0_211.
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Bottomly, K., and C. A. Janeway. "The Activation of Immune Effector Cells: Role of Helper and Inflammatory CD4 T Cell Subsets." In Immune Consequences of Trauma, Shock, and Sepsis, 45–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-73468-7_5.
Full textConference papers on the topic "Lymphocyte T CD4+ "helper""
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Koller, U., I. Pabinger, K. Lechner, and W. Knapp. "HEAT INACTIVATED HIGHLY PURIFIED FACTOR VIII CONCENTRATE IN THE TREATMENT OF HEMOPHILIACS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644057.
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51 severe hemophiliacs who had previously been treated with not virus-inactivated intermediate purity factor VIII concentrates were divided into two groups according to their immunological status. Group A (n=23) consisted of patients with CD4/CD8 (helper/suppressor) T cell ratio of 1.0, group B (n=28) of . patients with a ratio of 1.0. In patients of group A treatment was switched in May 1983 to highly purified heat inactivated factor VIII concentrate (BEHRINGWERKE GmbH, Marburg) whereas patients of group B continued to receive intermediate purity factor VIII concentrate. In both groups laboratory tests (clinical investigation, routine liver function tests, differential blood count, lymphocyte subpopulations and quantitative immunoglobulin analysis) were performed in May 1983 and repeated 6, 12 and 18 months thereafter. In group A a significant reduction (p 0.005) of CD8 positive cells from 10587/μl (median) to 540/μl (18 months) was observed; no significant changes of CD8 positive cells occurred in group B. CD4/CD8 ratio rose from 0.58 to 0.86 in group A (p = 0.005) and remained unchanged in group B (1.38 versus 1.23). Serum IgG decreased in both groups but was more pronounced in group A. Thus treatment with heat inactivated highly purified factor VIII improved the immunological status of hemophiliacs with an inverse ratio. Retrospective analysis of antibodies to HIV, however, showed that most of the patients of group A were antibody positive (n=21), but the 2 negative patients remained negative. In group B of the 10 HIV negative patients one became positive, all others did not change. Whether this improvement of immunological laboratory findings is of clinical relevance, remains to be established, particularly with respect to the high incidence of antibody positive patients within group A.
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Willard-Gallo, K., S. Garaud, L. Buisseret, C. Gu-Trantien, E. Migliori, J.-N. Lodewyckx, C. Naveaux, et al. "Abstract P5-01-02: Characterization of follicular helper CD4 T cells and B cells resident in peritumoral tertiary lymphocyte structures as specific markers for an immunological grade in breast cancer." In Abstracts: Thirty-Sixth Annual CTRC-AACR San Antonio Breast Cancer Symposium - Dec 10-14, 2013; San Antonio, TX. American Association for Cancer Research, 2013. http://dx.doi.org/10.1158/0008-5472.sabcs13-p5-01-02.
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Zhang, Yaqing, Wei Yan, Esha Mathew, Filip Bednar, Shanshan Wan, Meredith A. Collins, Rebecca A. Evans, Theodore H. Welling, Robert H. Vonderheide, and Marina Pasca di Magliano. "Abstract A48: CD4+ T lymphocyte ablation prevents pancreatic carcinogenesis in mice." In Abstracts: AACR Special Conference on Pancreatic Cancer: Innovations in Research and Treatment; May 18-21, 2014; New Orleans, LA. American Association for Cancer Research, 2015. http://dx.doi.org/10.1158/1538-7445.panca2014-a48.
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Zhang, Yaqing, Wei Yan, Esha Mathew, Filip Bednar, Shanshan Wan, Meredith A. Collins, Rebecca A. Evans, Theodore H. Welling, Robert H. Vonderheide, and Marina Pasca di Magliano. "Abstract PR11: CD4+ T lymphocyte ablation prevents pancreatic carcinogenesis in mice." In Abstracts: AACR Special Conference on Pancreatic Cancer: Innovations in Research and Treatment; May 18-21, 2014; New Orleans, LA. American Association for Cancer Research, 2015. http://dx.doi.org/10.1158/1538-7445.panca2014-pr11.
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Su, X., L. Li, Q. Li, and C. Zhao. "Pulmonary and Splenic Responses in Influenza A Virus Infected CD4+ T Lymphocyte Socs3-Deleted Mice." In American Thoracic Society 2020 International Conference, May 15-20, 2020 - Philadelphia, PA. American Thoracic Society, 2020. http://dx.doi.org/10.1164/ajrccm-conference.2020.201.1_meetingabstracts.a7424.
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Nwabugwu, Chinyere I., Kavya Rakhra, Dean W. Felsher, and David S. Paik. "A tumor-immune mathematical model of CD4+ T helper cell dependent tumor regression by oncogene inactivation." In 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2013. http://dx.doi.org/10.1109/embc.2013.6610554.
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Ganesan, Anusha Preethi. "Abstract LB-352: CD4+ follicular helper-like T cells are key players in anti-tumor immunity." In Proceedings: AACR Annual Meeting 2020; April 27-28, 2020 and June 22-24, 2020; Philadelphia, PA. American Association for Cancer Research, 2020. http://dx.doi.org/10.1158/1538-7445.am2020-lb-352.
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Grabowska, Agnieszka K., Stephanie Hoppe, Renata Blatnik, and Angelika B. Riemer. "Abstract 1267: Identification of HPV-derived CD4+ T-helper epitopes for improving therapeutic anti-HPV vaccine potency." In Proceedings: AACR 104th Annual Meeting 2013; Apr 6-10, 2013; Washington, DC. American Association for Cancer Research, 2013. http://dx.doi.org/10.1158/1538-7445.am2013-1267.
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Langouo, Mireille, Gregory Noël, Gert Van den Eynden, Alexandre De Wind, Soizic Garaud, Pushpamali De Silva, Cinzia Solinas, et al. "Abstract 4689: Immune functions and regulation of follicular helper CD4+CXCR5+T cells in human breast cancer." In Proceedings: AACR Annual Meeting 2018; April 14-18, 2018; Chicago, IL. American Association for Cancer Research, 2018. http://dx.doi.org/10.1158/1538-7445.am2018-4689.
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Blessin, Niclas Christian, Cheng Yang, Maximilian Lennartz, Katharina Möller, Tim Mandelkow, Ronald Simon, Guido Sauter, et al. "Abstract 2735: Clinical significance of CD4+CD7−helper T-cells and tumoral CD7 expression in colorectal cancer." In Proceedings: AACR Annual Meeting 2021; April 10-15, 2021 and May 17-21, 2021; Philadelphia, PA. American Association for Cancer Research, 2021. http://dx.doi.org/10.1158/1538-7445.am2021-2735.
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