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Costimulatory t cells

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https://www.readbyqxmd.com/read/28321220/adjusted-particle-size-eliminates-the-need-of-linkage-of-antigen-and-adjuvants-for-appropriated-t-cell-responses-in-virus-like-particle-based-vaccines
#1
Ariane C Gomes, Anna Flace, Philippe Saudan, Franziska Zabel, Gustavo Cabral-Miranda, Aadil El Turabi, Vania Manolova, Martin F Bachmann
Since the discovery of the first virus-like particle (VLP) derived from hepatitis B virus in 1980 (1), the field has expanded substantially. Besides successful use of VLPs as safe autologous virus-targeting vaccines, the powerful immunogenicity of VLPs has been also harnessed to generate immune response against heterologous and even self-antigens (2-4). Linking adjuvants to VLPs displaying heterologous antigen ensures simultaneous delivery of all vaccine components to the same antigen-presenting cells. As a consequence, antigen-presenting cells, such as dendritic cells, will process and present the antigen displayed on VLPs while receiving costimulatory signals by the VLP-incorporated adjuvant...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28320831/interference-of-the-t-cell-and-antigen-presenting-cell-costimulatory-pathway-using-ctla4-ig-abatacept-prevents-staphylococcal-enterotoxin-b-pathology
#2
Sarah J C Whitfield, Chris Taylor, Jane E Risdall, Gareth D Griffiths, James T A Jones, E Diane Williamson, Sjoerd Rijpkema, Luisa Saraiva, Sandrine Vessillier, A Christopher Green, Alun J Carter
Staphylococcal enterotoxin B (SEB) is a bacterial superantigen that binds the receptors in the APC/T cell synapse and causes increased proliferation of T cells and a cytokine storm syndrome in vivo. Exposure to the toxin can be lethal and cause significant pathology in humans. The lack of effective therapies for SEB exposure remains an area of concern, particularly in scenarios of acute mass casualties. We hypothesized that blockade of the T cell costimulatory signal by the CTLA4-Ig synthetic protein (abatacept) could prevent SEB-dependent pathology...
March 20, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28320444/ox40-signaling-is-involved-in-the-autoactivation-of-cd4-cd28-t-cells-and-contributes-to-the-pathogenesis-of-autoimmune-arthritis
#3
Juean Jiang, Cuiping Liu, Mi Liu, Yu Shen, Xiaohan Hu, Qin Wang, Jian Wu, Min Wu, Qi Fang, Xueguang Zhang
BACKGROUND: CD4(+)CD28(-) T cells exhibit autoreactive potential in autoimmune disorders, including rheumatoid arthritis (RA). It is not well known which costimulator functions as an alternative second signal in the activation of this subset after CD28 expression is downregulated. Tumor necrosis factor receptor superfamily member OX40 is a key costimulator in the activation of T cells. The aim of this study was to investigate the costimulatory effects of OX40 on CD4(+)CD28(-) T cells in autoimmune arthritis...
March 21, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28296542/the-autophagy-machinery-restrains-inkt-cell-activation-through-cd1d1-internalization
#4
Christian W Keller, Monica Loi, Svenja Ewert, Isaak Quast, Romina Theiler, Monique Gannagé, Christian Münz, Gennaro De Libero, Stefan Freigang, Jan D Lünemann
Invariant natural killer T (iNKT) cells are innate T cells with powerful immune regulatory functions that recognize glycolipid antigens presented by the CD1D protein. While iNKT-cell-activating glycolipids are currently being explored for their efficacy to improve immunotherapy against infectious diseases and cancer, little is known about the mechanisms that control CD1D antigen presentation and iNKT cell activation in vivo. CD1D molecules survey endocytic pathways to bind lipid antigens in MHC class II containing compartments (MIICs) before recycling to the plasma membrane...
March 15, 2017: Autophagy
https://www.readbyqxmd.com/read/28293664/the-expression-of-b7-h3-molecule-in-periodontal-disease
#5
Saumya John, Arun Kurumathur, Avaneendra Talwar, Keerthana Kumar, Teenu Abraham, Ananthi Alagiri, Gnanasagar Walaja, Jasmine Clements
STATEMENT OF THE PROBLEM: T cells have been shown to play a role in the etiopathogenesis of periodontal disease. B7-H3, a costimulatory molecule, is found to be associated with regulation of T cell function in some tumoral tissues, as well as autoimmune and inflammatory diseases. PURPOSE: The aim of this study was to investigate the expression of B7-H3 molecule in healthy and diseased gingival tissue samples. MATERIALS AND METHOD: Gingival samples were taken from 2 groups (A and B) representing periodontal health and periodontal disease, respectively...
March 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28293065/the-combination-of-mbp-and-bcg-induced-dendritic-cell-maturation-through-tlr2-tlr4-promotes-th1-activation-in-vitro-and-vivo
#6
LiNa Jiang, GuoMu Liu, WeiHua Ni, NanNan Zhang, Jing Jie, Fei Xie, GuiXiang Tai
To explore whether TLR2/TLR4 could be involved in the maturation of dendritic cells and polarization of CD4(+) T cells induced by dendritic cells stimulated with MBP and BCG, in vitro and in vivo experiments using TLR2(-/-) or TLR4(-/-) mice were employed. MBP and BCG elevated CD80, CD86 and MHC class II expressed on dendritic cells and increased IL-12 protein, induced DC maturation, and indirectly promoted Th1 activation. Moreover, MBP and BCG upregulated costimulatory molecules on DCs in a TLR2- and TLR4-dependent manner...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28289708/interruption-of-ox40l-signaling-prevents-costimulation-blockade-resistant-allograft-rejection
#7
William H Kitchens, Ying Dong, David V Mathews, Cynthia P Breeden, Elizabeth Strobert, Maria E Fuentes, Christian P Larsen, Mandy L Ford, Andrew B Adams
The potential of costimulation blockade to serve as a novel transplant immunosuppression strategy has been explored for over 20 years, culminating in the recent clinical approval of belatacept for renal transplant patients. Despite improving long-term graft function and survival compared with calcineurin inhibitors, clinical acceptance of belatacept has been hindered by elevated rates of acute rejection. We examined the signaling pathways required to activate costimulation blockade-resistant alloreactive T cells and identified the OX40/OX40L secondary costimulatory pathway as a promising target...
March 9, 2017: JCI Insight
https://www.readbyqxmd.com/read/28287110/t-cells-and-autoimmune-kidney-disease
#8
REVIEW
Abel Suárez-Fueyo, Sean J Bradley, David Klatzmann, George C Tsokos
Glomerulonephritis is traditionally considered to result from the invasion of the kidney by autoantibodies and immune complexes from the circulation or following their formation in situ, and by cells of the innate and the adaptive immune system. The inflammatory response leads to the proliferation and dysfunction of cells of the glomerulus, and invasion of the interstitial space with immune cells, resulting in tubular cell malfunction and fibrosis. T cells are critical drivers of autoimmunity and related organ damage, by supporting B-cell differentiation and antibody production or by directly promoting inflammation and cytotoxicity against kidney resident cells...
March 13, 2017: Nature Reviews. Nephrology
https://www.readbyqxmd.com/read/28286804/bacterial-superantigen-toxins-induce-a-lethal-cytokine-storm-by-enhancing-b7-2-cd28-costimulatory-receptor-engagement-a-critical-immune-checkpoint
#9
Raymond Kaempfer, Andrey Popugailo, Revital Levy, Gila Arad, Dalia Hillman, Ziv Rotfogel
Formation of the costimulatory axis between the B7-2 and CD28 coreceptors is critical for T-cell activation. Superantigens, Gram-positive bacterial virulence factors, cause toxic shock and sepsis by hyperinducing inflammatory cytokines. We report a novel role for costimulatory receptors CD28 and B7-2 as obligatory receptors for superantigens, rendering them therapeutic targets. We show that by engaging not only CD28 but also its coligand B7-2 directly, superantigens potently enhance the interaction between B7-2 and CD28, inducing thereby T-cell hyperactivation...
2017: Receptors & Clinical Investigation
https://www.readbyqxmd.com/read/28283679/the-immunological-function-of-cd52-and-its-targeting-in-organ-transplantation
#10
REVIEW
Yang Zhao, Huiting Su, Xiaofei Shen, Junfeng Du, Xiaodong Zhang, Yong Zhao
INTRODUCTION: CD52 (Campath-1 antigen), a glycoprotein of 12 amino acids anchored to glycosylphosphatidylinositol, is widely expressed on the cell surface of immune cells, such as mature lymphocytes, natural killer cells (NK), eosinophils, neutrophils, monocytes/macrophages, and dendritic cells (DCs). The anti-CD52 mAb, alemtuzumab, was used widely in clinics for the treatment of patients such as organ transplantation. In the present manuscript, we will briefly summarize the immunological function of CD52 and discuss the application of anti-CD52 mAb in transplantation settings...
March 10, 2017: Inflammation Research: Official Journal of the European Histamine Research Society ... [et Al.]
https://www.readbyqxmd.com/read/28275769/immunomodulatory-effect-of-protease-hydrolysates-from-ovotransferrin
#11
Lin Liu, Mingsheng Xu, Yonggang Tu, Huaying Du, Yulan Zhou, Gaoxiang Zhu
Proteins and bioactive peptides in avian egg white exert diverse biological activities. This study is designed to investigate the effect of protease hydrolysates from ovotransferrin (OVT) on bone marrow-derived dendritic cells (BMDCs) maturation. The results show that OVT-derived pepsin hydrolysate effectively inhibits lipopolysaccharide (LPS)-induced BMDCs maturation by reducing the expression levels of MHC-II, CD83, CD86 and the production of TNF-α, IL-12p70, and RANTES, but increases the production of IL-10...
March 9, 2017: Food & Function
https://www.readbyqxmd.com/read/28275140/antibody-independent-function-of-human-b-cells-contributes-to-antifungal-t-cell-responses
#12
Rui Li, Ayman Rezk, Hulun Li, Jennifer L Gommerman, Alexandre Prat, Amit Bar-Or
Fungal infections (e.g., Candida albicans) can manifest as serious medical illnesses, especially in the elderly and immune-compromised hosts. T cells are important for Candida control. Whether and how B cells are involved in antifungal immunity has been less clear. Although patients with agammaglobulinemia exhibit normal antifungal immunity, increased fungal infections are reported following B cell-depleting therapy, together pointing to Ab-independent roles of B cells in controlling such infections. To test how human B cells may contribute to fungal-associated human T cell responses, we developed a novel Ag-specific human T cell/B cell in vitro coculture system and found that human B cells could induce C...
March 8, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28271056/increasing-jak-stat-signaling-function-of-infant-cd4-t-cells-during-the-first-year-of-life
#13
Myra Grace Dela Peña-Ponce, Jennifer Rodriguez-Nieves, Janice Bernhardt, Ryan Tuck, Neelima Choudhary, Michael Mengual, Katie R Mollan, Michael G Hudgens, Sigal Peter-Wohl, Kristina De Paris
Most infant deaths occur in the first year of life. Yet, our knowledge of immune development during this period is scarce and derived from cord blood (CB) only. To more effectively combat pediatric diseases, a deeper understanding of the kinetics and the factors that regulate the maturation of immune functions in early life is needed. Increased disease susceptibility of infants is generally attributed to T helper 2-biased immune responses. The differentiation of CD4(+) T cells along a specific T helper cell lineage is dependent on the pathogen type, and on costimulatory and cytokine signals provided by antigen-presenting cells...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/28270814/the-novel-toll-like-receptor-2-agonist-sup3-enhances-antigen-presentation-and-t-cell-activation-by-dendritic-cells
#14
Xueheng Guo, Ning Wu, Yingli Shang, Xin Liu, Tao Wu, Yifan Zhou, Xin Liu, Jiaoyan Huang, Xuebin Liao, Li Wu
Dendritic cells (DCs) are highly specialized antigen-presenting cells that play crucial roles in innate and adaptive immunity. Previous studies suggested that Toll-like receptor (TLR) agonists could be used as potential adjuvants, as activation of TLRs can boost DC-induced immune responses. TLR2 agonists have been shown to enhance DC-mediated immune responses. However, classical TLR2 agonists such as Pam3CSK4 are not stable enough in vivo, which limits their clinical applications. In this study, a novel structurally stable TLR2 agonist named SUP3 was designed...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28261278/elevated-expression-of-tigit-on-cd3-cd4-t-cells-correlates-with-disease-activity-in-systemic-lupus-erythematosus
#15
Qing Luo, Jianqing Ye, Lulu Zeng, Xue Li, Le Fang, Beihua Ju, Zikun Huang, Junming Li
OBJECTIVES: It is well-known that lymphocytes play an important role in systemic lupus erythematosus (SLE). T cell immunoreceptor with Ig and immunoreceptor tyrosine-based inhibitory domains (TIGIT) is one of immunosuppressive costimulatory molecules that mediates an inhibitory effect. However, its roles in SLE are poorly understood. This study was designed to investigate the correlation between the frequencies of TIGIT-expressing CD3(+)CD4(+) T lymphocytes and SLE. METHODS: Patients with SLE were recruited from the First Affiliated Hospital of Nanchang University...
2017: Allergy, Asthma, and Clinical Immunology
https://www.readbyqxmd.com/read/28260295/-experimental-study-on-the-immune-response-of-fusion-tumor-vaccine-of-hepg2-and-dendritic-cells-in-vitro
#16
Y B Pang, B Y Cui, J He, X P Huang, W Liang, L Q Li, X L Luo
Objective: To estimate the immune response of HepG2/dendritic cell (DC) fusion cells vaccines against HepG2 cells in vitro. Methods: Peripheral blood mononuclear cells (PBMCs) were isolated from healthy donors by Ficoll-Hypaque density-gradient centrifugation.Then DC were obtain from PBMCs by culturing in medium containing granulocyte macrophage colony-stimulating factor (GM-CSF) and interleukin-4 (IL-4) for 5 days.DC and HepG2 fusion cells were induced by polythyleneglycol (PEG). The fusion cells were examined under fluorescence microscope by labeling DCs and HepG2 with green and red fluorescein, respectively, and then the fusion rates were analyzed by flow cytometry...
February 21, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28255705/f%C3%A3-rster-resonance-energy-transfer-to-study-tcr-pmhc-interactions-in-the-immunological-synapse
#17
Gerhard J Schütz, Johannes B Huppa
T-cell antigen recognition is remarkably efficient: when scanning the surface of antigen-presenting cells (APCs), T-cells can detect the presence of just a few single antigenic peptide/MHCs (pMHCs), which are often vastly outnumbered by structurally similar non-stimulatory endogenous pMHCs (Irvine et al., Nature 419(6909):845-849, 2002; Purbhoo et al., Nat Immunol 5(5):524-530, 2004; Huang et al., Immunity 39(5):846-857, 2013). How T-cells achieve this is still enigmatic, in particular in view of the rather moderate affinity that TCRs typically exert for antigenic pMHCs, at least when measured in vitro (Davis et al...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28248972/novel-cd28-antagonist-mpeg-pv1-fab-mitigates-experimental-autoimmune-uveitis-by-suppressing-cd4-t-lymphocyte-activation-and-ifn-%C3%AE-production
#18
Pedro Henrique Papotto, Eliana Blini Marengo, Luiz Roberto Sardinha, Karina Inácio Carvalho, Ana Eduarda Zulim de Carvalho, Sheyla Castillo-Mendez, Carina Calixto Jank, Bernard Vanhove, Anna Carla Goldberg, Luiz Vicente Rizzo
Autoimmune Uveitis is an important chronic inflammatory disease and a leading cause of impaired vision and blindness. This ocular autoimmune disorder is mainly mediated by T CD4+ lymphocytes poising a TH1 phenotype. Costimulatory molecules are known to play an important role on T cell activation and therefore represent interesting therapeutical targets for autoimmune disorders. CD28 is the prototypical costimulatory molecule for T lymphocytes, and plays a crucial role in the initiation, and maintenance of immune responses...
2017: PloS One
https://www.readbyqxmd.com/read/28228759/interleukin-35-producing-cd8%C3%AE-dendritic-cells-acquire-a-tolerogenic-state-and-regulate-t-cell-function
#19
Sergio Haller, Anaïs Duval, Romain Migliorini, Mathias Stevanin, Vanessa Mack, Hans Acha-Orbea
Dendritic cells (DCs) play a central role in shaping immunogenic as well as tolerogenic adaptive immune responses and thereby dictate the outcome of adaptive immunity. Here, we report the generation of a CD8α(+) DC line constitutively secreting the tolerogenic cytokine interleukin (IL)-35. IL-35 secretion led to impaired CD4(+) and CD8(+) T lymphocyte proliferation and interfered with their function in vitro and also in vivo. IL-35 was furthermore found to induce a tolerogenic phenotype on CD8α(+) DCs, characterized by the upregulation of CD11b, downregulation of MHC class II, a reduced costimulatory potential as well as production of the immunomodulatory molecule IL-10...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28222841/phenotypic-and-functional-characterization-of-peripheral-blood-lymphocytes-from-various-age-and-sex-specific-groups-of-owl-monkeys-aotus-nancymaae
#20
Pramod N Nehete, Bharti P Nehete, Sriram Chitta, Lawrence E Williams, Christian R Abee
Owl monkeys (Aotus nancymaae) are New World NHP that serve an important role in vaccine development and as a model for human disease conditions such as malaria. Despite the past contributions of this animal model, limited information is available about the phenotype and functional properties of peripheral blood lymphocytes in reference to sex and age. Using a panel of human antibodies and a set of standardized human immune assays, we identified and characterized various peripheral blood lymphocyte subsets, evaluated the immune functions of T cells, and analyzed cytokines relative to sex and age in healthy owl monkeys...
February 1, 2017: Comparative Medicine
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