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Follicular helper T cells

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https://www.readbyqxmd.com/read/28440484/expression-of-programmed-cell-death1-in-t-follicular-helper-cells-is-regulated-by-prostaglandin-e2-secreted-by-hbv-infected-hepg2-2-1-5-cells
#1
Zhefeng Sui, Ying Shi, Zhiling Gao, Deguang Yang, Zhihao Wang
The present study aimed to investigate the distribution of T follicular helper (Tfh)-cell subsets in patients with hepatitis B virus (HBV) and determine the underlying mechanism of HBV regulation of Tfh cells. The frequency of peripheral blood Tfh subsets was analyzed using flow cytometry. The expression level of programmed cell death‑1 (PD‑1) and prostaglandin E2 (PGE2) was quantified using reverse transcription‑quantitative polymerase chain reaction and western blotting. The PGE2 level in culture supernatant was detected using enzyme‑linked immunosorbent assay...
April 24, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28432129/do-memory-cd4-t-cells-keep-their-cell-type-programming-plasticity-versus-fate-commitment-complexities-of-interpretation-due-to-the-heterogeneity-of-memory-cd4-t-cells-including-t-follicular-helper-cells
#2
Shane Crotty
Plasticity is the ability of a cell type to convert to another cell type. There are multiple effector CD4 T-cell subtypes, including TH1, TH2, TH17, TH1*, CD4 CTL, TH9, and TFH cells. It is commonly thought that a CD4 T cell can readily show full plasticity-full conversion from one differentiated cell-and this propensity to plasticity is possessed by memory CD4 T cells. However, there remains no direct demonstration of in vivo-generated resting memory CD4 T-cell conversion to a different subtype on secondary antigen challenge in vivo in an intact animal at the single-cell level...
April 21, 2017: Cold Spring Harbor Perspectives in Biology
https://www.readbyqxmd.com/read/28431963/expansion-of-circulating-follicular-t-helper-cells-associates-with-disease-severity-in-childhood-atopic-dermatitis
#3
Krisztina Szabó, Krisztián Gáspár, Zsolt Dajnoki, Gábor Papp, Beáta Fábos, Andrea Szegedi, Margit Zeher
Follicular helper T (TFH) cells play crucial role in B-cell differentiation and antibody production. Although, atopic dermatitis (AD) is often associated with increased serum IgE levels, B-cell mediated responses have not been studied thoroughly. The aim of our study was to investigate the proportion of TFH-like cells in the disease. Twelve children and 17 adults with AD as well as 14 healthy controls were enrolled in the study. The frequency of CD4(+)CXCR5(+)ICOS(+)PD-1(+) TFH-like cells and their IL-21 cytokine production were determined by flow cytometry...
April 18, 2017: Immunology Letters
https://www.readbyqxmd.com/read/28429709/t-follicular-helper-and-t-follicular-regulatory-cells-have-different-tcr-specificity
#4
Ana Raquel Maceiras, Silvia Cristina Paiva Almeida, Encarnita Mariotti-Ferrandiz, Wahiba Chaara, Fadi Jebbawi, Adrien Six, Shohei Hori, David Klatzmann, Jose Faro, Luis Graca
Immunization leads to the formation of germinal centres (GCs) that contain both T follicular helper (Tfh) and T follicular regulatory (Tfr) cells. Whether T-cell receptor (TCR) specificity defines the differential functions of Tfh and Tfr cells is unclear. Here we show that antigen-specific T cells after immunization are preferentially recruited to the GC to become Tfh cells, but not Tfr cells. Tfh cells, but not Tfr cells, also proliferate efficiently on restimulation with the same immunizing antigen in vitro...
April 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28428203/tslp-activated-dendritic-cells-induce-human-t-follicular-helper-cell-differentiation-through-ox40-ligand
#5
Lucia Pattarini, Coline Trichot, Sofia Bogiatzi, Maximilien Grandclaudon, Stephan Meller, Zela Keuylian, Melanie Durand, Elisabetta Volpe, Stefania Madonna, Andrea Cavani, Andrea Chiricozzi, Marco Romanelli, Toshiyuki Hori, Alain Hovnanian, Bernhard Homey, Vassili Soumelis
T follicular helper cells (Tfh) are important regulators of humoral responses. Human Tfh polarization pathways have been thus far associated with Th1 and Th17 polarization pathways. How human Tfh cells differentiate in Th2-skewed environments is unknown. We show that thymic stromal lymphopoietin (TSLP)-activated dendritic cells (DCs) promote human Tfh differentiation from naive CD4 T cells. We identified a novel population, distinct from Th2 cells, expressing IL-21 and TNF, suggestive of inflammatory cells...
April 20, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28428120/pathogenesis-of-immune-thrombocytopenia
#6
REVIEW
Sylvain Audia, Matthieu Mahévas, Maxime Samson, Bertrand Godeau, Bernard Bonnotte
Immune thrombocytopenia (ITP) is a rare autoimmune disease due to an abnormal T cell response, notably supported by splenic T follicular helper cells, that stimulates the proliferation and differentiation of autoreactive B cells. The antiplatelet autoantibodies they produce facilitate platelet phagocytosis by macrophages, essentially in the spleen. Macrophages contribute to the perpetuation of the auto-immune response as the main antigen-presenting cell during ITP. CD8(+) T cells also participate to thrombocytopenia by increasing platelet apoptosis...
April 17, 2017: Autoimmunity Reviews
https://www.readbyqxmd.com/read/28424692/t-cells-in-osteoarthritis-alterations-and-beyond
#7
REVIEW
Yu-Sheng Li, Wei Luo, Shou-An Zhu, Guang-Hua Lei
Although osteoarthritis (OA) has been traditionally regarded as a non-inflammatory disease, reports increasingly suggest that it is inflammatory, at least in certain patients. OA patients often exhibit inflammatory infiltration of synovial membranes by macrophages, T cells, mast cells, B cells, plasma cells, natural killer cells, dendritic cells, granulocytes, etc. Although previous reviews have summarized the knowledge of inflammation in the pathogenesis of OA, as far as we know, no report review our current understanding about T cells, especially, each T cell subtype, in the biology of OA...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28424682/interactions-between-type-1-interferons-and-the-th17-response-in-tuberculosis-lessons-learned-from-autoimmune-diseases
#8
REVIEW
Bas C Mourik, Erik Lubberts, Jurriaan E M de Steenwinkel, Tom H M Ottenhoff, Pieter J M Leenen
The classical paradigm of tuberculosis (TB) immunity, with a central protective role for Th1 responses and IFN-γ-stimulated cellular responses, has been challenged by unsatisfactory results of vaccine strategies aimed at enhancing Th1 immunity. Moreover, preclinical TB models have shown that increasing IFN-γ responses in the lungs is more damaging to the host than to the pathogen. Type 1 interferon signaling and altered Th17 responses have also been associated with active TB, but their functional roles in TB pathogenesis remain to be established...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28422784/b-cell-abnormalities-and-impact-on-antibody-response-in-hiv-infection
#9
Alessandra Noto, Giuseppe Pantaleo
PURPOSE OF REVIEW: The purpose of the present review is to provide an update on the current development in the field of broadly neutralizing antibodies (bNabs) and their potential use in the prevention and therapeutic settings, and an evaluation of the B-cell abnormalities that may impair antibody responses in HIV infection. RECENT FINDINGS: Major advances have been achieved in the characterization of bNabs directed against different vulnerable regions of HIV Envelope (Env)...
May 2017: Current Opinion in HIV and AIDS
https://www.readbyqxmd.com/read/28414328/marginal-zone-b-cells-control-the-response-of-follicular-helper-t-cells-to-a-high-cholesterol-diet
#10
Meritxell Nus, Andrew P Sage, Yuning Lu, Leanne Masters, Brian Y H Lam, Stephen Newland, Sandra Weller, Dimitrios Tsiantoulas, Juliette Raffort, Damiënne Marcus, Alison Finigan, Lauren Kitt, Nichola Figg, Reinhold Schirmbeck, Manfred Kneilling, Giles S H Yeo, Christoph J Binder, José Luis de la Pompa, Ziad Mallat
Splenic marginal zone B (MZB) cells, positioned at the interface between circulating blood and lymphoid tissue, detect and respond to blood-borne antigens. Here we show that MZB cells in mice activate a homeostatic program in response to a high-cholesterol diet (HCD) and regulate both the differentiation and accumulation of T follicular helper (TFH) cells. Feeding mice an HCD resulted in upregulated MZB cell surface expression of the immunoregulatory ligand PDL1 in an ATF3-dependent manner and increased the interaction between MZB cells and pre-TFH cells, leading to PDL1-mediated suppression of TFH cell motility, alteration of TFH cell differentiation, reduced TFH abundance and suppression of the proatherogenic TFH response...
April 17, 2017: Nature Medicine
https://www.readbyqxmd.com/read/28408722/ephrin-b1-mediated-repulsion-and-signaling-control-germinal-center-t-cell-territoriality-and-function
#11
Peiwen Lu, Changming Shih, Hai Qi
Follicular T-helper (TFH) cells orchestrate the germinal center (GC) reaction locally. Local mechanisms regulating their dynamics and helper functions are not well defined. Here we found that GC-expressed Ephrin B1 (EFNB1) repulsively inhibited T cell to B cell adhesion and GC TFH retention by signaling through TFH-expressed EPHB6 receptor. At the same time, EFNB1 promoted IL-21 production from GC TFH cells by signaling predominantly through EPHB4. Consequently, EFNB1-null GCs were associated with defective production of plasma cells despite harboring excessive TFH cells...
April 13, 2017: Science
https://www.readbyqxmd.com/read/28407494/vaccine-nanocarriers-coupling-intracellular-pathways-and-cellular-biodistribution-to-control-cd4-vs-cd8-t-cell-responses
#12
Marcela Rincon-Restrepo, Aaron Mayer, Sylvie Hauert, Daniel K Bonner, Edward A Phelps, Jeffrey A Hubbell, Melody A Swartz, Sachiko Hirosue
Nanoparticle delivery systems are known to enhance the immune response to soluble antigens (Ags) and are thus a promising tool for the development of new vaccines. Our laboratory has engineered two different nanoparticulate systems in which Ag is either encapsulated within the core of polymersomes (PSs) or decorated onto the surface of nanoparticles (NPs). Previous studies showed that PSs are better at enhancing CD4 T cells and antibody titers, while NPs preferentially augment cytotoxic CD8 T cells. Herein, we demonstrate that the differential activation of T cell immunity reflects differences in the modes of intracellular trafficking and distinct biodistribution of the Ag in lymphoid organs, which are both driven by the properties of each nanocarrier...
July 2017: Biomaterials
https://www.readbyqxmd.com/read/28393618/regulatory-b-cells-are-functionally-impaired-in-patients-having-hemophilia-a-with-inhibitors
#13
Mohamed-Rachid Boulassel, Maryam Al-Ghonimi, Badriya Al-Balushi, Amal Al-Naamani, Zahra Al-Qarni, Yasser Wali, Mohamed Elshinawy, Maryam Al-Shezawi, Hamad Khan, Hanan Nazir, Doaa Khater, Anil Pathare, Salam Al-Kindi
Development of inhibitors remains a major clinical complication in patients with hemophilia A receiving replacement therapy with factor VIII (FVIII). Understanding the immune mechanisms involved in the development of inhibitors can provide valuable information about pathways to human tolerance. Recent evidence indicates that B regulatory (Breg) cells play a pivotal role in controlling the production of antibodies (Abs) while promoting follicular T helper (Tfh) cells and monocytes, expressing the low-density lipoprotein receptor-related protein (LRP/CD91), which is involved in FVIII intake from the circulation...
January 1, 2017: Clinical and Applied Thrombosis/hemostasis
https://www.readbyqxmd.com/read/28375859/primary-cutaneous-follicular-helper-t-cell-lymphoma-a-case-series-and-review-of-the-literature
#14
James Y Wang, Giang Huong Nguyen, Jia Ruan, Cynthia M Magro
Primary cutaneous follicular helper T-cell (Tfh) lymphoma is a recently described variant of peripheral T-cell lymphoma-not otherwise specified. This particular variant, usually presenting as a sudden onset of multiple plaques and nodules, is characterized by tumoral atypical T cells that express an array of Tfh markers, such as inducible T-cell costimulator, Bcl-6, CXCL13, PD-1, and CD10. The authors now present 3 patients whose known clinical skin findings are consistent with PTCL of Tfh origin (PTCL-Tfh)...
May 2017: American Journal of Dermatopathology
https://www.readbyqxmd.com/read/28373876/il-21-receptor-antagonist-inhibits-differentiation-of-b-cells-toward-plasmablasts-upon-alloantigen-stimulation
#15
Kitty de Leur, Frank J M F Dor, Marjolein Dieterich, Luc J W van der Laan, Rudi W Hendriks, Carla C Baan
Interaction between T follicular helper (Tfh) cells and B cells is complex and involves various pathways, including the production of IL-21 by the Tfh cells. Secretion of IL-21 results in B cell differentiation toward immunoglobulin-producing plasmablasts. In patients after kidney transplantation, the formation of alloantibodies produced by donor antigen-activated B cells are a major cause of organ failure. In this allogeneic response, the role of IL-21-producing Tfh cells that regulate B cell differentiation is unknown...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28371836/differential-effects-of-biological-dmards-on-peripheral-immune-cell-phenotypes-in-patients-with-rheumatoid-arthritis
#16
Shingo Nakayamada, Satoshi Kubo, Maiko Yoshikawa, Yusuke Miyazaki, Naoki Yunoue, Shigeru Iwata, Ippei Miyagawa, Shintaro Hirata, Kazuhisa Nakano, Kazuyoshi Saito, Yoshiya Tanaka
Objective.: The aim of this study was to assess the therapeutic effects of biological DMARDs (bDMARDs) on the diversity of immune cell phenotypes in peripheral blood of patients with RA. Methods.: Peripheral immune cell phenotypes were determined in 108 RA patients who were non-responsive to conventional DMARDs and 33 healthy control subjects by eight-colour flow cytometry. We also examined the correlation between the phenotypes and clinical findings and assessed the effects of 24-week treatment with bDMARDs...
March 27, 2017: Rheumatology
https://www.readbyqxmd.com/read/28363897/differentiation-of-germinal-center-b-cells-into-plasma-cells-is-initiated-by-high-affinity-antigen-and-completed-by-tfh-cells
#17
Nike J Kräutler, Dan Suan, Danyal Butt, Katherine Bourne, Jana R Hermes, Tyani D Chan, Christopher Sundling, Warren Kaplan, Peter Schofield, Jennifer Jackson, Antony Basten, Daniel Christ, Robert Brink
Plasma cells (PCs) derived from germinal centers (GCs) secrete the high-affinity antibodies required for long-term serological immunity. Nevertheless, the process whereby GC B cells differentiate into PCs is uncharacterized, and the mechanism underlying the selective PC differentiation of only high-affinity GC B cells remains unknown. In this study, we show that differentiation into PCs is induced among a discrete subset of high-affinity B cells residing within the light zone of the GC. Initiation of differentiation required signals delivered upon engagement with intact antigen...
March 31, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28360886/increased-circulating-t-follicular-helper-cells-are-inhibited-by-rituximab-in-neuromyelitis-optica-spectrum-disorder
#18
Cong Zhao, Hong-Zeng Li, Dai-Di Zhao, Chao Ma, Fang Wu, Ya-Nan Bai, Min Zhang, Zhu-Yi Li, Jun Guo
Neuromyelitis optica spectrum disorder (NMOSD) is a severe autoimmune disease of the central nervous system. The existence of autoantibody targeting aquaporin-4 (AQP4-Ab) indicates the involvement of humoral immunity in the pathogenesis of this disease. Rituximab (RTX), a monoclonal antibody against CD20, has been used to treat NMOSD by depleting circulating B cells and overall satisfactory outcome has been achieved. Although T follicular helper cells have been proved to regulate B cell activation and antibody production, the role of these cells in NMOSD and the impact of RTX treatment on these cells remain less understood...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28340875/angioimmunoblastic-t-cell-lymphoma
#19
REVIEW
Alessandro Broccoli, Pier Luigi Zinzani
Angioimmunoblastic T-cell lymphoma is a follicular T-helper-derived neoplasm displaying a peculiar morphologic appearance and biological complexity. New mutations have been described that contribute to elucidating the underlying pathogenetic events. The disease behaves aggressively and typically affects elderly patients. The outcomes reported with anthracycline-containing regimens are poor; therefore autologous transplantation in first remission should be offered whenever possible. Newer approaches are urgently needed for relapsed and refractory patients...
April 2017: Hematology/oncology Clinics of North America
https://www.readbyqxmd.com/read/28322863/deep-immune-profiling-by-mass-cytometry-links-human-t-and-nk-cell-differentiation-and-cytotoxic-molecule-expression-patterns
#20
Bertram Bengsch, Takuya Ohtani, Ramin Sedaghat Herati, Niels Bovenschen, Kyong-Mi Chang, E John Wherry
The elimination of infected or tumor cells by direct lysis is a key T and NK cell effector function. T and NK cells can kill target cells by coordinated secretion of cytotoxic granules containing one or both pore-forming proteins, perforin and granulysin and combinations of granzyme (Gzm) family effector proteases (in humans: Gzm A, B, K, M and H). Understanding the pattern of expression of cytotoxic molecules and the relationship to different states of T and NK cells may have direct relevance for immune responses in autoimmunity, infectious disease and cancer...
March 17, 2017: Journal of Immunological Methods
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