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Follicular t helper cell

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https://www.readbyqxmd.com/read/28103236/impact-of-cd4-t-cell-responses-on-clinical-outcome-following-oral-administration-of-wild-type-enterotoxigenic-escherichia-coli-in-humans
#1
Monica A McArthur, Wilbur H Chen, Laurence Magder, Myron M Levine, Marcelo B Sztein
Enterotoxigenic Escherichia coli (ETEC) is a non-invasive enteric pathogen of considerable public health importance, being one of the most common attributable causes of diarrheal illness in infants and young children in developing countries and the most common cause of traveler's diarrhea. To enhance study-to-study consistency of our experimental challenge model of ETEC in volunteers, and to allow concomitant multi-site trials to evaluate anti-ETEC immunoprophylactic products, hundreds of vials, each containing a standardized inoculum of virulent wild-type (wt) ETEC strain H10407 (serotype O78:H11 expressing colonization factor antigen I and heat-labile and heat-stable enterotoxins), were prepared under current Good Manufacturing Practices (cGMP) and frozen...
January 19, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28100620/overexpression-of-il-7-extends-the-humoral-immune-response-induced-by-rabies-vaccination
#2
Yingying Li, Ming Zhou, Zhaochen Luo, Yachun Zhang, Min Cui, Huanchun Chen, Zhen F Fu, Ling Zhao
: Rabies continues to present a public health threat in most countries of the world. The most efficient way to prevent and control rabies is to implement vaccination programmes for domestic animals. However, traditional inactivated vaccines used in animals are costly and have a relatively low efficiency, which impedes their extensive use in developing countries. There is therefore an urgent need to develop single-dose and long-lasting rabies vaccines. However, little information is available regarding the mechanisms underlying immunological memory, which can broaden humoral responses following rabies vaccination...
January 18, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28094754/comparable-therapeutic-potential-of-umbilical-cord-mesenchymal-stem-cells-in-collagen-induced-arthritis-to-tnf-inhibitor-or-anti-cd20-treatment
#3
Yue Sun, Wei Kong, Saisai Huang, Bingyu Shi, Hanyu Zhang, Weiwei Chen, Huayong Zhang, Cheng Zhao, Xiaojun Tang, Genhong Yao, Xuebing Feng, Lingyun Sun
OBJECTIVES: The effects of mesenchymal stem cell (MSC) transplantation on established collagen-induced arthritis (CIA) were evaluated and compared to biologic therapies. METHODS: CIA was induced with the immunisation of type II collagen (CII) in DBA/1 mice. Human umbilical cord MSC, anti-TNF antibody, rhTNFR:Fc fusion protein and anti-CD20 antibody were respectively injected intraperitoneally into CIA mice. Arthritis severity was assessed by clinical and histological scoring...
January 15, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/28092957/germinal-center-dynamics-during-acute-and-chronic-infection
#4
Samantha Erwin, Stanca M Ciupe
The ability of the immune system to clear pathogens is limited during chronic virus infections where potent long-lived plasma and memory B-cells are produced only after germinal center B-cells undergo many rounds of somatic hypermutations. In this paper, we investigate the mechanisms of germinal center B-cell formation by developing mathematical models for the dynamics of B-cell somatic hypermutations. We use the models to determine how B-cell selection and competition for T follicular helper cells and antigen influences the size and composition of germinal centers in acute and chronic infections...
June 1, 2017: Mathematical Biosciences and Engineering: MBE
https://www.readbyqxmd.com/read/28091576/adjuvant-and-carrier-protein-dependent-t-cell-priming-promotes-a-robust-antibody-response-against-the-plasmodium-falciparum-pfs25-vaccine-candidate
#5
Andrea J Radtke, Charles F Anderson, Nicolas Riteau, Kelly Rausch, Puthupparampil Scaria, Emily R Kelnhofer, Randall F Howard, Alan Sher, Ronald N Germain, Patrick Duffy
Humoral immune responses have the potential to maintain protective antibody levels for years due to the immunoglobulin-secreting activity of long-lived plasma cells (LLPCs). However, many subunit vaccines under development fail to generate robust LLPC responses, and therefore a variety of strategies are being employed to overcome this limitation, including conjugation to carrier proteins and/or formulation with potent adjuvants. Pfs25, an antigen expressed on malaria zygotes and ookinetes, is a leading transmission blocking vaccine (TBV) candidate for Plasmodium falciparum...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28089302/germinal-center-lymphocyte-ratios-and-successful-hiv-vaccines
#6
Paula Gonzalez-Figueroa, Jonathan A Roco, Carola G Vinuesa
Current HIV vaccines are poor inducers of neutralizing antibodies (nAbs). A recent study in Cell Reports used serial fine-needle aspirates from rhesus macaque lymph nodes following HIV-1 surface envelope glycoprotein (Env) trimer immunization, generating a substantial production of HIV-1 nAbs. A remarkable correlation was found between antibody titers and a high frequency and ratio of germinal center B and T follicular helper (TFH) lymphocytes.
January 11, 2017: Trends in Molecular Medicine
https://www.readbyqxmd.com/read/28077867/microbiome-in-2016-t-follicular-helper-cells-and-the-gut-microbiome-in-arthritis
#7
Veena Taneja
No abstract text is available yet for this article.
January 12, 2017: Nature Reviews. Rheumatology
https://www.readbyqxmd.com/read/28058210/biology-of-chronic-graft-vs-host-disease-immune-mechanisms-and-progress-in-biomarker-discovery
#8
REVIEW
Richard B Presland
Chronic graft-vs-host disease (cGVHD) is the leading cause of long-term morbidity and mortality following allogeneic hematopoietic stem cell transplantation. It presents as a chronic inflammatory and sclerotic autoimmune-like condition that most frequently affects the skin, oral mucosa, liver, eyes and gastrointestinal tract. Both clinical and animal studies have shown that multiple T cell subsets including Th1, Th2, Th17, T follicular helper cells and regulatory T-cells play some role in cGVHD development and progression; B cells also play an important role in the disease including the production of antibodies to HY and nuclear antigens that can cause serious tissue damage...
December 24, 2016: World Journal of Transplantation
https://www.readbyqxmd.com/read/28057386/nanoparticles-decorated-with-viral-antigens-are-more-immunogenic-at-low-surface-density
#9
Matthew G Brewer, Anthony DiPiazza, Joshua Acklin, Changyong Feng, Andrea J Sant, Stephen Dewhurst
There is an urgent need to develop protective vaccines for high priority viral pathogens. One approach known to enhance immune responses to viral proteins is to display them on a nanoparticle (NP) scaffold. However, little is known about the effect of protein density on the B cell response to antigens displayed on NPs. To address this question HIV-1 Envelope (Env) and influenza hemagglutinin (HA) were displayed on a polystyrene-based NP scaffold at various densities - corresponding to mean antigen distances that span the range encountered on naturally occurring virions...
January 3, 2017: Vaccine
https://www.readbyqxmd.com/read/28049627/dissection-of-sap-dependent-and-sap-independent-slam-family-signaling-in-nkt-cell-development-and-humoral-immunity
#10
Shasha Chen, Chenxu Cai, Zehua Li, Guangao Liu, Yuande Wang, Marzenna Blonska, Dan Li, Juan Du, Xin Lin, Meixiang Yang, Zhongjun Dong
Signaling lymphocytic activation molecule (SLAM)-associated protein (SAP) mutations in X-linked lymphoproliferative disease (XLP) lead to defective NKT cell development and impaired humoral immunity. Because of the redundancy of SLAM family receptors (SFRs) and the complexity of SAP actions, how SFRs and SAP mediate these processes remains elusive. Here, we examined NKT cell development and humoral immunity in mice completely deficient in SFR. We found that SFR deficiency severely impaired NKT cell development...
January 3, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28045014/death-receptor-6-contributes-to-autoimmunity-in-lupus-prone-mice
#11
Daisuke Fujikura, Masahiro Ikesue, Tsutomu Endo, Satoko Chiba, Hideaki Higashi, Toshimitsu Uede
Expansion of autoreactive follicular helper T (Tfh) cells is tightly restricted to prevent induction of autoantibody-dependent immunological diseases, such as systemic lupus erythematosus (SLE). Here we show expression of an orphan immune regulator, death receptor 6 (DR6/TNFRSF21), on a population of Tfh cells that are highly expanded in lupus-like disease progression in mice. Genome-wide screening reveals an interaction between syndecan-1 and DR6 resulting in immunosuppressive functions. Importantly, syndecan-1 is expressed specifically on autoreactive germinal centre (GC) B cells that are critical for maintenance of Tfh cells...
January 3, 2017: Nature Communications
https://www.readbyqxmd.com/read/28040417/i%C3%AE%C2%BAbns-enhances-t-follicular-helper-cell-differentiation-and-function-as-downstream-of-ascl2
#12
Junichi Hosokawa, Kotaro Suzuki, Kazuyuki Meguro, Shigeru Tanaka, Yuko Maezawa, Akira Suto, Lisa Fujimura, Akemi Sakamoto, Hans Clevers, Osamu Ohara, Hiroshi Nakajima
IκBNS plays an important role in Tfh cell differentiation and function.
December 28, 2016: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28018990/the-tcf1-bcl6-axis-counteracts-type-i-interferon-to-repress-exhaustion-and-maintain-t-cell-stemness
#13
Tuoqi Wu, Yun Ji, E Ashley Moseman, Haifeng C Xu, Monica Manglani, Martha Kirby, Stacie M Anderson, Robin Handon, Elizabeth Kenyon, Abdel Elkahloun, Weiwei Wu, Philipp A Lang, Luca Gattinoni, Dorian B McGavern, Pamela L Schwartzberg
During chronic viral infections and in cancer, T cells become dysfunctional, a state known as T cell exhaustion. Although it is well recognized that memory CD8 T cells account for the persistence of CD8 T cell immunity after acute infection, how exhausted T cells persist remains less clear. Using chronic infection with lymphocytic choriomeningitis virus clone 13 and tumor samples, we demonstrate that CD8 T cells differentiate into a less exhausted TCF1(high) and a more exhausted TCF1(low) population. Virus-specific TCF1(high) CD8 T cells, which resemble T follicular helper (TFH) cells, persist and recall better than do TCF1(low) cells and act as progenitor cells to replenish TCF1(low) cells...
December 23, 2016: Science Immunology
https://www.readbyqxmd.com/read/28017425/vaccination-of-rhesus-macaques-with-the-live-attenuated-hsv-1-vaccine-vc2-stimulates-the-proliferation-of-mucosal-t-cells-and-germinal-center-responses-resulting-in-sustained-production-of-highly-neutralizing-antibodies
#14
Brent A Stanfield, Bapi Pahar, Vladimir N Chouljenko, Ronald Veazey, Konstantin G Kousoulas
We have shown that the live-attenuated HSV-1 VC2 vaccine strain with mutations in glycoprotein K (gK) and the membrane protein UL20 is unable to establish latency in vaccinated animals and produces a robust immune response capable of completely protecting mice against lethal vaginal HSV-1 or HSV-2 infections. To better understand the immune response generated by vaccination with VC2, we tested its ability to elicit immune responses in rhesus macaques. Vaccinated animals showed no signs of disease and developed increasing HSV-1 and HSV-2 reactive IgG1 after two booster vaccinations, while IgG subtypes IgG2 and IgG3 remained at low to undetectable levels...
December 22, 2016: Vaccine
https://www.readbyqxmd.com/read/28003483/adenovirus-serotype-5-vaccination-results-in-suboptimal-cd4-t-helper-1-responses-in-mice
#15
Junghwa Lee, Masao Hashimoto, Se Jin Im, Koichi Araki, Hyun-Tak Jin, Carl W Davis, Bogumila T Konieczny, Gregory A Spies, M Juliana McElrath, Rafi Ahmed
: Adenovirus serotype 5 (Ad5) is one of the most widely used viral vectors and is known to generate potent T cell responses. While many previous studies have characterized Ad5-induced CD8 T cell responses, there is a relative lack of detailed studies analysing CD4 T cells elicited by Ad5 vaccination. Herein, we immunized mice with Ad5 vectors encoding lymphocytic choriomeningitis virus (LCMV)-glycoprotein (GP) and examined GP-specific CD4 T cell responses elicited by Ad5 vectors compared to those induced by an acute LCMV infection...
December 21, 2016: Journal of Virology
https://www.readbyqxmd.com/read/28003262/defining-the-clonality-of-peripheral-t-cell-lymphomas-using-rna-seq
#16
Scott D Brown, Greg Hapgood, Christian Steidl, Andrew P Weng, Kerry J Savage, Robert A Holt
MOTIVATION: In T-cell lymphoma, malignant T cells arising from a founding clone share an identical T cell receptor (TCR) and can be identified by the over-representation of this TCR relative to TCRs from the patient's repertoire of normal T cells. Here, we demonstrate that TCR information extracted from RNA-seq data can provide a higher resolution view of peripheral T cell lymphomas (PTCLs) than that provided by conventional methods. RESULTS: For 60 subjects with PTCL, flow cytometry/FACS was used to identify and sort aberrant T cell populations from diagnostic lymph node cell suspensions...
December 21, 2016: Bioinformatics
https://www.readbyqxmd.com/read/27999289/characterization-of-the-microenvironment-of-nodular-lymphocyte-predominant-hodgkin-lymphoma
#17
Lydia Visser, Rui Wu, Bea Rutgers, Arjan Diepstra, Anke van den Berg
Nodular lymphocyte predominant Hodgkin lymphoma (NLPHL) is characterized by a low percentage of neoplastic lymphocyte predominant (LP) cells in a background of lymphocytes. The goal of this study is to characterize the microenvironment in NLPHL. Ten NLPHL cases and seven reactive lymph nodes (RLN) were analyzed by flow cytometry for the main immune cells and multiple specific subpopulations. To discriminate between cells in or outside the tumor cell area, we used CD26. We observed significantly lower levels of CD20+ B-cells and CD56+ NK cells and higher levels of CD4+ T-cells in NLPHL in comparison to RLN...
December 16, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27997758/comprehensive-mass-cytometry-analysis-of-cell-cycle-activation-and-co-inhibitory-receptors-expression-in-cd4-t-cells-from-healthy-and-hiv-infected-individuals
#18
REVIEW
Aurélien Corneau, Antonio Cosma, Sophie Even, Christine Katlama, Roger Legrand, Véronique Frachet, Catherine Blanc, Brigitte Autran
RATIONALE: Mass cytometry allows large multiplex analysis of cell cycle stages together with differentiation, activation and exhaustion markers, allowing further assessment of the quiescence status of resting CD4 T cells. METHODS: peripheral blood CD4 T lymphocytes from 8 individuals, 4 healthy donors (HD) and 4 HIV-infected on anti-retroviral treatment (T) were stained with the same 26 monoclonal antibodies and dyes targeting surface and intra-cellular markers of differentiation, activation, exhaustion and cell cycle stages...
December 20, 2016: Cytometry. Part B, Clinical Cytometry
https://www.readbyqxmd.com/read/27997339/toll-like-receptor-3-adjuvant-in-combination-with-virus-like-particles-elicit-a-humoral-response-against-hiv
#19
Ethan Poteet, Phoebe Lewis, Changyi Chen, Sam On Ho, Thai Do, SuMing Chiang, Celia Labranche, David Montefiori, Gary Fujii, Qizhi Yao
Human Immunodeficiency Virus (HIV) Virus-Like Particles (VLPs) composed of HIVIIIB Gag and HIVBaL gp120/gp41 envelope are a pseudovirion vaccine capable of presenting antigens in their native conformations. To enhance the immunogenicity of the HIV Env antigen, VLPs were coupled to VesiVax Conjugatable Adjuvant Lipid Vesicles (CALV) containing one of four toll-like-receptor (TLR) ligands, each activating a receptor with distinct cellular localization and downstream pathways. C57BL/6 mice were vaccinated by intranasal prime followed by two sub-cheek boosts and their sera immunoglobulin and neutralizing potency were measured over a duration of 3months after vaccination...
November 21, 2016: Vaccine
https://www.readbyqxmd.com/read/27994594/type-i-interferon-impairs-specific-antibody-responses-early-during-establishment-of-lcmv-infection
#20
Matthieu Daugan, Armstrong Murira, Barbara C Mindt, Amélie Germain, Esther Tarrab, Pascal Lapierre, Jörg H Fritz, Alain Lamarre
Elicitation of type I interferon (IFN-I) has been shown to both enhance and impair cell-mediated immune responses in acute and persistent viral infections, respectively. Here, we show that, in addition to its effect on T cells, IFN-I drives impairment of specific antibody responses through interaction with B cells in the acute phase of lymphocytic choriomeningitis virus (LCMV) infection. This impairment was limited to the T cell-dependent B cell response and was associated with disruption of B cell follicles, development of hypergammaglobulinemia (HGG), and expansion of the T follicular helper cell population...
2016: Frontiers in Immunology
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