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Follicular helper T cells

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https://www.readbyqxmd.com/read/28533444/t-follicular-helper-cell-derived-il-4-is-required-for-ige-production-during-intestinal-helminth-infection
#1
Alexandre P Meli, Ghislaine Fontés, Cindy Leung Soo, Irah L King
IgE production plays a crucial role in protective as well as pathogenic type 2 immune responses. Although the cytokine IL-4 is required for the development of IgE-producing plasma cells, the source of IL-4 and cellular requirements for optimal IgE responses remain unclear. Recent evidence suggests that T follicular helper (Tfh) cells are the primary producer of IL-4 in the reactive lymph node during type 2 immune responses. As Tfh cells are also required for the development of plasmablasts derived from germinal center and extrafollicular sources, we hypothesized that this cell subset is essential for the IgE plasmablast response...
May 22, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28533093/safety-and-immunogenicity-of-a-live-attenuated-influenza-h5-candidate-vaccine-strain-a-17-turkey-turkey-05-133-h5n2-and-its-priming-effects-for-potential-pre-pandemic-use-a-randomised-double-blind-placebo-controlled-trial
#2
Punnee Pitisuttithum, Kobporn Boonnak, Supat Chamnanchanunt, Pilaipan Puthavathana, Viravarn Luvira, Hatairat Lerdsamran, Jaranit Kaewkungwal, Saranath Lawpoolsri, Vipa Thanachartwet, Udomsak Silachamroon, Wanibtisam Masamae, Alexandra Schuetz, Ponthip Wirachwong, Sit Thirapakpoomanunt, Larisa Rudenko, Erin Sparrow, Martin Friede, Marie-Paule Kieny
BACKGROUND: The emergence of highly pathogenic avian influenza H5N1 viruses has raised concerns about their pandemic potential. Vaccination is the most effective way of preventing influenza. In this study, we investigated the safety and immunogenicity of an avian H5N2 live attenuated influenza vaccine (LAIV H5N2) in healthy Thai adults and its priming immune responses with an H5N1 inactivated vaccine boost. METHODS: This study was done at the Vaccine Trial Centre at Mahidol University, Bangkok, Thailand and was divided into two parts...
May 19, 2017: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/28527887/mst1-deficiency-promotes-b-cell-responses-by-cd4-t-cell-derived-il-4-resulting-in-hypergammaglobulinemia
#3
Eunchong Park, Myun Soo Kim, Ju Han Song, Kyung Min Cho, Kyung-Hye Roh, Rana Lee, Tae Sung Kim
MST1 deficiency causes T and B cell lymphopenia, resulting in combined immunodeficiency. However, MST1-deficient patients also exhibit autoimmune-like symptoms such as hypergammaglobulinemia and autoantibody production. Recent studies have shown that the autoimmune responses observed in MST1-deficient patients were most likely attributable to defective regulatory T (Treg) cells instead of intrinsic signals in MST1-lacking B cells. Nevertheless, it is not determined how MST1 deficiency in T cells breaks B cell tolerance and causes systemic autoimmune-like phenotypes...
May 17, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28516880/abatacept-therapy-reduces-cd28-cxcr5-follicular-helper-like-t-cells-in-patients-with-rheumatoid-arthritis
#4
Shunsuke Fukuyo, Shingo Nakayamada, Shigeru Iwata, Satoshi Kubo, Kazuyoshi Saito, Yoshiya Tanaka
OBJECTIVES: The characteristics of T cells targeted by abatacept (ABT) in cases of rheumatoid arthritis (RA) are still unknown. The goal of the study was to determine the pathogenicity of T cells and the predictors of therapeutic effects of ABT. METHODS: We analysed the peripheral T cell phenotype of 34 RA patients via flow cytometry. The correlation of the phenotypes of CD4+ T cells with clinical disease activity and change in CD4+ T cell subsets at baseline and 24 weeks after ABT treatment were evaluated...
April 27, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/28513867/the-role-of-circulating-t-follicular-helper-cells-and-regulatory-cells-in-non-small-cell-lung-cancer-patients
#5
Zhenxing Guo, Hailong Liang, Yaru Xu, Li Liu, Xiuhong Ren, Songsong Zhang, Shenhai Wei, Peng Xu
T follicular helper (Tfh) cells and T follicular regulatory (Tfr) cells are identified as the new subset of immune cells. This study aims to investigate the role of circulating Tfh cells (cTfh) and Tfr (cTfr) cells in the pathogenesis of non-small cell lung cancer (NSCLC). A total of 27 NSCLC patients and 19 age and sex matched healthy controls were enrolled. The percentage of cTfh and cTfr was detected by flow cytometric analysis. Compared to healthy controls, a significantly higher percentage of both cTfh and cTfr cells were observed in NSCLC patients (for cTfh, 18...
May 17, 2017: Scandinavian Journal of Immunology
https://www.readbyqxmd.com/read/28511719/interleukin-10-producing-lag3-regulatory-t-cells-are-associated-with-disease-activity-and-abatacept-treatment-in-rheumatoid-arthritis
#6
Shinichiro Nakachi, Shuji Sumitomo, Yumi Tsuchida, Haruka Tsuchiya, Masanori Kono, Rika Kato, Keiichi Sakurai, Norio Hanata, Yasuo Nagafuchi, Shoko Tateishi, Hiroko Kanda, Tomohisa Okamura, Kazuhiko Yamamoto, Keishi Fujio
BACKGROUND: Regulatory T cells (Tregs) play a role in the suppression of inflammation in autoimmune diseases, and lymphocyte activation gene 3 (LAG3) was reported as a marker of interleukin (IL)-10-producing Tregs. We aimed to clarify the function of human IL-10-producing CD4(+)CD25(-)LAG3(+) T cells (LAG3(+) Tregs) and their association with rheumatoid arthritis (RA). METHODS: LAG3(+) Tregs of human peripheral blood mononuclear cells (PBMCs) were cultured with B cells and follicular helper T cells to examine antibody suppression effects...
May 16, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28506846/allergen-specific-immunotherapy-modulates-the-balance-of-circulating-tfh-and-tfr-cells
#7
Veronique Schulten, Victoria Tripple, Grégory Seumois, Yu Qian, Richard H Scheuermann, Zheng Fu, Michela Locci, Sandy Rosales, Pandurangan Vijayanand, Alessandro Sette, Rafeul Alam, Shane Crotty, Bjoern Peters
Follicular helper T cells (Tfh cells) are a CD4 T cell subset essential for germinal center formation and B cell responses, although their role in allergy and allergen-specific immunotherapy (AIT) is unclear. Here, we show that AIT-treated patients have a higher ratio of regulatory Tfh cells (Tfr) to follicular T cells (Tfh) and hypothesize an IL-2 dependent mechanism.
May 12, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28504192/correlates-of-protection-for-enteric-vaccines
#8
Jan Holmgren, Umesh D Parashar, Stanley Plotkin, Jacques Louis, Su-Peing Ng, Eric Desauziers, Valentina Picot, Mitra Saadatian-Elahi
An immunological Correlate of Protection (CoP) is an immune response that is statistically interrelated with protection. Identification of CoPs for enteric vaccines would help design studies to improve vaccine performance of licensed vaccines in low income settings, and would facilitate the testing of future vaccines in development that might be more affordable. CoPs are lacking today for most existing and investigational enteric vaccines. In order to share the latest information on CoPs for enteric vaccines and to discuss novel approaches to correlate mucosal immune responses in humans with protection, the Foundation Mérieux organized an international conference of experts where potential CoPs for vaccines were examined using case-studies for both bacterial and viral enteric pathogens...
May 11, 2017: Vaccine
https://www.readbyqxmd.com/read/28503175/heterogeneity-of-phenotype-and-function-reflects-the-multistage-development-of-t-follicular-helper-cells
#9
Marta Trüb, Tom A Barr, Vicky L Morrison, Sheila Brown, Stefano Caserta, Jordan Rixon, Alasdair Ivens, David Gray
T follicular helper cells (Tfh) provide crucial signals for germinal center (GC) formation, but Tfh populations are heterogeneous. While PD1(hi) Tfh are important in the GC response, the function of the PD1(lo) Tfh-like subset is unknown. We show that these cells, like the PD1(hi) GC-Tfh, depend upon B cells; however, their entry to follicles is independent of CXCR5 or cognate interactions with B cells. The differentiation into PD1(hi) Tfh is dependent on MHC class II interactions with B cells and requires CXCR5...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28500636/immune-correlates-of-hepatitis-b-surface-antigen-spontaneous-seroconversion-in-hepatitis-b-e-antigen-negative-chronic-hepatitis-b-patients
#10
Ashish Kumar Vyas, Barjesh Chander Sharma, Shiv Kumar Sarin, Nirupma Trehanpati
BACKGROUND: Hepatitis B surface antigen (HBsAg) seroconversion in HBeAg-ve chronic hepatitis B (CHB) infection is rare, possibly due to poor antigen processing and impaired humoral response. We investigated the role of dendritic cells (DCs), T follicular helper (TFH) cells and plasma B cells in seroconversion. METHODS: HBeAg-ve (n=135) CHB patients with raised ALT at baseline were followed-up. Patients undergoing HBsAg sero-conversion (Gr. I, n=11) were compared with non-converters with low (Gr...
May 13, 2017: Liver International: Official Journal of the International Association for the Study of the Liver
https://www.readbyqxmd.com/read/28499720/t-follicular-helper-and-th2-cells-in-allergic-responses
#11
REVIEW
Masato Kubo
IL-4 is a cytokine commonly secreted by TH2 and follicular helper T (TFH) cells after antigenic sensitization. TH2 cells have been thought to be the major contributor of B cell help as a source of IL-4 responsible for class switch recombination to Immunoglobulin G1 (IgG1) and Immunoglobulin E (IgE). Importantly, there are some differences in transcriptional regulation between these two T cell subsets. The IL-4 production by TH2 and TFH cells is distinctively regulated by two pathways, GATA-3-mediated Il4-HS2 enhancer and Notch mediated Il4-CNS-2 enhancer...
May 9, 2017: Allergology International: Official Journal of the Japanese Society of Allergology
https://www.readbyqxmd.com/read/28496444/the-transcription-factor-c-maf-promotes-the-differentiation-of-follicular-helper-t-cells
#12
Fabienne Andris, Sébastien Denanglaire, Maelle Anciaux, Mélanie Hercor, Hind Hussein, Oberdan Leo
Follicular helper T cells (Tfh) have been identified as the primary cell subpopulation regulating B cell responses in germinal centers, thus supporting high-affinity antibody production. Among the transcription factors orchestrating Tfh cell differentiation and function, the role played by the proto-oncogene c-Maf remains poorly characterized. We report herein that selective loss of c-Maf expression in the T cell compartment results in defective development of Tfh cells in response to both antigen/adjuvant vaccinations and commensal intestinal bacteria...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28484447/hiv-1-and-siv-predominantly-use-ccr5-expressed-on-a-precursor-population-to-establish-infection-in-t-follicular-helper-cells
#13
Yin Xu, Chansavath Phetsouphanh, Kazuo Suzuki, Anu Aggrawal, Stephanie Graff-Dubois, Michael Roche, Michelle Bailey, Sheilajen Alcantara, Kieran Cashin, Rahuram Sivasubramaniam, Kersten K Koelsch, Brigitte Autran, Richard Harvey, Paul R Gorry, Arnaud Moris, David A Cooper, Stuart Turville, Stephen J Kent, Anthony D Kelleher, John Zaunders
BACKGROUND: T follicular helper (Tfh) cells are increasingly recognized as a major reservoir of HIV infection that will likely need to be addressed in approaches to curing HIV. However, Tfh express minimal CCR5, the major coreceptor for HIV-1, and the mechanism by which they are infected is unclear. We have previously shown that macaque Tfh lack CCR5, but are infected in vivo with CCR5-using SIV at levels comparable to other memory CD4(+) T cells. Similarly, human splenic Tfh cells are highly infected with HIV-1 DNA...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28482188/pregnancy-favors-the-expansion-of-circulating-functional-follicular-helper-t-cells
#14
Clarice Monteiro, Taissa M Kasahara, José Roberto Castro, Priscila M Sacramento, Joana Hygino, Newton Centurião, Tatiane Cassano, Lana M Ferreira Lopes, Simone Leite, Vander Guimarães Silva, Sudhir Gupta, Cleonice A M Bento
Pregnancy favors antibody production, and some evidence has suggested a direct effect of estrogen on B cells. The impact of pregnancy on circulating follicular helper T (TFH) cells, typically identified by the expression of CD45RO and CXCR5, has not been previously investigated. Here, the percentage of TFH cells, co-expressing or not PD-1, ICOS, or CXCR3 markers was significantly higher in pregnant women (PW) as compared with non-pregnant ones (nPW). Furthermore, the percentage of CXCR3(+) TFH cells able to produce IL-6, IL-21, and IL-10 was significantly higher in PW than nPW...
April 27, 2017: Journal of Reproductive Immunology
https://www.readbyqxmd.com/read/28480794/dimethyl-fumarate-induces-changes-in-b-and-t-lymphocyte-function-independent-of-the-effects-on-absolute-lymphocyte-count
#15
Erin E Longbrake, Claudia Cantoni, Salim Chahin, Francesca Cignarella, Anne H Cross, Laura Piccio
BACKGROUND: Dimethyl fumarate (DMF) is used to treat relapsing multiple sclerosis and causes lymphopenia in a subpopulation of treated individuals. Much remains to be learned about how the drug affects B- and T-lymphocytes. OBJECTIVES: To characterize changes in B- and T-cell phenotype and function induced by DMF and to investigate whether low absolute lymphocyte count (ALC) is associated with unique functional changes. METHODS: Peripheral blood mononuclear cells (PBMCs) were collected from DMF-treated patients, untreated patients, and healthy controls...
May 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/28473831/il-7-and-cd4-t-follicular-helper-cells-in-hiv-1-infection
#16
Francesca Chiodi, Yonas Bekele, Rebecka Lantto Graham, Aikaterini Nasi
IL-7 was previously shown to upregulate the expression of molecules important for interaction of CD4+ T cells with B cells. It is poorly studied whether IL-7 has a role in the biology of T follicular helper (Tfh) cells and whether IL-7 dysregulates the expression of B-cell costimulatory molecules on Tfh cells. We review the literature and provide arguments in favor of IL-7 being involved in the biology of human Tfh cells. The CD127 IL-7 receptor is expressed on circulating Tfh and non-Tfh cells, and we show that IL-7, but not IL-6 or IL-21, upregulates the expression of CD70 and PD-1 on these cells...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28472619/toll-like-receptor-4-and-hepatocellular-carcinoma-a-systematic-review
#17
REVIEW
Zahra Sepehri, Zohre Kiani, Farhad Kohan, Seyed Moayed Alavian, Saeid Ghavami
INTRODUCTION: Toll like receptor 4 (TLR4) is an extracellular pathogen recognition receptor (PRR) which recognizes a wide range of pathogens and damage associated molecular patterns (PAMPs and DAMPs). It can activate intracellular signaling and consequently transcription factors which participate in transcription from either immune related or malignancy genes. Thus, it has been hypothesized that TLR4 may be a cause of hepatocellular carcinoma (HCC). This article has reviewed the roles of TLR4 in the pathogenesis of HCC...
May 1, 2017: Life Sciences
https://www.readbyqxmd.com/read/28468971/paracrine-il-2-is-required-for-optimal-type-2-effector-cytokine-production
#18
Matthew R Olson, Benjamin J Ulrich, Sarah A Hummel, Ibrahim Khan, Brice Meuris, Yesesri Cherukuri, Alexander L Dent, Sarath Chandra Janga, Mark H Kaplan
IL-2 is a pleiotropic cytokine that promotes the differentiation of Th cell subsets, including Th1, Th2, and Th9 cells, but it impairs the development of Th17 and T follicular helper cells. Although IL-2 is produced by all polarized Th subsets to some level, how it impacts cytokine production when effector T cells are restimulated is unknown. We show in this article that Golgi transport inhibitors (GTIs) blocked IL-9 production. Mechanistically, GTIs blocked secretion of IL-2 that normally feeds back in a paracrine manner to promote STAT5 activation and IL-9 production...
May 3, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28468877/preservation-of-peripheral-t-follicular-helper-cell-function-in-hiv-controllers
#19
Supranee Buranapraditkun, Franco Pissani, Jeffrey E Teigler, Bruce T Schultz, Galit Alter, Mary Marovich, Merlin L Robb, Michael A Eller, Jeff Martin, Steven Deeks, Nelson L Michael, Hendrik Streeck
The maturation process of high-affinity antibodies is a result of intricate interactions between B cells and follicular helper T (Tfh) cells occurring in lymphoid germinal centers. HIV infection induces significant chronic immune activation, phenotypic skewing, and inflammation driven by years of continuous viral replication. High levels of viremia as well as immune activation and dysfunction have been demonstrated to have a perturbing impact on the B cell memory compartment and contribute to B cell exhaustion...
May 3, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28467912/plexin-b2-and-semaphorin-4c-guide-t-cell-recruitment-and-function-in-the-germinal-center
#20
Hu Yan, Longyan Wu, Changming Shih, Shiyue Hou, Jingwen Shi, Tianyang Mao, Wenbin Chen, Bhavani Melvin, Robert J Rigby, Yingjia Chen, Haochen Jiang, Roland H Friedel, Carola G Vinuesa, Hai Qi
Follicular T helper (TFH) cells orchestrate the germinal center (GC) response locally. TFH localization in GCs is controlled by chemo-guidance cues and antigen-specific adhesion. Here. we define an antigen-independent, contact-dependent, adhesive guidance system for TFH cells. Unusual for amoeboid cell migration, the system is composed of transmembrane plexin B2 (PlxnB2) molecule, which is highly expressed by GC B cells, and its transmembrane binding partner semaphorin 4C (Sema4C), which is upregulated on TFH cells...
May 2, 2017: Cell Reports
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