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https://www.readbyqxmd.com/read/28817118/altered-marginal-zone-and-innate-like-b-cells-in-aged-senescence-accelerated-samp8-mice-with-defective-igg1-responses
#1
Isabel Cortegano, Mercedes Rodríguez, Isabel Martín, Maria Carmen Prado, Carolina Ruíz, Rafael Hortigüela, Mario Alía, Marçal Vilar, Helena Mira, Eva Cano, Mercedes Domínguez, Belén de Andrés, María Luisa Gaspar
Aging has a strong impact on the activity of the immune system, enhancing susceptibility to pathogens and provoking a predominant pre-inflammatory status, whereas dampening responses to vaccines in humans and mice. Here, we demonstrate a loss of marginal zone B lymphocytes (MZ, CD19(+)CD45R(+)CD21(++)CD23(lo)) and a decrease of naive B cells (CD19(+)IgD(+)), whereas there is an enhancement of a CD19(+)CD45R(lo) innate-like B cell population (B1REL) and the so-called aged B cell compartment (ABC, CD45R(+)CD21(lo)CD23(lo)CD5(-)CD11b(-)) in aged senescence-accelerated (SAMP8) mice but not in aged senescence-resistant (SAMR1) mice...
August 17, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28816516/vibrio-vulnificus-vvha-induces-th1-and-tfh-cells-to-proliferate-against-vibrio-vulnificus-in-a-mouse-model-of-infection
#2
Ming-Yi Wang, Xiao-Fei Liu, Jun Xia, Yu Li, Jian-Li Geng, Cheng-Jin Hu
AIM: To characterize the roles of VvhA in host's acquired immune response to Vibrio vulnificus infection. MATERIALS & METHODS: The recombinant VvhA fusion protein was used to immunize mice and the anti-VvhA polyclonal antibody was produced in vivo for prophylactic and therapeutic efficacy assay. The roles of VvhA in T helper (Th) cells differentiation were analyzed by vvhA-deleted mutant during the early phase of infection, while the ratio of Th2 and T follicular helper (Tfh) cells were examined in VvhA immunization...
August 17, 2017: Future Microbiology
https://www.readbyqxmd.com/read/28811467/the-mtorc1-4e-bp-eif4e-axis-controls-de-novo-bcl6-protein-synthesis-in-t-cells-and-systemic-autoimmunity
#3
Woelsung Yi, Sanjay Gupta, Edd Ricker, Michela Manni, Rolf Jessberger, Yurii Chinenov, Henrik Molina, Alessandra B Pernis
Post-transcriptional modifications can control protein abundance, but the extent to which these alterations contribute to the expression of T helper (TH) lineage-defining factors is unknown. Tight regulation of Bcl6 expression, an essential transcription factor for T follicular helper (TFH) cells, is critical as aberrant TFH cell expansion is associated with autoimmune diseases, such as systemic lupus erythematosus (SLE). Here we show that lack of the SLE risk variant Def6 results in deregulation of Bcl6 protein synthesis in T cells as a result of enhanced activation of the mTORC1-4E-BP-eIF4E axis, secondary to aberrant assembly of a raptor-p62-TRAF6 complex...
August 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28810929/the-impact-of-age-and-gut-microbiota-on-th17-and-tfh-cells-in-k-bxn-autoimmune-arthritis
#4
Fei Teng, Krysta M Felix, C Pierce Bradley, Debdut Naskar, Heqing Ma, Walid A Raslan, Hsin-Jung Joyce Wu
BACKGROUND: Age is an important risk factor for rheumatoid arthritis (RA), which often develops in middle age. However, how age-associated changes in immunity impact RA is poorly understood. Gut microbiota are known to be involved in the pathogenesis of RA, but the effects of microbiota in older subjects remain mostly unknown. METHODS: We used segmented filamentous bacteria (SFB), a gut commensal species with immunomodulatory effects, and K/BxN mice, a T cell receptor (TCR) transgenic model, to study the effect of age and microbiota on autoimmune arthritis...
August 15, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28810548/effect-of-follicular-helper-t-cells-on-the-pathogenesis-of-asthma
#5
Xiaojuan Ma, Zhan Sun, Pei Zhai, Wenyan Yu, Ting Wang, Fengsen Li, Jianbing Ding
Follicular helper T (TFH) cells are considered to be a separate T helper cell subset, specifically to help memory B cell participate in humoral immunity. It has been reported that there is an association between the imbalance of TFH function and certain autoimmune diseases. However, to the best of our knowledge, the effect of TFH cells on the process of bronchial asthma has not been investigated. The aim of the present study was to investigate the associated markers of TFH cells in bronchial asthma-induced mice...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28806642/circulating-follicular-helper-t-cells-presented-distinctively-different-responses-toward-bacterial-antigens-in-primary-biliary-cholangitis
#6
Zun-Qiang Zhou, Da-Nian Tong, Jiao Guan, Mei-Fang Li, Qi-Ming Feng, Min-Jie Zhou, Zheng-Yun Zhang
Primary biliary cholangitis (PBC) is a chronic and progressive cholestatic liver disease with unknown causes. The initiation of PBC is associated with bacterial infections and abnormal immune correlates, such as the presence of self-reactive anti-mitochondrial antibodies and shifted balance of T cell subsets. In particular, the CD4(+)CXCR5(+) follicular helper T (Tfh) cells are highly activated in PBC patients and are significantly associated with PBC severity, but the underlying reasons are unknown. In this study, we found that the circulating CD4(+)CXCR5(+) T cells were enriched with the interferon (IFN)-γ-secreting Th1-subtype and the interleukin (IL)-17-secreting Th17-subtype, but not the IL-4-secreting Th2 subtype...
August 11, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28802258/human-blood-tfr-cells-are-indicators-of-ongoing-humoral-activity-not-fully-licensed-with-suppressive-function
#7
Valter R Fonseca, Ana Agua-Doce, Ana Raquel Maceiras, Wim Pierson, Filipa Ribeiro, Vasco C Romão, Ana Rita Pires, Susana Lopes da Silva, João Eurico Fonseca, Ana E Sousa, Michelle A Linterman, Luis Graca
Germinal center (GC) responses are controlled by T follicular helper (Tfh) and T follicular regulatory (Tfr) cells and are crucial for the generation of high-affinity antibodies. Although the biology of human circulating and tissue Tfh cells has been established, the relationship between blood and tissue Tfr cells defined as CXCR5(+)Foxp3(+) T cells remains elusive. We found that blood Tfr cells are increased in Sjögren syndrome, an autoimmune disease with ongoing GC reactions, especially in patients with high autoantibody titers, as well as in healthy individuals upon influenza vaccination...
August 11, 2017: Science Immunology
https://www.readbyqxmd.com/read/28789968/b-cell-phenotypes-signaling-and-their-roles-in-secretion-of-antibodies-in-systemic-lupus-erythematosus
#8
Yoshiya Tanaka, Satoshi Kubo, Shigeru Iwata, Maiko Yoshikawa, Shingo Nakayamada
B cells play a pivotal role in the initiation and perpetuation of SLE. Because SLE is molecularly and clinically heterogeneous, efficacious targeted therapy to clinical remission has not yet been established in SLE. We have found i) statistical clustering between Tfh cells and class-switched memory B cells and the upregulated transition from CXCR5(+) IgM memory B cells to CXCR3(+) class-switched memory B cells in SLE by 8-color flow cytometry, ii) the involvement of Syk, Btk and JAK in the activation and differentiation of B cells in SLE, iii) SLE patients was divided to 3 groups based on immunophenotypic analysis and statistical analysis and patients in the Tfh/class-switched B cell-dominant group were most refractory to conventional therapies although 3 groups had similar clinical features...
August 5, 2017: Clinical Immunology: the Official Journal of the Clinical Immunology Society
https://www.readbyqxmd.com/read/28772217/interaction-between-galectin-9-tim-3-pathway-and-follicular-helper-cd4-t-cells-contributes-to-viral-persistence-in-chronic-hepatitis-c
#9
Ya Zhuo, Yi-Fu Zhang, Hong-Jie Wu, Lei Qin, Yan-Ping Wang, A-Min Liu, Xin-Hong Wang
Both Galectin 9 (Gal-9)/T-cell immunoglobulin and mucin domain-containing protein 3 (TIM-3) pathway and follicular helper CD4(+) T (Tfh) cells play important roles in persistent hepatitis C virus (HCV) infection. Thus, we aimed to investigate the regulatory role of interaction between Gal-9/TIM-3 pathway and Tfh cells in chronic hepatitis C. A total of 44 chronic hepatitis C patients and 19 normal controls (NCs) were enrolled in this study. Purified CD4(+) T cells were cultured by TIM-3 Fc protein, recombinant Gal-9, or IL-21 for 48h...
July 31, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28760610/macrophage-derived-insulin-like-growth-factor-1-affects-influenza-vaccine-efficacy-through-the-regulation-of-immune-cell-homeostasis
#10
Il-Sub Yoon, Hyelim Park, Hye-Won Kwak, Yong Woo Jung, Jae-Hwan Nam
The level of antibody production induced by a vaccine involves a variety of host factors. One of these, insulin-like growth factor-1 (IGF-1), plays an important role in lymphocyte maturation and antibody expression. Here, we investigated the role of macrophage-derived IGF-1 in the induction of influenza vaccine-specific antibodies using macrophage-derived IGF-1 gene knockout (MIKO) mice. The titers of vaccine-specific total immunoglobulin G (IgG) and IgG1 after immunization were about two- to fourfold lower in MIKO mice than in WT mice...
July 28, 2017: Vaccine
https://www.readbyqxmd.com/read/28756244/high-frequency-of-bob1-lo-t-follicular-helper-cells-in-florid-reactive-follicular-hyperplasia
#11
Hiroshi Matsumiya, Koji Kawata, Ryuta Kamekura, Chieko Tsubomatsu, Sumito Jitsukawa, Takamasa Asai, Syunsuke Akasaka, Motonari Kamei, Keiji Yamashita, Fumie Ito, Terufumi Kubo, Noriyuki Sato, Ken-Ichi Takano, Tetsuo Himi, Shingo Ichimiya
Florid reactive follicular hyperplasia (FRFH), which is characterized by large germinal centers (GCs) within normal lymphoid follicles, is often observed in benign lesions of lymph nodes and other tissues. Because of the histologic similarity of FRFH to tumorous lesions such as follicular lymphoma, careful pathological examination is required to evaluate such lesions; however, little is known about the mechanism underlying the development of FRFH. In this study, we investigated T follicular helper (Tfh) cells in hyperplastic tonsils of patients with obstructive sleep apnea syndrome (OSA), which frequently exhibits typical FRFH...
July 26, 2017: Immunology Letters
https://www.readbyqxmd.com/read/28751644/minimal-hepatic-encephalopathy-is-associated-with-expansion-and-activation-of-cd-4-cd28-th22-and-tfh-and-b-lymphocytes
#12
Alba Mangas-Losada, Raquel García-García, Amparo Urios, Desamparados Escudero-García, Joan Tosca, Remedios Giner-Durán, Miguel Angel Serra, Carmina Montoliu, Vicente Felipo
Peripheral inflammation acts synergistically with hyperammonemia in inducing neurological alterations in cirrhotic patients with minimal hepatic encephalopathy (MHE). We hypothesized that appearance of MHE would be associated to some specific qualitative change in peripheral inflammation. The aim of this work was to characterize the changes in peripheral inflammation associated to appearance of MHE. We analyzed it by immunophenotyping and cytokine profile analysis, in cirrhotic patients without or with MHE and controls...
July 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28749570/hepatocyte-derived-exosomes-promote-t-follicular-regulatory-cell-expansion-during-hcv-infection
#13
Dustin A Cobb, Lucy Golden-Mason, Hugo R Rosen, Young S Hahn
Hepatitis C virus (HCV) is a global health concern that can cause severe liver disease such as cirrhosis and hepatocellular carcinoma. Control of HCV requires vigorous T cell responses, yet CD4(+) T cells in chronic HCV patients are dysfunctional. T follicular regulatory (Tfr) cells are a subset of regulatory T cells that suppress T follicular helper (Tfh) cells and the generation of high affinity antibody-producing B cells. In this study, we examined the accumulation of Tfr cells in the liver compartment during chronic HCV infection and defined the cellular and molecular mechanisms underlying their expansion...
July 27, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28748530/il-6-promotes-cd4-t-cell-and-b-cell-activation-during-plasmodium-infection
#14
Ismail Sebina, Lily G Fogg, Kylie R James, Megan S F Soon, Jasmin Akter, Bryce S Thomas, Geoffrey R Hill, Christian R Engwerda, Ashraful Haque
AIMS: Humoral immunity develops in the spleen during blood-stage Plasmodium infection. This elicits parasite-specific IgM and IgG, which control parasites and protect against malaria. Studies in mice have elucidated cells and molecules driving humoral immunity to Plasmodium, including CD4(+) T-cells, B-cells, interleukin (IL)-21 and ICOS. IL-6, a cytokine readily detected in Plasmodium-infected mice and humans, is recognized in other systems as a driver of humoral immunity. Here, we examined the effect of infection-induced IL-6 on humoral immunity to Plasmodium...
July 27, 2017: Parasite Immunology
https://www.readbyqxmd.com/read/28747608/igg4-related-disease-mechanistic-insights-from-both-clinical-and-immunologic-understanding-of-this-condition
#15
Takashi Maehara
  IgG4-related disease (IgG4-RD) is a chronic inflammatory disease characterized by tumescent lesions with characteristic storiform fibrosis, obliterative phlebitis and a marked lymphoplasmacytic infiltrate that includes a large number of IgG4 positive plasma cells. It's widely accepted that rituximab-mediated B cell depletion therapy is effective for this disease. Important mechanistic insights correlated with the pathogenesis of IgG4-RD have been gradually disclosed from studies of patients treated by B cell depletion...
2017: Nihon Rinshō Men'eki Gakkai Kaishi, Japanese Journal of Clinical Immunology
https://www.readbyqxmd.com/read/28738289/germinal-center-enhancement-by-extended-antigen-availability
#16
REVIEW
Kimberly M Cirelli, Shane Crotty
Vaccine elicitation of protective antibody responses has proved difficult for a number of important human pathogens, including HIV-1. The amount of somatic hypermutation associated with the development of broadly neutralizing antibodies against HIV has not been achieved using conventional immunization strategies. An underexplored aspect of vaccine design is modulation of antigen kinetics. Immunization strategies with extended antigen availability have recently been shown to enhance humoral responses. In this review, we explore the mechanisms through which sustained antigen availability can enhance germinal center responses and the potency of antibody responses...
July 21, 2017: Current Opinion in Immunology
https://www.readbyqxmd.com/read/28728856/achaete-scute-complex-homologue-2-accelerates-the-development-of-sj%C3%A3-gren-s-syndrome-like-disease-in-the-nod-shiltj-mouse
#17
Sung-Min Kim, Jeong-Eun Kwon, Jin-Sil Park, Hyeon-Beom Seo, Kyung-Ah Jung, Young-Mee Moon, Jennifer Lee, Seung-Ki Kwok, Mi-La Cho, Sung-Hwan Park
Achaete-scute complex homologue 2 (Ascl2) has been reported to induce the differentiation and activation of follicular helper T (TFH) cells, which are essential for development of Sjögren's syndrome (SS). This study examined whether Ascl2 plays a role in the development of SS. NOD/ShiLtJ mice were injected with an Ascl2-overexpression vector, and the infiltration of lymphocytes into salivary and lacrimal glands was assessed. The expression of inflammatory cytokines and chemoattractants for T or B cells was measured...
July 17, 2017: Immunology Letters
https://www.readbyqxmd.com/read/28709914/the-ratio-of-circulating-follicular-t-helper-cell-to-follicular-t-regulatory-cell-is-correlated-with-disease-activity-in-systemic-lupus-erythematosus
#18
Bihua Xu, Shuang Wang, Mianjing Zhou, Yuefang Huang, Rong Fu, Chaohuan Guo, Jingxian Chen, Jijun Zhao, Felicia Gaskin, Shu Man Fu, Niansheng Yang
Follicular T regulatory (Tfr) cells inhibit follicular T helper (Tfh) cells mediated B cell responses. Tfh cells are involved in the pathogenesis of systemic lupus erythematosus (SLE). However, the role of Tfr cells in SLE remains unclear. The frequency of circulating Tfr and Tfh cells were examined in SLE patients and healthy controls. The frequency of circulating Tfr cell decreased and Tfh/Tfr ratio increased in SLE patients. Serum anti-dsDNA antibody level positively correlated with frequency of Tfh cells and Tfh/Tfr ratios but negatively correlated with the frequency of Tfr cells...
July 12, 2017: Clinical Immunology: the Official Journal of the Clinical Immunology Society
https://www.readbyqxmd.com/read/28704588/here-there-and-everywhere-t-follicular-helper-cells-on-the-move
#19
REVIEW
Cindy S Ma, Tri Giang Phan
T follicular helper (Tfh) cells have the important function of providing B-cell help for the induction of antigen-specific antibody production. As such, it is important to determine the factors that regulate the development, differentiation and function of Tfh cells. This review highlights some of the recent advances in our understanding of Tfh cell migration, Tfh cell memory and the origins and fate of circulating Tfh cells in the blood, that have been revealed from studies in humans and mice.
July 13, 2017: Immunology
https://www.readbyqxmd.com/read/28700710/t-follicular-helper-cells-regulate-the-activation-of-b-lymphocytes-and-antibody-production-during-plasmodium-vivax-infection
#20
Maria Marta Figueiredo, Pedro Augusto Carvalho Costa, Suelen Queiroz Diniz, Priscilla Miranda Henriques, Flora Satiko Kano, Mauro Sugiro Tada, Dhelio Batista Pereira, Irene Silva Soares, Olindo Assis Martins-Filho, Dragana Jankovic, Ricardo Tostes Gazzinelli, Lis Ribeiro do Valle Antonelli
Although the importance of humoral immunity to malaria has been established, factors that control antibody production are poorly understood. Follicular helper T cells (Tfh cells) are pivotal for generating high-affinity, long-lived antibody responses. While it has been proposed that expansion of antigen-specific Tfh cells, interleukin (IL) 21 production and robust germinal center formation are associated with protection against malaria in mice, whether Tfh cells are found during Plasmodium vivax (P. vivax) infection and if they play a role during disease remains unknown...
July 2017: PLoS Pathogens
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