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https://www.readbyqxmd.com/read/29676593/icos-costimulation-differentially-affects-t-cells-in-secondary-lymphoid-organs-and-inflamed-tissues
#1
Dana Vu Van, Laura Bauer, Richard A Kroczek, Andreas Hutloff
B cell interaction with follicular helper T cells and their subsequent differentiation into high-affinity antibody producing cells normally takes place in secondary lymphoid organs. The costimulator ICOS plays a key role in this process and is therefore considered as an attractive target to modulate exaggerated B cell responses in autoimmune or allergic diseases. Inflamed tissues were recently recognized as additional sites of active T cell/B cell interaction. To analyze whether ICOS costimulation is also important there, we employed a mouse airway inflammation model which allows to directly compare immune reactions in the lung-draining lymph node and the lung tissue and also to assess the relative importance of dendritic cells versus B cells as antigen-presenting cells...
April 20, 2018: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/29675022/immunoporosis-immunology-of-osteoporosis-role-of-t-cells
#2
REVIEW
Rupesh K Srivastava, Hamid Y Dar, Pradyumna K Mishra
The role of immune system in various bone pathologies, such as osteoporosis, osteoarthritis, and rheumatoid arthritis is now well established. This had led to the emergence of a modern field of systems biology called as osteoimmunology, an integrated research between fields of immunology and bone biology under one umbrella. Osteoporosis is one of the most common inflammatory bone loss condition with more than 200 million individuals affected worldwide. T helper (Th) cells along with various other immune cells are major players involved in bone homeostasis...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29672235/interleukin-7-regulates-t-follicular-helper-cell-function-in-patients-with-chronic-hepatitis-c
#3
Zhi-Hong Zhang, Ben-Chun Jiang, Xiao-Hong Liu, Meng-Xuan Zhang, Zhen-Sheng-Nan Li, Guang-Ze Zhu
Signaling through interleukin (IL)-7 is essential and required for development, differentiation, proliferation, and homeostasis of T cells. However, the role of IL-7 in regulation of CD4+ T cells in chronic viral infections was not fully elucidated. Thus, the aim of the current study was to investigate the immunomodulatory activity of IL-7 to T follicular helper (Tfh) cells and its contribution to pathogenesis of chronic HCV, hepatitis C virus (HCV) infection. A total of 47 patients with chronic hepatitis C and 19 normal controls were enrolled...
April 19, 2018: Viral Immunology
https://www.readbyqxmd.com/read/29670614/human-v%C3%AE-9v%C3%AE-2-t-cells-synergize-cd4-t-follicular-helper-cells-to-produce-influenza-virus-specific-antibody
#4
Qingyun Chen, Kun Wen, Aizhen Lv, Ming Liu, Ke Ni, Zheng Xiang, Yinping Liu, Wenwei Tu
Human Vγ9Vδ2-T cells recognize nonpeptidic antigens and exert effector functions against microorganisms and tumors, but little is known about their roles in humoral immune response against influenza virus infection. Herein, in the coculture of autologous human B cells, dendritic cells and/or naïve CD4 T cells, and Vγ9Vδ2-T cells, we demonstrated that Vγ9Vδ2-T cells could facilitate H9N2 influenza virus-specific IgG and IgM productions in a CD4 T cell-dependent manner. Vγ9Vδ2-T cells promoted the differentiation of CXCR5+ PD1+ CD4+ T follicular helper (Tfh) cells, CD19+ IgD- CD38++ plasma cells (PCs), and drove B cell proliferation as well as immunoglobulin class switching...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29670256/deviations-of-the-immune-cell-landscape-between-healthy-liver-and-hepatocellular-carcinoma
#5
Nataliya Rohr-Udilova, Florian Klinglmüller, Rolf Schulte-Hermann, Judith Stift, Merima Herac, Martina Salzmann, Francesca Finotello, Gerald Timelthaler, Georg Oberhuber, Matthias Pinter, Thomas Reiberger, Erika Jensen-Jarolim, Robert Eferl, Michael Trauner
Tumor-infiltrating immune cells are highly relevant for prognosis and identification of immunotherapy targets in hepatocellular carcinoma (HCC). The recently developed CIBERSORT method allows immune cell profiling by deconvolution of gene expression microarray data. By applying CIBERSORT, we assessed the relative proportions of immune cells in 41 healthy human livers, 305 HCC samples and 82 HCC adjacent tissues. The obtained immune cell profiles provided enumeration and activation status of 22 immune cell subtypes...
April 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29669250/t-follicular-helper-cell-germinal-center-b-cell-interaction-strength-regulates-entry-into-plasma-cell-or-recycling-germinal-center-cell-fate
#6
Wataru Ise, Kentaro Fujii, Katsuyuki Shiroguchi, Ayako Ito, Kohei Kometani, Kiyoshi Takeda, Eiryo Kawakami, Kazuo Yamashita, Kazuhiro Suzuki, Takaharu Okada, Tomohiro Kurosaki
Higher- or lower-affinity germinal center (GC) B cells are directed either to plasma cell or GC recycling, respectively; however, how commitment to the plasma cell fate takes place is unclear. We found that a population of light zone (LZ) GC cells, Bcl6lo CD69hi expressing a transcription factor IRF4 and higher-affinity B cell receptors (BCRs) or Bcl6hi CD69hi with lower-affinity BCRs, favored the plasma cell or recycling GC cell fate, respectively. Mechanistically, CD40 acted as a dose-dependent regulator for Bcl6lo CD69hi cell formation...
April 17, 2018: Immunity
https://www.readbyqxmd.com/read/29666264/correction-for-serr-et-al-mirna92a-targets-klf2-and-the-phosphatase-pten-signaling-to-promote-human-t-follicular-helper-precursors-in-t1d-islet-autoimmunity
#7
(no author information available yet)
No abstract text is available yet for this article.
April 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29666117/novel-insights-into-the-pathogenesis-of-t-cell-lymphomas
#8
John S Van Arnam, Megan S Lim, Kojo S J Elenitoba-Johnson
T-cell lymphomas are a heterogeneous group of rare malignancies with overlapping clinical, immunologic and histologic features. Recent advances in our understanding of T-cell differentiation based on gene expression profiling, next-generation sequencing (NGS) and transgenic mouse modeling studies have better elucidated the pathogenetic mechanisms underlying the diverse biology of T-cell lymphomas. These studies show that while genetic alterations in epigenetic modifiers are implicated in all subtypes of T-cell lymphomas, specific subtypes demonstrate enrichment for particular recurrent alterations targeting specific genes...
April 17, 2018: Blood
https://www.readbyqxmd.com/read/29660266/role-of-stem-cell-like-memory-t-cells-in-systemic-lupus-erythematosus
#9
Ye Ji Lee, Ji Ah Park, Hyunmi Kwon, Youn Soo Choi, Kyeong Cheon Jung, Seong Hoe Park, Eun Bong Lee
OBJECTIVE: Stem cell-like memory T (TSCM ) cells are long-lived memory T cells that have multipotent capacity to differentiate into different subsets. However, the role of TSCM cells in autoimmune diseases remains unclear. Here, we performed phenotypic studies to identify TSCM cells in patients suffering from systemic lupus erythematosus (SLE). METHODS: CD4+ and CD8+ TSCM cells were identified in SLE patients and healthy controls (HCs). In vitro culture systems, CD4+ TSCM cells were induced to differentiate into subsets of T cells, including follicular helper T (TFH ) cells and cytokine production pattern was measured after stimulation...
April 16, 2018: Arthritis & Rheumatology
https://www.readbyqxmd.com/read/29652652/circulating-follicular-helper-t-cells-cd4-cxcr5-icos-decrease-in-patients-with-rheumatoid-arthritis-treated-with-abatacept
#10
Silvia Piantoni, Francesca Regola, Mirko Scarsi, Angela Tincani, Paolo Airò
No abstract text is available yet for this article.
April 13, 2018: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/29626573/correlation-of-allergen-specific-t-follicular-helper-cells-with-specific-ige-and-efficacy-of-allergen-immunotherapy
#11
Yin Yao, Cai-Ling Chen, Nan Wang, Zhi-Chao Wang, Jin Ma, Rong-Fei Zhu, Xiao-Yan Xu, Peng-Cheng Zhou, Di Yu, Zheng Liu
Allergen-specific IL-4+ Tfh cells may contribute to allergen-specific IgE production and correlate with clinical efficacy of AIT in AR patients, which may be a promising therapeutic target and biomarker for AIT in AR.
April 4, 2018: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/29626172/-that-s-not-helping-t-follicular-helper-cells-drive-skin-fibrosis
#12
Rachael A Clark
T follicular helper-like cells and IL-21 are drivers of skin fibrosis in systemic sclerosis.
April 6, 2018: Science Immunology
https://www.readbyqxmd.com/read/29626170/the-receptor-repertoire-and-functional-profile-of-follicular-t-cells-in-hiv-infected-lymph-nodes
#13
Ben S Wendel, Daniel Del Alcazar, Chenfeng He, Perla M Del Río-Estrada, Benjamas Aiamkitsumrit, Yuria Ablanedo-Terrazas, Stefany M Hernandez, Ke-Yue Ma, Michael R Betts, Laura Pulido, Jun Huang, Phyllis A Gimotty, Gustavo Reyes-Terán, Ning Jiang, Laura F Su
Follicular helper CD4+ T cells (TFH ) play an integral role in promoting B cell differentiation and affinity maturation. Whereas TFH cell frequencies are increased in lymph nodes (LNs) from individuals infected with HIV, humoral immunity remains impaired during chronic HIV infection. Whether HIV inhibits TFH responses in LNs remains unclear. Advances in this area have been limited by the difficulty of accessing human lymphoid tissues. Here, we combined high-dimensional mass cytometry with T cell receptor repertoire sequencing to interrogate the composition of TFH cells in primary human LNs...
April 6, 2018: Science Immunology
https://www.readbyqxmd.com/read/29617174/prolonged-follicular-helper-t-cell-responses-in-me7-scrapie-infected-mice
#14
Soochan Kim, Sinsuk Han, Taehyun Kim, Jeehoon Nam, Yong-Sun Kim, Eun-Kyoung Choi, Mi-Yeon Kim
We previously reported that mice intracerebrally inoculated with the mouse-adapted scrapie strain ME7 have markedly diminished T zones in the spleen due to the decreased expression of CCL19 and CCL21. In addition, follicular dendritic cell networks in germinal centers were larger in ME7-infected spleens compared to uninfected spleens. As an extension of that study, we set out to determine how ME7 infection affects spleen structure and follicular helper T (Tfh) cell responses in mice. For this study, mice were intraperitoneally inoculated with brain homogenate of the ME7 inoculum and spleens were analyzed 50, 130, and 200 days after inoculation and compared with those from uninfected mice...
April 4, 2018: Prion
https://www.readbyqxmd.com/read/29616025/differences-between-pediatric-and-adult-t-cell-responses-to-in-vitro-staphylococcal-enterotoxin-b-stimulation
#15
Mark E Rudolph, Monica A McArthur, Robin S Barnes, Laurence S Magder, Wilbur H Chen, Marcelo B Sztein
Toxic shock syndrome (TSS) is capable of inducing life-threatening fever, rash, and systemic organ failure, though the specific mechanisms behind these symptoms remain poorly understood. Staphylococcal enterotoxin B (SEB) and other superantigens have shown to be important factors in TSS, capable of promoting cross-linking between T cell receptors and major histocompatibility complexes which results in overwhelming T cell activation, proliferation, and cytokine production. The resulting proinflammatory cytokine cascade, often referred to as the "cytokine storm," seems to be critical to the development of disease...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29616024/simian-immunodeficiency-virus-siv-specific-chimeric-antigen-receptor-t-cells-engineered-to-target-b-cell-follicles-and-suppress-siv-replication
#16
Kumudhini Preethi Haran, Agnes Hajduczki, Mary S Pampusch, Gwantwa Mwakalundwa, Diego A Vargas-Inchaustegui, Eva G Rakasz, Elizabeth Connick, Edward A Berger, Pamela J Skinner
There is a need to develop improved methods to treat and potentially cure HIV infection. During chronic HIV infection, replication is concentrated within T follicular helper cells (Tfh) located within B cell follicles, where low levels of virus-specific CTL permit ongoing viral replication. We previously showed that elevated levels of simian immunodeficiency virus (SIV)-specific CTL in B cell follicles are linked to both decreased levels of viral replication in follicles and decreased plasma viral loads. These findings provide the rationale to develop a strategy for targeting follicular viral-producing (Tfh) cells using antiviral chimeric antigen receptor (CAR) T cells co-expressing the follicular homing chemokine receptor CXCR5...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29614339/key-gene-co-expression-modules-and-functional-pathways-involved-in-the-pathogenesis-of-graves-disease
#17
Xiaoqing Shao, Bin Wang, Kaida Mu, Ling Li, Qian Li, Weiwei He, Qiuming Yao, Xi Jia, Jin-An Zhang
Graves' disease (GD) is a common autoimmune thyroid disease characterized by positive thyroid stimulating hormone receptor antibody. To better understand its molecular pathogenesis, we adopted the weighted gene co-expression network analysis to reveal co-expression modules of key genes involved in the pathogenesis of GD, protein-protein interaction network analysis to identify the hub genes related to GD development and functional analyses to explore their possible functions. Our results showed that 1) a total of 2667 differentially expressed genes in our microarray study and 16 different gene co-expression modules were associated with GD, and 2) the most significant module was associated with the percentage of macrophages, T follicular helper cells and CD4+ memory T cells and mainly enriched in immune regulation and immune response...
March 31, 2018: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/29610141/altered-ratio-of-t-follicular-helper-cells-to-t-follicular-regulatory-cells-correlates-with-autoreactive-antibody-response-in-simian-immunodeficiency-virus-infected-rhesus-macaques
#18
Wenjin Fan, Andrew James Demers, Yanmin Wan, Qingsheng Li
Individuals with chronic HIV-1 infection have an increased prevalence of autoreactive Abs. Many of the isolated HIV broadly neutralizing Abs from these individuals are also autoreactive. However, the underlying mechanism(s) that produce these autoreactive broadly neutralizing Abs remains largely unknown. The highly regulated coordination among B cells, T follicular helper (TFH ) cells, and T follicular regulatory (TFR ) cells in germinal centers (GCs) of peripheral lymphatic tissues (LTs) is essential for defense against pathogens while also restricting autoreactive responses...
April 2, 2018: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29595664/roles-of-t-follicular-helper-cells-in-the-pathogenesis-of-adenoidal-hypertrophy-combined-with-secretory-otitis-media
#19
Chunyan Feng, Qicheng Zhang, Guangquan Zhou, Jing Zhang, Yanshu Zhang
The aim of this study was to investigate the roles of T follicular helper (Tfh) cells in secretory otitis media (SOM) combined with adenoidal hypertrophy (AH).Patients with AH or AH combined with SOM admitted to the Yancheng No. 1 People's Hospital from December 2012 to December 2014 were included. Fourteen age-matched healthy individuals received physical examinations in the hospital served as control. The venous Tfh was determined using flow cytometry, and CD3 + CD4 + CXCR5 + T lymphocytes were defined as Tfh cells...
March 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29593732/a-distinct-t-follicular-helper-cell-subset-infiltrates-the-brain-in-murine-neuropsychiatric-lupus
#20
Shweta Jain, Ariel Stock, Fernando Macian, Chaim Putterman
Neuropsychiatric symptoms in systemic lupus erythematosus (SLE) are not uncommon, yet the mechanisms underlying disease initiation and progression in the brain are incompletely understood. Although the role of T cells in other lupus target organs such as the kidney is well defined, which T cells contribute to the pathogenesis of neuropsychiatric SLE is not known. The present study was aimed at characterizing the CD4 T cell populations that are present in the choroid plexus (CP) of MRL/MpJ-fas lpr mice, the primary site of brain infiltration in this classic lupus mouse model which exhibits a prominent neurobehavioral phenotype...
2018: Frontiers in Immunology
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