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Syk t cell

JoAnn Trial, Katarzyna A Cieslik, Mark L Entman
INTRODUCTION: We studied monocyte transendothelial migration and subsequent polarization into M1/M2 macrophages in response to C-reactive protein (CRP) with two disease-related ligands: (1) phosphocholine (PC) and (2) multilamellar liposomes containing both unoxidized and oxidized forms of the lipid, phosphatidylcholine. These ligands differ in biological origin: PC is present on bacterial cell walls while oxidized lipids are present in atherogenic lipids. METHODS: We used an in vitro model of human monocyte transendothelial migration and assessed the polarization of monocytes and T cells and signaling through Fcγ receptors in monocytes...
September 2016: Immunity, Inflammation and Disease
Yinghua Zhao, Xiao Chu, Jintong Chen, Ying Wang, Sujun Gao, Yuxue Jiang, Xiaoqing Zhu, Guangyun Tan, Wenjie Zhao, Huanfa Yi, Honglin Xu, Xingzhe Ma, Yong Lu, Qing Yi, Siqing Wang
Dectin-1 signalling in dendritic cells (DCs) has an important role in triggering protective antifungal Th17 responses. However, whether dectin-1 directs DCs to prime antitumour Th9 cells remains unclear. Here, we show that DCs activated by dectin-1 agonists potently promote naive CD4(+) T cells to differentiate into Th9 cells. Abrogation of dectin-1 in DCs completely abolishes their Th9-polarizing capability in response to dectin-1 agonist curdlan. Notably, dectin-1 stimulation of DCs upregulates TNFSF15 and OX40L, which are essential for dectin-1-activated DC-induced Th9 cell priming...
2016: Nature Communications
Deniz Cizmeci, Emma L Dempster, Olivia L Champion, Sariqa Wagley, Ozgur E Akman, Joann L Prior, Orkun S Soyer, Jonathan Mill, Richard W Titball
The potential for epigenetic changes in host cells following microbial infection has been widely suggested, but few examples have been reported. We assessed genome-wide patterns of DNA methylation in human macrophage-like U937 cells following infection with Burkholderia pseudomallei, an intracellular bacterial pathogen and the causative agent of human melioidosis. Our analyses revealed significant changes in host cell DNA methylation, at multiple CpG sites in the host cell genome, following infection. Infection induced differentially methylated probes (iDMPs) showing the greatest changes in DNA methylation were found to be in the vicinity of genes involved in inflammatory responses, intracellular signalling, apoptosis and pathogen-induced signalling...
2016: Scientific Reports
Samantha D Pauls, Arnab Ray, Sen Hou, Andrew T Vaughan, Mark S Cragg, Aaron J Marshall
SHIP is an important regulator of immune cell signaling that functions to dephosphorylate the phosphoinositide phosphatidylinositol 3,4,5-trisphosphate at the plasma membrane and mediate protein-protein interactions. One established paradigm for SHIP activation involves its recruitment to the phospho-ITIM motif of the inhibitory receptor FcγRIIB. Although SHIP is essential for the inhibitory function of FcγRIIB, it also has critical modulating functions in signaling initiated from activating immunoreceptors such as B cell Ag receptor...
September 1, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
Hyung Sook Kim, Ki Hwan Park, Hong Kyung Lee, Ji Sung Kim, Yong Guk Kim, Jae Hee Lee, Ki Hun Kim, Jieun Yun, Bang Yeon Hwang, Jin Tae Hong, Youngsoo Kim, Sang-Bae Han
Curdlan, a β-1,3-glucan isolated from Alcaligenes faecalis, is an agonist of dectin-1 in various immune cells, including dendritic cells (DCs). However, whether curdlan also activates DCs through other receptors remains unknown. In this study, we found that curdlan activates DCs through dectin-1 and toll-like receptor 4 (TLR4). Curdlan increased the expression levels of surface molecules (CD40, CD80, CD86, and MHC-I/II), the production of cytokines (IL-12, IL-1β, TNF-α, and IFN-β), migration toward MIP-3β, and allogeneic T cell stimulation activity of DCs...
October 2016: International Immunopharmacology
Nili Dezorella, Ben-Zion Katz, Mika Shapiro, Aaron Polliack, Chava Perry, Yair Herishanu
: In the last decade, the B-cell receptor has emerged as a pivotal stimulus in chronic lymphocytic leukemia pathogenesis, and a very feasible therapeutic target. The B-cell receptor responsiveness in chronic lymphocytic leukemia cells is heterogeneous among patients and correlates with aggressiveness of the disease. Here we show, for the first time, that SLP76, a key scaffold protein in T-cell receptor signaling, is ectopically expressed in chronic lymphocytic leukemia cells, with variable levels among patients, and correlates positively with unmutated immunoglobulin heavy chain variable gene mutational status and ZAP-70 expression...
July 21, 2016: Haematologica
Kaitao Li, Xue Xiang, Jie Sun, Hai-Tao He, Jianhua Wu, Yingxiao Wang, Cheng Zhu
The zeta-chain-associated protein kinase 70 kDa (ZAP-70), a member of the spleen tyrosine kinase (Syk) family, plays an essential role in early T cell receptor (TCR) signaling. Defects in ZAP-70 lead to impaired thymocyte development and peripheral T cell activation. To better understand its activation dynamics and regulation, we visualized ZAP-70 activities in single live T cells with a Förster resonance energy transfer (FRET)-based biosensor, which was designed for probing kinase activities of the Syk family...
July 6, 2016: Annals of Biomedical Engineering
Rebekah L Browning, William H Byrd, Nikhil Gupta, Jeffrey Jones, Xiaokui Mo, Erin Hertlein, Lianbo Yu, Natarajan Muthusamy, John C Byrd
The immunomodulatory drug lenalidomide has demonstrated efficacy in patients with chronic lymphocytic leukemia (CLL), despite a lack of direct cytotoxic effects in vitro The mechanism of lenalidomide efficacy in vivo is thought to occur via a combination of enhanced immune activity and an alteration of tumor cell-microenvironment interactions. We demonstrate in whole blood from patients with CLL that lenalidomide significantly depletes malignant B cells. Lenalidomide also induced production of interleukin-21 (IL21) and its mRNA in T cells from patients with CLL...
August 2016: Cancer Immunology Research
Oliver H Voss, Yousuke Murakami, Mirna Y Pena, Ha-Na Lee, Linjie Tian, David H Margulies, Jonathan M Street, Peter S T Yuen, Chen-Feng Qi, Konrad Krzewski, John E Coligan
Receptor CD300b is implicated in regulating the immune response to bacterial infection by an unknown mechanism. Here, we identified CD300b as a lipopolysaccharide (LPS)-binding receptor and determined the mechanism underlying CD300b augmentation of septic shock. In vivo depletion and adoptive transfer studies identified CD300b-expressing macrophages as the key cell type augmenting sepsis. We showed that CD300b, and its adaptor DAP12, associated with Toll-like receptor 4 (TLR4) upon LPS binding, thereby enhancing TLR4-adaptor MyD88- and TRIF-dependent signaling that resulted in an elevated pro-inflammatory cytokine storm...
June 21, 2016: Immunity
Corinna Steckner, Andreas Weber, Anne K Mausberg, Maximilian Heininger, Felicitas Opdenhövel, Bernd C Kieseier, Hans P Hartung, Harald H Hofstetter
Interleukin 17 (IL-17), produced by T cells, plays an important role in Multiple Sclerosis (MS) and its animal model, Experimental Autoimmune Encephalomyelitis (EAE). In contrast to IL-17-producing CD4+ T cells, the contribution of IL-17-producing CD8+ T cells (Tc17) in CNS autoimmunity has been investigated less intensively. Here we investigate the role of TC17 in EAE. We compare different T cell populations and their cytokine pattern in the MOG35-55- and MOG37-50-induced EAE. We detected a similar cytokine phenotype for both EAE models in the autoimmune process assessed at different stages...
September 2016: Clinical Immunology: the Official Journal of the Clinical Immunology Society
Shi Hyoung Kim, Jae Gwang Park, Yong Deog Hong, Eunji Kim, Kwang-Soo Baik, Deok Hyo Yoon, Sunggyu Kim, Mi-Nam Lee, Ho Sik Rho, Song Seok Shin, Jae Youl Cho
ETHNOPHARMACOLOGICAL RELEVANCE: Seed of Torreya nucifera (L.) Siebold & Zucc is used to treat several diseases in Asia. Reports document that T. nucifera has anti-cancer, anti-inflammatory, anti-oxidative activities. In spite of numerous findings on its pharmacological effects, the understanding of the molecular inhibitory mechanisms of the plant remains to be studied. Therefore, we aimed to explore in vitro anti-inflammatory mechanisms of ethyl acetate fraction (Tn-EE-BF) prepared from the seed of T...
July 21, 2016: Journal of Ethnopharmacology
Paolo Biancheri, Martyn R Foster, Matthew C T Fyfe, Thomas T MacDonald, Sameer Sirohi, Yemisi Solanke, Eleanor Wood, Adele Rowley, Steve Webber, Claire A Walshe
BACKGROUND: Kinases are key mediators of inflammation, highlighting the potential of kinase inhibitors as treatments for inflammatory disorders. Selective kinase inhibitors, however, have proved disappointing, particularly in the treatment of rheumatoid arthritis and inflammatory bowel disease. Consequently, to improve efficacy, attention has turned to multikinase inhibition. METHODS: The activity of a narrow spectrum kinase inhibitor, TOP1210, has been compared with selective kinase inhibitors (BIRB-796, dasatinib and BAY-61-3606) in a range of kinase assays, inflammatory cell assays, and in inflamed biopsies from patients with ulcerative colitis (UC)...
June 2016: Inflammatory Bowel Diseases
Yinan Yao, Hequan Li, Junjun Chen, Weiyi Xu, Guangdie Yang, Zhang Bao, Dajing Xia, Guohua Lu, Shuwen Hu, Jianying Zhou
During infection, triggering receptor expressed on myeloid cells-2 (TREM-2) restrains dendritic cells (DCs) and macrophages (MΦs) phagocytosis, as well as reduces pro-inflammatory cytokines release through DNAX-activation protein 12 (DAP12) signaling. However, the role of TREM-2 signaling in cancer has never been elucidated. In the current study, we found that TREM-2 was up-regulated on peripheral blood monocytes in tumor-bearing host. More TREM-2+DCs were detected in the lung of 3LL tumor-bearing mice. On the other hand, the level of TREM-2 on pulmonary MΦs positively correlated with the pathological staging of lung cancer...
May 17, 2016: Oncotarget
Ingegerd Ivanov Öfverholm, Anh Nhi Tran, Linda Olsson, Vasilios Zachariadis, Mats Heyman, Eva Rudd, Elisabeth Syk Lundberg, Magnus Nordenskjöld, Bertil Johansson, Ann Nordgren, Gisela Barbany
To identify copy number alterations (CNAs) in pediatric B-cell precursor acute lymphoblastic leukemia (BCP ALL), array comparative genomic hybridization was performed on 50 cases; detected CNAs were validated in a cohort of 191 cases analyzed by single nucleotide polymorphism arrays. Apart from CNAs involving leukemia-associated genes, recurrent deletions targeting genes not previously implicated in BCP ALL, e.g. INIP, IRF1 and PDE4B, were identified. Deletions of the DNA repair gene INIP were exclusively found in cases with t(12;21), and deletions of SH2B3 were associated with intrachromosomal amplification of chromosome 21 (p < 0...
September 2016: Leukemia & Lymphoma
Peter Szodoray, Stephanie M Stanford, Øyvind Molberg, Ludvig A Munthe, Nunzio Bottini, Britt Nakken
BACKGROUND: We recently identified a human B-cell population that is naturally autoreactive and tolerized by functional anergy (BND cells). OBJECTIVE: We sought to identify the molecular mechanism of how anergic autoreactive BND cells escape functional anergy and whether this process is altered in patients with lupus. METHODS: Isolated peripheral blood naive and BND cells were cultured with various stimuli, and their activation status was determined by using an intracellular Ca(2+) mobilization assay...
September 2016: Journal of Allergy and Clinical Immunology
A Heinrich, K A Heyl, E Klaile, M M Müller, T E Klassert, A Wiessner, K Fischer, R R Schumann, U Seifert, K Riesbeck, A Moter, B B Singer, S Bachmann, H Slevogt
The human restricted pathogen Moraxella catarrhalis is an important causal agent for exacerbations in chronic obstructive lung disease (COPD) in adults. In such patients, increased numbers of granulocytes are present in the airways, which correlate with bacteria-induced exacerbations and severity of the disease. Our study investigated whether the interaction of M. catarrhalis with the human granulocyte-specific carcinoembryonic antigen-related cell adhesion molecule (CEACAM)-3 is linked to NF-κB activation, resulting in chemokine production...
March 31, 2016: Cellular Microbiology
Wenwen Yan, Haoming Song, Jinfa Jiang, Wenjun Xu, Zhu Gong, Qianglin Duan, Chuangrong Li, Yuan Xie, Lemin Wang
The current study aimed to identify differentially expressed B cell‑associated genes in peripheral blood mononuclear cells and observe the changes in B cell activation at different stages of coronary artery disease. Groups of patients with acute myocardial infarction (AMI) and stable angina (SA), as well as healthy volunteers, were recruited into the study (n=20 per group). Whole human genome microarray analysis was performed to examine the expression of B cell‑associated genes among these three groups...
May 2016: Molecular Medicine Reports
Guo-Min Deng, Vasileios C Kyttaris, George C Tsokos
Spleen tyrosine kinase (Syk) is a member of the Src family of non-receptor tyrosine kinases, which associates directly with surface receptors, including B-cell receptor and Fcγ receptor, and is involved in a variety of signal transduction pathways. Rheumatoid arthritis (RA) and systemic lupus erythematosus are autoimmune diseases in which autoantibodies, immune complexes, and autoreactive T cells account for the expression of tissue inflammation and damage. Syk inhibitors efficiently suppress RA in patients albeit in the expression of unwanted side effects, including gastrointestinal effects, hypertension, and neutropenia...
2016: Frontiers in Immunology
Jia Lin, Svetlana Kurilova, Brandon L Scott, Elizabeth Bosworth, Bradley E Iverson, Elizabeth M Bailey, Adam D Hoppe
BACKGROUND: Recent evidence indicates that in addition to the T-cell receptor, microclustering is an important mechanism for the activation of the B-cell receptor and the mast cell Fcε-receptor. In macrophages and neutrophils, particles opsonized with immunoglobulin G (IgG) antibodies activate the phagocytic Fcγ-receptor (FcγR) leading to rearrangements of the actin cytoskeleton. The purpose of this study was to establish a system for high-resolution imaging of FcγR microclustering dynamics and the recruitment of the downstream signaling machinery to these microclusters...
2016: BMC Immunology
Ellen J Lee, Brieanna R Brown, Emily E Vance, Paige E Snow, Phyllis B Silver, David Heinrichs, Xin Lin, Yoichiro Iwakura, Christine A Wells, Rachel R Caspi, Holly L Rosenzweig
Uveitis, which occurs in association with systemic immunological diseases, presents a considerable medical challenge because of incomplete understanding of its pathogenesis. The signals that initiate T cells to target the eye, which may be of infectious or noninfectious origin, are poorly understood. Experimental autoimmune uveoretinitis (EAU) develops in mice immunized with the endogenous retinal protein interphotoreceptor retinoid binding protein in the presence of the adjuvant CFA. EAU manifests as posterior ocular inflammation consisting of vasculitis, granulomas, retinal damage, and invasion of self-reactive T cells, which are key clinical features of human uveitis...
April 1, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
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