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MHC inflammation

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https://www.readbyqxmd.com/read/28396236/skin-inflammation-induced-by-lupus-serum-was-inhibited-in-il-1r-deficient-mice
#1
Xiaoyan Li, Xuanxuan Guo, Huicheng Liu, Gongming Gao, Guangqiong Xu, Xibin Fei, Xiang Fang, Wei Qiao, Guo-Min Deng
Skin inflammation induced by lupus serum is a useful tool to investigate the pathogenesis of lupus skin injury. IL-1 is a proinflammatory cytokine, and its role in lupus skin lesion is still unclear. We determined the role of IL-1 in lupus skin injury by using gene deficient mice. We found that skin inflammation induced by lupus serum was significantly reduced in IL-1R deficient mice and caspase-1 deficient mice. IL-1R deficiency did not affect the expression of FcγRI (CD64), FcγRII (CD32) and MHC class II (CD74) induced by lupus serum...
April 7, 2017: Clinical Immunology: the Official Journal of the Clinical Immunology Society
https://www.readbyqxmd.com/read/28389591/cd11c-expressing-cells-affect-regulatory-t-cell-behavior-in-the-meninges-during-central-nervous-system-infection
#2
Carleigh A O'Brien, Christopher Overall, Christoph Konradt, Aisling C O'Hara Hall, Nikolas W Hayes, Sagie Wagage, Beena John, David A Christian, Christopher A Hunter, Tajie H Harris
Regulatory T cells (Tregs) play an important role in the CNS during multiple infections, as well as autoimmune inflammation, but the behavior of this cell type in the CNS has not been explored. In mice, infection with Toxoplasma gondii leads to a Th1-polarized parasite-specific effector T cell response in the brain. Similarly, Tregs in the CNS during T. gondii infection are Th1 polarized, as exemplified by their T-bet, CXCR3, and IFN-γ expression. Unlike effector CD4(+) T cells, an MHC class II tetramer reagent specific for T...
April 7, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28358370/the-role-of-autophagy-in-asparaginase-induced-immune-suppression-of-macrophages
#3
Ping Song, Ziyu Wang, Xuyao Zhang, Jiajun Fan, Yubin Li, Qicheng Chen, Shaofei Wang, Peipei Liu, Jingyun Luan, Li Ye, Dianwen Ju
Erwinia asparaginase, a bacteria-derived enzyme drug, has been used in the treatment of various cancers, especially acute lymphoblastic leukemia (ALL). One of the most significant side effects associated with asparaginase administration is immune suppression, which limits its application in clinic. Macrophages are phagocytic immune cells and have a central role in inflammation and host defense. We reported here that asparaginase disturbed the function of macrophages including phagocytosis, proliferation, ROS and nitric oxide secretion, interleukin 6 (IL-6) and tumor necrosis factor α (TNF-α) secretion, and major histocompatibility complex II (MHC-II) molecule expression, thus induced immune suppression in interferon-γ and lipopolysaccharide-stimulated macrophages...
March 30, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28355202/microrna-155-modulates-bile-duct-inflammation-via-targeting-suppressor-of-cytokine-signaling-1-in-biliary-atresia
#4
Rui Zhao, Rui Dong, Yifan Yang, Yuqing Wang, Jin Ma, Jiang Wang, Hao Li, Shan Zheng
BACKGROUND: Biliary atresia (BA) is an etiologically perplexing disease, manifested by neonatal cholestasis, repeated cholangitis, and progressive biliary fibrosis. MiR-155 has been implicated to modulate the immune response, which contributes to biliary injury. However, its potential role in the pathogenesis of BA has not been addressed so far. METHODS: The microRNA changes from BA patients and controls were identified via microarray. The immunomodulatory function of miR-155 was investigated via cell transfection and reporter assay system...
March 29, 2017: Pediatric Research
https://www.readbyqxmd.com/read/28350795/fine-mapping-of-the-human-leukocyte-antigen-locus-as-a-risk-factor-for-alzheimer-disease-a-case-control-study
#5
Natasha Z R Steele, Jessie S Carr, Luke W Bonham, Ethan G Geier, Vincent Damotte, Zachary A Miller, Rahul S Desikan, Kevin L Boehme, Shubhabrata Mukherjee, Paul K Crane, John S K Kauwe, Joel H Kramer, Bruce L Miller, Giovanni Coppola, Jill A Hollenbach, Yadong Huang, Jennifer S Yokoyama
BACKGROUND: Alzheimer disease (AD) is a progressive disorder that affects cognitive function. There is increasing support for the role of neuroinflammation and aberrant immune regulation in the pathophysiology of AD. The immunoregulatory human leukocyte antigen (HLA) complex has been linked to susceptibility for a number of neurodegenerative diseases, including AD; however, studies to date have failed to consistently identify a risk HLA haplotype for AD. Contributing to this difficulty are the complex genetic organization of the HLA region, differences in sequencing and allelic imputation methods, and diversity across ethnic populations...
March 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28349485/monitoring-migration-of-activated-t-cells-to-antigen-rich-non-lymphoid-tissue
#6
Eleanor Jayne Ward, Hongmei Fu, Federica Marelli-Berg
Effective immunity requires appropriate recirculation of naïve T cells through secondary lymphoid organs and migration of antigen-specific T cells to sites of inflammation. Leukocyte migration is a highly regulated process requiring specific interactions between leukocytes and endothelial cells (EC) termed collectively as the leukocyte adhesion cascade. Recruitment and retention of activated T cells to antigen-rich sites of inflammation is a key event in the immune response, which relies in part on local antigen presentation particularly by EC of inflamed vessels...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28340094/nlrp2-is-a-suppressor-of-nf-%C3%A6-b-signaling-and-hla-c-expression-in-human-trophoblasts
#7
Tamara Tilburgs, Torsten B Meissner, Leonardo M R Ferreira, Arend Mulder, Kiran Musunuru, Junqiang Ye, Jack L Strominger
During human pregnancy, fetal extravillous trophoblasts (EVT) play a key role in the regulation of maternal T cell and NK cell responses. EVT display a unique combination of Human Leukocyte Antigens (HLA); EVT do not express HLA-A and HLA-B, but do express HLA-C, HLA-E and HLA-G. The mechanisms establishing this unique HLA expression pattern have not been fully elucidated. The MHC class I and class II transcriptional activators NLRC5 and CIITA are expressed neither by EVT nor by the EVT model cell line JEG3, which has an MHC expression pattern identical to that of EVT...
March 7, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28339731/obesity-associated-cardiac-pathogenesis-in-broiler-breeder-hens-development-of-metabolic-cardiomyopathy2-3
#8
C Y Chen, Y F Huang, Y J Ko, Y J Liu, Y H Chen, R L Walzem, S E Chen
Feed intake is typically restricted (R) in broiler hens to avoid obesity and improve egg production and livability. To determine whether improved heart health contributes to improved livability, fully adult 45-week-old R hens were allowed to consume feed to appetite (ad libitum; AL) up to 10 wk (70 d). Mortality, contractile functions, and morphology at 70 d, and measurements of cardiac hypertrophic remodeling at 7 d and 21 d were made and compared between R and AL hens. Outcomes for cardiac electrophysiology and mortality, reported separately, found increased mortality in AL hens in association with cardiac pathological hypertrophy and contractile dysfunction...
February 22, 2017: Poultry Science
https://www.readbyqxmd.com/read/28339016/paeonol-ameliorates-imiquimod-induced-psoriasis-like-skin-lesions-in-balb-c-mice-by-inhibiting-the-maturation-and-activation-of-dendritic-cells
#9
Yujiao Meng, Mingxing Wang, Xiangjiang Xie, Tingting Di, Jingxia Zhao, Yan Lin, Xiaolong Xu, Ningfei Li, Yating Zhai, Yan Wang, Ping Li
Paeonol, an active component derived from the traditional Chinese medicine Cortex Moutan, possesses anti-inflammatory, analgesic, antioxidant and anti-allergic properties. Psoriasis is a chronic, recurrent, inflammatory dermatosis accompanied by excessive activation of Toll‑like receptors (TLRs) in dendritic cells (DCs), which are primarily responsible for initiating an immune response. We investigated the effect of paeonol on inflammation in an imiquimod (IMQ)-induced psoriasis-like mouse model and murine bone marrow-derived dendritic cells (BMDCs) stimulated by R848...
March 21, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28333360/gammadelta-t-cells-in-crohn-s-disease-a-new-player-in-the-disease-pathogenesis
#10
Catalan-Serra Ignacio, Arne Kristian Sandvik, Torunn Bruland, Juan Carlos Andreu-Ballester
Crohn's disease (CD) is a chronic relapsing systemic disease affecting the gastrointestinal tract. An altered immune response to commensal intestinal bacteria takes place in genetically predisposed individuals, resulting in chronic inflammation in the gut. Several alterations in the innate immunity mechanisms have been described in recent years. Thus, the study of the immunological aspects of CD, specifically the role of lymphocytes, is a key element for understanding the pathogenesis of the disease. Gammadelta T cells (γδ T cells) constitute only a small proportion of the lymphocytes that circulate in the blood and peripheral organs and they are present mainly in the epithelia, where they can constitute up to 40% of intraepithelial lymphocytes (IEL) in the intestinal mucosa...
March 16, 2017: Journal of Crohn's & Colitis
https://www.readbyqxmd.com/read/28298913/cathepsin-e-deficiency-ameliorates-graft-versus-host-disease-and-modifies-dendritic-cell-motility
#11
Jörg Mengwasser, Liane Babes, Steffen Cordes, Sarah Mertlitz, Katarina Riesner, Yu Shi, Aleixandria McGearey, Martina Kalupa, Thomas Reinheckel, Olaf Penack
Microbial products influence immunity after allogeneic hematopoietic stem cell transplantation (allo-SCT). In this context, the role of cathepsin E (Ctse), an aspartate protease known to cleave bacterial peptides for antigen presentation in dendritic cells (DCs), has not been studied. During experimental acute graft-versus-host disease (GVHD), we found infiltration by Ctse-positive immune cells leading to higher Ctse RNA- and protein levels in target organs. In Ctse-deficient allo-SCT recipients, we found ameliorated GVHD, improved survival, and lower numbers of tissue-infiltrating DCs...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28280496/cd4-ctl-a-cytotoxic-subset-of-cd4-t-cells-their-differentiation-and-function
#12
REVIEW
Arata Takeuchi, Takashi Saito
CD4(+) T cells with cytotoxic activity (CD4 CTL) have been observed in various immune responses. These cells are characterized by their ability to secrete granzyme B and perforin and to kill the target cells in an MHC class II-restricted fashion. Although CD4 CTLs were once thought to be an in vitro artifact associated with long-term culturing, they have since been identified in vivo and shown to play important roles in antiviral and antitumor immunity, as well as in inflammation. Functional characterization of CD4 CTL suggests their potential significance for therapeutic purposes...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28270810/a-novel-model-on-dst-induced-transplantation-tolerance-by-the-transfer-of-self-specific-donor-ttregs-to-a-haplotype-matched-organ-recipient
#13
Angelica Maria Mohr Gregoriussen, Henrik Georg Bohr
Donor-specific blood transfusion (DST) can lead to significant prolongation of allograft survival in experimental animal models and sometimes human recipients of solid organs. The mechanisms responsible for the beneficial effect on graft survival have been a topic of research and debate for decades and are not yet fully elucidated. Once we discover how the details of the mechanisms involved are linked, we could be within reach of a procedure making it possible to establish donor-specific tolerance with minimal or no immunosuppressive medication...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28238951/oral-administration-of-the-nitroxide-radical-tempol-exhibits-immunomodulatory-and-therapeutic-properties-in-multiple-sclerosis-models
#14
Sarah Neil, Jaebong Huh, Victoria Baronas, Xinhui Li, Henry F McFarland, Murali Cherukuri, James B Mitchell, Jacqueline A Quandt
Therapies with both immunomodulatory and neuroprotective properties are thought to have the greatest promise in reducing the severity and progression of multiple sclerosis (MS). Several reactive oxygen (ROS) and reactive nitrogen species (RNS) are implicated in inflammatory-mediated damage to the central nervous system (CNS) in MS and its animal model, experimental autoimmune encephalomyelitis (EAE). TEMPOL (4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl) is a stable nitroxide radical with potent antioxidant activity...
February 24, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28209904/noninvasive-imaging-of-human-immune-responses-in-a-human-xenograft-model-of-graft-versus-host-disease
#15
Catharina H M J Van Elssen, Mohammad Rashidian, Vladimir Vrbanac, Kai W Wucherpfennig, Zeina El Habre, Jana Sticht, Christian Freund, Johanne Jacobsen, Juanjo Cragnolini, Jessica Ingram, Loes Plaisier, Eric Spierings, Andrew M Tager, Hidde Ploegh
The immune system plays a crucial role in many diseases. Activation or suppression of immunity is often related to clinical outcome. Methods to explore the dynamics of immune responses are important to elucidate their role in conditions characterized by inflammation, such as infectious disease, cancer or auto-immunity. Immuno-PET is a non-invasive method by which disease and immune cell infiltration can be explored simultaneously. Using radiolabeled antibodies or fragments derived from them, it is possible to image disease-specific antigens and immune cell subsets...
February 16, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28174562/deletion-of-the-chemokine-binding-protein-gene-from-the-parapoxvirus-orf-virus-reduces-virulence-and-pathogenesis-in-sheep
#16
Stephen B Fleming, Catherine McCaughan, Zabeen Lateef, Amy Dunn, Lyn M Wise, Nicola C Real, Andrew A Mercer
Orf virus (ORFV) is the type species of the Parapoxvirus genus of the family Poxviridae and infects sheep and goats, often around the mouth, resulting in acute pustular skin lesions. ORFV encodes several secreted immunomodulators including a broad-spectrum chemokine binding protein (CBP). Chemokines are a large family of secreted chemotactic proteins that activate and regulate inflammation induced leukocyte recruitment to sites of infection. In this study we investigated the role of CBP in vivo in the context of ORFV infection of sheep...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28128856/experimental-arthritis-in-the-rat-induced-by-the-superantigen-staphylococcal-enterotoxin-a
#17
K Gerlach, C Tomuschat, R Finke, M S Staege, C Brütting, J Brandt, B Jordan, R Schwesig, A Rosemeier, K-S Delank, M E Kornhuber, A Emmer
The pathogenesis of rheumatoid arthritis (RA) is incompletely understood. Human endogenous retroviruses (HERVs) and their superantigenic envelope protein (env) have been implicated in the pathogenesis of RA. In the present investigation, the arthritogenic potential of the superantigen staphylococcal enterotoxin A (SEA) has been investigated. In the present investigation, the bacterial superantigen staphylococcal enterotoxin A (SEA) was injected into the right knee joint of 15 Lewis rats. Further nine animals received saline...
March 2017: Scandinavian Journal of Immunology
https://www.readbyqxmd.com/read/28108636/serelaxin-treatment-promotes-adaptive-hypertrophy-but-does-not-prevent-heart-failure-in-experimental-peripartum-cardiomyopathy
#18
Justus Nonhoff, Melanie Ricke-Hoch, Mirco Mueller, Britta Stapel, Tobias Pfeffer, Martina Kasten, Michaela Scherr, Constantin von Kaisenberg, Johann Bauersachs, Arash Haghikia, Denise Hilfiker-Kleiner
AIMS: Peripartum cardiomyopathy (PPCM) is a systolic left ventricular dysfunction developing in the peripartum phase in previously healthy women. Relaxin-2 is a pregnancy hormone with potential beneficial effects in heart failure patients. We evaluated Relaxin-2 as a potential diagnostic marker and/or a therapeutic agent in PPCM. METHODS AND RESULTS: In healthy peripartum women, serum Relaxin-2 levels (measured by ELISA in the second half of pregnancy) were elevated showing a decreasing trend in the first postpartum week and returned to non-pregnant levels thereafter...
January 20, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28096423/trogocytosis-of-peptide-mhc-class-ii-complexes-from-dendritic-cells-confers-antigen-presenting-ability-on-basophils
#19
Kensuke Miyake, Nozomu Shiozawa, Toshihisa Nagao, Soichiro Yoshikawa, Yoshinori Yamanishi, Hajime Karasuyama
Th2 immunity plays important roles in both protective and allergic responses. Nevertheless, the nature of antigen-presenting cells responsible for Th2 cell differentiation remains ill-defined compared with the nature of the cells responsible for Th1 and Th17 cell differentiation. Basophils have attracted attention as a producer of Th2-inducing cytokine IL-4, whereas their MHC class II (MHC-II) expression and function as antigen-presenting cells are matters of considerable controversy. Here we revisited the MHC-II expression on basophils and explored its functional relevance in Th2 cell differentiation...
January 31, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28094582/effects-of-arsenic-on-porcine-dendritic-cells-in-vitro
#20
Jalil Mehrzad, Mohamad Hosein Mahmudy Gharaie, Masumeh Taheri
Exposure to arsenic (As) is an ongoing, and in some places increasing, health problem. Still, however, the effects of As exposure on the immune system are not well understood. Dendritic cells (DC) are a critical immune cell that bridges the innate and adaptive immune systems. To determine the impact of inorganic (i)As exposure on DC, the effects of (geo)anthropogenically relevant levels of NaAsO2 on the function of porcine monocyte-derived DC (MoDC) were evaluated in an in vitro model. The results showed a low dose of iAs reduced the phagocytic capacity of MoDC...
January 17, 2017: Journal of Immunotoxicology
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