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MHC inflammation

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https://www.readbyqxmd.com/read/28209904/noninvasive-imaging-of-human-immune-responses-in-a-human-xenograft-model-of-graft-versus-host-disease
#1
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
#2
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-sea
#3
Kristina Gerlach, Christian Tomuschat, Rainer Finke, Martin Sebastian Staege, Christine Brütting, Jörg Brandt, Berit Jordan, René Schwesig, Angela Rosemeier, Karl-Stefan Delank, Malte Erich Kornhuber, Alexander 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 9 animals received saline...
January 27, 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
#4
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
#5
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
#6
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
https://www.readbyqxmd.com/read/28088353/expansion-and-differentiation-of-igm-b-cells-in-the-rainbow-trout-peritoneal-cavity-in-response-to-different-antigens
#7
Rosario Castro, Beatriz Abós, Lucia González, Aitor G Granja, Carolina Tafalla
To date, intraperitoneal (i.p.) injection seems to be the most effective vaccination route in aquaculture, as many i.p. administered fish vaccines are capable of conferring strong and long-lasting immune responses. Despite this, how peritoneal leukocytes are regulated upon antigen encounter has only been scarcely studied in fish. Although, in the past, myeloid cells were thought to be the main responders to peritoneal inflammation, a recent study revealed that IgM(+) B cells are one of the main cell types in the teleost peritoneal cavity in response to pathogenic bacteria...
January 11, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28075404/advanced-oxidation-protein-products-modified-albumin-induces-differentiation-of-raw264-7-macrophages-into-dendritic-like-cells-which-is-modulated-by-cell-surface-thiols
#8
Silvano Garibaldi, Chiara Barisione, Barbara Marengo, Pietro Ameri, Claudio Brunelli, Manrico Balbi, Giorgio Ghigliotti
Local accumulation of Advanced Oxidation Protein Products (AOPP) induces pro-inflammatory and pro-fibrotic processes in kidneys and is an independent predictor of renal fibrosis and of rapid decline of eGFR in patients with chronic kidney disease (CKD). In addition to kidney damage, circulating AOPP may be regarded as mediators of systemic oxidative stress and, in this capacity, they might play a role in the progression of atherosclerotic damage of arterial walls. Atherosclerosis is a chronic inflammatory disease that involves activation of innate and adaptive immunity...
January 10, 2017: Toxins
https://www.readbyqxmd.com/read/28066981/disruption-of-transplant-tolerance-by-an-incognito-form-of-cd8-t-cell-dependent-memory
#9
M K Nelsen, K S Beard, R J Plenter, R M Kedl, E T Clambey, R G Gill
Several approaches successfully achieve allograft tolerance in preclinical models but are challenging to translate into clinical practice. Many clinically relevant factors can attenuate allograft tolerance induction including intrinsic genetic resistance, peri-transplant infection, inflammation, and pre-existing anti-donor immunity. The prevailing view for immune memory as a tolerance barrier is that the host harbors memory cells that spontaneously cross-react to donor MHC antigens. Such pre-existing 'heterologous' memory cells have direct reactivity to donor cells and resist most tolerance regimens...
January 9, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28040582/folate-deficiency-affects-dendritic-cell-function-and-subsequent-t-helper-cell-differentiation
#10
Chi-Heng Wu, Tzu-Chien Huang, Bi-Fong Lin
Insufficient folate status may be related to the increasing prevalence of immune- or inflammation-related chronic diseases. To investigate the effects of folate on immune regulation, we examined the impact of folate deficiency (FD) on dendritic cell (DC) maturation and function and, thus, T helper (Th) cells differentiation. First, bone marrow-derived DCs (BMDCs) were generated from BALB/c mice bone marrow cells cultured in folate-containing (F-BMDCs) or folate-deficient (FD-BMDCs) medium. FD-BMDC displayed more immature phenotype including reduced levels of major histocompatibility complex class II (MHC II), co-stimulatory molecules and characteristic of higher endocytic activity...
November 20, 2016: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/27978789/heat-shock-proteins-therapeutic-perspectives-in-inflammatory-disorders
#11
Rekha Khandia, Ashok K Munjal, Hafiz M N Iqbal, Kuldeep Dhama
Heat shock proteins (HSPs) are highly conserved proteins present in all kingdoms of organisms. These are expressed under stress conditions in order to protect the cells from injuries. The stress induced protein denaturation is rectified by refolding and remodelling. These are intracellular proteins but can be present in extracellular fluid like serum of the patients suffering from trauma, autoimmune and inflammatory disorders. Virtually in most inflammatory diseases, immune response towards HSPs is developed...
December 13, 2016: Recent Patents on Inflammation & Allergy Drug Discovery
https://www.readbyqxmd.com/read/27958388/map-kinase-phosphatase-2-deficient-mice-develop-attenuated-experimental-autoimmune-encephalomyelitis-through-regulating-dendritic-cells-and-t-cells
#12
Mark Barbour, Robin Plevin, Hui-Rong Jiang
Mitogen-activated protein kinase phosphatases (MKPs) play key roles in inflammation and immune mediated diseases. Here we investigated the mechanisms by which MKP-2 modulates central nervous system (CNS) inflammation in experimental autoimmune encephalomyelitis (EAE). Our results show that MKP-2 mRNA levels in the spinal cord and lymphoid organs of EAE mice were increased compared with naive controls, indicating an important role for MKP-2 in EAE development. Indeed, MKP-2(-/-) mice developed reduced EAE severity, associated with diminished CNS immune cell infiltration, decreased proinflammatory cytokine production and reduced frequency of CD4(+) and CD8(+) T cells in spleens and lymph nodes...
December 13, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27940660/march1-e3-ubiquitin-ligase-dampens-the-innate-inflammatory-response-by-modulating-monocyte-functions-in-mice
#13
Tristan Galbas, Maxime Raymond, Antoine Sabourin, Marie-Claude Bourgeois-Daigneault, Fanny Guimont-Desrochers, Tae Jin Yun, Jean-François Cailhier, Satoshi Ishido, Sylvie Lesage, Cheolho Cheong, Jacques Thibodeau
Ubiquitination was recently identified as a central process in the pathogenesis and development of numerous inflammatory diseases, such as obesity, atherosclerosis, and asthma. Treatment with proteasomal inhibitors led to severe side effects because ubiquitination is heavily involved in a plethora of cellular functions. Thus, new players regulating ubiquitination processes must be identified to improve therapies for inflammatory diseases. In addition to their role in adaptive immunity, endosomal MHC class II (MHCII) molecules were shown to modulate innate immune responses by fine tuning the TLR4 signaling pathway...
December 9, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27936239/a-broad-spectrum-chemokine-binding-protein-of-bovine-papular-stomatitis-virus-inhibits-neutrophil-and-monocyte-infiltration-in-inflammatory-and-wound-models-of-mouse-skin
#14
Saeed Sharif, Yoshio Nakatani, Lyn Wise, Michael Corbett, Nicola C Real, Gabriella S Stuart, Zabeen Lateef, Kurt Krause, Andrew A Mercer, Stephen B Fleming
Bovine papular stomatitis virus (BPSV) is a Parapoxvirus that induces acute pustular skin lesions in cattle and is transmissible to humans. Previous studies have shown that BPSV encodes a distinctive chemokine-binding protein (CBP). Chemokines are critically involved in the trafficking of immune cells to sites of inflammation and infected tissue, suggesting that the CBP plays a role in immune evasion by preventing immune cells reaching sites of infection. We hypothesised that the BPSV-CBP binds a wide range of inflammatory chemokines particularly those involved in BPSV skin infection, and inhibits the recruitment of immune cells from the blood into inflamed skin...
2016: PloS One
https://www.readbyqxmd.com/read/27915019/the-impact-of-cell-surface-pegylation-and-short-course-immunotherapy-on-islet-graft-survival-in-an-allogeneic-murine-model
#15
Jaime A Giraldo, R Damaris Molano, Hernán R Rengifo, Carmen Fotino, Kerim M Gattás-Asfura, Antonello Pileggi, Cherie L Stabler
: Islet transplantation is a promising therapy for Type 1 diabetes mellitus; however, host inflammatory and immune responses lead to islet dysfunction and destruction, despite potent systemic immunosuppression. Grafting of poly(ethylene glycol) (PEG) to the periphery of cells or tissues can mitigate inflammation and immune recognition via generation of a steric barrier. Herein, we sought to evaluate the complementary impact of islet PEGylation with a short-course immunotherapy on the survival of fully-MHC mismatched islet allografts (DBA/2 islets into diabetic C57BL/6J recipients)...
February 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/27908893/tracking-monocyte-recruitment-and-macrophage-accumulation-in-atherosclerotic-plaque-progression-using-a-novel-hcd68gfp-apoe-reporter-mouse-brief-report
#16
Eileen McNeill, Asif J Iqbal, Daniel Jones, Jyoti Patel, Patricia Coutinho, Lewis Taylor, David R Greaves, Keith M Channon
OBJECTIVE: To create a model of atherosclerosis using green fluorescent protein (GFP)-targeted monocytes/macrophages, allowing analysis of both endogenous GFP(+) and adoptively transferred GFP(+) myeloid cells in arterial inflammation. APPROACH AND RESULTS: hCD68GFP reporter mice were crossed with ApoE(-/-) mice. Expression of GFP was localized to macrophages in atherosclerotic plaques and in angiotensin II-induced aortic aneurysms and correlated with galectin 3 and mCD68 expression. Flow cytometry confirmed GFP(+) expression in CD11b(+)/CD64(+), CD11c(+)/MHC-II(HI), and CD11b(+)/F4/80(+) myeloid cells...
February 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/27907087/prenylated-polyphenols-from-clusiaceae-and-calophyllaceae-with-immunomodulatory-activity-on-endothelial-cells
#17
Caroline Rouger, Sylvain Pagie, Séverine Derbré, Anne-Marie Le Ray, Pascal Richomme, Béatrice Charreau
Endothelial cells (ECs) are key players in inflammation and immune responses involved in numerous pathologies. Although attempts were experimentally undertaken to prevent and control EC activation, drug leads and probes still remain necessary. Natural products (NPs) from Clusiaceous and Calophyllaceous plants were previously reported as potential candidates to prevent endothelial dysfunction. The present study aimed to identify more precisely the molecular scaffolds that could limit EC activation. Here, 13 polyphenols belonging to 5 different chemical types of secondary metabolites (i...
2016: PloS One
https://www.readbyqxmd.com/read/27861817/a-novel-spontaneous-mutation-in-the-tap2-gene-unravels-its-role-in-macrophage-survival
#18
Antonio Lapenna, Ibrahim Omar, Michael Berger
We report a new mouse strain with a single point mutation in the type 2 transporter associated with antigen processing (TAP2). This strain randomly arose in one of our C57BL/6J mouse colonies and was initially discovered because of the lack of CD8(+) T cells in the periphery. Following our observation, we subsequently revealed a lack of cell surface MHC-I expression, derived from TAP2 protein deficiency. Our strain, named eightless, has a C to T substitution in exon 5 resulting in a glutamine to stop codon substitution at position 285 in the TAP2 protein...
November 18, 2016: Immunology
https://www.readbyqxmd.com/read/27837111/age-associated-b-cells-with-proinflammatory-characteristics-are-expanded-in-a-proportion-of-multiple-sclerosis-patients
#19
Nele Claes, Judith Fraussen, Marjan Vanheusden, Niels Hellings, Piet Stinissen, Bart Van Wijmeersch, Raymond Hupperts, Veerle Somers
Immune aging occurs in the elderly and in autoimmune diseases. Recently, IgD(-)CD27(-) (double negative, DN) and CD21(-)CD11c(+) (CD21(low)) B cells were described as age-associated B cells with proinflammatory characteristics. This study investigated the prevalence and functional characteristics of DN and CD21(low) B cells in multiple sclerosis (MS) patients. Using flow cytometry, we demonstrated a higher proportion of MS patients younger than 60 y with peripheral expansions of DN (8/41) and CD21(low) (9/41) B cells compared with age-matched healthy donors (1/33 and 2/33, respectively), which indicates an increase in age-associated B cells in MS patients...
December 15, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27816788/tlr4-hmgb1-signaling-pathway-affects-the-inflammatory-reaction-of-autoimmune-myositis-by-regulating-mhc-i
#20
Zemin Wan, Xiujuan Zhang, Anping Peng, Min He, Zhenhua Lei, Yunxiu Wang
OBJECTIVES: To analyze the effects of TLR4 on the expression of the HMGB1, MHC-I and downstream cytokines IL-6 and TNF-α, and to investigate the biological role of the TLR4-HMGB1 signaling pathway in the development of the autoimmune myositis. METHODS: We built mice models with experimental autoimmune myositis (EAM) and used the inverted screen experiment to measure their muscle endurance; we also examined inflammatory infiltration of muscle tissues after HE staining; and we assessed the expression of MHC-I using immunohistochemistry...
December 2016: International Immunopharmacology
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