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https://www.readbyqxmd.com/read/28719212/proteochemometrics-based-prediction-of-peptide-binding-to-hla-dp-proteins
#1
Ventsislav Yordanov, Ivan Dimitrov, Irini Doytchinova
Human leukocyte antigens (HLA) class II proteins are involved in the antigen processing in the antigen presenting cells. They form complexes with antigen peptide fragments. The peptide-HLA protein complexes are presented on the cell surface where they are recognized by helper T cells (Th cells). HLA-DP is one of the three HLA class II loci. The HLA-DP proteins are associated with a significant number of autoimmune diseases, as well as with a susceptibility or resistance to a number of infectious agents. In the present study, we apply proteochemometrics - a method for bioactivity modeling of multiple ligands binding to multiple target proteins - to derive and validate a robust model for peptide binding prediction to 7 most frequent HLA-DP proteins...
July 18, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28718997/mesenchymal-stem-cell-derived-factors-immuno-modulatory-effects-and-therapeutic-potential
#2
REVIEW
Vladislav Volarevic, Marina Gazdic, Bojana Simovic Markovic, Nemanja Jovicic, Valentin Djonov, Nebojsa Arsenijevic
Stem cell-based therapy is considered to be a new hope in transplantation medicine. Among stem cells, mesenchymal stem cells (MSCs) are, due to their differentiation and immuno-modulatory characteristics, the most commonly used as therapeutic agents in the treatment of immune-mediated diseases. MSCs migrate to the site of inflammation and modulate immune response. The capacity of MSC to alter phenotype and function of immune cells are largely due to the production of soluble factors which expression varies depending on the pathologic condition to which MSCs are exposed...
July 18, 2017: BioFactors
https://www.readbyqxmd.com/read/28718002/infectious-pathogens-may-trigger-specific-allo-hla-reactivity-via-multiple-mechanisms
#3
REVIEW
Lloyd D'Orsogna, Heleen van den Heuvel, Cees van Kooten, Sebastiaan Heidt, Frans H J Claas
Transplant recipients can be sensitized against allo-HLA antigens by previous transplantation, blood transfusion, or pregnancy. While there is growing awareness that multiple components of the immune system can act as effectors of the alloresponse, the role of infectious pathogen exposure in triggering sensitization and allograft rejection has remained a matter of much debate. Here, we describe that exposure to pathogens may enhance the immune response to allogeneic HLA antigens via different pathways. The potential role of allo-HLA cross-reactivity of virus-specific memory T cells, activation of innate immunity leading to a more efficient induction of the adaptive alloimmune response by antigen-presenting cells, and bystander activation of existing memory B cell activation will be discussed in this review...
July 17, 2017: Immunogenetics
https://www.readbyqxmd.com/read/28717140/common-variants-of-t-cells-contribute-differently-to-phenotypic-variation-in-sarcoidosis
#4
Natalia V Rivera, Michael Hagemann-Jensen, Manuel A R Ferreira, Susanna Kullberg, Anders Eklund, Nicholas G Martin, Leonid Padyukov, Johan Grunewald
The involvement of the immune system, particularly the role of T-cells, in sarcoidosis is unclear. The existence of higher CD4+ T-cells and increased CD4/CD8 ratio may indicate a pathogenic role of T-cells in the disease. In this study, we quantified the contribution of T-cells associated variants and of CD4/CD8 ratio in sarcoidosis phenotypes, Löfgren's syndrome (LS) and non- Löfgren's syndrome (non-LS). We employed a polygenic-based approach using genome-wide association studies results on relative levels of T-cells in healthy individuals to measure the genetic contribution of T-cells in sarcoidosis entities...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28716903/autophagy-related-protein-vps34-controls-the-homeostasis-and-function-of-antigen-cross-presenting-cd8%C3%AE-dendritic-cells
#5
Vrajesh V Parekh, Sudheer K Pabbisetty, Lan Wu, Eric Sebzda, Jennifer Martinez, Jianhua Zhang, Luc Van Kaer
The class III PI3K Vacuolar protein sorting 34 (Vps34) plays a role in both canonical and noncanonical autophagy, key processes that control the presentation of antigens by dendritic cells (DCs) to naive T lymphocytes. We generated DC-specific Vps34-deficient mice to assess the contribution of Vps34 to DC functions. We found that DCs from these animals have a partially activated phenotype, spontaneously produce cytokines, and exhibit enhanced activity of the classic MHC class I and class II antigen-presentation pathways...
July 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28716863/opposing-regulation-and-roles-for-phd3-in-lung-dendritic-cells-and-alveolar-macrophages
#6
Simon J Tavernier, Nele Vanlangenakker, Jessica Vetters, Peter Carmeliet, Sophie Janssens, Bart N Lambrecht
The prolyl hydroxylase domain-containing enzymes (PHDs) are important metabolic sensors of the cell and its environment, which might be employed to alert cells of the immune system. These enzymes regulate the expression of the hypoxia inducible factor (HIF) isoforms and NF-κB, crucial transcription factors controlling cellular metabolism and inflammation. PHD/HIF signaling is activated in the allergic lung and is proposed as a potential druggable pathway. Here, we investigated the regulation and role of the PHD isoforms in CD11c-expressing dendritic cells (DCs) and macrophages (Mϕ), sensors of the environment and crucial antigen-presenting cells in the pathogenesis of asthma...
July 17, 2017: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/28716211/to-serve-and-protect-the-modulatory-role-of-von-willebrand-factor-on-factor-viii-immunogenicity
#7
REVIEW
Robin B Hartholt, Alice S van Velzen, Ivan Peyron, Anja Ten Brinke, Karin Fijnvandraat, Jan Voorberg
Hemophilia A is a bleeding disorder characterized by the absence or dysfunction of blood coagulation factor VIII (FVIII). Patients are treated with regular infusions of FVIII concentrate. In response to treatment, approximately 30% of patients with severe hemophilia A develop inhibitory antibodies targeting FVIII. Both patient and treatment related risk factors for inhibitor development have been described. Multiple studies comparing the immunogenicity of recombinant and plasma-derived FVIII have yielded conflicting results...
July 4, 2017: Blood Reviews
https://www.readbyqxmd.com/read/28715682/cath-2-and-ll-37-increase-mannose-receptor-expression-antigen-presentation-and-the-endocytic-capacity-of-chicken-mononuclear-phagocytes
#8
Marina D Kraaij, Albert van Dijk, Henk P Haagsman
Cathelicidins display in vitro and in vivo immunomodulatory activities and are part of the innate immune system. Previously, we found that in ovo treatment with chicken cathelicidin CATH-2 partially protects young broilers against respiratory E. coli infection. To determine the cellular aspects of this protection, we investigated immunomodulatory effects of CATH-2 and the human cathelicidin LL-37 on primary chicken peripheral blood mononuclear cells (PBMCs). Treatment of chicken PBMCs with L-CATH-2, D-CATH-2 or LL-37 increased the percentage of mononuclear phagocytes, but decreased that of B cells...
July 14, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28715352/commensal-bacterial-modulation-of-the-host-immune-response-to-ameliorate-pain-in-a-murine-model-of-chronic-prostatitis
#9
Stephen F Murphy, Anthony J Schaeffer, Joseph D Done, Marsha L Quick, Utkucan Acar, Praveen Thumbikat
The human commensal microflora plays an essential role in modulating the immune response to control homeostasis. Staphylococcus epidermidis, a commensal bacterium most commonly associated with the skin exerts such effects locally, modulating local immune responses during inflammation and preventing superinfection by pathogens such as Staphylococcus aureus. Although the prostate is considered by many to be sterile, multiple investigations have shown that small numbers of gram-positive bacterial species such as S...
August 2017: Pain
https://www.readbyqxmd.com/read/28714847/modulation-of-the-transcription-factor-nf-%C3%AE%C2%BAb-in-antigen-presenting-cells-by-bovine-respiratory-syncytial-virus-small-hydrophobic-protein
#10
Nicola Pollock, Geraldine Taylor, Fatoumatta Jobe, Efrain Guzman
Bovine respiratory syncytial virus (BRSV) is an important cause of respiratory disease in young cattle and is closely related to human RSV (HRSV), which causes severe respiratory disease in infants and the elderly. The RSV genome encodes a small hydrophobic (SH) protein with viroporin activity. Previous studies have shown that recombinant BRSV lacking the SH gene (rBRSVΔSH) is attenuated in the lungs, but not in the upper respiratory tract, of calves and mucosal vaccination with rBRSVΔSH induced long-lasting protective immunity...
July 17, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28713387/human-cd6-down-modulation-following-t-cell-activation-compromises-lymphocyte-survival-and-proliferative-responses
#11
Esther Carrasco, Cristina Escoda-Ferran, Núria Climent, Cristina Miró-Julià, Inês T Simões, Mario Martínez-Florensa, Adelaida Sarukhan, Esther Carreras, Francisco Lozano
Available evidence indicates that the CD6 lymphocyte surface receptor is involved in T-cell developmental and activation processes, by facilitating cell-to-cell adhesive contacts with antigen-presenting cells and likely modulating T-cell receptor (TCR) signaling. Here, we show that in vitro activation of human T cells under different TCR-ligation conditions leads to surface downregulation of CD6 expression. This phenomenon was (i) concomitant to increased levels of soluble CD6 (sCD6) in culture supernatants, (ii) partially reverted by protease inhibitors, (iii) not associated to CD6 mRNA down-regulation, and (iv) reversible by stimulus removal...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28713364/immunomodulatory-activities-of-a-fungal-protein-extracted-from-hericium-erinaceus-through-regulating-the-gut-microbiota
#12
Chen Diling, Zheng Chaoqun, Yang Jian, Li Jian, Su Jiyan, Xie Yizhen, Lai Guoxiao
A single-band protein (HEP3) was isolated from Hericium erinaceus using a chemical separation combined with pharmacodynamic evaluation methods. This protein exhibited immunomodulatory activity in lipopolysaccharide-activated RAW 264.7 macrophages by decreasing the overproduction of tumor necrosis factor-α, interleukin (IL)-1β, and IL-6, and downregulating the expression of inducible nitric oxide synthase and nuclear factor-κB p65. Further researches revealed that HEP3 could improve the immune system via regulating the composition and metabolism of gut microbiota to activate the proliferation and differentiation of T cells, stimulate the intestinal antigen-presenting cells in high-dose cyclophosphamide-induced immunotoxicity in mice, and play a prebiotic role in the case of excessive antibiotics in inflammatory bowel disease model mice...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28713239/increased-white-matter-inflammation-in-aging-and-alzheimer-s-disease-brain
#13
Divya Raj, Zhuoran Yin, Marjolein Breur, Janine Doorduin, Inge R Holtman, Marta Olah, Ietje J Mantingh-Otter, Debby Van Dam, Peter P De Deyn, Wilfred den Dunnen, Bart J L Eggen, Sandra Amor, Erik Boddeke
Chronic neuroinflammation, which is primarily mediated by microglia, plays an essential role in aging and neurodegeneration. It is still unclear whether this microglia-induced neuroinflammation occurs globally or is confined to distinct brain regions. In this study, we investigated microglia activity in various brain regions upon healthy aging and Alzheimer's disease (AD)-related pathology in both human and mouse samples. In purified microglia isolated from aging mouse brains, we found a profound gene expression pattern related to pro-inflammatory processes, phagocytosis, and lipid homeostasis...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28712489/plant-made-virus-like-particles-bearing-influenza-hemagglutinin-ha-recapitulate-early-interactions-of-native-influenza-virions-with-human-monocytes-macrophages
#14
Alexander I Makarkov, Sabrina Chierzi, Stéphane Pillet, Keith K Murai, Nathalie Landry, Brian J Ward
INTRODUCTION: Plant-made virus-like particles (VLP) bearing influenza virus hemagglutinins (HA) are novel vaccine candidates that induce cross-reactive humoral and poly-functional T cell responses. To better understand the mechanisms that underlie this broad immunogenicity we studied early interactions of VLPs bearing either H1 (A/California/07/2009 (H1N1)) or H5 (A/Indonesia/05/2005 (H5N1)) with a human monocytoid cell line (U-937 cells) and human monocyte-derived macrophages (MDMs) as model antigen-presenting cells (APC)...
July 13, 2017: Vaccine
https://www.readbyqxmd.com/read/28711300/raft-dependent-endocytic-movement-and-intracellular-cluster-formation-during-t%C3%A2-cell-activation-triggered-by-concanavalin-a
#15
Satomi Yabuuchi, Satoshi Endo, KeangOk Baek, Kunihide Hoshino, Yoshio Tsujino, Mun'delanji C Vestergaard, Masahiro Takagi
Certain food ingredients can stimulate the human immune system. A lectin, concanavalin A (ConA), from Canavalia ensiformis (jack bean) is one of the most well-known food-derived immunostimulants and mediates activation of cell-mediated immunity through T cell proliferation. Generally, T cell activation is known to be triggered by the interaction between T cells and antigen-presenting cells (APCs) via a juxtacrine (contact-dependent) signaling pathway. The mechanism has been well characterized and is referred to as formation of the immunological synapse (IS)...
July 12, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28710013/murine-bone-marrow-derived-dcs-activated-by-porcine-rotavirus-stimulate-the-th1-subtype-response-in%C3%A2-vitro
#16
Liping Ye, Yanlong Jiang, Guilian Yang, Wentao Yang, Jingtao Hu, Yulin Cui, Chunwei Shi, Jing Liu, Chunfeng Wang
Rotavirus (RV) infection causes acute, watery dehydrating diarrhea and even death in infants and other young animals, resulting in a severe economic burden; however, little is known about the innate immune mechanisms associated with RV infection. Dendritic cells (DCs), which are professional antigen-presenting cells (APCs), serve as a bridge connecting the innate and adaptive immune system. In this study, the interaction between murine bone marrow-derived DCs (BMDCs) and porcine rotavirus (PRV) was investigated in vitro...
July 12, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28708104/fruit-and-juice-epigenetic-signatures-are-associated-with-independent-immunoregulatory-pathways
#17
Jessie Nicodemus-Johnson, Robert A Sinnott
Epidemiological evidence strongly suggests that fruit consumption promotes many health benefits. Despite the general consensus that fruit and juice are nutritionally similar, epidemiological results for juice consumption are conflicting. Our objective was to use DNA methylation marks to characterize fruit and juice epigenetic signatures within PBMCs and identify shared and independent signatures associated with these groups. Genome-wide DNA methylation marks (Illumina Human Methylation 450k chip) for 2,148 individuals that participated in the Framingham Offspring exam 8 were analyzed for correlations between fruit or juice consumption using standard linear regression...
July 14, 2017: Nutrients
https://www.readbyqxmd.com/read/28707750/arterial-immune-protein-expression-demonstrates-the-complexity-of-immune-responses-in-kawasaki-disease-arteritis
#18
Scott A Cameron, Steven M White, David Arrollo, Stanford T Shulman, Anne H Rowley
BACKGROUND: A more complete understanding of immune-mediated damage to the coronary arteries in children with Kawasaki disease (KD) is required for improvements in patient treatment and outcomes. We recently reported the transcriptional profile of KD coronary arteritis, and here sought to determine protein expression of transcriptionally upregulated immune genes in KD coronary arteries from the first two months after disease onset. METHODS: We examined the coronary arteries of 12 fatal KD cases and 13 childhood controls for expression of a set of proteins whose genes were highly upregulated in the KD coronary artery transcriptome: allograft inflammatory factor 1 (AIF1), interleukin 18 (IL-18), CD74, CD1c, CD20 (MS4A1), Toll-like receptor 7 (TLR7), and Z-DNA binding protein 1 (ZBP1)...
July 14, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28707331/epstein-barr-virus-lytic-cycle-involvement-in-diffuse-large-b-cell-lymphoma
#19
Melina Cohen, Aldana Georgina Vistarop, Fuad Huaman, Marina Narbaitz, Fernanda Metrebian, Elena De Matteo, María Victoria Preciado, Paola Andrea Chabay
Epstein-Barr virus (EBV)-mediated B cell transformation is achieved predominantly through the action of latent proteins, but recent evidence suggests that lytic EBV replication has also a certain pathogenic role in lymphomagenesis, at least in the early phases of cell transformation. Particularly, in diffuse large B cell lymphoma (DLBCL), the EBV lytic cycle is by and large unexplored, so to disclose lytic cell contribution to lymphomagenesis, our aim was to evaluate viral early and late lytic gene expression in relation to several immune response markers in a series of EBV+ DLBCL from Argentina...
July 14, 2017: Hematological Oncology
https://www.readbyqxmd.com/read/28706421/gastric-cancer-derived-heat-shock-protein-gp96-peptide-complex-enhances-dendritic-cell-activation
#20
Wen-Wen Lu, Hong Zhang, You-Ming Li, Feng Ji
AIM: To investigate the role of heat shock protein (HSP)-glycoprotein (gp)96 in dendritic cells (DCs) and lymphocytes induction in gastric cancer (GC). METHODS: Human GC cell lines KATOIII, MKN-28 and SGC-7901 were infected with adenovirus gp96 at a multiplicity of infection of 100. gp96-GC antigen peptide complexes were purified. MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay, lactate dehydrogenase (LDH) release assay and enzyme-linked immunosorbent assay were used to determine allo-reactive T cell stimulation, natural killer (NK) cell activity and expression of cytokines (such as interleukin (IL)-10, IL-12, interferon (IFN)-γ and tumor necrosis factor (TNF)-α), respectively...
June 28, 2017: World Journal of Gastroenterology: WJG
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