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https://www.readbyqxmd.com/read/27902915/characterization-of-chicken-splenic-derived-dendritic-cells-following-vaccine-and-very-virulent-strains-of-infectious-bursal-disease-virus-infection
#1
A R Yasmin, S K Yeap, M Hair-Bejo, A R Omar
Studies have shown that infectious bursal disease virus (IBDV) infects lymphoid cells, mainly B cells and macrophages. This study was aimed to examine the involvement of chicken splenic-derived dendritic cells (ch-sDCs) in specific-pathogen-free chickens following inoculation with IBDV vaccine strain (D78) and a very virulent (vv) strain (UPM0081). Following IBDV infection, enriched activated ch-sDCs were collected by using the negative selection method and were examined based on morphology and immunophenotyping to confirm the isolation method for dendritic cells (DCs)...
December 2016: Avian Diseases
https://www.readbyqxmd.com/read/27892478/continuous-single-cell-imaging-reveals-sequential-steps-of-plasmacytoid-dendritic-cell-development-from-common-dendritic-cell-progenitors
#2
Ezgi Dursun, Max Endele, Andrea Musumeci, Henrik Failmezger, Shu-Hung Wang, Achim Tresch, Timm Schroeder, Anne B Krug
Functionally distinct plasmacytoid and conventional dendritic cells (pDC and cDC) shape innate and adaptive immunity. They are derived from common dendritic cell progenitors (CDPs) in the murine bone marrow, which give rise to CD11c(+) MHCII(-) precursors with early commitment to DC subpopulations. In this study, we dissect pDC development from CDP into an ordered sequence of differentiation events by monitoring the expression of CD11c, MHC class II, Siglec H and CCR9 in CDP cultures by continuous single cell imaging and tracking...
November 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27888357/aberrant-cytoplasmic-expression-of-mhcii-confers-worse-progression-free-survival-in-diffuse-large-b-cell-lymphoma
#3
Samantha Kendrick, Lisa M Rimsza, David W Scott, Graham W Slack, Pedro Farinha, King L Tan, Daniel Persky, Soham Puvvada, Joseph M Connors, Laurie Sehn, Randy D Gascoyne, Monika Schmelz
No abstract text is available yet for this article.
November 25, 2016: Virchows Archiv: An International Journal of Pathology
https://www.readbyqxmd.com/read/27863543/reduced-humoral-immunity-and-atypical-cell-mediated-immunity-in-response-to-vaccination-in-cows-naturally-infected-with-bovine-leukemia-virus
#4
Meredith C Frie, Kelly R Sporer, Joseph C Wallace, Roger K Maes, Lorraine M Sordillo, Paul C Bartlett, Paul M Coussens
Bovine leukemia virus (BLV) is a retrovirus that is widely distributed across US dairy herds: over 83% of herds are BLV-infected and within-herd infection rates can approach 50%. BLV infection reduces both animal longevity and milk production and can interfere with normal immune health. With such a high prevalence of BLV infection in dairy herds, it is essential to understand the circumstances by which BLV negatively affects the immune system of infected cattle. To address this question, BLV- and BLV+ adult, lactating Holstein dairy cows were vaccinated with Bovi-Shield GOLD(®) FP(®) 5 L5 HB and their immune response to vaccination was measured over the course of 28days...
December 2016: Veterinary Immunology and Immunopathology
https://www.readbyqxmd.com/read/27862351/p2y12-receptor-is-expressed-on-human-microglia-under-physiological-conditions-throughout-development-and-is-sensitive-to-neuroinflammatory-diseases
#5
Alexander Mildner, Hao Huang, Josefine Radke, Werner Stenzel, Josef Priller
Microglia are resident immune cells in the central nervous system (CNS), which are essential for immune defence and critically contribute to neuronal functions during homeostasis. Until now, little is known about microglia biology in humans in part due to the lack of microglia-specific markers. We therefore investigated the expression of the purinergic receptor P2Y12 in human brain tissue. Compared to classical markers used to identify microglia such as Iba1, CD68 or MHCII, we found that P2Y12 is expressed on parenchymal microglia but is absent from perivascular or meningeal macrophages...
November 12, 2016: Glia
https://www.readbyqxmd.com/read/27861808/peptidomic-analysis-of-type-1-diabetes-associated-hla-dq-molecules-and-the-impact-of-hla-dm-on-peptide-repertoire-editing
#6
Zemin Zhou, Eduardo Reyes-Vargas, Hernando Escobar, Kuan Y Chang, Adam P Barker, Alan L Rockwood, Julio C Delgado, Xiao He, Peter E Jensen
HLA-DM and class II associated invariant chain (Ii) are key cofactors in the MHC class II (MHCII) antigen processing pathway. We used tandem mass spectrometry sequencing to directly interrogate the global impact of DM and Ii on the repertoire of MHCII-bound peptides in human embryonic kidney 293T cells expressing HLA-DQ molecules in the absence or presence of these cofactors. Ii and DM have a major impact on the repertoire of peptides presented by DQ1 and DQ6, with the caveat that this technology is not quantitative...
November 15, 2016: European Journal of Immunology
https://www.readbyqxmd.com/read/27861512/a-rapid-response-humoral-vaccine-platform-exploiting-pre-existing-non-cognate-populations-of-anti-vaccine-or-anti-viral-cd4-t-helper-cells-to-confirm-b-cell-activation
#7
Thomas Hills, Phillip G Jakeman, Robert C Carlisle, Paul Klenerman, Leonard W Seymour, Ryan Cawood
The need for CD4+ T cell responses to arise de novo following vaccination can limit the speed of B cell responses. Populations of pre-existing vaccine-induced or anti-viral CD4+ T cells recognising distinct antigens could be exploited to overcome this limitation. We hypothesise that liposomal vaccine particles encapsulating epitopes that are recognised, after processing and B cell MHCII presentation, by pre-existing CD4+ T cells will exploit this pre-existing T cell help and result in improved antibody responses to distinct target antigens displayed on the particle surface...
2016: PloS One
https://www.readbyqxmd.com/read/27842458/suppression-of-canine-dendritic-cell-activation-maturation-and-inflammatory-cytokine-release-by-mesenchymal-stem-cells-occurs-via-multiple-distinct-biochemical-pathways
#8
William Henry Wheat, Lyndah Chow, Jade N Kurihara, Daniel P Regan, Jonathan W Coy, Tracy L Webb, Steven W Dow
Mesenchymal stem cells (MSC) represent a readily accessible source of cells with potent immune modulatory activity. MSC can suppress ongoing inflammatory responses by suppressing T cell function, while fewer studies have examined the impact of MSC on dendritic cell function. The dog spontaneous disease model represents an important animal model with which to evaluate the safety and effectiveness of cellular therapy with MSC. This study evaluated the effects of canine MSC on the activation and maturation of canine monocyte-derived dendritic cells (DC), as well as mechanisms underlying these effects...
November 14, 2016: Stem Cells and Development
https://www.readbyqxmd.com/read/27832589/the-salmonella-effector-sted-mediates-march8-dependent-ubiquitination-of-mhc-ii-molecules-and-inhibits-t-cell-activation
#9
Ethel Bayer-Santos, Charlotte H Durkin, Luciano A Rigano, Andreas Kupz, Eric Alix, Ondrej Cerny, Elliott Jennings, Mei Liu, Aindrias S Ryan, Nicolas Lapaque, Stefan H E Kaufmann, David W Holden
The SPI-2 type III secretion system (T3SS) of intracellular Salmonella enterica translocates effector proteins into mammalian cells. Infection of antigen-presenting cells results in SPI-2 T3SS-dependent ubiquitination and reduction of surface-localized mature MHC class II (mMHCII). We identify the effector SteD as required and sufficient for this process. In Mel Juso cells, SteD localized to the Golgi network and vesicles containing the E3 ubiquitin ligase MARCH8 and mMHCII. SteD caused MARCH8-dependent ubiquitination and depletion of surface mMHCII...
November 9, 2016: Cell Host & Microbe
https://www.readbyqxmd.com/read/27827392/mhc-class-ii-complexes-sample-intermediate-states-along-the-peptide-exchange-pathway
#10
Marek Wieczorek, Jana Sticht, Sebastian Stolzenberg, Sebastian Günther, Christoph Wehmeyer, Zeina El Habre, Miguel Álvaro-Benito, Frank Noé, Christian Freund
The presentation of peptide-MHCII complexes (pMHCIIs) for surveillance by T cells is a well-known immunological concept in vertebrates, yet the conformational dynamics of antigen exchange remain elusive. By combining NMR-detected H/D exchange with Markov modelling analysis of an aggregate of 275 microseconds molecular dynamics simulations, we reveal that a stable pMHCII spontaneously samples intermediate conformations relevant for peptide exchange. More specifically, we observe two major peptide exchange pathways: the kinetic stability of a pMHCII's ground state defines its propensity for intrinsic peptide exchange, while the population of a rare, intermediate conformation correlates with the propensity of the HLA-DM-catalysed pathway...
November 9, 2016: Nature Communications
https://www.readbyqxmd.com/read/27821668/generation-of-immunity-against-pathogens-via-single-domain-antibody-antigen-constructs
#11
Joao N Duarte, Juan J Cragnolini, Lee Kim Swee, Angelina M Bilate, Justin Bader, Jessica R Ingram, Ali Rashidfarrokhi, Tao Fang, Ariën Schiepers, Leo Hanke, Hidde L Ploegh
mAbs specific for surface proteins on APCs can serve as Ag-delivery vehicles that enhance immunogenicity. The practical use of such constructs is limited by the challenge of expressing and modifying full-sized mAbs. We generated single-domain Ab fragments (VHHs) specific for class II MHC (MHCII), CD11b, and CD36. VHH sequences were modified by inclusion of a C-terminal sortase motif to allow site-specific conjugation with various Ag payloads. We tested T cell activation using VHHs that target distinct APC populations; anti-MHCII adducts elicited strong activation of CD4(+) T cells, whereas anti-CD11b showed CD8(+) T cell activation superior to targeting via MHCII and CD36...
November 7, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27815198/comparative-immunity-of-salmo-salar-and-oncorhynchus-kisutch-during-infestation-with-the-sea-louse-caligus-rogercresseyi-an-enrichment-transcriptome-analysis
#12
Valentina Valenzuela-Muñoz, Sebastian Boltaña, Cristian Gallardo-Escárate
Caligus rogercresseyi, an ectoparasite affecting the Chilean salmon industry, can cause immunosuppression and physiological stress in farmed fish. Interestingly, coho salmon (Oncorhynchus kisutch) are notably resistant to infestation, whereas Atlantic salmon (Salmo salar) are phenotypically more susceptible to sea lice. However, comparative studies on immune responses to C. rogercresseyi have not been conducted. In this study, Illumina sequencing was conducted to evaluate head kidney and skin samples taken 7 and 14 days post-infestation, yielding a total of 1492 and 1522 contigs annotated to immune-related genes for Atlantic and coho salmon, respectively...
December 2016: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/27809931/trichinella-spiralis-paramyosin-activates-mouse-bone-marrow-derived-dendritic-cells-and-induces-regulatory-t-cells
#13
Kai Guo, Ximeng Sun, Yuan Gu, Zixia Wang, Jingjing Huang, Xinping Zhu
BACKGROUND: Dendritic cells (DCs) are antigen-presenting cells that regulate T cell responses for many infectious diseases. The tissue-dwelling nematode Trichinella spiralis expresses paramyosin (TsPmy) not only as a structural protein but also as an immunomodulator to alleviate complement attack by binding to some host complement components. Whether TsPmy is involved in other immunomodulatory pathway and how TsPmy interacts with host DCs is still unknown. METHODS: Mouse bone marrow-derived DCs were incubated with recombinant TsPmy (rTsPmy) for activation...
November 4, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27808089/splenic-differentiation-and-emergence-of-ccr5-cxcl9-cxcl10-monocyte-derived-dendritic-cells-in-the-brain-during-cerebral-malaria
#14
Isabella C Hirako, Marco A Ataide, Lucas Faustino, Patricia A Assis, Elizabeth W Sorensen, Hisashi Ueta, Natalia M Araújo, Gustavo B Menezes, Andrew D Luster, Ricardo T Gazzinelli
Dendritic cells have an important role in immune surveillance. After being exposed to microbial components, they migrate to secondary lymphoid organs and activate T lymphocytes. Here we show that during mouse malaria, splenic inflammatory monocytes differentiate into monocyte-derived dendritic cells (MO-DCs), which are CD11b(+)F4/80(+)CD11c(+)MHCII(high)DC-SIGN(high)Ly6c(+) and express high levels of CCR5, CXCL9 and CXCL10 (CCR5(+)CXCL9/10(+) MO-DCs). We propose that malaria-induced splenic MO-DCs take a reverse migratory route...
November 3, 2016: Nature Communications
https://www.readbyqxmd.com/read/27801552/th17-responses-to-col-v-k%C3%AE-1-tubulin-and-vimentin-are-present-early-in-human-development-and-persist-lifelong
#15
Jeremy A Sullivan, Ewa Jankowska-Gan, Subramanya Hegde, Matthew A Pestrak, Vrushali V Agashe, Arick C Park, Matthew E Brown, John F Kernien, David S Wilkes, Dixon B Kaufman, Daniel S Greenspan, William J Burlingham
Th17-dependent autoimmune responses can develop after heart or lung transplantation, and are associated with fibro-obliterative forms of chronic rejection. However, the specific self-antigens involved are typically different from those associated with autoimmune disease. To investigate the basis of these responses, we questioned whether removal of Tregs or blockade of function reveals a similar auto-antigen bias. We found that Th17 cells specific for collagen type V (Col V), kα-1-tubulin, and vimentin were present in healthy, adult PBMC, cord blood, and fetal thymus...
November 1, 2016: American Journal of Transplantation
https://www.readbyqxmd.com/read/27797950/successive-losses-of-central-immune-genes-characterize-the-gadiformes-alternate-immunity
#16
Monica H Solbakken, Matthew L Rise, Kjetill S Jakobsen, Sissel Jentoft
Great genetic variability among teleost immunomes, with gene losses and expansions of central adaptive and innate components, has been discovered through genome sequencing over the last few years. Here, we demonstrate that the innate Myxovirus resistance gene (Mx) is lost from the ancestor of Gadiformes and the closely related Stylephorus chordatus, thus predating the loss of Major Histocompatibility Complex class II (MHCII) in Gadiformes. Although the functional implication of Mx loss is still unknown, we demonstrate that this loss is one of several ancient events appearing in successive order throughout the evolution of teleost immunity...
October 19, 2016: Genome Biology and Evolution
https://www.readbyqxmd.com/read/27793335/role-of-heterogeneous-cell-population-on-modulation-of-dendritic-cell-phenotype-and-activation-of-cd8-t-cells-for-use-in-cell-based-immunotherapies
#17
Hannah Frizzell, Jaehyung Park, Natacha Comandante Lou, Kim A Woodrow
Dendritic cell (DC)-based immunotherapies have much utility in their ability to prime antigen-specific adaptive immune responses. However, there does not yet exist a consensus standard to how DCs should be primed. In this study, we aimed to determine the role of heterogeneous co-cultures, composed of both CD11c+ (DCs) and CD11c- cells, in combination with monophosphoryl lipid A (MPLA) stimulation on DC phenotype and function. Upon DC priming in different co-culture ratios, we observed reduced expression of MHCII and CD86 and increased antigen uptake among CD11c+ cells in a CD11c- dependent manner...
October 13, 2016: Cellular Immunology
https://www.readbyqxmd.com/read/27788572/gm-csf-grown-bone-marrow-derived-cells-are-composed-of-phenotypically-different-dendritic-cells-and-macrophages
#18
Yi Rang Na, Daun Jung, Gyo Jeong Gu, Seung Hyeok Seok
Granulocyte-macrophage colony stimulating factor (GMCSF) has a role in inducing emergency hematopoiesis upon exposure to inflammatory stimuli. Although GM-CSF generated murine bone marrow derived cells have been widely used as macrophages or dendritic cells in research, the exact characteristics of each cell population have not yet been defined. Here we discriminated GM-CSF grown bone marrow derived macrophages (GM-BMMs) from dendritic cells (GM-BMDCs) in several criteria. After C57BL/6Jmice bone marrow cell culture for 7 days with GM-CSF supplementation, two main populations were observed in the attached cells based on MHCII and F4/80 marker expressions...
October 28, 2016: Molecules and Cells
https://www.readbyqxmd.com/read/27777106/in%C3%A2-vitro-modulation-of-drimys-winteri-bark-extract-and-the-active-compound-polygodial-on-salmo-salar-immune-genes-after-exposure-to%C3%A2-saprolegnia-parasitica
#19
D Pereira-Torres, A T Gonçalves, V Ulloa, R Martínez, H Carrasco, A F Olea, L Espinoza, C Gallardo-Escárate, A Astuya
The rapid development of the aquaculture industry has global concerns with health management and control strategies to prevent and/or treat diseases and increase sustainability standards. Saprolegniosis is a disease caused by Saprolegnia parasitica, and is characterized by promoting an immunosuppression in the host. This study evaluated in vitro the extract and one active compound (polygodial) of Drimys winteri, a Chilean medicinal tree as a potential early immunostimulatory aid in Saprolegniosis control. Atlantic salmon (Salmo salar) head kidney cells (ASK-1) were incubated with both extract and pure polygodial before exposure to S...
December 2016: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/27771254/cd4-foxp3-t-cells-contribute-to-myocardial-ischemia-reperfusion-injury
#20
Denise Mathes, Johannes Weirather, Peter Nordbeck, Anahi-Paula Arias-Loza, Matthias Burkard, Christina Pachel, Thomas Kerkau, Niklas Beyersdorf, Stefan Frantz, Ulrich Hofmann
OBJECTIVE: The present study analyzed the effect of CD4(+) Forkhead box protein 3 negative (Foxp3(-)) T-cells and Foxp3(+) CD4(+) T-cells on infarct size in a mouse myocardial ischemia-reperfusion model. APPROACH AND RESULTS: We examined the infarct size as a fraction of the area-at-risk as primary study endpoint in mice after 30minutes of coronary ligation followed by 24hours of reperfusion. CD4(+) T-cell deficient MHC-II KO mice showed smaller histologically determined infarct size (34...
October 19, 2016: Journal of Molecular and Cellular Cardiology
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