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Immunopathology

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https://www.readbyqxmd.com/read/28818789/immune-mechanisms-of-respiratory-viral-infections-in-asthma
#1
REVIEW
Hugo A Farne, Sebastian L Johnston
The more severe pathology respiratory viral infections produce in asthma sufferers is a result of a dysregulated immune response. Excess type 2 inflammation is a well-described feature of virally induced asthma exacerbations, with growing evidence that production of antiviral interferons may also be impaired. However, the mechanisms underlying these are little understood. This review summarizes the current understanding and recent discoveries of the cellular and molecular events that follow viral infections in asthma...
August 14, 2017: Current Opinion in Immunology
https://www.readbyqxmd.com/read/28818622/benefits-of-immune-protection-versus-immunopathology-costs-a-synthesis-from-cytokine-ko-models
#2
Gabriele Sorci, Cédric Lippens, Clothilde Léchenault, Bruno Faivre
The inflammatory response can produce damage to host tissues and in several infectious diseases the most severe symptoms are due to immunopathology rather than a direct effect of pathogen multiplication. One hypothesis for the persistence of inflammatory damage posits that the benefits of protection towards infection outweigh the costs. We used data on knocked-out (KO) cytokine models [and the corresponding wild-type (WT) controls] to test this hypothesis. We computed differences in pathogen load and host survival between WT and KO and divided them by the WT values...
August 14, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28812547/lung-epithelial-cells-therapeutically-inducible-effectors-of-antimicrobial-defense
#3
REVIEW
M M Leiva-Juárez, J K Kolls, S E Evans
Lung epithelial cells are increasingly recognized to be active effectors of microbial defense, contributing to both innate and adaptive immune function in the lower respiratory tract. As immune sentinels, lung epithelial cells detect diverse pathogens through an ample repertoire of membrane-bound, endosomal, and cytosolic pattern-recognition receptors (PRRs). The highly plastic epithelial barrier responds to detected threats via modulation of paracellular flux, intercellular communications, mucin production, and periciliary fluid composition...
August 16, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28808975/isolation-of-group-2-innate-lymphoid-cells-from-mouse-lungs
#4
Claudia U Duerr, Jörg H Fritz
The recently described group 2 innate lymphoid cells (ILC2) exert critical roles in type 2 immune responses, epithelial repair at mucosal tissues and metabolic homeostasis. ILC2 release large amounts of type 2 cytokines such as interleukin 4 (IL-4), IL-5, and IL-13, driving type 2 immunity such as the defense against helminths. However, if not tightly regulated ILC2 can trigger unwanted type 2 immunopathologies including allergic airway inflammation, airway hyper-responsiveness, and atopic dermatitis. Viral respiratory tract infections, archetypal triggers of type 1 immune responses, often give rise to pulmonary type 2 immunopathologies such as asthma and asthma exacerbations...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28807478/role-of-lipid-mediators-in-the-regulation-of-oxidative-stress-and-inflammatory-responses-in-dairy-cattle
#5
REVIEW
Vengai Mavangira, Lorraine M Sordillo
Periparturient dairy cows experience an increased incidence and severity of several inflammatory-based diseases such as mastitis and metritis. Factors associated with the physiological adaptation to the onset of lactation can impact the efficiency of the inflammatory response at a time when it is most needed to eliminate infectious pathogens that cause these economically important diseases. Oxidative stress, for example, occurs when there is an imbalance between the production of oxygen radicals during periods of high metabolic demand and the reduced capabilities of the host's antioxidant defenses...
August 2, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28783896/liver-fluke-associated-biliary-tract-cancer
#6
REVIEW
Piyapan Prueksapanich, Panida Piyachaturawat, Prapimphan Aumpansub, Wiriyaporn Ridtitid, Roongruedee Chaiteerakij, Rungsun Rerknimitr
Cholangiocarcinoma (CCA) is an aggressive cancer arising from epithelial cells of the bile duct. Most patients with CCA have an unresectable tumor at the time of diagnosis. In Western countries, the risk of CCA increases in patients with primary sclerosing cholangitis, whereas liver fluke infection appears to be the major risk factor for CCA in Asian countries. A diagnosis of liver fluke infection often relies on stool samples, including microscopic examination, polymerase chain reaction-based assays, and fluke antigen detection...
August 9, 2017: Gut and Liver
https://www.readbyqxmd.com/read/28774928/the-microbial-metabolite-desaminotyrosine-protects-from-influenza-through-type-i-interferon
#7
Ashley L Steed, George P Christophi, Gerard E Kaiko, Lulu Sun, Victoria M Goodwin, Umang Jain, Ekaterina Esaulova, Maxim N Artyomov, David J Morales, Michael J Holtzman, Adrianus C M Boon, Deborah J Lenschow, Thaddeus S Stappenbeck
The microbiota is known to modulate the host response to influenza infection through as-yet-unclear mechanisms. We hypothesized that components of the microbiota exert effects through type I interferon (IFN), a hypothesis supported by analysis of influenza in a gain-of-function genetic mouse model. Here we show that a microbially associated metabolite, desaminotyrosine (DAT), protects from influenza through augmentation of type I IFN signaling and diminution of lung immunopathology. A specific human-associated gut microbe, Clostridium orbiscindens, produced DAT and rescued antibiotic-treated influenza-infected mice...
August 4, 2017: Science
https://www.readbyqxmd.com/read/28774724/human-endogenous-retrovirus-herv-k-hml-2-env-expression-is-not-associated-with-markers-of-immunosenescence
#8
Saara Marttila, Tapio Nevalainen, Juulia Jylhävä, Laura Kananen, Marja Jylhä, Antti Hervonen, Mikko Hurme
Ageing of the human immune system, or immunosenescence, is characterised by distinct changes in the proportion of the various cell types, e.g., increase of the CD14+ monocytic cells, decrease of CD19+ B lymphocytes, and changes in T cell subpopulations, namely increase of CD4+ and CD8+ cells which have lost the costimulatory CD28 antigen. Currently, it is believed that the lifelong antigenic burden may be one of the inducers of immunosenescence. Thus far, only one exogenous stimulus, cytomegalovirus infection, has shown to be a major factor in this respect...
August 1, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28774302/airway-and-parenchyma-immune-cells-in-influenza-a-h1n1-pdm09-viral-and-non-viral-diffuse-alveolar-damage
#9
Monique Buttignol, Ruy Camargo Pires-Neto, Renata Calciolari Rossi E Silva, Marina Ballarin Albino, Marisa Dolhnikoff, Thais Mauad
BACKGROUND: Diffuse alveolar damage (DAD), which is the histological surrogate for acute respiratory distress syndrome (ARDS), has a multifactorial aetiology. Therefore it is possible that the immunopathology differs among the various presentations of DAD. The aim of this study is to compare lung immunopathology of viral (influenza A(H1N1)pdm09) to non-viral, extrapulmonary aetiologies in autopsy cases with DAD. METHODS: The lung tissue of 44 patients, was divided in the H1N1 group (n = 15) characterized by severe pulmonary injury due to influenza A(H1N1)pdm09 infection; the ARDS group (n = 13), characterized by patients with DAD due to non-pulmonary causes; and the Control group (n = 16), consisting of patients with non-pulmonary causes of death...
August 3, 2017: Respiratory Research
https://www.readbyqxmd.com/read/28765225/b-cell-requirement-for-robust-regulatory-t-cell-responses-to-friend-retrovirus-infection
#10
Tyler C Moore, Lorena M Gonzaga, Jennifer M Mather, Ronald J Messer, Kim J Hasenkrug
Regulatory T cells (Tregs) are immunosuppressive cells of the immune system that control autoimmune reactivity. Tregs also respond during immune reactions to infectious agents in order to limit immunopathological damage from potent effectors such as CD8(+) cytolytic T lymphocytes. We have used the Friend virus (FV) model of retroviral infection in mice to investigate how viral infections induce Tregs. During acute FV infection, there is significant activation and expansion of thymus-derived (natural) Tregs that suppress virus-specific CD8(+) T cell responses...
August 1, 2017: MBio
https://www.readbyqxmd.com/read/28765121/novel-therapies-for-immune-mediated-inflammatory-diseases-what-can-we-learn-from-their-use-in-rheumatoid-arthritis-spondyloarthritis-systemic-lupus-erythematosus-psoriasis-crohn-s-disease-and-ulcerative-colitis
#11
REVIEW
Kenneth F Baker, John D Isaacs
The past three decades have witnessed remarkable advances in our ability to target specific elements of the immune and inflammatory response, fuelled by advances in both biotechnology and disease knowledge. As well as providing superior treatments for immune-mediated inflammatory diseases (IMIDs), such therapies also offer unrivalled opportunities to study the underlying immunopathological basis of these conditions.In this review, we explore recent approaches to the treatment of IMIDs and the insights to pathobiology that they provide...
August 1, 2017: Annals of the Rheumatic Diseases
https://www.readbyqxmd.com/read/28760935/overexpression-of-candida-albicans-secreted-aspartyl-proteinases-2-or-5-is-not-sufficient-for-exacerbation-of-immunopathology-in-a-murine-model-of-vaginitis
#12
Hubertine M E Willems, Winter S Bruner, Katherine S Barker, Junyan Liu, Glen E Palmer, Brian M Peters
The secreted aspartyl protineases of C. albicans have long been implicated in virulence at the mucosal surface, including contribution to colonization and immunopathogenesis during vulvovaginal candidiasis. In an effort to disentangle hypha-associated virulence factor regulation from morphological transition, the purpose of this study was to determine if overexpression of SAP2 or SAP5 in a efg1Δ/Δ/cph1Δ/Δ mutant could restore capacity to cause immunopathology during murine vaginitis to this avirulent hypofilamentous strain...
July 31, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28760387/the-role-of-th17-cells-in-auto-inflammatory-neurological-disorders
#13
REVIEW
Foozhan Tahmasebinia, Arash Pourgholaminejad
The role of T helper 17 (Th17) cells in auto-inflammatory neurological disorders such as Multiple Sclerosis (MS), Alzheimer's disease (AD), Parkinson's disease (PD) and schizophrenia has not been clarified completely. Th17-derived pro-inflammatory cytokines including IL-17, IL-21, IL-22, IL-23, GM-CSF, and IFN-γ have a critical role in the pathogenesis of these disorders. In this review, we demonstrate the role of Th17 cells and their related cytokines in the immunopathology of above-mentioned disorders to get a better understanding of neuroinflammatory mechanisms mediated by Th17 cells associated with events leading to neurodegeneration...
July 29, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28759052/d-mannose-induces-regulatory-t-cells-and-suppresses-immunopathology
#14
Dunfang Zhang, Cheryl Chia, Xue Jiao, Wenwen Jin, Shimpei Kasagi, Ruiqing Wu, Joanne E Konkel, Hiroko Nakatsukasa, Peter Zanvit, Nathan Goldberg, Qianming Chen, Lingyun Sun, Zi-Jiang Chen, WanJun Chen
D-mannose, a C-2 epimer of glucose, exists naturally in many plants and fruits, and is found in human blood at concentrations less than one-fiftieth of that of glucose. However, although the roles of glucose in T cell metabolism, diabetes and obesity are well characterized, the function of D-mannose in T cell immune responses remains unknown. Here we show that supraphysiological levels of D-mannose safely achievable by drinking-water supplementation suppressed immunopathology in mouse models of autoimmune diabetes and airway inflammation, and increased the proportion of Foxp3(+) regulatory T cells (Treg cells) in mice...
July 24, 2017: Nature Medicine
https://www.readbyqxmd.com/read/28755388/kir-on-the-cusp%C3%A2-of%C3%A2-modern-immunogenetics
#15
REVIEW
Francesco Colucci, James Traherne
Killer Immunoglobulin-like Receptors (KIR) and their Human Leukocyte Antigen (HLA) ligands play a central role in immunity and human health. These molecules are encoded by gene families with copy number variation, extreme levels of sequence diversity and complex expression patterns. The rapid evolution of KIR and HLA genes and their associations with infectious diseases, pregnancy disorders, immunopathologies and outcome of cell transplantation has generated considerable interest from immunologists, geneticists and clinicians...
July 29, 2017: Immunology
https://www.readbyqxmd.com/read/28752372/the-cutaneous-spectrum-of-lupus-erythematosus
#16
REVIEW
Simone Ribero, Savino Sciascia, Luca Borradori, Dan Lipsker
Systemic lupus erythematosus is a complex autoimmune disease with a wide spectrum of clinical and immunopathological features. Cutaneous and articular manifestations are the most common signs in patients with systemic lupus erythematosus. We here review the pathogenesis and the new classification of cutaneous lupus erythemathosus with a discussion of the significance of the various cutaneous signs. The lesions are classified according to the level of the cellular infiltrate and tissue damage in the epidermis, dermis, and/or subcutis...
July 27, 2017: Clinical Reviews in Allergy & Immunology
https://www.readbyqxmd.com/read/28749409/host-response-comparison-of-h1n1-and-h5n1-infected-mice-identifies-two-potential-death-mechanisms
#17
Olivier Leymarie, Léa Meyer, Pierre-Louis Hervé, Bruno Da Costa, Bernard Delmas, Christophe Chevalier, Ronan Le Goffic
Highly pathogenic influenza A viruses (IAV) infections represent a serious threat to humans due to their considerable morbidity and mortality capacities. A good understanding of the molecular mechanisms responsible for the acute lung injury observed during this kind of infection is essential to design adapted therapies. In the current study, using an unbiased transcriptomic approach, we compared the host-responses of mice infected with two different subtypes of IAV: H1N1 vs. H5N1. The host-response comparison demonstrated a clear difference between the transcriptomic profiles of H1N1- and H5N1-infected mice despite identical survival kinetics and similar viral replications...
July 27, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28749386/epidermolysis-bullosa-acquisita-and-anti-p200-pemphigoid-as-major-subepidermal-autoimmune-bullous-diseases-diagnosed-by-floor-binding-on-indirect-immunofluorescence-microscopy-using-human-salt-split-skin
#18
Nupur Goyal, Raghavendra Rao, Shrutakirthi D Shenoi, Sathish Pai, Pramod Kumar, Balbir S Bhogal, Enno Schmidt, Detlef Zillikens
BACKGROUND: Subepidermal autoimmune bullous diseases are a diverse group of diseases with overlapping clinical and immunopathological features. Indirect immunofluorescence microscopy on artificially split skin helps to classify these conditions into those with staining on the epidermal side of the split ("roof-binding") and those with staining on the dermal side ("floor-binding"). Epidermolysis bullosa acquisita is the prototype of "floor-binding" subepidermal autoimmune bullous diseases...
September 2017: Indian Journal of Dermatology, Venereology and Leprology
https://www.readbyqxmd.com/read/28749325/central-and-peripheral-reservoirs-of-feline-immunodeficiency-virus-in-cats-a-review
#19
Chrissy D Eckstrand, Ellen E Sparger, Brian G Murphy
Infection with feline immunodeficiency virus (FIV), a lentivirus similar to human immunodeficiency virus (HIV), results in lifelong viral persistence and progressive immunopathology in the cat. FIV has the ability to infect and produce infectious virus in a number of different cell types. FIV provirus can also be maintained in a replication-competent but transcriptionally quiescent state, facilitating viral persistence over time. Immediately after the initial infection, FIV infection quickly disseminates to many anatomical compartments within the host including lymphoid organs, gastrointestinal tract and brain...
July 28, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28747747/involvement-of-monocyte-subsets-in-the-immunopathology-of-giant-cell-arteritis
#20
Yannick van Sleen, Qi Wang, Kornelis S M van der Geest, Johanna Westra, Wayel H Abdulahad, Peter Heeringa, Annemieke M H Boots, Elisabeth Brouwer
Monocytes/macrophages are critical in systemic and local inflammation in giant cell arteritis (GCA) and possibly in clinically overlapping polymyalgia rheumatica (PMR). Therefore, we aimed to understand the contribution of monocyte subsets and the CX3CR1-CX3CL1 and CCR2-CCL2 migratory pathways, to the pathology of GCA. Peripheral blood monocytes were enumerated in samples from newly-diagnosed, untreated GCA and PMR patients and after prednisone-induced remission. The distribution of classical (CD14(bright)CD16(neg)) and the more pro-inflammatory, intermediate (CD14(bright)CD16+) and non-classical (CD14(dim)CD16+) monocyte subsets was analysed by flow cytometry...
July 26, 2017: Scientific Reports
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