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Mucosal immunology

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https://www.readbyqxmd.com/read/28532268/allergen-immunotherapy-in-allergic-rhinitis-current-use-and-future-trends
#1
Ludger Klimek, Oliver Pfaar, Jean Bousquet, Gabriela Senti, Thomas Kündig
Type-1 allergies are among the most chronic common diseases of humans. Allergen immunotherapy (AIT) is the only causative and disease-modifying treatment option besides allergen avoidance. Severe systemic adverse allergic reactions may be induced by every AIT treatment. Different approaches have been used to provide safer AIT preparations to lower or even totally overcome this risk. Areas covered: A structured literature recherche in Medline and Pubmed under inclusion of national and international guidelines and Cochrane meta-analyses has been performed aiming at reviewing clinical use of such approaches in AIT...
May 23, 2017: Expert Review of Clinical Immunology
https://www.readbyqxmd.com/read/28529928/the-probiotic-compound-vsl-3-modulates-mucosal-peripheral-and-systemic-immunity-following-murine-broad-spectrum-antibiotic-treatment
#2
Ira Ekmekciu, Eliane von Klitzing, Ulrike Fiebiger, Christian Neumann, Petra Bacher, Alexander Scheffold, Stefan Bereswill, Markus M Heimesaat
There is compelling evidence linking the commensal intestinal microbiota with host health and, in turn, antibiotic induced perturbations of microbiota composition with distinct pathologies. Despite the attractiveness of probiotic therapy as a tool to beneficially alter the intestinal microbiota, its immunological effects are still incompletely understood. The aim of the present study was to assess the efficacy of the probiotic formulation VSL#3 consisting of eight distinct bacterial species (including Streptococcus thermophilus, Bifidobacterium breve, B...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28526573/transcriptomic-variation-of-locally-infected-skin-of-epinephelus-coioides-reveals-the-mucosal-immune-mechanism-against-cryptocaryon-irritans
#3
Yazhou Hu, Anxing Li, Yang Xu, Biao Jiang, Geling Lu, Xiaochun Luo
Fish skin is the largest immunologically active mucosal organ, providing first-line defense against external pathogens. However, the skin-associated immune mechanisms of fish are still unclear. Cryptocaryon irritans is an obligate ectoparasitic ciliated protozoan that infects almost all marine fish, and is believed to be an excellent pathogen model to study fish mucosal immunity. In this study, a de novo transcriptome assembly of Epinephelus coioides skin post C. irritans tail-infection was performed for the first time using the Illumina HiSeq™ 2500 system...
May 16, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28513596/an-innate-defense-peptide-bpifa1-splunc1-restricts-influenza-a-virus-infection
#4
K M Akram, N A Moyo, G H Leeming, L Bingle, S Jasim, S Hussain, A Schorlemmer, A Kipar, P Digard, R A Tripp, R V Shohet, C D Bingle, J P Stewart
The airway epithelium secretes proteins that function in innate defense against infection. Bactericidal/permeability-increasing fold-containing family member A1 (BPIFA1) is secreted into airways and has a protective role during bacterial infections, but it is not known whether it also has an antiviral role. To determine a role in host defense against influenza A virus (IAV) infection and to find the underlying defense mechanism, we developed transgenic mouse models that are deficient in BPIFA1 and used these, in combination with in vitro three-dimensional mouse tracheal epithelial cell (mTEC) cultures, to investigate its antiviral properties...
May 17, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28513595/hiv-2-infection-is-associated-with-preserved-galt-homeostasis-and-epithelial-integrity-despite-ongoing-mucosal-viral-replication
#5
S M Fernandes, A R Pires, P Matoso, C Ferreira, H Nunes-Cabaço, L Correia, E Valadas, J Poças, P Pacheco, H Veiga-Fernandes, R B Foxall, A E Sousa
The mechanisms that enable preservation of gut mucosal integrity during persistent viral replication and inherent inflammation remain unclear. Here, we investigated, for the first time, gut homeostasis in HIV-2 infection, a naturally occurring form of attenuated HIV disease. We found viral replication in both sigmoid and ileum of asymptomatic HIV-2+ patients (range: 240-851 circulating CD4+T-cells per μl) despite their undetectable viremia, accompanied by interferon-γ-producing CD8 T-cell expansion, irrespective of antiretroviral treatment...
May 17, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28513594/regionally-compartmentalized-resident-memory-t-cells-mediate-naturally-acquired-protection-against-pneumococcal-pneumonia
#6
N Ms Smith, G A Wasserman, F T Coleman, K L Hilliard, K Yamamoto, E Lipsitz, R Malley, H Dooms, M R Jones, L J Quinton, J P Mizgerd
As children age, they become less susceptible to the diverse microbes causing pneumonia. These microbes are pathobionts that infect the respiratory tract multiple times during childhood, generating immunological memory. To elucidate mechanisms of such naturally acquired immune protection against pneumonia, we modeled a relevant immunological history in mice by infecting their airways with mismatched serotypes of Streptococcus pneumoniae (pneumococcus). Previous pneumococcal infections provided protection against a heterotypic, highly virulent pneumococcus, as evidenced by reduced bacterial burdens and long-term sterilizing immunity...
May 17, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28513593/jak3-deficiency-blocks-innate-lymphoid-cell-development
#7
M L Robinette, M Cella, J B Telliez, T K Ulland, A D Barrow, K Capuder, S Gilfillan, L-L Lin, L D Notarangelo, M Colonna
Loss-of-function mutations in the tyrosine kinase JAK3 cause autosomal recessive severe combined immunodeficiency (SCID). Defects in this form of SCID are restricted to the immune system, which led to the development of immunosuppressive JAK inhibitors. We find that the B6.Cg-Nr1d1(tm1Ven)/LazJ mouse line purchased from Jackson Laboratories harbors a spontaneous mutation in Jak3, generating a SCID phenotype and an inability to generate antigen-independent professional cytokine-producing innate lymphoid cells (ILCs)...
May 17, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28513592/ifn-%C3%AE-increases-susceptibility-to-influenza-a-infection-through-suppression-of-group-ii-innate-lymphoid-cells
#8
D Califano, Y Furuya, S Roberts, D Avram, A N J McKenzie, D W Metzger
Increased levels of interferon-γ (IFN-γ) are routinely observed in the respiratory tract following influenza virus infection, yet its potential role remains unclear. We now demonstrate that influenza-induced IFN-γ restricts protective innate lymphoid cell group II (ILC2) function in the lung following challenge with the pandemic H1N1 A/CA/04/2009 (CA04) influenza virus. Specifically, IFN-γ deficiency resulted in enhanced ILC2 activity, characterized by increased production of interleukin (IL)-5 and amphiregulin, and improved tissue integrity, yet no change in ILC2 numbers, viral load or clearance...
May 17, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28511837/immunomodulatory-activity-of-recombinant-%C3%AE-gliadin-conjugated-to-cholera-toxin-in-dq8-transgenic-mice
#9
Stefano Rossi, Diomira Luongo, Francesco Maurano, Paolo Bergamo, Mauro Rossi
Coeliac disease (CD) is characterized by an intestinal lesion sustained by an abnormal mucosal T-cell response to wheat gliadin. An immunological approach that is able to suppress this immune response is a perspective worth pursuing. Several strategies of antigen administration have been aimed at the downregulation of pathogenic T-cells. In particular, we previously reported a significant suppression of the systemic cell-mediated response toward wheat gliadin in DQ8 transgenic mice receiving nasally a recombinant α-gliadin...
May 13, 2017: Immunology Letters
https://www.readbyqxmd.com/read/28504192/correlates-of-protection-for-enteric-vaccines
#10
Jan Holmgren, Umesh D Parashar, Stanley Plotkin, Jacques Louis, Su-Peing Ng, Eric Desauziers, Valentina Picot, Mitra Saadatian-Elahi
An immunological Correlate of Protection (CoP) is an immune response that is statistically interrelated with protection. Identification of CoPs for enteric vaccines would help design studies to improve vaccine performance of licensed vaccines in low income settings, and would facilitate the testing of future vaccines in development that might be more affordable. CoPs are lacking today for most existing and investigational enteric vaccines. In order to share the latest information on CoPs for enteric vaccines and to discuss novel approaches to correlate mucosal immune responses in humans with protection, the Foundation Mérieux organized an international conference of experts where potential CoPs for vaccines were examined using case-studies for both bacterial and viral enteric pathogens...
May 11, 2017: Vaccine
https://www.readbyqxmd.com/read/28503933/highly-hiv-exposed-seronegative-men-have-lower-mucosal-innate-immune-reactivity
#11
Jennifer A Fulcher, Laura Romas, Jennifer C Hoffman, Julie Elliott, Terry Saunders, Adam Burgener, Peter A Anton, Otto O Yang
Risk of HIV acquisition varies, and some individuals are highly HIV-1-exposed yet persistently seronegative (HESN). The immunologic mechanisms contributing to this phenomenon are an area of intense interest. As immune activation and inflammation facilitate disease progression in HIV-1-infected persons, and gastrointestinal-associated lymphoid tissue (GALT) is a highly susceptible site for transmission, we hypothesized that reduced gut mucosal immune reactivity may contribute to reduced HIV-1 susceptibility in HESN men with a history of numerous rectal sexual exposures...
May 13, 2017: AIDS Research and Human Retroviruses
https://www.readbyqxmd.com/read/28494927/comparison-of-interferon-and-bovine-herpesvirus-1-specific-iga-levels-in-nasal-secretions-of-dairy-cattle-administered-an-intranasal-modified-live-viral-vaccine-prior-to-calving-or-on-the-day-of-calving
#12
Victor S Cortese, Amelia Woolums, David J Hurley, Roy Berghaus, John K Bernard, Thomas H Short
Thirty-two Holstein cows were allocated to receive intranasal vaccination with modified live bovine herpesvirus-1 (BHV-1), bovine respiratory syncytial virus (BRSV) and parainfluenza type 3 virus (PI3V) vaccine either two weeks prior to their projected calving date, or within 24h after calving. Nasal secretions were collected twice at a 12-h interval on the day prior to vaccination (day 0) and at 2, 4, 7, 10 and 14days post vaccination to measure interferon (IFN) alpha, IFN-beta, IFN-gamma, and BHV-1-specific IgA by ELISA...
May 2017: Veterinary Immunology and Immunopathology
https://www.readbyqxmd.com/read/28494786/compositionally-and-functionally-distinct-sinus-microbiota-in-chronic-rhinosinusitis-patients-have-immunological-and-clinically-divergent-consequences
#13
Emily K Cope, Andrew N Goldberg, Steven D Pletcher, Susan V Lynch
BACKGROUND: Chronic rhinosinusitis (CRS) is a heterogeneous disease characterized by persistent sinonasal inflammation and sinus microbiome dysbiosis. The basis of this heterogeneity is poorly understood. We sought to address the hypothesis that a limited number of compositionally distinct pathogenic bacterial microbiota exist in CRS patients and invoke discrete immune responses and clinical phenotypes in CRS patients. RESULTS: Sinus brushings from patients with CRS (n = 59) and healthy individuals (n = 10) collected during endoscopic sinus surgery were analyzed using 16S rRNA gene sequencing, predicted metagenomics, and RNA profiling of the mucosal immune response...
May 12, 2017: Microbiome
https://www.readbyqxmd.com/read/28488693/icos-protects-against-mortality-from-acute-lung-injury-through-activation-of-il-5-ilc2s
#14
C L Hrusch, S T Manns, D Bryazka, J Casaos, C A Bonham, M R Jaffery, K M Blaine, K A M Mills, P A Verhoef, A O Adegunsoye, J W Williams, M Y Tjota, T V Moore, M E Strek, I Noth, A I Sperling
Idiopathic pulmonary fibrosis (IPF) is a progressive lung disease causing irreversible lung scarring and loss of pulmonary function. IPF Patients suffer from a high rate of pulmonary infections and acute exacerbations of disease that further contribute to pulmonary decline. Low expression of the inducible T-cell costimulatory molecule (ICOS) in peripheral blood mononuclear cells predicts decreased survival of IPF patients, but the mechanisms by which ICOS protects are unclear. Using a model of bleomycin-induced lung injury and fibrosis, we now demonstrate that ICOS expression enhances survival from lung injury rather than regulating fibrogenesis...
May 10, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28487600/dietary-compliance-in-celiac-disease
#15
EDITORIAL
Hugh James Freeman
Celiac disease is an immune-mediated disorder that causes severe architectural disturbance in the small intestinal mucosa of genetically-predisposed individuals. Impaired absorption of multiple nutrients results and diarrhea and weight loss develop. Evidence has accumulated that a strict gluten-free diet can result in resolution of diarrhea, weight gain and normalization of nutrient malabsorption. In addition, histopathological changes also normalize, but this histopathological response appears to be time-dependent, sex-dependent and age-dependent...
April 21, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28474815/probiotic-supplementation-promotes-a-reduction-in-t-cell-activation-an-increase-in-th17-frequencies-and-a-recovery-of-intestinal-epithelium-integrity-and-mitochondrial-morphology-in-art-treated-hiv-1-positive-patients
#16
Gabriella d'Ettorre, Giacomo Rossi, Carolina Scagnolari, Mauro Andreotti, Noemi Giustini, Sara Serafino, Ivan Schietroma, Giuseppe Corano Scheri, Saeid Najafi Fard, Vito Trinchieri, Paola Mastromarino, Carla Selvaggi, Silvia Scarpona, Gianfranco Fanello, Fausto Fiocca, Giancarlo Ceccarelli, Guido Antonelli, Jason M Brenchley, Vincenzo Vullo
INTRODUCTION: HIV infection is characterized by a persistent immune activation associated to a compromised gut barrier immunity and alterations in the profile of the fecal flora linked with the progression of inflammatory symptoms. The effects of high concentration multistrain probiotic (Vivomixx®, Viale del Policlinico 155, Rome, Italy in EU; Visbiome®, Dupont, Madison, Wisconsin in USA) on several aspects of intestinal immunity in ART-experienced HIV-1 patients was evaluated. METHODS: A sub-study of a longitudinal pilot study was performed in HIV-1 patients who received the probiotic supplement twice a day for 6 months (T6)...
April 20, 2017: Immunity, Inflammation and Disease
https://www.readbyqxmd.com/read/28472424/ven-120-a-recombinant-human-lactoferrin-promotes-a-regulatory-t-cell-treg-phenotype-and-drives-resolution-of-inflammation-in-distinct-murine-models-of-inflammatory-bowel-disease
#17
Christopher F MacManus, Colm B Collins, Tom T Nguyen, Randall W Alfano, Paul Jedlicka, Edwin F de Zoeten
Background and Aims: Inflammatory bowel disease (IBD) is characterized by a disruption of immune homeostasis, which is tightly regulated to protect against harmful pathogens yet not react to commensal antigens. Animal studies indicate that regulatory T cells (Treg) modulate the immune response to prevent IBD development. Lactoferrin (LF), is an endogenous anti-inflammatory pleiotropic protein secreted at high concentrations in colostrum and at mucosal sites. However, the effect of LF on specific T lymphocyte populations has not been studied...
May 2, 2017: Journal of Crohn's & Colitis
https://www.readbyqxmd.com/read/28469999/immunodeficiency-associated-lymphoid-hyperplasia-as-a-cause-of-intussusception-in-a-case-of-activated-pi3k-%C3%AE-syndrome
#18
Daniel Mettman, Isabelle Thiffault, Chitra Dinakar, Carol Saunders
Activated PI3K-δ syndrome refers to a recently described primary immunodeficiency syndrome consisting of recurrent sinopulmonary infections, lymphadenopathy, mucosal lymphoid aggregates, increased susceptibility to Epstein-Barr virus and cytomegalovirus, and increased incidence of B-cell lymphomas. Variants in PIK3CD, which encodes the phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit delta isoform, enhance membrane association and kinase activity, resulting in increased signal transduction through the PI3K-Akt pathway...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/28463882/impact-of-intensified-antiretroviral-therapy-during-early-hiv-infection-on-gut-immunology-and-inflammatory-blood-biomarkers-a-randomized-controlled-trial
#19
Connie J Kim, Rodney Rousseau, Sanja Huibner, Colin Kovacs, Erika Benko, Kamnoosh Shahabi, Gabor Kandel, Mario Ostrowski, Rupert Kaul
OBJECTIVE: Standard antiretroviral therapy (ART) is slow to reverse gut mucosal immune defects that cause persistent inflammation and immune activation. We examined whether intensifying early-administered ART through the addition of maraviroc and raltegravir would accelerate their resolution. DESIGN: ART-naïve men with early HIV infection were randomized in a double-blind manner to receive ART (emtricitabine/tenofovir disoproxil fumarate + lopinavir/ritonavir), together with either combined raltegravir/maraviroc or placebo, for 48 weeks...
May 1, 2017: AIDS
https://www.readbyqxmd.com/read/28459871/immunological-effects-of-reduced-mucosal-integrity-in-the-early-life-of-balb-c-mice
#20
Katja Maria Bendtsen, Camilla Hartmann Friis Hansen, Łukasz Krych, Kerstin Skovgaard, Witold Kot, Finn Kvist Vogensen, Axel Kornerup Hansen
Certain stimuli at the gut barrier may be necessary in early life to establish a proper balance of immune tolerance. We evaluated a compromised barrier in juvenile mice in relation to microbiota and local and systemic immunity. BALB/c mice were treated with a low dose of dextran sulfate sodium (DSS) with or without ampicillin and lipopolysaccharide (LPS) to clarify the importance of microbial antigens and interaction between microbial-associated patterns and toll-like receptors. The barrier breach resulted in increased plasma LPS, which was highest in mice treated simultaneously with ampicillin...
2017: PloS One
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