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Helminths, immune

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https://www.readbyqxmd.com/read/28208221/increased-fas-ligand-expression-of-peripheral-b-1-cells-correlated-with-cd4-t-cell-apoptosis-in-filarial-infected-patients
#1
Rashmi Mishra, Santosh K Panda, Prakash K Sahoo, Bal, A K Satapathy
Cellular hypo responsiveness observed during helminth infections are attributed to factors like Antigen presenting cells (APC) dysfunction, increased Interleukin-10(IL-10), regulatory T cells and induction of CD4(+) T (Th) cell apoptosis.. Increased Fas ligand (FasL) expression on the surface of B-1 cells and induction of apoptosis of Th cells by FasL expressing B-1 cells due to helminth infection was demonstrated in murine model of helminth infection where as profile of FasL expression, Th cell apoptosis and correlation between these two populations of cells in clinical filariasis remain unknown...
February 16, 2017: Parasite Immunology
https://www.readbyqxmd.com/read/28196762/enteric-helminth-induced-type-i-interferon-signalling-protects-against-pulmonary-virus-infection-through-interaction-with-the-microbiota
#2
Amanda J McFarlane, Henry J McSorley, Donald J Davidson, Paul M Fitch, Claire Errington, Karen J Mackenzie, Eva S Gollwitzer, Chris J C Johnston, Andrew S MacDonald, Michael R Edwards, Nicola L Harris, Benjamin J Marsland, Rick M Maizels, Jürgen Schwarze
BACKGROUND: Helminth parasites have been reported to have beneficial immune modulatory effects in allergic and autoimmune conditions and detrimental consequences in tuberculosis and some viral infections. Their role in co-infection with respiratory viruses is not clear. OBJECTIVE: Here, we investigated the effects of strictly enteric helminth infection with Heligmosomoides polygyrus on respiratory syncytial virus (RSV) infection in a mouse model. METHODS: A murine helminth/ RSV co-infection model was developed...
February 11, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28192541/immune-driven-alterations-in-mucin-sulphation-is-an-important-mediator-of-trichuris-muris-helminth-expulsion
#3
Sumaira Z Hasnain, Paul A Dawson, Rohan Lourie, Peter Hutson, Hui Tong, Richard K Grencis, Michael A McGuckin, David J Thornton
Mucins are heavily glycosylated proteins that give mucus its gel-like properties. Moreover, the glycans decorating the mucin protein core can alter the protective properties of the mucus barrier. To investigate whether these alterations could be parasite-induced we utilized the Trichuris muris (T. muris) infection model, using different infection doses and strains of mice that are resistant (high dose infection in BALB/c and C57BL6 mice) or susceptible (high dose infection in AKR and low dose infection in BALB/c mice) to chronic infection by T...
February 13, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28192437/species-dependent-impact-of-helminth-derived-antigens-on-human-macrophages-infected-with-mycobacterium-tuberculosis-direct-effect-on-the-innate-anti-mycobacterial-response
#4
Naomi Aira, Anna-Maria Andersson, Susmita K Singh, Derek M McKay, Robert Blomgran
BACKGROUND: In countries with a high prevalence of tuberculosis there is high coincident of helminth infections that might worsen disease outcome. While Mycobacterium tuberculosis (Mtb) gives rise to a pro-inflammatory Th1 response, a Th2 response is typical of helminth infections. A strong Th2 response has been associated with decreased protection against tuberculosis. PRINCIPAL FINDINGS: We investigated the direct effect of helminth-derived antigens on human macrophages, hypothesizing that helminths would render macrophages less capable of controlling Mtb...
February 13, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28191818/changes-in-protein-expression-after-treatment-with-ancylostoma-caninum-excretory-secretory-products-in-a-mouse-model-of-colitis
#5
Javier Sotillo, Ivana Ferreira, Jeremy Potriquet, Thewarach Laha, Severine Navarro, Alex Loukas, Jason Mulvenna
Different reports have highlighted the potential use of helminths and their secretions in the treatment of inflammatory bowel disease (IBD) conditions; however, no reports have investigated their effects at a proteome level. Herein, we characterise the protein expression changes that occur in lamina propria (LP) and the intestinal epithelial cells (IEC) of mice with dextran sulfate sodium (DSS)-induced colitis treated with Ancylostoma caninum excretory/secretory (ES) products using a quantitative proteomic approach...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28188768/frequency-of-toxocara-spp-antibodies-in-umbilical-cords-of-newborns-attended-atthe-university-hospital-in-southern-brazil-and-factors-associated-with-infection
#6
Paula Costa Santos, Paula Lima Telmo, Lis Maurente Lehmann, Carolina Lorenzi, Carolina Hirsch, Gabriela Torres Mattos, Gabriel Baracy Klafke, Maria Elisabeth Aires Berne, Carla Vitola Gonçalves, Carlos James Scaini
Toxocariasis is a neglected and geographically widespread parasitic disease. The detection of specific antibodies associated with this disease is required to confirm its clinical diagnosis and to aid in prevention. Although helminth infection during pregnancy can promote foetal immune responses with long-term effects, specific information regarding the risk of Toxocara spp. infection to the human foetus during pregnancy is lacking.Therefore,the present study aimed to investigate the frequency of antibodies against Toxocara spp...
February 7, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28186428/eosinophils-regulate-interferon-alpha-production-in-plasmacytoid-dendritic-cells-stimulated-with-components-of-neutrophil-extracellular-traps
#7
Joanna Skrzeczynska-Moncznik, Katarzyna Zabieglo, Jozef P Bossowski, Oktawia Osiecka, Agnieszka Wlodarczyk, Monika Kapinska-Mrowiecka, Mateusz Kwitniewski, Pawel Majewski, Adam Dubin, Joanna Cichy
Eosinophils constitute an important component of helminth immunity and are not only associated with various allergies but are also linked to autoinflammatory disorders, including the skin disease psoriasis. Here we demonstrate the functional relationship between eosinophils and plasmacytoid dendritic cells (pDCs) as related to skin diseases. We previously showed that pDCs colocalize with neutrophil extracellular traps (NETs) in psoriatic skin. Here we demonstrate that eosinophils are found in psoriatic skin near neutrophils and NETs, suggesting that pDC responses can be regulated by eosinophils...
February 10, 2017: Journal of Interferon & Cytokine Research
https://www.readbyqxmd.com/read/28132936/rhs6-mediated-chromosomal-looping-and-nuclear-substructure-binding-is-required-for-th2-cytokine-gene-expression
#8
Soo Seok Hwang, Sung Woong Jang, Gap Ryol Lee
Subset-specific gene expression is a critical feature of CD4 T cell differentiation. Th2 cells express Th2 cytokine genes including Il4, Il5, and Il13 and mediate the immune response against helminths. The expression of Th2 cytokine genes is regulated by Rad50 hypersensitive site 6 (RHS6) in the Th2 locus control region; however, the molecular mechanisms of RHS6 action at the chromatin level are poorly understood. Here, we demonstrate that RHS6 is crucial for chromosomal interactions and nuclear substructure binding of the Th2 cytokine locus...
January 27, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28128208/mtorc2-signalling-regulates-m2-macrophage-differentiation-in-response-to-helminth-infection-and-adaptive-thermogenesis
#9
R W Hallowell, S L Collins, J M Craig, Y Zhang, M Oh, P B Illei, Y Chan-Li, C L Vigeland, W Mitzner, A L Scott, J D Powell, M R Horton
Alternatively activated macrophages (M2) have an important function in innate immune responses to parasitic helminths, and emerging evidence also indicates these cells are regulators of systemic metabolism. Here we show a critical role for mTORC2 signalling in the generation of M2 macrophages. Abrogation of mTORC2 signalling in macrophages by selective conditional deletion of the adaptor molecule Rictor inhibits the generation of M2 macrophages while leaving the generation of classically activated macrophages (M1) intact...
January 27, 2017: Nature Communications
https://www.readbyqxmd.com/read/28127363/anti-inflammatory-potentials-of-excretory-secretory-es-and-somatic-products-of-marshallagia-marshalli-on-allergic-airway-inflammation-in-balb-c-mice
#10
Sima Parande Shirvan, Hassan Borji, Ahmadreza Movassaghi, Mohammadreza Khakzad, Hamidreza Farzin, Mohsen Maleki, Alireza Haghparast
BACKGROUND: Inverse relationship between helminths infection and immune-mediated diseases has inspired researchers to investigate therapeutic potential of helminths in allergic asthma. Helminth unique ability to induce immunoregulatory responses has already been documented in several experimental studies. This study was designed to investigate whether excretory/secretory (ES) and somatic products of Marshallagia marshalli modulate the development of ovalbumin-induced airway inflammation in a mouse model...
October 2016: Iranian Journal of Parasitology
https://www.readbyqxmd.com/read/28125577/identification-of-three-immunodominant-motifs-with-atypical-isotype-profile-scattered-over-the-onchocerca-volvulus-proteome
#11
Ole Lagatie, Bieke Van Dorst, Lieven J Stuyver
Understanding the immune response upon infection with the filarial nematode Onchocerca volvulus and the mechanisms that evolved in this parasite to evade immune mediated elimination is essential to expand the toolbox available for diagnostics, therapeutics and vaccines development. Using high-density peptide microarrays we scanned the proteome-wide linear epitope repertoire in Cameroonian onchocerciasis patients and healthy controls from Southern Africa which led to the identification of 249 immunodominant antigenic peptides...
January 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28120841/intestinal-helminth-infection-impacts-the-systemic-distribution-and-function-of-the-naive-lymphocyte-pool
#12
I L King, K Mohrs, A P Meli, J Downey, P Lanthier, F Tzelepis, J H Fritz, A V Tumanov, M Divangahi, E A Leadbetter, M Mohrs
Homeostasis is a fundamental principle of biological systems. A paradigm of immune homeostasis is the remarkably constant number of naive T and B lymphocytes in the body that continuously circulate through the secondary lymphoid organs to maximize immune surveillance. Whether the dynamics and distribution of the systemic naive lymphocyte pool is affected following organ-specific infection is not known. Here we show that, following infection of mice with an enteric helminth, naive T and B lymphocytes accumulate in the T helper type 2-reactive mesenteric lymph node while they are concurrently depleted from non-draining peripheral lymph nodes...
January 25, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28094319/helminth-induced-ly6c-hi-monocyte-derived-alternatively-activated-macrophages-suppress-experimental-autoimmune-encephalomyelitis
#13
Cesar Terrazas, Juan de Dios Ruiz-Rosado, Stephanie A Amici, Kyle A Jablonski, Diana Martinez-Saucedo, Lindsay M Webb, Hanna Cortado, Frank Robledo-Avila, Steve Oghumu, Abhay R Satoskar, Miriam Rodriguez-Sosa, Luis I Terrazas, Mireia Guerau-de-Arellano, Santiago Partida-Sánchez
Helminths cause chronic infections and affect the immune response to unrelated inflammatory diseases. Although helminths have been used therapeutically to ameliorate inflammatory conditions, their anti-inflammatory properties are poorly understood. Alternatively activated macrophages (AAMϕs) have been suggested as the anti-inflammatory effector cells during helminth infections. Here, we define the origin of AAMϕs during infection with Taenia crassiceps, and their disease-modulating activity on the Experimental Autoimmune Encephalomyelitis (EAE)...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28087937/myeloid-cell-phenotypes-in-susceptibility-and-resistance-to-helminth-parasite-infections
#14
Rick M Maizels, James P Hewitson
Many major tropical diseases are caused by long-lived helminth parasites that are able to survive by modulation of the host immune system, including the innate compartment of myeloid cells. In particular, dendritic cells and macrophages show markedly altered phenotypes during parasite infections. In addition, many specialized subsets such as eosinophils and basophils expand dramatically in response to these pathogens. The changes in phenotype and function, and their effects on both immunity to infection and reactivity to bystander antigens such as allergens, are discussed...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28086814/intestinal-helminth-co-infection-and-associated-factors-among-tuberculosis-patients-in-arba-minch-ethiopia
#15
Getaneh Alemu, Mohammedaman Mama
BACKGROUND: Helminths affect the outcome of tuberculosis by shifting cell mediated immune response to humoral and by total suppression of the host immune system. On the reverse, Mycobacterium infection favors immune escape of helminths. Therefore assessing helminth co-infection rate and predisposing factors in tuberculosis patients is mandatory to set strategies for better case management. METHODS: Facility based cross-sectional study was conducted in Arba Minch to assess the prevalence and associated factors of intestinal helminths among pulmonary tuberculosis patients from January to August, 2016...
January 13, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28076799/adenylyl-cyclase-type-9-gene-polymorphisms-are-associated-with-asthma-and-allergy-in-brazilian-children
#16
Helena M P Teixeira, Neuza M Alcantara-Neves, Maurício Barreto, Camila A Figueiredo, Ryan S Costa
Asthma is a chronic inflammatory disease of the respiratory tract. This heterogeneous disease is caused by the interaction of interindividual genetic variability and environmental factors. The gene adenylyl cyclase type 9 (ADCY9) encodes a protein called adenylyl cyclase (AC), responsible for producing the second messenger cyclic AMP (cAMP). cAMP is produced by T regulatory cells and is involved in the down-regulation of T effector cells. Failures in cAMP production may be related to an imbalance in the regulatory immune response, leading to immune-mediated diseases, such as allergic disorders...
January 8, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28069101/immune-responses-in-mice-vaccinated-with-a-dna-vaccine-expressing-serine-protease-like-protein-from-the-new-born-larval-stage-of-trichinella-spiralis
#17
Jing Xu, Xue Bai, Li Bo Wang, Hai Ning Shi, Joke W B VAN DER Giessen, Pascal Boireau, Ming Yuan Liu, Xiao Lei Liu
Trichinella spiralis is a parasitic helminth that can infect almost all mammals, including humans. Trichinella spiralis infection elicits a typical type 2 immune responses, while suppresses type 1 immune responses, which is in favour of their parasitism. DNA vaccines have been shown to be capable of eliciting balanced CD4+ and CD8+ T cell responses as well as humoral immune responses in small-animal models, which will be advantage to induce protective immune response against helminth infection. In this study, serine protease (Ts-NBLsp) was encoded by a cDNA fragment of new-born T...
January 10, 2017: Parasitology
https://www.readbyqxmd.com/read/28066896/parasite-excretory-secretory-products-and-their-effects-on-metabolic-syndrome
#18
Jenny Crowe, Felicity E Lumb, Margaret M Harnett, William Harnett
Obesity, one of the main causes of metabolic syndrome (MetS), is an increasingly common health and economic problem worldwide, and one of the major risk factors for developing type 2 diabetes and cardiovascular disease. Chronic, low-grade inflammation is associated with MetS and obesity. A dominant type 2/anti-inflammatory response is required for metabolic homeostasis within adipose tissue: during obesity, this response is replaced by infiltrating, inflammatory macrophages and T cells. Helminths and certain protozoan parasites are able to manipulate the host immune response towards a TH2 immune phenotype that is beneficial for their survival and there is emerging data that there is an inverse correlation between the incidence of MetS and helminth infections, suggesting that, as with autoimmune and allergic diseases, helminths may play a protective role against MetS disease...
January 9, 2017: Parasite Immunology
https://www.readbyqxmd.com/read/28040482/schistosoma-antigens-downregulate-cxcl9-production-by-pbmc-of-htlv-1-infected-individuals
#19
Luciane Mota Lima, Luciana Santos Cardoso, Silvane Braga Santos, Ricardo Riccio Oliveira, Sérgio Costa Oliveira, Alfredo Miranda Góes, Alex Loukas, Maria Ilma Araujo
: HTLV-1 is the causal agent of Adult T cell Leukemia/lymphoma (ATLL) and HTLV-1-associated Myelopathy/Tropical Spastic Paraparesis (HAM/TSP). The immune response to HTLV-1-infection is polarized to the Th1-type, and the presence of CXCL9/CXCL10 chemokines may lead to an increase in the recruitment of pro-inflammatory molecules in spinal cord tissue, contributing to the damage observed in the development of HAM/TSP. It has been observed that in chronic helminth-infections, such as schistosomiasis, there is a deviation toward the Th2/regulatory immune response...
March 2017: Acta Tropica
https://www.readbyqxmd.com/read/28033666/response-letter-to-letter-to-the-editor-regarding-article-entitled-what-should-be-taken-into-account-during-study-on-immunoregulatory-effects-of-helminths-a-critical-analyzing-on-downregulation-of-immune-responses-in-asthmatic-patients-by-es-products-of-marshallagia
#20
Farahzad Jabbari Azad, Fatemeh Kiaee, Abdorahim Rezaei, Reza Farid Hosseini, Nushinmehr Soleimani, Hassan Borji
No abstract text is available yet for this article.
December 29, 2016: Clinical Respiratory Journal
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