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Molecular allergen

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https://www.readbyqxmd.com/read/29778490/the-molecular-allergology-of-subtropical-grass-pollen
#1
Thina Kailaivasan, Janet M Davies
Grass pollens are amongst the most important aeroallergen sources world-wide triggering allergic rhinoconjunctivitis and asthma in sensitised patients. Much of what we know about the allergen components of grasses is informed by research on pollen of temperate (Pooideae) species that are abundant in the temperate climate zones. However, climate changes are altering the biogeographical distribution as well as timing and allergenicity of grass pollens. This provides an impetus for better understanding of the contribution of subtropical subfamilies of grasses to pollen allergy globally...
May 16, 2018: Molecular Immunology
https://www.readbyqxmd.com/read/29772494/effects-of-ceftriaxone-induced-intestinal-dysbacteriosis-on-regulatory-t-cells-validated-by-anaphylactic-mice
#2
Xia Luo, Zengfeng Pan, Shuang Luo, Qi Liu, Shaowei Huang, Guanghua Yang, Feifei Nong, Yajun Fu, Xiangliang Deng, Lian Zhou
Both probiotics and pathogens in the human gut express pathogen-associated molecular patterns (PAMPs) and die with the release of endotoxin and bacterial DNA, which can stimulate our immune system and cause immune reaction. However, it's interesting and fascinating to address why the normal intestinal flora will not generate immunological rejection like the pathogen does. By investigating the changes in cells and molecules relevant to immune tolerance in mice with ceftriaxone-induced dysbacteriosis, our study discovered that both the Evenness indexes and Shannon Wiener index of intestinal flora showed a decrease in dysbacteriosis mice...
May 14, 2018: International Immunopharmacology
https://www.readbyqxmd.com/read/29771985/another-cat-and-mouse-game-deciphering-the-evolution-of-the-scgb-superfamily-and-exploring-the-molecular-similarity-of-major-cat-allergen-fel-d-1-and-mouse-abp-using-computational-approaches
#3
Rajesh Durairaj, Patrick Pageat, Cécile Bienboire-Frosini
The mammalian secretoglobin (SCGB) superfamily contains functionally diverse members, among which the major cat allergen Fel d 1 and mouse salivary androgen-binding protein (ABP) display similar subunits. We searched for molecular similarities between Fel d 1 and ABP to examine the possibility that they play similar roles. We aimed to i) cluster the evolutionary relationships of the SCGB superfamily; ii) identify divergence patterns, structural overlap, and protein-protein docking between Fel d 1 and ABP dimers; and iii) explore the residual interaction between ABP dimers and steroid binding in chemical communication using computational approaches...
2018: PloS One
https://www.readbyqxmd.com/read/29768397/lipopolysaccharide-exposure-alleviates-asthma-in-mice-by-regulating-th1-th2-and-treg-th17-balance
#4
Fengxia Ding, Zhou Fu, Bo Liu
BACKGROUND It is generally believed that endotoxin exposure exacerbates risk of developing asthmatic symptoms. However, recent studies have indicated that prior bacterial exposure may prevent future symptoms of asthma. Here, we evaluated the influence of pre-exposure to different concentrations of lipopolysaccharide (LPS) to subsequent ovalbumin (OVA) allergen sensitization and challenge. MATERIAL AND METHODS Four-week-old Balb/c mice were treated intranasally with varying concentrations of LPS (1 ug, 10 ug, and 100 ug) or sterile PBS for 10 days, then 2 weeks later they were exposed to OVA...
May 16, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29758985/ultrasonic-pretreatment-combined-with-dry-state-glycation-reduced-the-ige-igg-binding-ability-of-%C3%AE-lactalbumin-revealed-by-high-resolution-mass-spectrometry
#5
Jun Liu, Zong-Cai Tu, Guang-Xian Liu, Chen-di Niu, Hong-Lin Yao, Hui Wang, Xiao-Mei Sha, Yan-Hong Shao, Igor A Kaltashov
Bovine α-lactalbumin (α-LA) is one of major food allergens in cow's milk. The present work sought to research the effects of ultrasonic pretreatment combined with dry heating-induced glycation between α-LA and galactose on the IgE/IgG-binding ability and glycation extent of α-LA, which determined by inhibition ELISA and high-resolution mass spectrometry respectively. The IgE/IgG-binding ability of glycated α-LA were significantly decreased as a result of ultrasonic pretreatment, while average molecular weight, incorporation ratio (IR) value, the location and number of glycation site, and degree of substitution per peptide (DSP) value was elevated...
May 14, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29757238/the-initiation-of-th2-immunity-towards-food-allergens
#6
REVIEW
Yosef Ellenbogen, Rodrigo Jiménez-Saiz, Paul Spill, Derek K Chu, Susan Waserman, Manel Jordana
In contrast with Th1 immune responses against pathogenic viruses and bacteria, the incipient events that generate Th2 responses remain less understood. One difficulty in the identification of universal operating principles stems from the diversity of entities against which cellular and molecular Th2 responses are produced. Such responses are launched against harmful macroscopic parasites and noxious substances, such as venoms, but also against largely innocuous allergens. This suggests that the established understanding about sense and recognition applied to Th1 responses may not be translatable to Th2 responses...
May 12, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29755919/molecular-phylogenetic-species-in-alternaria-pathogens-infecting-pistachio-and-wild-relatives
#7
Hilal Ozkilinc, Unal Sevinc
Many important pathogens of crops worldwide are members of section Alternaria within the genus Alternaria . Representative species in this section such as Alternaria alternata, Alternaria tenuissima , and Alternaria arborescens show high variability, intermediate characters and plasticity in morphological features, which makes species identification difficult. The aim of this study was to characterize Alternaria species associated with pistachio and wild relatives in Turkey using molecular phylogenetics. One hundred isolates of Alternaria spp...
May 2018: 3 Biotech
https://www.readbyqxmd.com/read/29755469/urinary-peptides-as-a-novel-source-of-t-cell-allergen-epitopes
#8
Ricardo da Silva Antunes, John Pham, Curtis McMurtrey, William H Hildebrand, Elizabeth Phillips, Simon Mallal, John Sidney, Paula Busse, Bjoern Peters, Véronique Schulten, Alessandro Sette
Mouse allergy in both laboratory workers and in inner-city children is associated with allergic rhinitis and asthma, posing a serious public health concern. Urine is a major source of mouse allergens, as mice spray urine onto their surroundings, where the proteins dry up and become airborne on dust particles. Here, we tested whether oligopeptides that are abundant in mouse urine may contribute to mouse allergic T cell response. Over 1,300 distinct oligopeptides were detected by mass spectrometry analysis of the low molecular weight filtrate fraction of mouse urine (LoMo)...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29754191/the-unique-molecular-signatures-of-contact-dermatitis-and-implications-for-treatment
#9
REVIEW
Alexandra Leonard, Emma Guttman-Yassky
Irritant contact dermatitis (ICD) and allergic contact dermatitis (ACD) are common skin disorders that are characterized by inflammation, oozing, crusting, and pruritus. Atopic dermatitis (AD) is an inflammatory skin disease characterized by immune and barrier abnormalities and is additionally a risk factor for acquiring ICD and ACD. New work on allergic sensitization to common allergens (e.g., nickel and fragrance) in human skin has shown that different allergens have distinct molecular fingerprinting. For example, nickel promotes strong Th1/Th17 polarization, whereas fragrance allergy causes Th2/Th22 skewing, which is similar to the phenotype of AD...
May 12, 2018: Clinical Reviews in Allergy & Immunology
https://www.readbyqxmd.com/read/29753831/medical-and-dietary-management-of-eosinophilic-esophagitis
#10
REVIEW
Quan M Nhu, Seema S Aceves
OBJECTIVE: Eosinophilic esophagitis (EoE) is a disease of chronic, allergen-driven, T-helper 2 (Th2) immune-mediated inflammation that progresses to fibrostenosis of the esophagus if left untreated. There are currently no FDA-approved drugs for the treatment of EoE. This review focuses on medical and dietary management of EoE. DATA SOURCES: Manuscripts on EoE treatments are identified on PubMed. STUDY SELECTIONS: Original research, randomized control trials, retrospective studies, meta-analyses, case series, and on occasions, case reports of high relevance, are selected and reviewed...
May 10, 2018: Annals of Allergy, Asthma & Immunology
https://www.readbyqxmd.com/read/29743964/extended-ige-profile-based-on-an-allergen-macroarray-a-novel-tool-for-precision-medicine-in-allergy-diagnosis
#11
Enrico Heffler, Francesca Puggioni, Silvia Peveri, Marcello Montagni, Giorgio Walter Canonica, Giovanni Melioli
Background: Precision medicine (PM) is changing the scope of allergy diagnosis and treatment. An in vitro IgE assay, a prototype PM method, was developed in the sixties and has garnered increasing interest because of the introduction of recombinant components in the test. More recently, microarrays of allergen components have significantly improved the ability to describe the IgE profile. Aim of this study was to evaluate the characteristics of the newly developed Allergy Explorer (ALEX), a macroarray containing both extracted "whole" allergens and molecular components...
2018: World Allergy Organization Journal
https://www.readbyqxmd.com/read/29734356/microbiota-epitope-similarity-either-dampens-or-enhances-the-immunogenicity-of-disease-associated-antigenic-epitopes
#12
Sebastian Carrasco Pro, Cecilia S Lindestam Arlehamn, Sandeep K Dhanda, Chelsea Carpenter, Mikaela Lindvall, Ali A Faruqi, Clark A Santee, Harald Renz, John Sidney, Bjoern Peters, Alessandro Sette
The microbiome influences adaptive immunity and molecular mimicry influences T cell reactivity. Here, we evaluated whether the sequence similarity of various antigens to the microbiota dampens or increases immunogenicity of T cell epitopes. Sets of epitopes and control sequences derived from 38 antigenic categories (infectious pathogens, allergens, autoantigens) were retrieved from the Immune Epitope Database (IEDB). Their similarity to microbiome sequences was calculated using the BLOSUM62 matrix. We found that sequence similarity was associated with either dampened (tolerogenic; e...
2018: PloS One
https://www.readbyqxmd.com/read/29731005/molecular-aspects-of-allergens-and-allergy
#13
Rudolf Valenta, Alexander Karaulov, Verena Niederberger, Pia Gattinger, Marianne van Hage, Sabine Flicker, Birgit Linhart, Raffaela Campana, Margarete Focke-Tejkl, Mirela Curin, Julia Eckl-Dorna, Christian Lupinek, Yvonne Resch-Marat, Susanne Vrtala, Irene Mittermann, Victoria Garib, Musa Khaitov, Peter Valent, Winfried F Pickl
Immunoglobulin E (IgE)-associated allergy is the most common immune disorder. More than 30% of the population suffer from symptoms of allergy which are often severe, disabling, and life threatening such as asthma and anaphylaxis. Population-based birth cohort studies show that up to 60% of the world population exhibit IgE sensitization to allergens, of which most are protein antigens. Thirty years ago the first allergen-encoding cDNAs have been isolated. In the meantime, the structures of most of the allergens relevant for disease in humans have been solved...
2018: Advances in Immunology
https://www.readbyqxmd.com/read/29724542/the-quest-for-bacterial-allergens
#14
REVIEW
Maria Nordengrün, Stephan Michalik, Uwe Völker, Barbara M Bröker, Lidia Gómez-Gascón
Allergies are complex diseases featuring local tissue inflammation, which is characterized by an exaggerated type 2 immune response to environmental compounds known as allergens. Pollens, environmental fungi, and house dust mites are examples of common allergens. Bacteria have a dual role in allergy. Usually, they are associated with protection, however, certain bacterial species promote the development and exacerbation of allergic inflammation. Notably, IgE antibodies specific for bacterial antigens are found in the sera of allergic individuals...
April 26, 2018: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/29717535/structural-basis-for-nucleotide-recognition-by-the-ectoenzyme-cd203c
#15
Alexei Gorelik, Antsa Randriamihaja, Katalin Illes, Bhushan Nagar
The ecto-nucleotide pyrophosphatase/phosphodiesterase (NPP) enzyme family modulates purinergic signaling by degrading extracellular nucleotides. CD203c (NPP3, ENPP3) regulates the inflammatory response of basophils via ATP hydrolysis and is a marker for allergen sensitivity on the surface of these cells. Multiple other roles and substrates have also been proposed for this protein. In order to gain insight into its molecular functions, we determined the crystal structure of human NPP3 as well as its complex with an ATP analog...
May 2, 2018: FEBS Journal
https://www.readbyqxmd.com/read/29715467/diversity-of-peptidic-and-proteinaceous-toxins-from-social-hymenoptera-venoms
#16
José Roberto Aparecido Dos Santos-Pinto, Amilcar Perez-Riverol, Alexis Musacchio Lasa, Mario Sergio Palma
Among venomous animals, Hymenoptera have been suggested as a rich source of natural toxins. Due to their broad ecological diversity, venom from Hymenoptera insects (bees, wasps and ants) have evolved differentially thus widening the types and biological functions of their components. To date, insect toxinology analysis have scarcely uncovered the complex composition of bee, wasp and ant venoms which include low molecular weight compounds, highly abundant peptides and proteins, including several allergens. In Hymenoptera, these complex mixtures of toxins represent a potent arsenal of biological weapons that are used for self-defense, to repel intruders and to capture prey...
April 28, 2018: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29713601/a-novel-b-and-helper-t-cell-epitopes-based-prophylactic-vaccine-against-echinococcus-granulosus
#17
Mohammad M Pourseif, Gholamali Moghaddam, Hossein Daghighkia, Ahmad Nematollahi, Yadollah Omidi
Introduction: In this study, we targeted the worm stage of Echinococcus granulosus to design a novel multi-epitope B- and helper T-cell based vaccine construct for immunization of dogs against this multi-host parasite. Methods: The vaccine was designed based on the local Eg14-3-3 antigen (Ag). DNA samples were extracted from the protoscoleces of the infected sheep's liver, and then subjected to the polymerase chain reaction (PCR) with 14-3-3 specific forward and reverse primers. For the vaccine designing, several in silico steps were undertaken...
2018: BioImpacts: BI
https://www.readbyqxmd.com/read/29685461/meat-allergy-and-allergens
#18
Jeffrey M Wilson, Thomas A E Platts-Mills
IgE-mediated hypersensitivity to ingested animal products, including both mammalian and avian sources, is increasingly appreciated as an important form of food allergy. Traditionally described largely in children, it is now clear that allergy to meat (and animal viscera) impacts both children and adults and represents a heterogeneous group of allergic disorders with multiple distinct syndromes. The recognition of entities such as pork-cat syndrome and delayed anaphylaxis to red meat, i.e- the α-Gal syndrome, have shed light on fundamental, and in some cases newly appreciated, features of allergic disease...
April 20, 2018: Molecular Immunology
https://www.readbyqxmd.com/read/29669265/modification-of-ige-binding-to-%C3%AE-s1-casein-by-proteolytic-activity-of-enterococcus-faecium-isolated-from-iranian-camel-milk-samples
#19
Reihane Kordesedehi, Asghar Taheri-Kafrani, Mohammad Rabbani-Khorasgani, Rezvan Kazemi, Daniel Mutangadura, Thomas Haertle
Milk is a perfect source of nutrients for neonates. When breast feeding cannot be done, an infant's alimentation is usually initiated to cow's milk, among the primary foods. It has been reported that about 2.5% of juveniles under the age of 3 years manifest allergic reactions to cow's milk proteins. Among the cow's milk proteins, casein fractions are considered as the strongest allergenic proteins. The proteolytic enzymes of lactic acid bacteria (LAB), during fermentation of dairy products, can break down milk proteins especially caseins and subsequently reduce the immune reactivity of allergenic proteins...
April 15, 2018: Journal of Biotechnology
https://www.readbyqxmd.com/read/29650229/allergen-component-analysis-as-a-tool-in-the-diagnosis-and-management-of-occupational-allergy
#20
Monika Raulf
We are now in the epoch of "molecular allergology" and numerous clinically relevant allergenic molecules are available improving the performance of in vitro allergen tests and allergen detection methods. This review is focusing on characterized occupational allergens and their implementation into the in vitro diagnosis for occupational allergy and in allergen detection methods. More than 400 occupational agents are identified and documented as being 'respiratory sensitizers', but currently only a limited number of them are characterized on the molecular level and available for routine diagnosis as native or recombinant allergens...
April 9, 2018: Molecular Immunology
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