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https://www.readbyqxmd.com/read/27916121/development-of-an-indirect-elisa-for-the-determination-of-ethyl-carbamate-in-chinese-rice-wine
#1
Lin Luo, Hong-Tao Lei, Jin-Yi Yang, Gong-Liang Liu, Yuan-Ming Sun, Wei-Dong Bai, Hong Wang, Yu-Dong Shen, Sui Chen, Zhen-Lin Xu
The widespread occurrence of ethyl carbamate (EC, 89.09 Da), a group 2A carcinogen, in fermented foods and alcoholic beverages has raised worldwide public health concern. Immunoassay for EC is unavailable due to the simple and small structure of EC. In this work, an initial attempt to produce antibody specific for EC, by using 4-((ethoxycarbonyl)amino)butanoic acid as hapten, was made but failed. However, since EC can easily react with 9-xanthydrol to form xanthyl ethyl carbamate (XEC), two haptens based on XEC structure were designed and synthesized...
January 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27896835/contact-sensitization-to-limonene-and-linalool-hydroperoxides-in-spain-a-geidac-prospective-study
#2
Gustavo Deza, Begoña García-Bravo, Juan F Silvestre, Maria A Pastor-Nieto, Ricardo González-Pérez, Felipe Heras-Mendaza, Pedro Mercader, Virginia Fernández-Redondo, Bo Niklasson, Ana M Giménez-Arnau
BACKGROUND: Limonene and linalool are common fragrance terpenes widely used in cosmetic, household and hygiene products. Their primary oxidation products formed after air exposure, the hydroperoxides, have been recognized as important contact haptens. OBJECTIVES: To investigate the prevalence of contact allergy to hydroperoxides of limonene (Lim-OOHs) and hydroperoxides of linalool (Lin-OOHs) in Spain, and to define the optimal concentration for screening in consecutive patients...
November 29, 2016: Contact Dermatitis
https://www.readbyqxmd.com/read/27887954/the-short-chain-fatty-acid-sodium-butyrate-functions-as-a-regulator-of-the-skin-immune-system
#3
Agatha Schwarz, Anika Bruhs, Thomas Schwarz
There is evidence that gut commensal microbes affect the mucosal immune system via expansion of regulatory T cells (Treg) in the colon. This is mediated via short-chain fatty acids (SCFA), bacterial metabolites generated during fiber fermentation, which include butyrate, propionate and acetate. We postulated that SCFA produced by commensal skin bacteria may also activate resident skin Treg, the activity of which is diminished in certain inflammatory dermatoses. Sodium butyrate (SB) either injected s.c. or applied topically onto the ears of hapten-sensitized mice significantly reduced the contact hypersensitivity reaction...
November 22, 2016: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/27886248/ultrasensitive-rapid-and-inexpensive-detection-of-dna-using-paper-based-lateral-flow-assay
#4
Miriam Jauset-Rubio, Markéta Svobodová, Teresa Mairal, Calum McNeil, Neil Keegan, Ayman Saeed, Mohammad Nooredeen Abbas, Mohammad S El-Shahawi, Abdulaziz S Bashammakh, Abdulrahman O Alyoubi, Ciara K O Sullivan
Sensitive, specific, rapid, inexpensive and easy-to-use nucleic acid tests for use at the point-of-need are critical for the emerging field of personalised medicine for which companion diagnostics are essential, as well as for application in low resource settings. Here we report on the development of a point-of-care nucleic acid lateral flow test for the direct detection of isothermally amplified DNA. The recombinase polymerase amplification method is modified slightly to use tailed primers, resulting in an amplicon with a duplex flanked by two single stranded DNA tails...
November 25, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27885153/karl-otto-landsteiner-1868-1943-physician-biochemist-immunologist
#5
Armond S Goldman, Frank C Schmalsteig
Karl Landsteiner applied the sciences of biochemistry, pathology, microbiology, and immunology in medical research to great success during the first half of the 20th century. Although he is principally known for elucidating the major blood group antigens A and B and their isoantibodies for which he was awarded the Nobel Prize in Physiology or Medicine, Landsteiner made many other important medical discoveries. In that respect, he ascertained that paralytic poliomyelitis was due to a virus, the pancreas was damaged in cystic fibrosis, simple chemicals called haptens were able to combine with antibodies, and the Rh antigen that was later found to be the principal cause of hemolytic anemia of the newborn was found in most humans...
November 24, 2016: Journal of Medical Biography
https://www.readbyqxmd.com/read/27874102/development-and-comparative-study-of-chemosynthesized-antigen-and-mimotope-based-immunoassays-for-class-specific-analysis-of-o-o-dimethyl-organophosphorus-pesticides
#6
Fengchun Zhao, Huimin Wang, Xiao Han, Zhengyou Yang
The multi-residue determination of organophosphorus pesticides (OPs) is an important task due to the wide application and high toxicity of OPs. However, there is no promising immunoassay to monitor the multi-residue of O,O-dimethyl OPs. In this study, a monoclonal antibody (mAb) against a generic hapten of O,O-dimethyl OPs (O,O-dimethyl O-(3-carboxyphenyl)phosphorothioate) was prepared. To develop an effective class-specific immunoassay, two strategies were performed to select the appropriate coating antigen or competing antigen...
November 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27866079/multimodal-plasmonic-biosensing-nanostructures-prepared-by-dna-directed-immobilization-of-multifunctional-dna-gold-nanoparticles
#7
Nuria Tort, J-Pablo Salvador, M-Pilar Marco
Biofunctional multimodal plasmonic nanostructures suitable for multiplexed localized surface plasmon resonance (LSPR) biosensing have been created by DNA-directed immobilization (DDI) of two distinct multifunctional biohybrid gold nanoparticles. Gold nanoparticles (AuNP) of distinct sizes, and therefore showing distinct plasmon resonant peaks (RP), have been biofunctionalized and codified with two different single stranded-DNA (ssDNA) chains. One of these oligonucleotide chains has been specifically designed to direct each AuNP to a distinct location of the surface of a DNA microarray chip through specific hybridization with complementary oligonucleotide strands...
November 11, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27864913/human-secretory-igm-antibodies-activate-human-complement-and-offer-protection-at-mucosal-surface
#8
Terje E Michaelsen, Sidsel Emilsen, Randi H Sandin, Beathe Kiland Granerud, Diane Bratlie, Oistein Ihle, Inger Sandlie
IgM molecules circulate in serum as large polymers, mainly pentamers, which can be transported by the poly-Ig receptor (pIgR) across epithelial cells to mucosal surfaces and released as secretory IgM (SIgM). The mucosal SIgM molecules have non-covalently attached secretory component (SC), which is the extracellular part of pIgR which is cleaved from the epithelial cell membrane. Serum IgM antibodies do not contain SC, and have previously been shown to make a conformational change from "a star" to a "staple" conformation upon reaction with antigens on a cell surface, enabling them to activate complement...
November 16, 2016: Scandinavian Journal of Immunology
https://www.readbyqxmd.com/read/27862476/analysis-of-the-binding-loops-configuration-and-surface-adaptation-of-different-crystallized-single-domain-antibodies-in-response-to-various-antigens
#9
Mohammed M Al Qaraghuli, Valerie A Ferro
Monoclonal antibodies have revolutionized the biomedical field through their ubiquitous utilization in different diagnostics and therapeutic applications. Despite this widespread use, their large size and structural complexity have limited their versatility in specific applications. The antibody variable region that is responsible for binding antigen is embodied within domains that can be rescued individually as single-domain antibody (sdAb) fragments. Because of the unique characteristics of sdAbs, such as low molecular weight, high physicochemical stability, and the ability to bind antigens inaccessible to conventional antibodies, they represent a viable alternative to full-length antibodies...
November 16, 2016: Journal of Molecular Recognition: JMR
https://www.readbyqxmd.com/read/27861994/detection-of-drug-responsive-b-lymphocytes-and-anti-drug-igg-in-patients-with-%C3%AE-lactam-hypersensitivity
#10
Mohammed O Amali, Andrew Sullivan, Rosalind E Jenkins, John Farrell, Xiaoli Meng, Lee Faulkner, Paul Whitaker, Daniel Peckham, B Kevin Park, Dean J Naisbitt
BACKGROUND: Delayed-type β-lactam hypersensitivity develops in subset of patients. The cellular immunological processes that underlie the drug-specific response have been described; however, little is known about involvement of the humoral immune system. Thus, the aim of this study was to utilize piperacillin hypersensitivity as an exemplar to (1) develop cell culture methods for the detection of drug-specific B cell responses, (2) characterize drug-specific IgG subtypes and (3) assess reactivity of IgG antibodies against proteins modified to different levels with piperacillin haptens...
November 15, 2016: Allergy
https://www.readbyqxmd.com/read/27857212/gr-independent-down-modulation-on-gm-csf-bone-marrow-derived-dendritic-cells-by-the-selective-glucocorticoid-receptor-modulator-compound-a
#11
Andres E Barcala Tabarrozzi, Luz Andreone, Julie Deckers, Carla N Castro, María L Gimeno, Laura Ariolfo, Paula M Berguer, María Antunica-Noguerol, Ana C Liberman, Sabine Vettorazzi, Jan P Tuckermann, Karolien De Bosscher, Marcelo J Perone
Dendritic cells (DC) initiate the adaptive immune response. Glucocorticoids (GCs) down-modulate the function of DC. Compound A (CpdA, (2-(4-acetoxyphenyl)-2-chloro-N-methyl-ethylammonium chloride) is a plant-derived GR-ligand with marked dissociative properties. We investigated the effects of CpdA on in vitro generated GM-CSF-conditioned bone marrow-derived DC (BMDC). CpdA-exposed BMDC exhibited low expression of cell-surface molecules and diminution of the release of proinflammatory cytokines upon LPS stimulation; processes associated with BMDC maturation and activation...
November 18, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27805826/the-use-of-peptide-reactivity-assays-for-skin-sensitisation-hazard-identification-and-risk-assessment
#12
REVIEW
G Frank Gerberick
Over the past 20 years or more, investigators have been developing non-animal test methods for use in assessing the skin sensitisation potential of chemicals. In parallel with this effort, the key biological events of skin sensitisation have been well-characterised in an Adverse Outcome Pathway (AOP) proposed by the Organisation for Economic Co-operation and Development (OECD). The key molecular initiating event of this AOP is haptenation or covalent modification of epidermal proteins. In this review, the strengths and limitations of the Direct Peptide Reactivity Assay (DPRA) are described, and the more recently developed Peroxidase Peptide Reactivity Assay (PPRA)...
October 2016: Alternatives to Laboratory Animals: ATLA
https://www.readbyqxmd.com/read/27787718/histamine-and-histamine-receptors-in-allergic-dermatitis
#13
Hiroshi Ohtsu, Masahiro Seike
In this chapter we will first introduce the pathophysiological process of several skin diseases including allergic dermatitis, a common skin disease, including chronic allergic contact dermatitis (CACD), and atopic dermatitis (AD). In CACD and AD patients, repeated skin exposure to antigens contributes to the development of chronic eczematous lesions. Repeated application of haptens on mice allows emulation of the development of CACD in humans. Further, we will focus on H1, H2, and H4 histamine receptors and their effects on CACD and AD...
October 28, 2016: Handbook of Experimental Pharmacology
https://www.readbyqxmd.com/read/27775332/how-reactive-metabolites-induce-an-immune-response-that-sometimes-leads-to-an-idiosyncratic-drug-reaction
#14
Tiffany Elizabeth Cho, Jack Uetrecht
Little is known with certainty about the mechanisms of idiosyncratic drug reactions (IDRs); however, there is substantive evidence that reactive metabolites are involved in most, but not all, IDRs. In addition, evidence also suggests that most IDRs are immune mediated. That raises the question of how reactive metabolites induce an immune response that can lead to an IDR. The dominant hypotheses are the hapten and danger hypotheses. These are complementary hypotheses: a reactive metabolite can act as a hapten to produce neoantigens, and it can also cause cell damage leading to the release of danger-associated molecular pattern molecules that activate antigen presenting cells...
October 24, 2016: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/27751866/allergy-inducing-chromium-compounds-trigger-potent-innate-immune-stimulation-via-ros-dependent-inflammasome-activation
#15
Christian Adam, Jonas Wohlfarth, Maike Haußmann, Helga Sennefelder, Annette Rodin, Mareike Maler, Stefan F Martin, Matthias Goebeler, Marc Schmidt
Chromium allergy is a common occupational skin disease mediated by chromium (VI)-specific T cells that induce delayed-type hypersensitivity in sensitized individuals. Additionally, chromium (VI) can act as irritant. Both responses critically require innate immune activation, but if and how chromium (VI) elicits this signal is currently unclear.Using human monocytes, primary human keratinocytes and murine dendritic cells we show that chromium (VI) compounds fail to trigger direct proinflammatory activation but potently induce processing and secretion of IL-1β...
October 14, 2016: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/27743554/a-highly-sensitive-immunoassay-for-atrazine-based-on-covalently-linking-the-small-molecule-hapten-to-a-urea-glutaraldehyde-network-on-a-polystyrene-surface
#16
Na Sai, Wenjing Sun, Yuntang Wu, Zhong Sun, Guanggui Yu, Guowei Huang
A new enzyme-linked immunosorbent assay (ELISA) for atrazine was developed based on covalent bonding of the small molecule hapten, 2-mercaptopropionic acid-4-ethylamino-6-isopropylamino-1,3,5-triazine (MPA-atrazine), to urea-glutaraldehyde (UGA)-treated microtiter plates. In this assay, the microtiter plate surface was treated with the UGA network to both introduce amino groups, which were used to cross-link with the hapten carboxylate groups, and efficiently prevent non-specific adsorption of antibodies, which successfully eliminated the time-consuming routine blocking step...
October 12, 2016: International Immunopharmacology
https://www.readbyqxmd.com/read/27730559/purification-of-antibodies-using-affinity-chromatography
#17
Elaine Darcy, Paul Leonard, Jenny Fitzgerald, Martin Danaher, Hui Ma, Richard O'Kennedy
Affinity chromatography permits the isolation of a target analyte from a complex mixture and can be utilized to purify proteins, carbohydrates, drugs, haptens, or any analyte of interest once an affinity pair is available. It involves the exploitation of specific interactions between a binding affinity pair, such as those between an antibody and its associated antigen, or between any ligand and its associated binding receptor/protein. With the discovery of protein A in 1970, and, subsequently protein G and L, immuno-affinity chromatography has grown in popularity and is now the standard methodology for the purification of antibodies which may be implemented for a selection of different applications such as immunodiagnostics...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27718238/electrophilic-nitro-fatty-acids-suppress-allergic-contact-dermatitis-in-mice
#18
A R Mathers, C D Carey, M E Killeen, J A Diaz-Perez, S R Salvatore, F J Schopfer, B A Freeman, L D Falo
BACKGROUND: Reactions between nitric oxide (NO), nitrite (NO2-), and unsaturated fatty acids give rise to electrophilic nitro-fatty acids (NO2 -FAs), such as nitro oleic acid (OA-NO2 ) and nitro linoleic acid (LNO2 ). Endogenous electrophilic fatty acids (EFAs) mediate anti-inflammatory responses by modulating metabolic and inflammatory signal transduction reactions. Hence, there is considerable interest in employing NO2 -FAs and other EFAs for the prevention and treatment of inflammatory disorders...
October 8, 2016: Allergy
https://www.readbyqxmd.com/read/27690421/flexible-method-for-conjugation-of-phenol-lignin-model-compounds-to-carrier-proteins
#19
Ruili Gao, Fachuang Lu, Yimin Zhu, Michael G Hahn, John Ralph
Linking lignin model compounds to carrier proteins is required in order either to raise antibodies to them or to structurally screen antibodies raised against lignins or models. We describe a flexible method to link phenolic compounds of interest to cationic bovine serum albumin (cBSA) without interfering with their important structural features. With the guaiacylglycerol-β-guaiacyl ether dimer, for example, the linking was accomplished in 89% yield with the number of dimers per carrier protein being as high as 50; NMR experiments on a 15N- and 13C-labeled conjugation product indicated that 13 dimers were added to the native lysine residues and the remainder (~37) to the amine moieties on the ethylenediamine linkers added to BSA; ~32% of the available primary amine groups on cBSA were therefore conjugated to the hapten...
October 3, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27689879/mass-spectrometric-and-functional-aspects-of-drug-protein-conjugation
#20
Arun Tailor, James C Waddington, Xiaoli Meng, B Kevin Park
The covalent binding of drugs (metabolites) to proteins to form drug-protein adducts can have an adverse effect on the body. These adducts are thought to be responsible for idiosyncratic drug reactions including severe drug hypersensitivity reactions. Major advances in proteomics technology have allowed for the identification and quantification of target proteins for certain drugs. Human serum albumin (HSA) and Hb have been identified as accessible targets and potential biomarkers for drug-protein adducts formation, for numerous drugs (metabolites) including β-lactam antibiotics, reactive drug metabolites such as quinone imines (acetaminophen) and acyl glucuronides (diclofenac), and covalent inhibitors (neratinib)...
September 30, 2016: Chemical Research in Toxicology
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