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Antigen array

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https://www.readbyqxmd.com/read/28922578/identification-of-a-tetanus-toxin-specific-epitope-in-single-amino-acid-resolution
#1
Andrea Palermo, Laura K Weber, Simone Rentschler, Awale Isse, Martyna Sedlmayr, Karin Herbster, Volker List, Jürgen Hubbuch, Felix F Löffler, Alexander Nesterov-Müller, Frank Breitling
Vaccinations are among the most potent tools to fight infectious diseases. However, cross-reactions are an ongoing problem and there is an urgent need to fully understand the mechanisms of the immune response. For the development of a methodological workflow, the linear epitopes in the immune response to the tetanus toxin is investigated in sera of 19 vaccinated Europeans applying epitope mapping with peptide arrays. The most prominent epitope, appearing in nine different sera (923 IHLVNNESSEVIVHK937 ), is investigated in a substitution analysis to identify the amino acids that are crucial for the binding of the corresponding antibody species - the antibody fingerprint...
September 18, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28921602/human-leukocyte-antigen-variants-and-risk-of-hepatocellular-carcinoma-modified-by-hcv-genotypes-a-genome-wide-association-study
#2
Mei-Hsuan Lee, Yu-Han Huang, Hsuan-Yu Chen, Charles Seik-Soon Khor, Ya-Hsuan Chang, Yu-Ju Lin, Chin-Lan Jen, Sheng-Nan Lu, Hwai-I Yang, Nao Nishida, Masaya Sugiyama, Masashi Mizokami, Yong Yuan, Gibert L'Italien, Katsushi Tokunaga, Chien-Jen Chen
BACKGROUND & AIMS: We conducted a genome-wide association study (GWAS) to discover genetic variants associated with hepatitis C virus (HCV)-related hepatocellular carcinoma (HCC). METHODS: We genotyped 502 HCC cases and 749 non-HCC controls by using the Axiom(TM) -CHB genome-wide array. After identifying single nucleotide polymorphism (SNP) cluster located in the human leukocyte antigen region which were potentially associated with HCC, HLA-DQB1 genotyping was performed to analyze 994 anti-HCV seropositives collected in the period of 1991-2013 in a community-based cohort for evaluating long-term predictability of HLA variants for identifying the risk of HCC...
September 16, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28919737/bacterial-membrane-vesicles-as-novel-nanosystems-for-drug-delivery
#3
REVIEW
Sapna Jain, Jonathan Pillai
Bacterial membrane vesicles (BMVs) are closed spherical nanostructures that are shed naturally and ubiquitously by most bacterial species both in vivo and in vitro. Researchers have elucidated their roles in long-distance transport of a wide array of cargoes, such as proteins, toxins, antigens, virulence factors, microbicidal agents and antibiotics. Given that these natural carriers are important players in intercellular communication, it has been hypothesized that they are equally well attuned for transport and delivery of exogenous therapeutic cargoes...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28918480/sgs1-helicase-is-required-for-efficient-pcna-monoubiquitination-and-translesion-dna-synthesis-in-saccharomyces-cerevisiae
#4
Fangfang Li, Lindsay G Ball, Li Fan, Michelle Hanna, Wei Xiao
DNA-damage tolerance (DDT) is employed by eukaryotes to deal with replication blocks on the template strand, and is divided into two parallel pathways that are activated by sequential ubiquitination of proliferating cell nuclear antigen (PCNA) at the Lys164 residue. Rad6-Rad18-mediated PCNA monoubiquitination promotes translesion DNA synthesis (TLS) and the monoubiquitinated PCNA can be further polyubiquitinated by an Mms2-Ubc13-Rad5 complex, leading to error-free lesion bypass. We previously reported that the DNA helicase Sgs1 is required for error-free lesion bypass, probably through the double-Holliday junction migration and subsequent resolution...
September 16, 2017: Current Genetics
https://www.readbyqxmd.com/read/28915391/hepatitis-b-surface-antigen-incorporated-in-dissolvable-microneedle-array-patch-is-antigenic-and-thermostable
#5
Danielle Poirier, Frédéric Renaud, Vincent Dewar, Laurent Strodiot, Florence Wauters, Jim Janimak, Toshio Shimada, Tatsuya Nomura, Koki Kabata, Koji Kuruma, Takayuki Kusano, Masaki Sakai, Hideo Nagasaki, Takayoshi Oyamada
Alternatives to syringe-based administration are considered for vaccines. Intradermal vaccination with dissolvable microneedle arrays (MNA) appears promising in this respect, as an easy-to-use and painless method. In this work, we have developed an MNA patch (MNAP) made of hydroxyethyl starch (HES) and chondroitin sulphate (CS). In swines, hepatitis B surface antigen (HBsAg) formulated with the saponin QS-21 as adjuvant, both incorporated in HES-based MNAP, demonstrated the same level of immunogenicity as a commercially available aluminum-adjuvanted HBsAg vaccine, after two immunizations 28 days apart...
August 29, 2017: Biomaterials
https://www.readbyqxmd.com/read/28905952/detection-of-membrane-bound-and-soluble-antigens-by-magnetic-levitation
#6
Mikkel Schou Andersen, Emily Howard, Shulin Lu, Matthew Richard, Mark Gregory, Gordon Ogembo, Ofer Mazor, Pavel Gorelik, Nathan I Shapiro, Anish V Sharda, Ionita Ghiran
Magnetic levitation is a technique for measuring the density and the magnetic properties of objects suspended in a paramagnetic field. We describe a novel magnetic levitation-based method that can specifically detect cell membrane-bound and soluble antigens by measurable changes in levitation height that result from the formation of antibody-coated bead and antigen complex. We demonstrate our method's ability to sensitively detect an array of membrane-bound and soluble antigens found in blood, including T-cell antigen CD3, eosinophil antigen Siglec-8, red blood cell antigens CD35 and RhD, red blood cell-bound Epstein-Barr viral particles, and soluble IL-6, and validate the results by flow cytometry and immunofluorescence microscopy performed in parallel...
September 14, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28902877/purification-and-characterization-of-a-highly-specific-polyclonal-antibody-against-human-extracellular-signal-regulated-kinase-8-and-its-detection-in-lung-cancer
#7
Na-Li Cai, Andy T Y Lau, Fei-Yuan Yu, Dan-Dan Wu, Li-Juan Dai, Hai-Ying Mo, Chang-Min Lin, Yan-Ming Xu
Extracellular signal-regulated kinase 8 (ERK8), proposed as a novel potential therapeutic target for cancer, has been implicated in cell transformation, apoptosis, the protection of genomic integrity, and autophagy. To facilitate ERK8 research, a highly specific anti-ERK8 antibody is needed. In this article, we use the Immune Epitope Database and Analysis Resource online tool to predict B-cell epitopes of human ERK8 protein, and choose a 28 aa-peptide sequence to generate the GST-ERK8(28aa) fusion protein as the antigen for developing polyclonal antibody against ERK8...
2017: PloS One
https://www.readbyqxmd.com/read/28894225/a-signal-on-built-in-marker-electrochemical-aptasensor-for-human-prostate-specific-antigen-based-on-a-hairbrush-like-gold-nanostructure
#8
Naghmeh Sattarahmady, Amid Rahi, Hossein Heli
A green electrodeposition method was firstly employed for the synthesis of round hairbrush-like gold nanostructure in the presence of cadaverine as a size and shape directing additive. The nanostructure which comprised of arrays of nanospindles was then applied as a transducer to fabricate a signal-on built in-marker electrochemical aptasensor for the detection of human prostate-specific antigen (PSA). The aptasensor detected PSA with a linear concentration range of 0.125 to 128 ng mL(-1) and a limit of detection of 50 pg mL(-1)...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28878258/oxidative-damage-and-impairment-of-protein-quality-control-systems-in-keratinocytes-exposed-to-a-volatile-organic-compounds-cocktail
#9
Marlène Dezest, Mickael Le Bechec, Laurent Chavatte, Valérie Desauziers, Benoît Chaput, Jean-Louis Grolleau, Pascal Descargues, Carine Nizard, Sylvianne Schnebert, Sylvie Lacombe, Anne-Laure Bulteau
Compelling evidence suggests that volatile organic compounds (VOCs) have potentially harmful effects to the skin. However, knowledge about cellular signaling events and toxicity subsequent to VOC exposure to human skin cells is still poorly documented. The aim of this study was to focus on the interaction between 5 different VOCs (hexane, toluene, acetaldehyde, formaldehyde and acetone) at doses mimicking chronic low level environmental exposure and the effect on human keratinocytes to get better insight into VOC-cell interactions...
September 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28878081/foot-and-mouth-disease-virus-3c-protease-mutant-l127p-implications-for-fmd-vaccine-development
#10
Michael Puckette, Benjamin A Clark, Justin D Smith, Traci Turecek, Erica Martel, Lindsay Gabbert, Melia Pisano, William Hurtle, Juan M Pacheco, José Barrera, John G Neilan, Max Rasmussen
The foot-and-mouth disease virus (FMDV) afflicts livestock in more than 80 countries limiting food production and global trade. Production of foot-and-mouth disease (FMD) vaccines requires cytosolic expression of the FMDV 3C protease to cleave the P1 polyprotein into mature capsid proteins, but the FMDV 3C protease is toxic to host cells. To identify less toxic isoforms of the FMDV 3C protease, we screened 3C mutants for increased transgene output over wild-type 3C using a Gaussia luciferase reporter system...
September 6, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28876641/gene-and-protein-expression-profiling-of-pdac-tumours-obtained-from-black-south-african-patients-reveal-novel-potential-biomarkers
#11
E N Nweke, M N Ntwasa, M B Brand, J D Devar, M D Smith, G P Candy
BACKGROUND: Pancreatic cancer (PDAC) is a devastating cancer. It accounts for about 7% of cancer related deaths worldwide. During PDAC, several genes are altered. These alterations consequently lead to the progression of PDAC. Analysis of these alterations in the context of signalling pathways help in understanding the disease. METHOD: 18 Tissue (9 tumour, 9 normal) samples were obtained from Black South African stage I PDAC patients during the Whipple procedure...
June 2017: South African Journal of Surgery. Suid-Afrikaanse Tydskrif Vir Chirurgie
https://www.readbyqxmd.com/read/28865128/mechanisms-underlying-human-genetic-diversity-consequence-for-anti-graft-antibody-responses
#12
REVIEW
Roman Reindl-Schwaighofer, Andreas Heinzel, Lorenzo Signorini, Olivier Thaunat, Rainer Oberbauer
This review focuses on the emerging concept of genome-wide genetic variation as basis of an alloimmune response. Chronic antibody mediated rejection is the major cause of long-term graft loss and growing evidence supports the clinical relevance of HLA but also non-HLA related alloimmune responses. Several polymorphic gene products have been identified as minor histocompatibility antigens. The formation of donor specific alloantibodies is driven by indirect allorecognition of donor derived peptides representing a form of conventional T-cell response...
September 2, 2017: Transplant International: Official Journal of the European Society for Organ Transplantation
https://www.readbyqxmd.com/read/28861524/deep-sequencing-of-rna-from-blood-and-oral-swab-samples-reveals-the-presence-of-nucleic-acid-from-a-number-of-pathogens-in-patients-with-acute-ebola-virus-disease-and-is-consistent-with-bacterial-translocation-across-the-gut
#13
Miles W Carroll, Sam Haldenby, Natasha Y Rickett, Bernadett Pályi, Isabel Garcia-Dorival, Xuan Liu, Gary Barker, Joseph Akoi Bore, Fara Raymond Koundouno, E Diane Williamson, Thomas R Laws, Romy Kerber, Daouda Sissoko, Nóra Magyar, Antonino Di Caro, Mirella Biava, Tom E Fletcher, Armand Sprecher, Lisa F P Ng, Laurent Rénia, N'faly Magassouba, Stephan Günther, Roman Wölfel, Kilian Stoecker, David A Matthews, Julian A Hiscox
In this study, samples from the 2013-2016 West African Ebola virus outbreak from patients in Guinea with Ebola virus disease (EVD) were analyzed to discover and classify what other pathogens were present. Throat swabs were taken from deceased EVD patients, and peripheral blood samples were analyzed that had been taken from patients when they presented at the treatment center with acute illness. High-throughput RNA sequencing (RNA-seq) and bioinformatics were used to identify the potential microorganisms. This approach confirmed Ebola virus (EBOV) in all samples from patients diagnosed as acute positive for the virus by quantitative reverse transcription-PCR in deployed field laboratories...
July 2017: MSphere
https://www.readbyqxmd.com/read/28861090/dynamics-of-natural-killer-cells-cytotoxicity-in-microwell-arrays-with-connecting-channels
#14
Yuanhao Xu, Shufan Zhou, Yun Wah Lam, Stella W Pang
Natural killer (NK) cells serve an important role in immune system by recognizing and killing the potentially malignant cells without antigen sensitization, and could be promising in cancer therapy. We have designed and fabricated microwell arrays with microchannel connections in polydimethylsiloxane (PDMS) substrates to study the interaction dynamics of NK-92MI cells with MCF7 breast cancer cells using time-lapse imaging by fluorescence microscopy for 15 h. Although cell seeding density was the same, NK cell cytotoxicity was found to be higher in larger microwells, which is manifested as increased target death ratio from 13...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28861084/autoantibody-repertoire-in-apeced-patients-targets-two-distinct-subgroups-of-proteins
#15
Dmytro Fishman, Kai Kisand, Christina Hertel, Mike Rothe, Anu Remm, Maire Pihlap, Priit Adler, Jaak Vilo, Aleksandr Peet, Antonella Meloni, Katarina Trebusak Podkrajsek, Tadej Battelino, Øyvind Bruserud, Anette S B Wolff, Eystein S Husebye, Nicolas Kluger, Kai Krohn, Annamari Ranki, Hedi Peterson, Adrian Hayday, Pärt Peterson
High titer autoantibodies produced by B lymphocytes are clinically important features of many common autoimmune diseases. APECED patients with deficient autoimmune regulator (AIRE) gene collectively display a broad repertoire of high titer autoantibodies, including some which are pathognomonic for major autoimmune diseases. AIRE deficiency severely reduces thymic expression of gene-products ordinarily restricted to discrete peripheral tissues, and developing T cells reactive to those gene-products are not inactivated during their development...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28845964/array-based-rational-design-of-short-peptide-probe-derived-from-an-anti-tnt-monoclonal-antibody
#16
Mina Okochi, Masaki Muto, Kentaro Yanai, Masayoshi Tanaka, Takeshi Onodera, Jin Wang, Hiroshi Ueda, Kiyoshi Toko
Complementarity-determining regions (CDRs) are sites on the variable chains of antibodies responsible for binding to specific antigens. In this study, a short peptide probe for recognition of 2,4,6-trinitrotoluene (TNT), was identified by testing sequences derived from the CDRs of an anti-TNT monoclonal antibody. The major TNT-binding site in this antibody was identified in the heavy chain CDR3 by antigen docking simulation and confirmed by an immunoassay using a spot-synthesis based peptide array comprising amino acid sequences of six CDRs in the variable region...
August 28, 2017: ACS Combinatorial Science
https://www.readbyqxmd.com/read/28840600/red-blood-cell-minor-antigen-mismatches-during-chronic-transfusion-therapy-for-sickle-cell-anemia
#17
Marianne E M Yee, Cassandra D Josephson, Anne M Winkler, Jennifer Webb, Naomi L C Luban, Traci Leong, Sean R Stowell, Ross M Fasano
BACKGROUND: Red blood cell (RBC) alloimmunization occurs at a high frequency in sickle cell anemia (SCA) despite serologic matching for Rh (C/c, E/e) and K antigens. RBC minor antigen genotyping allows for prediction of antigens and RH variants that may lead to alloimmunization. STUDY DESIGN AND METHODS: RBC antigen genotyping was performed on chronically transfused pediatric SCA patients, using PreciseType human erythrocyte antigen (HEA), RHCE, and RHD BeadChip arrays...
August 24, 2017: Transfusion
https://www.readbyqxmd.com/read/28830733/the-mechanisms-of-t-cell-selection-in-the-thymus
#18
REVIEW
Hiroyuki Takaba, Hiroshi Takayanagi
T cells undergo positive and negative selection in the thymic cortex and medulla, respectively. A promiscuous expression of a wide array of self-antigens in the thymus is essential for the negative selection of self-reactive T cells and the establishment of central tolerance. Aire was originally thought to be the exclusive factor regulating the expression of tissue-restricted antigens, but Fezf2 recently emerged as a critical transcription factor in this regulatory activity. Fezf2 is selectively expressed in thymic medullary epithelial cells, regulates a large number of tissue-restricted antigens and suppresses the onset of autoimmune responses...
August 19, 2017: Trends in Immunology
https://www.readbyqxmd.com/read/28830009/humanization-of-jaa-f11-a-highly-specific-anti-thomsen-friedenreich-pancarcinoma-antibody-and-invitro-efficacy-analysis
#19
Swetha Tati, John C Fisk, Julia Abdullah, Loukia Karacosta, Taylor Chrisikos, Padraic Philbin, Susan Morey, Diala Ghazal, Fatma Zazala, Joseph Jessee, Sally Quataert, Stephen Koury, David Moreno, Jing Ying Eng, Vladislav V Glinsky, Olga V Glinskii, Muctarr Sesay, Anthony W Gebhard, Karamveer Birthare, James R Olson, Kate Rittenhouse-Olson
JAA-F11 is a highly specific mouse monoclonal to the Thomsen-Friedenreich Antigen (TF-Ag) which is an alpha-O-linked disaccharide antigen on the surface of ~80% of human carcinomas, including breast, lung, colon, bladder, ovarian, and prostate cancers, and is cryptic on normal cells. JAA-F11 has potential, when humanized, for cancer immunotherapy for multiple cancer types. Humanization of JAA-F11, was performed utilizing complementarity determining regions grafting on a homology framework. The objective herein is to test the specificity, affinity and biology efficacy of the humanized JAA-F11 (hJAA-F11)...
August 19, 2017: Neoplasia: An International Journal for Oncology Research
https://www.readbyqxmd.com/read/28827079/application-of-genomics-for-transfusion-therapy-in-sickle-cell-anemia
#20
Stella T Chou, Connie M Westhoff
The application of genomic approaches is impacting all areas of laboratory testing including transfusion medicine. Use of DNA-based test methods is particularly applicable for red cell and platelet antigen typing as the majority of genes encoding the carrier proteins and carbohydrates are now known and were cloned in the 1990's. Many of the antigenic polymorphisms are due to single nucleotide changes (SNP's) in the respective genes and DNA-arrays that target these changes have been validated by comparison with conventional serologic typing...
August 8, 2017: Blood Cells, Molecules & Diseases
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