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https://www.readbyqxmd.com/read/29315494/isotype-dependent-on-column-non-reversible-aggregation-of-monoclonal-antibodies
#1
Monika Farys, Daniel Gibson, Alan Lewis, Will Lewis, Richard Kucia-Tran
Monoclonal antibodies of the IgG2 and IgG4 isotype were found to exhibit an increased propensity for displaying two-peak elution profiles during cation exchange chromatography. In some cases, this two-peak elution profile also resulted in the formation of non-reversible mAb aggregates. Comparison of IgG1, IgG2 and IgG4 molecules with the same variable region reveals that the two-peak behaviour is predominantly mediated by the constant region and most likely the lower CH1, hinge and upper CH2 regions of the mAb...
January 8, 2018: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/29277486/development-of-a-high-throughput-bead-based-assay-system-to-measure-hiv-1-specific-immune-signatures-in-clinical-samples
#2
Thomas Liechti, Claus Kadelka, Hanna Ebner, Nikolas Friedrich, Roger D Kouyos, Huldrych F Günthard, Alexandra Trkola
The monitoring and assessment of a broadly neutralizing antibody (bnAb) based HIV-1 vaccine require detailed measurements of HIV-1 binding antibody responses to support the detection of correlates of protection. Here we describe the development of a flexible, high-throughput microsphere based multiplex assay system that allows monitoring complex binding antibody signatures. Studying a panel of 13 HIV-1 antigens in a parallel assessment of different IgG subclasses (IgG1, IgG2 and IgG3) we demonstrate the potential of our strategy...
December 22, 2017: Journal of Immunological Methods
https://www.readbyqxmd.com/read/29250787/metagenomics-in-pooled-plasma-with-identification-of-potential-emerging-infectious-pathogens
#3
Min Xu, Yashan Yang, Ya Zhou, Zhiyang Liu, Yu Liu, Miao He
BACKGROUND: Many emerging infectious pathogens are well known for existing in healthy blood donors and could be transmitted via blood transfusion or plasma derivatives usage. Therefore, there is an urgent need to discover the pathogens in qualified blood donation to avoid potential threats to blood safety. STUDY DESIGN AND METHODS: The objective of this study was to investigate the microbiome that existed in pooled plasma from different manufacturers in Chengdu and Guiyang...
December 17, 2017: Transfusion
https://www.readbyqxmd.com/read/29239894/temporal-variation-in-hiv-specific-igg-subclass-abs-during-acute-infection-differentiates-spontaneous-controllers-from-chronic-progressors
#4
Saheli Sadanand, Jishnu Das, Amy W Chung, Matthew K Schoen, Sophie Lane, Todd J Suscovich, Hendrik Streeck, Davey Smith, Susan Little, Douglas A Lauffenburger, Douglas Richman, Galit Alter
OBJECTIVE: Given the emerging appreciation for the role of antibody-dependent effector functions and IgG subclass distribution among spontaneous controllers of HIV, we sought to determine whether antibody-associated features diverged in early HIV infection between subjects who ultimately became controllers versus those who became progressors. METHODS: IgG was purified from plasma from nine acutely infected subjects who subsequently controlled HIV spontaneously (controllers) and ten acutely infected individuals who did not control viremia (progressors)...
December 12, 2017: AIDS
https://www.readbyqxmd.com/read/29199574/immunoreactivity-of-the-cold-water-extract-of-royal-sun-culinary-medicinal-mushroom-agaricus-brasiliensis-strain-ka21-agaricomycetes-assessed-by-immunoglobulin-preparations-for-intravenous-injection
#5
Katsuya Tajima, Masuro Motoi, Akitomo Motoi, Daisuke Yamanaka, Ken-Ichi Ishibashi, Yoshiyuki Adachi, Naohito Ohno
The royal sun medicinal mushroom, Agaricus brasiliensis, is a health food material that helps to improve quality of life. A. brasiliensis has long been used as a tea by extraction with cold and hot water. Our group has been investigating the immunopharmacological activities of the A. brasiliensis KA21 strain, which is cultivated outdoors. We prepared cold water (AgCWE) and hot water (AgHWE) extracts of this strain. AgCWE contained a larger proportion of proteins, including enzymes, and showed a brownish color during the extraction process...
2017: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/29188408/phase-ib-trial-of-the-anti-cancer-stem-cell-dll4-binding-agent-demcizumab-with-pemetrexed-and-carboplatin-as-first-line-treatment-of-metastatic-non-squamous-nsclc
#6
Mark J McKeage, Dusan Kotasek, Ben Markman, Manuel Hidalgo, Michael J Millward, Michael B Jameson, Dean L Harris, Robert J Stagg, Ann M Kapoun, Lu Xu, Brett G M Hughes
BACKGROUND: Delta-like ligand 4-Notch (DLL4-Notch) signaling contributes to the maintenance of chemotherapy-resistant cancer stem cells and tumor vasculature. OBJECTIVE: This phase IB trial of demcizumab, an IgG2 humanized monoclonal antibody directed against DLL4, was undertaken to determine its maximum tolerated dose, safety, immunogenicity, preliminary efficacy, pharmacokinetics, and pharmacodynamics, combined with standard chemotherapy. PATIENTS AND METHODS: Forty-six treatment-naive patients with metastatic non-squamous non-small cell lung cancer (NSCLC) were enrolled in this open-label, dose-escalation study using a standard 6 + 6 design...
November 29, 2017: Targeted Oncology
https://www.readbyqxmd.com/read/29155962/igg4-related-disease-presenting-with-raised-serum-igg2-real-timeline-of-igg4-rd
#7
Lisa Dunkley, Hardeep S Mudhar
No abstract text is available yet for this article.
January 1, 2018: Rheumatology
https://www.readbyqxmd.com/read/29130480/antidesmoglein-1-and-3-antibodies-in-healthy-subjects-of-a-population-in-the-peruvian-high-amazon
#8
Willy Ramos, Jesús Díaz, Ericson L Gutierrez, Jose S Lazarte, Mary C Bohnett, Gerardo Ronceros, Alex G Ortega-Loayza
BACKGROUND: The objective of this study was to determine the presence of anti-Dsg1 and Dsg3 antibodies in healthy subjects of the high Peruvian Amazon (Tuemal, Rodriguez de Mendoza province, department of Amazonas) to establish the theoretical presence of environmental factors or triggers in the area. MATERIALS AND METHODS: Cross-sectional study. The study population included persons of any age or gender, clinically healthy, who were evaluated by a dermatologist to confirm the absence of blistering diseases...
November 11, 2017: International Journal of Dermatology
https://www.readbyqxmd.com/read/29110285/chemical-and-biophysical-characteristics-of-monoclonal-antibody-solutions-containing-aggregates-formed-during-metal-catalyzed-oxidation
#9
Linda O Narhi, Quanzhou Luo, Jette Wypych, Riccardo Torosantucci, Andrea Hawe, Kiyoshi Fujimori, Yasser Nashed-Samuel, Vibha Jawa, Marisa K Joubert, Wim Jiskoot
PURPOSE: To physicochemically characterize and compare monoclonal antibody (mAb) solutions containing aggregates generated via metal catalyzed oxidation (MCO). METHODS: Two monoclonal IgG2s (mAb1 and mAb2) and one monoclonal IgG1 (rituximab) were exposed to MCO with the copper/ascorbic acid oxidative system, by using several different methods. The products obtained were characterized by complementary techniques for aggregate and particle analysis (from oligomers to micron sized species), and mass spectrometry methods to determine the residual copper content and chemical modifications of the proteins...
November 6, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/29101848/human-fc-receptor-like-5-distinguishes-igg2-disulfide-isoforms-and-deamidated-charge-variants
#10
Oyeleye Alabi, Jessica Dement-Brown, Mate Tolnay
Human Fc receptor-like 5 (FCRL5) is a novel IgG receptor. We reported that IgG2 samples display a thousand-fold range affinity for FCRL5, indicating that attributes beyond the isotype affect binding. We hypothesized that the complex interaction could be exploited to identify distinct changes in the IgG2 molecule. We investigated using surface plasmon resonance two factors that might affect the interaction between IgG2 and FCRL5; heterogeneity related to disulfide isoforms and charge variants. We found that panitumumab and denosumab samples enriched for the more flexible A disulfide isoform bound FCRL5 with two-fold and 82-fold higher apparent affinity, respectively, than the B isoform...
November 1, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/29079106/induction-of-a-balanced-igg1-igg2-immune-response-to-an-experimental-challenge-with-mycoplasma-bovis-antigens-following-a-vaccine-composed-of-emulsigen%C3%A2-idr-peptide1002-and-poly-i-c
#11
Tracy Prysliak, Teresia Maina, Lu Yu, Muhammad Suleman, Steve Jimbo, Jose Perez-Casal
Prevention and or control of Mycoplasma bovis infections in cattle have relied on the treatment of animals with antibiotics; herd management including separation and or culling infected animals; and the use of vaccines with limited protection. Due to the negative reactions and incomplete protection observed after vaccination with some bacterin-based vaccines, there is a need to put more efforts in the development of recombinant-based vaccines. However, the arsenal of antigens that may be suitable for a fully protective vaccine is rather limited at this point...
October 24, 2017: Vaccine
https://www.readbyqxmd.com/read/29078986/reversed-phase-chromatography-with-large-pore-superficially-porous-particles-for-high-throughput-immunoglobulin-g-2-disulfide-isoform-separation
#12
Bingchuan Wei, Bing Zhang, Barry Boyes, Yonghua Taylor Zhang
Reversed-phase liquid chromatography (RPLC) has been commonly used in IgG2 disulfide isoforms analysis. Recently, the columns packed with large pore superficially porous particles (SPP) have become available commercially. This work explores the application of this SPP technology in IgG2 disulfide isoforms separation. A high throughput and improved resolution RPLC method is developed with the optimization of column selection, gradient, temperature and flow rate. Compared with the small particles RP-UHPLC columns, large pore SPP columns provide unique selectivity and several new peaks were resolved and identified to be the free thiol variants of the IgG2 disulfide isoforms...
December 1, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29074301/identification-of-immune-biomarkers-related-to-disease-progression-and-treatment-efficacy-in-human-visceral-leishmaniasis
#13
Áquila S B Portela, Lourena E Costa, Beatriz C S Salles, Mariana P Lima, Thaís T O Santos, Fernanda F Ramos, Daniela P Lage, Vívian T Martins, Rachel B Caligiorne, Daniela R Lessa, Fabiana R Silva, Amanda S Machado, Guilherme F Nascimento, Isabela S Gama, Miguel A Chávez-Fumagalli, Antonio L Teixeira, Manoel O C Rocha, Regina L Rocha, Eduardo A F Coelho
Visceral leishmaniasis (VL) is a potentially fatal disease, in which the treatment based on chemotherapy is considered toxic. The cure of disease is associated with the life-long Th1-type immunity against the infection. The Th1-related cytokines production by peripheral blood mononuclear cells (PBMCs) seems to be crucial for host control of parasite load and clinical cure. In the current study, we used five proteins (IgE-dependent histamine-releasing factor [HRF], LiHyD, LiHyV, LiHyT and LiHyp6) recently shown to be antigenic and/or immunogenic in the canine VL, aiming to evaluate the antigen-specific antibody levels and cytokine production in PBMCs culture supernatants collected from VL patients before and after anti-VL treatment...
October 20, 2017: Immunobiology
https://www.readbyqxmd.com/read/29063242/clinical-spectrum-and-igg-subclass-analysis-of-anti-myelin-oligodendrocyte-glycoprotein-antibody-associated-syndromes-a-multicenter-study
#14
Sara Mariotto, Sergio Ferrari, Salvatore Monaco, Maria Donata Benedetti, Kathrin Schanda, Daniela Alberti, Alessia Farinazzo, Ruggero Capra, Chiara Mancinelli, Nicola De Rossi, Roberto Bombardi, Luigi Zuliani, Marco Zoccarato, Raffaella Tanel, Adriana Bonora, Marco Turatti, Massimiliano Calabrese, Alberto Polo, Antonino Pavone, Luisa Grazian, GianPietro Sechi, Elia Sechi, Daniele Urso, Rachele Delogu, Francesco Janes, Luciano Deotto, Morena Cadaldini, Maria Rachele Bianchi, Gaetano Cantalupo, Markus Reindl, Alberto Gajofatto
Anti-myelin oligodendrocyte glycoprotein antibodies (MOG-Ab) recently emerged as a potential biomarker in patients with inflammatory demyelinating diseases of the central nervous system. We here compare the clinical and laboratory findings observed in a cohort of MOG-Ab seropositive and seronegative cases and describe IgG subclass analysis results. Consecutive serum samples referred to Verona University Neuropathology Laboratory for aquaporin-4 (AQP4)-Ab and/or MOG-Ab testing were analysed between March 2014 and May 2017...
October 23, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/29056058/novel-strategy-using-tryptic-peptide-immunoaffinity-based-lc-ms-ms-to-quantify-denosumab-in-monkey-serum
#15
Qing Wang, Jiangbin Han, Chunjie Sha, Yuanyingzhu Liang, Yiying Sun, Xin Shao, Jiye Sun, Wanhui Liu
AIM: Denosumab is a recombinant fully human IgG2 that has a high affinity and specificity for human RANKL. Commercially available RANKL labeled with an Fc fragment cannot be used to establish an indirect ELISA. To characterize denosumab pharmacokinetic a robust and accuracy method should be developed urgently. RESULTS: In this study, an immunoaffinity enrichment method coupled with LC-MS/MS was established. The LC-MS/MS method acquired a linear range from 0.1 to 30 μg/ml...
October 21, 2017: Bioanalysis
https://www.readbyqxmd.com/read/29042863/adult-reference-intervals-for-igg-subclasses-with-siemens-immunonephelometric-assays-in-chinese-population
#16
Ping Li, Zhongjuan Liu, Ziyan Wu, Xiaoting Wen, Liubing Li, Shulan Zhang, Yingchun Xu, Yongzhe Li
OBJECTIVE: To determine the adult reference intervals for the Siemens IgG subclass reagents. METHODS: 636 blood samples of healthy adults were analyzed to determine the level of IgG subclass using the reagents of Siemens immunonephelometric assay with molecular biology kits. RESULTS: IgGSc reference intervals were as follows: IgG1 4.45-9.76 g/L, IgG2 2.07-8.57 g/L, IgG3 0.08-0.80 g/L and IgG4 0.05-1.54 g/L. There was an excellent correlation between the total IgG and the sum of the IgG subclasses...
2017: Allergy, Asthma, and Clinical Immunology
https://www.readbyqxmd.com/read/29034405/immunohistochemical-and-serological-characterization-of-membranous-nephropathy-in-children-and-adolescents
#17
Anne K Dettmar, Thorsten Wiech, Markus J Kemper, Armin Soave, Michael Rink, Jun Oh, Rolf A K Stahl, Elion Hoxha
BACKGROUND: Membranous nephropathy (MN) is a common cause of nephrotic syndrome in adults, but is less frequent in children. Antibodies against four antigens leading to MN have been described in children: phospholipase A2 receptor 1 (PLA2R1), thrombospondin type-1 domain-containing 7A (THSD7A), neutral endopeptidase (NEP), and cationic bovine serum albumin (BSA). METHODS: Twelve children with MN were included in this study. Sera of all patients were analyzed for antibodies against PLA2R1, THSD7A, NEP, and BSA...
October 15, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/29031045/structural-characterization-of-the-man5-glycoform-of-human-igg3-fc
#18
Ishan S Shah, Scott Lovell, Nurjahan Mehzabeen, Kevin P Battaile, Thomas J Tolbert
Immunoglobulin G (IgG) consists of four subclasses in humans: IgG1, IgG2, IgG3 and IgG4, which are highly conserved but have unique differences that result in subclass-specific effector functions. Though IgG1 is the most extensively studied IgG subclass, study of other subclasses is important to understand overall immune function and for development of new therapeutics. When compared to IgG1, IgG3 exhibits a similar binding profile to Fcγ receptors and stronger activation of complement. All IgG subclasses are glycosylated at N297, which is required for Fcγ receptor and C1q complement binding as well as maintaining optimal Fc conformation...
December 2017: Molecular Immunology
https://www.readbyqxmd.com/read/29027520/further-evidence-associating-igg1-but-not-igg2-with-susceptibility-to-canine-visceral-leishmaniasis-caused-by-leishmania-l-infantum-chagasi-infection
#19
Luciana Vieira do R Lima, Liliane Almeida Carneiro, Marliane Batista Campos, Thiago Vasconcelos Dos Santos, Patrícia Karla Ramos, Márcia Dalastra Laurenti, Claudio Eduardo C Teixeira, Fernando T Silveira
We present here a cross-sectional study analyzing the IgG1 and IgG2 immune responses to natural canine Leishmania (L.) infantum chagasi-infection and their relationships with delayed-type hypersensitivity (DTH) in 50 mongrel dogs with previous positive serodiagnoses (IFAT-IgG) (56% with subclinical status [= apparently healthy] and 44% clinically sick), living in endemic areas for visceral leishmaniasis in the Brazilian Amazon. IgG1 and IgG2 responses were measured using commercial polyclonal antibodies in ELISA, while DTH was elicited by intradermal skin test using cultured promastigotes L...
2017: Parasite: Journal de la Société Française de Parasitologie
https://www.readbyqxmd.com/read/29023393/flavanol-rich-cocoa-powder-interacts-with-lactobacillus-rhamnossus-lgg-to-alter-the-antibody-response-to-infection-with-the-parasitic-nematode-ascaris-suum
#20
Saebyeol Jang, Sukla Lakshman, Ethiopia Beshah, Yue Xie, Aleksey Molokin, Bryan T Vinyard, Joseph F Urban, Cindy D Davis, Gloria I Solano-Aguilar
Consumption of the probiotic bacteria LactobacillusrhamnosusLGG and flavanol-rich cocoa have purported immune modulating effects. This study compared the host response to infection with Ascaris suum in three-month-old pigs fed a standard growth diet supplemented with a vehicle control: LGG, cocoa powder (CP) or LGG + CP. Pigs were inoculated with infective A. suum eggs during Week 5 of dietary treatment and euthanized 17 days later. Lactobacillus abundance was increased in pigs fed LGG or LGG + CP. Specific anti-A...
October 12, 2017: Nutrients
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