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Anti-polysaccharide Antibody

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https://www.readbyqxmd.com/read/29135332/antibodies-to-pcpa-and-phtd-protect-mice-against-streptococcus-pneumoniae-by-a-macrophage-and-complement-dependent-mechanism
#1
Lucian Visan, Nicolas Rouleau, Emilie Proust, Loïc Peyrot, Arnaud Donadieu, Martina Ochs
Currently marketed Streptococcus pneumoniae (Spn) vaccines, which contain polysaccharide capsular antigens from the most common Spn serotypes, have substantially reduced pneumococcal disease rates but have limited coverage. A trivalent pneumococcal protein vaccine containing pneumococcal choline-binding protein A (PcpA), pneumococcal histidine triad protein D (PhtD), and detoxified pneumolysin is being developed to provide broader, cross-serotype protection. Antibodies against detoxified pneumolysin protect against bacterial pneumonia by neutralizing Spn-produced pneumolysin, but how anti-PhtD and anti-PcpA antibodies protect against Spn has not been established...
November 14, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/29123031/structure-function-characterization-of-three-human-antibodies-targeting-the-vaccinia-virus-adhesion-molecule-d8
#2
Michael H Matho, Andrew Schlossman, Iuliia M Gilchuk, Greg Miller, Zbigniew Mikulski, Matthias Hupfer, Jing Wang, Aruna Bitra, Xianghzi Meng, Yan Xiang, Tom Kaever, Tzanko Doukov, Klaus Ley, Shane Crotty, Bjoern Peters, Linda C Hsieh-Wilson, James E Crowe, Dirk M Zajonc
Vaccinia virus (VACV) envelope protein D8 is one of three glycosaminoglycan adhesion molecules and binds to the linear polysaccharide chondroitin sulfate (CS). D8 is also a target for neutralizing antibody responses that are elicited by the smallpox vaccine, which has enabled the first eradication of a human viral pathogen and is a useful model for studying antibody responses. However, to date, VACV epitopes targeted by human antibodies have not been characterized at atomic resolution. Here, we characterized the binding properties of several human anti-D8 antibodies and determined the crystal structures of three VACV-MAb variants, VACV-66, VACV-138, and VACV-304, separately bound to D8...
November 9, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29119074/case-report-on-a-defective-antibody-response-against-pneumococcal-serotype-9v-in-a-patient-with-a-single-episode-of-pneumonia
#3
Diana van Kessel, Thijs Hoffman, Heleen van Velzen-Blad, Bob Meek, Suzan van Mens, Jan Grutters, Ger Rijkers
Background: Patients with recurrent respiratory tract infections and an impaired response to pneumococcal polysaccharide vaccination are diagnosed with a specific antibody deficiency. In adult patients with pneumococcal pneumonia an impaired antibody response to the infecting pneumococcal serotype can sometimes be found. It is unknown whether these patients are unable to produce an adequate anti-polysaccharide antibody response to pneumococcal vaccination after recovery. Case presentation: The authors describe a case of invasive pneumonia caused by Streptococcus pneumoniae serotype 9V in a previously healthy 35-year-old female...
2017: Pneumonia
https://www.readbyqxmd.com/read/29107141/immunoadjuvant-activity-in-mice-of-polysaccharides-isolated-from-the-leaves-of-panax-ginseng-c-a-meyer
#4
Su-Hyun Hwang, Myoung-Sook Shin, Taek Joon Yoon, Kwang-Soon Shin
Our previous study showed polysaccharide (GS-P) isolated from the leaves of Panax ginseng C.A. Meyer possessed anti-tumor metastatic activity in mouse model. In this study, we evaluated the immunoadjuvant effect of GS-P on the induction of humoral and cellular immune responses against ovalbumin (OVA) in mice. When mice were immunized subcutaneously with OVA admixed with or without GS-P, the OVA+GS-P group showed significantly higher antibody production than the group immunized with OVA alone. This suggests that GS-P has the ability to enhance the adaptive immune response...
October 26, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29099340/humoral-immunity-in-mice-transplanted-with-hematopoietic-stem-cells-derived-from-human-umbilical-cord-blood-recapitulates-that-of-human-infants
#5
Justin A Walker, Raja Vuyyuru, Tim Manser, Kishore R Alugupalli
Immunodeficient mice transplanted with human hematopoietic stem cells (HSCs) have been referred to as "Human Immune System" (HIS) mice and are a translational platform for studying human immune responses in vivo. Human HSC sources used in generating HIS mice include fetal liver (FL), umbilical cord blood (CB), and adult bone marrow (BM). Since HSCs from FL, CB, and BM are produced at various stages of human development, we tested whether mice transplanted with these three HSCs differ in their immune responses...
November 3, 2017: Stem Cells and Development
https://www.readbyqxmd.com/read/29094629/infectious-diseases-and-immunological-markers-associated-with-patients-with-non-hodgkin-lymphoma-treated-with-rituximab
#6
Kleber Jordão de Souza, Rodrigo Sala Ferro, Luiz Euribel Prestes-Carneiro, Paula Andreia Martins Carrilho, Dewton de Moraes Vasconcelos
BACKGROUND: The use of rituximab (RTX) is increasing, even in developing countries. It has become the first-line therapy or adjuvant to chemotherapy (CHOP; cyclophosphamide, hydroxydaunorubicin, oncovin and prednisone) for various diseases, including B cell lymphoma and autoimmune diseases. AIM: We describe the infectious diseases and immunological markers associated with RTX treatment of patients with non-Hodgkin lymphoma (NHL). METHODS: Serum immunoglobulins were determined before and after intravenous immunoglobulin (IVIg) administration...
November 2, 2017: Immunopharmacology and Immunotoxicology
https://www.readbyqxmd.com/read/29024844/structural-characterisation-of-the-capsular-polysaccharide-expressed-by-burkholderia-thailandensis-strain-e555-wbii-pknock-kmr-and-assessment-of-the-significance-of-the-2-o-acetyl-group-in-immune-protection
#7
Marc Bayliss, Matthew I Donaldson, Sergey A Nepogodiev, Giulia Pergolizzi, Andrew E Scott, Nicholas J Harmer, Robert A Field, Joann L Prior
Burkholderia pseudomallei and its close relative B. mallei are human pathogens that are classified as Tier 1 bio-threat agents. Both organisms have previously been shown to constitutively produce a capsular polysaccharide (CPS) that is both a virulence determinant and protective antigen. Extraction and purification of CPS for use as a potential vaccine candidate requires containment level 3 laboratories which is expensive and time-consuming. B. thailandensis strain E555 is closely related to B. pseudomallei and B...
November 27, 2017: Carbohydrate Research
https://www.readbyqxmd.com/read/28973394/synthesis-and-characterization-of-heparosan-granulocyte-colony-stimulating-factor-conjugates-a-natural-sugar-based-drug-delivery-system-to-treat-neutropenia
#8
Wei Jing, Jonathan W Roberts, Dixy E Green, Andrew Almond, Paul L DeAngelis
Many injectable drugs require delivery strategies for enhancing their pharmacokinetics due to rapid loss via renal filtration if possess low molecular weight (<60-70 kDa) and/or clearance by the body's components (e.g., proteases, antibodies, high-efficiency receptors) in their native form. FDA-approved polyethylene glycol [PEG] is a vehicle for improving therapeutics, but artificial polymers have potential biocompatibility and immunogenicity liabilities. Here we utilized a natural vertebrate carbohydrate, heparosan [HEP], the biosynthetic precursor of heparan sulfate and heparin, to enhance performance of a biologic drug...
August 23, 2017: Glycobiology
https://www.readbyqxmd.com/read/28947651/the-capsular-polysaccharide-of-acinetobacter-baumannii-is-an-obstacle-for-therapeutic-passive-immunization-strategies
#9
Shun Xin Wang-Lin, Ruth Olson, Janet M Beanan, Ulrike MacDonald, Joseph P Balthasar, Thomas A Russo
Acinetobacter baumannii has become an important concern to human health due to rapid development and wide spread of antimicrobial-resistant strains and high mortality associated with the infection. Passive immunizations with antisera targeting outer membrane proteins (OMPs) have shown encouraging results in protecting mice from A. baumannii infection; but monoclonal anti-OMP antibodies have not been developed and their potential therapeutic properties have not been explored. The goal of this report is to evaluate the antibacterial activity of monoclonal antibodies (mAbs) targeting outer membrane protein A (OmpA) of A...
September 25, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28943439/a-homogalacturonan-from-hippophae-rhamnoides-l-berries-enhance-immunomodulatory-activity-through-tlr4-myd88-pathway-mediated-activation-of-macrophages
#10
Hailiang Wang, Hongtao Bi, Tingting Gao, Bin Zhao, Weihua Ni, Jun Liu
Our previous study isolated a natural high-methoxyl homogalacturonan (HRWP-A) from Hippophae rhamnoides and showed antitumor activity in vivo. In this study, the immunomodulatory activity and mechanisms of action of HRWP-A were further investigated. Results showed that HRWP-A could recover the body condition and activated macrophage in Cyclophosphamide (CTX)-induced immunosuppressed mice. Further, we investigated the possible mechanism underlying the effects of HRWP-A on mouse peritoneal macrophages. qPCR and western blot revealed that HRWP-A upregulated the expression of TLR4 mRNA in vitro...
September 21, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28942945/polysaccharides-derived-from-ganoderma-lucidum-fungus-mycelia-ameliorate-indomethacin-induced-small-intestinal-injury-via-induction-of-gm-csf-from-macrophages
#11
Kenta Nagai, Yoshitaka Ueno, Shinji Tanaka, Ryohei Hayashi, Kei Shinagawa, Kazuaki Chayama
Non-steroidal anti-inflammatory drugs often cause ulcers in the human small intestine, but few effective agents exist to treat such injury. Ganoderma lucidum Karst, also known as "Reishi" or "Lingzhi", is a mushroom. We previously reported that a water-soluble extract from G. lucidum fungus mycelia (MAK) has anti-inflammatory effects in murine colitis induced by trinitrobenzene sulfonic acid, and induction of granulocyte macrophage colony-stimulating factor (GM-CSF) by MAK may provide anti-inflammatory effects...
October 2017: Cellular Immunology
https://www.readbyqxmd.com/read/28935471/prevalence-and-decay-of-maternal-pneumococcal-and-meningococcal-antibodies-a-meta-analysis-of-type-specific-decay-rates
#12
Merryn Voysey, Andrew J Pollard, Manish Sadarangani, Thomas R Fanshawe
BACKGROUND: At the time of an infant's initial vaccination at age ∼2 to 3months, some infants already have maternal antibodies against vaccine antigens and these can suppress the immune response to vaccination. Modelling the effects of maternal antibody and the timing of infant doses on the antibody response to vaccination, requires estimates of the rate of maternal antibody decay. Decay rates are not well characterised in the medical literature. We investigated variation in the prevalence of maternal anti-capsular pneumococcal and meningococcal antibodies in infants in 14 countries, and estimated type-specific half-lives...
October 13, 2017: Vaccine
https://www.readbyqxmd.com/read/28903988/the-use-of-reverse-vaccinology-in-the-design-and-construction-of-nano-glycoconjugate-vaccines-against-burkholderia-pseudomallei
#13
Laura A Muruato, Daniel Tapia, Christopher L Hatcher, Mridul Kalita, Paul J Brett, Anthony E Gregory, James E Samuel, Richard W Titball, Alfredo G Torres
Burkholderia pseudomallei (Bpm) is a Gram negative, facultative intracellular pathogen that causes the disease melioidosis in humans and other mammals. Respiratory infection with B. pseudomallei leads to a fulminant and often fatal disease. It has previously been shown that glycoconjugate vaccines can provide significant protection against lethal challenge; however, the limited number of known Burkholderia antigens has slowed progress towards vaccine development. The objective of this study was to identify novel antigens and evaluate their protective capacity when incorporated into a nano-glycoconjugate vaccine platform...
September 13, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28890375/anti-inflammatory-properties-of-glpss58-a-sulfated-polysaccharide-from-ganoderma-lucidum
#14
Kai Zhang, Yanfang Liu, Xiangli Zhao, Qingjiu Tang, Jens Dernedde, Jingsong Zhang, Hua Fan
Sulfated polysaccharides exhibit various biological properties, including anti-coagulant, anti-oxidant, anti-viral, anti-cancer, anti-inflammatory and immune regulatory activities. In the present study, the anti-inflammatory properties of GLPss58, a sulfated polysaccharide from Ganoderma lucidum formed by chemical sulfation, were investigated. We found that GLPss58 inhibited L-selectin/sTyr-sLeX binding significantly, blocked the binding of anti-L-selectin antibodies to L-selectin on the surface of human peripheral blood lymphocytes, and inhibited the secondary lymphoid tissue chemokine-induced chemotactic invasion of HPBLs...
September 7, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28889208/detection-of-human-antibodies-binding-with-smooth-and-rough-lpss-from-proteus-mirabilis-o3-strains-s1959-r110-r45
#15
J Gleńska-Olender, K Durlik, I Konieczna, P Kowalska, J Gawęda, W Kaca
Bacteria of the genus Proteus of the family Enterobacteriaceae are facultative human pathogens responsible mainly for urinary tract and wound infections, bacteremia and the development of rheumatoid arthritis (RA). We have analyzed and compared by ELISA the titer of antibodies in plasmas of healthy individuals and in sera of rheumatoid arthritis patients recognizing a potential host cross-reactive epitope (lysine-galacturonic acid epitopes) present in Proteus lipopolysaccharide (LPS). In our experiments LPSs isolated from two mutants of smooth Proteus mirabilis 1959 (O3), i...
November 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28875600/validation-of-the-world-health-organization-enzyme-linked-immunosorbent-assay-for-the-quantitation-of-immunoglobulin-g-serotype-specific-anti-pneumococcal-antibodies-in-human-serum
#16
Hyunju Lee, Soo Young Lim, Kyung Hyo Kim
The World Health Organization (WHO) enzyme-linked immunosorbent assay (ELISA) guideline is currently accepted as the gold standard for the evaluation of immunoglobulin G (IgG) antibodies specific to pneumococcal capsular polysaccharide. We conducted validation of the WHO ELISA for 7 pneumococcal serotypes (4, 6B, 9V, 14, 18C, 19F, and 23F) by evaluating its specificity, precision (reproducibility and intermediate precision), accuracy, spiking recovery test, lower limit of quantification (LLOQ), and stability at the Ewha Center for Vaccine Evaluation and Study, Seoul, Korea...
October 2017: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/28846502/rare-high-affinity-anti-pathogen-antibodies-from-human-repertoires-discovered-using-microfluidics-and-molecular-genomics
#17
Adam S Adler, Rena A Mizrahi, Matthew J Spindler, Matthew S Adams, Michael A Asensio, Robert C Edgar, Jackson Leong, Renee Leong, Lucy Roalfe, Rebecca White, David Goldblatt, David S Johnson
Affinity-matured, functional anti-pathogen antibodies are present at low frequencies in natural human repertoires. These antibodies are often excellent candidates for therapeutic monoclonal antibodies. However, mining natural human antibody repertoires is a challenge. In this study, we demonstrate a new method that uses microfluidics, yeast display, and deep sequencing to identify 247 natively paired anti-pathogen single-chain variable fragments (scFvs), which were initially as rare as 1 in 100,000 in the human repertoires...
November 2017: MAbs
https://www.readbyqxmd.com/read/28832951/comparative-analysis-of-plant-produced-recombinant-dimeric-iga-against-cell-wall-%C3%AE-glucan-of-pathogenic-fungi
#18
COMPARATIVE STUDY
Cristina Capodicasa, Marcello Catellani, Ilaria Moscetti, Carla Bromuro, Paola Chiani, Antonella Torosantucci, Eugenio Benvenuto
Immunoglobulins A (IgA) are crucially involved in protection of human mucosal surfaces from microbial pathogens. In this work, we devised and expressed in plants recombinant chimeric antifungal antibodies (Abs) of isotype A (IgA1, IgA2, and scFvFcA1), derived from a murine mAb directed to the fungal cell wall polysaccharide β-glucan which had proven able to confer protection against multiple pathogenic fungi. All recombinant IgA (rIgA) were expressed and correctly assembled in dimeric form in plants and evaluated for yield, antigen-binding efficiency and antifungal properties in vitro, in comparison with a chimeric IgG1 version...
December 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28832613/structural-and-immunochemical-relatedness-suggests-a-conserved-pathogenicity-motif-for-secondary-cell-wall-polysaccharides-in-bacillus-anthracis-and-infection-associated-bacillus-cereus
#19
Nazia Kamal, Jhuma Ganguly, Elke Saile, Silke R Klee, Alex Hoffmaster, Russell W Carlson, Lennart S Forsberg, Elmar L Kannenberg, Conrad P Quinn
Bacillus anthracis (Ba) and human infection-associated Bacillus cereus (Bc) strains Bc G9241 and Bc 03BB87 have secondary cell wall polysaccharides (SCWPs) comprising an aminoglycosyl trisaccharide repeat: →4)-β-d-ManpNAc-(1→4)-β-d-GlcpNAc-(1→6)-α-d-GlcpNAc-(1→, substituted at GlcNAc residues with both α- and β-Galp. In Bc G9241 and Bc 03BB87, an additional α-Galp is attached to O-3 of ManNAc. Using NMR spectroscopy, mass spectrometry and immunochemical methods, we compared these structures to SCWPs from Bc biovar anthracis strains isolated from great apes displaying "anthrax-like" symptoms in Cameroon (Bc CA) and Côte d'Ivoire (Bc CI)...
2017: PloS One
https://www.readbyqxmd.com/read/28826771/astragalus-polysaccharides-enhance-the-immune-response-to-avian-infectious-bronchitis-virus-vaccination-in-chickens
#20
Pengju Zhang, Jun Wang, Weixia Wang, Xiaohui Liu, Haiyan Liu, Xintao Li, Xinghong Wu
Astragalus polysaccharides (APS) are biological macromolecules extracted from Astragalus species that have strong immunoregulatory properties. In this study, APS were employed as an adjuvant for an avian infectious bronchitis virus (IBV) vaccine, and its effects on the cellular immune and humoral immune responses to vaccination in chicken were investigated. One hundred and fifty chicken were randomly divided into five groups (n = 30, each group). The chickens in all groups, except for the unvaccinated control group, were vaccinated with an IBV DNA vaccine...
October 2017: Microbial Pathogenesis
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