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Leonardo Silva de Araujo, Nidai de Bárbara Moreira da Silva, Janaina Aparecida Medeiros Leung, Fernanda Carvalho Queiroz Mello, Maria Helena Féres Saad
Despite the reported high heterogeneity of the human immune response to tuberculosis (TB), new studies may contribute to the understanding of Mycobacterium tuberculosis immunopathogenesis. To investigate the patterns of humoral response during latent (LTBI) and active TB, we evaluated specific IgG subclasses' response, by ELISA, to a set of mycobacterial antigens (Rv2029c, Rv2031c, Rv2034, Rv2628, Rv3353c ESAT6:CFP10, and the new chimeric PstS1(285-374) :CFP10) in plasma samples from exposed uninfected controls (ExC, n = 24), LTBI (n = 61), and TB (n = 15) donors...
January 2018: Tuberculosis
María Elena Iezzi, Lucía Policastro, Santiago Werbajh, Osvaldo Podhajcer, Gabriela Alicia Canziani
Monoclonal antibodies and their fragments have significantly changed the outcome of cancer in the clinic, effectively inhibiting tumor cell proliferation, triggering antibody-dependent immune effector cell activation and complement mediated cell death. Along with a continued expansion in number, diversity, and complexity of validated tumor targets there is an increasing focus on engineering recombinant antibody fragments for lead development. Single-domain antibodies (sdAbs), in particular those engineered from the variable heavy-chain fragment (VHH gene) found in Camelidae heavy-chain antibodies (or IgG2 and IgG3), are the smallest fragments that retain the full antigen-binding capacity of the antibody with advantageous properties as drugs...
2018: Frontiers in Immunology
Ann J Hessell, Mariya B Shapiro, Rebecca Powell, Delphine C Malherbe, Sean P McBurney, Shilpi Pandey, Tracy Cheever, William F Sutton, Christoph Kahl, Byung Park, Susan Zolla-Pazner, Nancy L Haigwood
A high level of V1V2-specific IgG antibodies in vaccinees' sera was the only independent variable that correlated with a reduced risk of HIV acquisition in the RV144 clinical trial. In contrast, IgG avidity, antibody neutralization, and antibody-dependent cellular cytotoxicity each failed as independent correlates of infection. Extended analyses of RV144 samples demonstrated antiviral activity of V1V2-specific vaccine-induced antibodies. V2-specific antibodies have also been associated with protection from SIV, and the V2i-specific subset of human monoclonal antibodies (mAbs), while poor neutralizers, mediate Fc-dependent antiviral functions in vitro The objective of this study was to determine the protective efficacy of a V2i-specific human mAb 830A against mucosal SHIV challenge...
March 7, 2018: Journal of Virology
Adrián Lázaro-Frías, Sergio Gómez-Medina, Lucas Sánchez-Sampedro, Karl Ljungberg, Mart Ustav, Peter Liljeström, César Muñoz-Fontela, Mariano Esteban, Juan García-Arriaza
Zaire and Sudan ebolavirus species cause a severe disease in humans and non-human primates (NHPs) characterized by high mortality rate. There are no licensed therapies or vaccines against Ebola virus disease (EVD), and the recent 2013-2016 outbreak in West Africa highlighted the need of EVD-specific medical countermeasures. Here, we have generated and characterized head-to-head the immunogenicity and efficacy of five vaccine candidates against Zaire ebolavirus (EBOV) and Sudan ebolavirus (SUDV) based on the highly attenuated poxvirus vector modified vaccinia virus Ankara (MVA), expressing either the virus glycoprotein (GP) or GP together with the virus protein 40 (VP40) forming virus-like particles (VLPs)...
March 7, 2018: Journal of Virology
Pedro Henrique Ferreira Marçal, Lúcia Alves de Oliveira Fraga, Ana Márcia Menezes de Mattos, Laura Menegati, Angélica da Conceição Oliveira Coelho, Roberta Olmo Pinheiro, Euzenir Nunes Sarno, Malcolm S Duthie, Henrique Couto Teixeira
BACKGROUND Leprosy remains a health problem in many countries, with difficulties in diagnosis resulting in delayed treatment and more severe disabilities. Antibodies against several Mycobacterium leprae antigens have, however, shown value as diagnostic and/or prognostic markers. OBJECTIVES The objective of this study was to evaluate serum immunoglobulin (Ig) IgM and IgG subclass reactivity against three M. leprae specific antigens: NDO-HSA, a conjugate formed by natural octyl disaccharide bound to human serum albumin; LID-1, the fusion protein product of the ml0405 and ml2331 genes; and NDO-LID, a combination of LID-1 and NDO...
2018: Memórias do Instituto Oswaldo Cruz
N Yoshimoto, H Ujiie, M Zheng, H Iwata, H Kosumi, H Hata, H Shimizu
Bullous pemphigoid (BP) is the most common subepidermal autoimmune blistering skin disease, characterized by tense bullae and urticarial erythema with a generalized distribution. BP is induced by autoantibodies to structural proteins of the basement membrane zone (BMZ) such as BP180 and BP2301 . Because the majority of BP skin shows complement deposition2 , complement activation is considered to be important for blister formation. Among IgG subclasses, IgG1 have a high ability to activate complements, whereas IgG2 and IgG4 have a low and no ability, respectively...
March 6, 2018: Journal of the European Academy of Dermatology and Venereology: JEADV
Elena Blanco, Martín Pérez-Andrés, Sonia Arriba-Méndez, Teresa Contreras-Sanfeliciano, Ignacio Criado, Ondrej Pelak, Ana Serra-Caetano, Alfonso Romero, Noemí Puig, Ana Remesal, Juan Torres Canizales, Eduardo López-Granados, Tomas Kalina, Ana E Sousa, Menno Van Zelm, Mirjam Van der Burg, Jacques J M van Dongen, Alberto Orfao
BACKGROUND: Humoral immunocompetence develops stepwise throughout life and contributes to individual susceptibility to infection, immunodeficiency, autoimmunity and neoplasia. Immunoglobulin heavy chain (IgH)-isotype serum levels can partly explain such age-related differences, but their relationship with the IgH-isotype distribution within memory B-cell (MBCs) and plasma cell (PCs) compartments remains to be investigated. OBJECTIVE: We studied the age-related distribution of MBCs and PCs expressing different IgH-isotypes, in addition to the immature/transitional and naive B-cell compartments...
March 2, 2018: Journal of Allergy and Clinical Immunology
Zhongjuan Liu, Chuiwen Deng, Ping Li, Jingxia Wang, Lijuan Ma, Yongzhe Li, Yingchun Xu
BACKGROUND: Reference intervals (RIs) for serum IgG subclasses vary greatly among different geographical regions. The present study aimed to establish RIs for serum IgG subclasses in Chinese children, which is essential for interpretation of laboratory findings and making clinical decisions. METHODS: This study was performed in accordance with guideline C28-A3, proposed by the International Federation of Clinical Chemistry and the Clinical and Laboratory Standards Institute...
2018: PloS One
Silvia Baroncelli, Clementina Maria Galluzzo, Giuseppe Liotta, Mauro Andreotti, Sandro Mancinelli, Robert Mphwere, Enok Bokola, Roberta Amici, Maria Cristina Marazzi, Leonardo Palombi, Francesca Lucaroni, Marina Giuliano
BACKGROUND: Transplacental passage of IgGs is impaired in HIV + pregnant women, possibly determining an inadequate immunological protection in their children. We aimed to determine the impact of maternal immunological IgG profile and immunoactivation status on the efficiency of transplacental passage of IgG subclasses in HIV + mothers. METHODS: 16 mother/infants pairs were studied in Malawi. Mothers received antiretroviral therapy (ART) from the third trimester of pregnancy...
February 27, 2018: Medical Microbiology and Immunology
Amre Nasr, Ayman M Saleh, Muna Eltoum, Amir Abushouk, Anhar Hamza, Ahmad Aljada, Mohamed E El-Toum, Yousif A Abu-Zeid, Gamal Allam, Gehad ElGhazali
Fulani and Masaleit are two sympatric ethnic groups in western Sudan who are characterised by marked differences in susceptibility to Plasmodium falciparum malaria. It has been demonstrated that Glucose-6-phosphate dehydrogenase (G6PD) deficiency and Sickle cell trait HbAS carriers are protected from the most severe forms of malaria. This study aimed to investigate a set of specific IgG subclasses against P. falciparum Apical Membrane Antigen 1 (AMA-1 3D7), haemoglobin variants and (G6PD) in association with malaria susceptibility among Fulani ethnic group compared to sympatric ethnic group living in Western Sudan...
February 24, 2018: Acta Tropica
Anselm Jünemann, Bettina Hohberger, Jürgen Rech, Ahmed Sheriff, Qin Fu, Ursula Schlötzer-Schrehardt, Reinhard Edmund Voll, Sabine Bartel, Hubert Kalbacher, Johan Hoebeke, Robert Rejdak, Folkert Horn, Gerd Wallukat, Rudolf Kunze, Martin Herrmann
Glaucoma is a frequent ocular disease that may lead to blindness. Primary open-angle glaucoma (POAG) and ocular hypertension (OHT) are common diseases with increased intraocular pressure (IOP), which are mainly responsible for these disorders. Their pathogenesis is widely unknown. We screened the sera of patients with POAG and OHT for the prevalence of autoantibodies (AAb) against G protein-coupled receptors (GPCRs) in comparison to controls. Employing frequency modulation of spontaneously contracting neonatal rat cardiomyocytes in vitro , agonistic GPCR AAb were to be detected in roughly 75% of the patients with POAG and OHT, however, not in controls...
2018: Frontiers in Immunology
Loukia G Karacosta, John C Fisk, Joseph Jessee, Swetha Tati, Bradley Turner, Diala Ghazal, Rachel Ludwig, Holly Johnson, Julia Adams, Munawwar Sajjad, Steven Koury, Rene Roy, James R Olson, Kate Rittenhouse-Olson
The tumor specificity of JAA-F11, a novel monoclonal antibody specific for the Thomsen-Friedenreich cancer antigen (TF-Ag-alpha linked), has been comprehensively studied by in vitro immunohistochemical (IHC) staining of human tumor and normal tissue microarrays and in vivo biodistribution and imaging by micro-positron emission tomography imaging in breast and lung tumor models in mice. The IHC analysis detailed herein is the comprehensive biological analysis of the tumor specificity of JAA-F11 antibody performed as JAA-F11 is progressing towards preclinical safety testing and clinical trials...
February 22, 2018: Translational Oncology
Pamela Holzlöhner, Monique Butze, Natalia Maier, Nicole Hebel, Erik Schliebs, Burkhard Micheel, Jonas Füner, Gabriele Heidicke, Katja Hanack
Camelids possess antibodies with a conventional four-chain structure consisting of two heavy and two light chains (of subclass IgG1) but further they also generate heavy-chain only antibodies (of subclass IgG2 and 3) which are fully functional in antigen binding. In this study subclass-specific murine monoclonal antibodies specific to conventional camelid IgG1 and heavy-chain only IgG2/3 were generated and validated for the use as potent secondary detection reagents. The monoclonal antibodies are able to differentiate between all camelid IgGs, conventional four-chain camelid antibodies (of subclass IgG1) and exclusively heavy chain-only antibodies (of subclasses IgG2 and IgG3)...
March 2018: Veterinary Immunology and Immunopathology
Takehiro Abiko, Takahiro Tsuchikawa, Kengo Miyauchi, Masataka Wada, Noriaki Kyogoku, Toshiaki Shichinohe, Yoshihiro Miyahara, Shinichi Kageyama, Hiroaki Ikeda, Hiroshi Shiku, Satoshi Hirano
Since 2009, a cancer vaccine clinical trial was conducted with melanoma antigen gene-A4 as an immunogenic agent. The levels of IgG1, IgG2 and IgG3, which are known to be Type 1 T helper cell-associated antibodies, and the levels of IgG4 and IgE, which are known to be Type 2 T helper cell-associated antibodies, were measured and used as biomarkers for predicting therapeutic effect. The results of the present study indicated a strong positive correlation between IgG2 and IgG4, with a correlation coefficient of R=0...
March 2018: Oncology Letters
Henrique Tomaz Gonzaga, Daniela da Silva Nunes, Vanessa da Silva Ribeiro, Nágilla Daliane Feliciano, Jair Pereira da Cunha-Junior, Julia Maria Costa-Cruz
Strongyloidiasis is an important helminthiasis affecting million people worldwide. The aim of this study was to use sodium metaperiodate (MP) treatment to immunochemically characterize Strongyloides venezuelensis filariform larvae and use MP-treated heterologous antigen to detect IgG and subclasses in serum. Samples from individuals with definitive diagnosis of strongyloidiasis (n = 50), other parasitic diseases (n = 60) and negative endemic (n = 50) were tested. TG-ROC and two-way ANOVA were applied. MP-treatment resulted on differential localization of carbohydrates at larval structure and no carbohydrate content in saline extract (SE)...
February 15, 2018: Acta Tropica
Myrthe E Sonneveld, Carolien A M Koeleman, H Rosina Plomp, Manfred Wuhrer, C Ellen van der Schoot, Gestur Vidarsson
After albumin, immunoglobulin G (IgG) are the most abundant proteins in human serum, with IgG1 and IgG3 being the most abundant subclasses directed against protein antigens. The quality of the IgG-Fc-glycosylation has important functional consequences, which have been found to be skewed toward low fucosylation in some antigen-specific immune responses. This increases the affinity to IgG1-Fc-receptor (FcγR)IIIa/b and thereby directly affects downstream effector functions and disease severity. To date, antigen-specific IgG-glycosylation have not been analyzed for IgG3...
2018: Frontiers in Immunology
Fernando Sergio Leitao Filho, Seung Won Ra, Andre Mattman, Robert S Schellenberg, Gerard J Criner, Prescott G Woodruff, Stephen C Lazarus, Richard Albert, John E Connett, Meilan K Han, Fernando J Martinez, Janice M Leung, S F Paul Man, Shawn D Aaron, Robert M Reed, Don D Sin
BACKGROUND: The literature is scarce regarding the prevalence and clinical impact of IgG subclass deficiency in COPD. We investigated the prevalence of IgG subclass deficiencies and their association with exacerbations and hospitalizations using subjects from two COPD cohorts. METHODS: We measured IgG subclass levels using immunonephelometry in serum samples from participants enrolled in two previous COPD trials: Macrolide Azithromycin for Prevention of Exacerbations of COPD (MACRO; n = 976) and Simvastatin for the Prevention of Exacerbations in Moderate-to-Severe COPD (STATCOPE; n = 653)...
February 14, 2018: Respiratory Research
Dongwei He, Xiaoyan Fan, Boyi Liu, Yiqing Tian, Xiangmei Zhang, Lin Kang, Yan Tai, Shuzhen Liu, Qian Wang, Qingxia Li, Jianhui Cai
A murine monoclonal antibody (MAb-1) specific for GM3 has been generated by immunizing β3Gn-T5 knockout mice with purified GM3 ganglioside. The binding specificity of MAb-1 (IgG3 subclass) was established by an enzyme-linked immunosorbent assay (ELISA) and FACS and the antibody showed high binding specificity with GM3. Cell viability assay showed that MAb-1 significantly suppressed cell growth. Immunohistochemistry analysis revealed that MAb-1 was strongly expressed in human ovarian cancer tissues, whereas it was hardly expressed in normal tissues...
February 7, 2018: Scientific Reports
Marta Vidal, Ruth Aguilar, Joseph J Campo, Carlota Dobaño
BACKGROUND: Quantitative suspension arrays are powerful immunoassays to measure antibodies against multiple antigens in large numbers of samples in a short time and using few microliters. To identify antigen targets of immunity for vaccine development against complex microbes like Plasmodium falciparum, such technology allows the characterization of the magnitude and antigenic specificity of Ig isotypes and subclasses that are important for functional responses. However, standardized assays are not widely available...
January 31, 2018: Journal of Immunological Methods
Heather L Howie, Xiaohong Wang, Linda Kapp, Jenna Lebedev, Krystalyn E Hudson, James C Zimring
Methods designed to monitor humoral immune responses, in a variety of settings, typically use a broadly reactive detection reagent (e.g. polyclonal anti-Ig (immunoglobulin)) in order to characterize antibody responses. In the context of murine models of immunity, which are widely used, this would typically be antisera to mouse Ig or mouse IgG. However, there are 4 different subtypes of mouse IgG; thus, the validity of the above approach, as a general screen for humoral immune responses, depends upon the assumption that the antisera recognize all IgG subtypes...
January 27, 2018: Journal of Immunological Methods
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