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https://www.readbyqxmd.com/read/28723905/evolution-of-anti-trypanosoma-cruzi-antibody-production-in-patients-with-chronic-chagas-disease-correlation-between-antibody-titers-and-development-of-cardiac-disease-severity
#1
Ingebourg Georg, Alejandro Marcel Hasslocher-Moreno, Sergio Salles Xavier, Marcelo Teixeira de Holanda, Eric Henrique Roma, Maria da Gloria Bonecini-Almeida
Chagas disease is one of the most important endemic infections in Latin America affecting around 6-7 million people. About 30-50% of patients develop the cardiac form of the disease, which can lead to severe cardiac dysfunction and death. In this scenario, the identification of immunological markers of disease progression would be a valuable tool for early treatment and reduction of death rates. In this observational study, the production of anti-Trypanosoma cruzi antibodies through a retrospective longitudinal follow-up in chronic Chagas disease patients´ cohort and its correlation with disease progression and heart commitment was evaluated...
July 19, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28723675/tumor-antigen-ca125-suppresses-antibody-dependent-cellular-cytotoxicity-adcc-via-direct-antibody-binding-and-suppressed-fc-%C3%AE-receptor-engagement
#2
J Bradford Kline, Rina P Kennedy, Earl Albone, Qimin Chao, Shawn Fernando, Jennifer M McDonough, Katherine Rybinski, Wenquan Wang, Elizabeth B Somers, Charles Schweizer, Luigi Grasso, Nicholas C Nicolaides
Cancers employ a number of mechanisms to evade host immune responses. Here we report the effects of tumor-shed antigen CA125/MUC16 on suppressing IgG1-mediated antibody-dependent cellular cytotoxicity (ADCC). This evidence stems from prespecified subgroup analysis of a Phase 3 clinical trial testing farletuzumab, a monoclonal antibody to folate receptor alpha, plus standard-of-care carboplatin-taxane chemotherapy in patients with recurrent platinum-sensitive ovarian cancer. Patients with low serum CA125 levels treated with farletuzumab demonstrated improvements in progression free survival (HR 0...
July 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/28720382/activated-leukocyte-cell-adhesion-molecule-is-involved-in-excitatory-synaptic-transmission-and-plasticity-in-the-rat-spinal-dorsal-horn
#3
Eun-Sung Park, Sang-Min Jeon, Haein Weon, Hee-Jung Cho, Dong-Ho Youn
Activated leukocyte cell adhesion molecule (ALCAM), a member of type I transmembrane immunoglobulin superfamily of cell adhesion molecule, is expressed in the surface membrane of various cell types including neurons. In the spinal cord dorsal horn (DH), the first gate for the sensory and pain transmission to the brain, the expression and function of ALCAM have not been known yet. Therefore, we here investigate the synaptic function of ALCAM in the substantia gelatinosa (lamina II) of the spinal DH, as well as its expression in the DH...
July 15, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28718065/structure-function-relationships-of-protein-lipopeptide-complexes-and-influence-on-immunogenicity
#4
Acep R Wijayadikusumah, Lucy C Sullivan, David C Jackson, Brendon Y Chua
The lipopeptide, R4Pam2Cys, associates electrostatically with soluble protein antigens and significantly enhances their ability to induce protective humoral and cell-mediated responses. We demonstrate that antibody titers elicited by the antigen ovalbumin (OVA) associated with R4Pam2Cys are higher than those elicited by OVA in the presence of alum and comparable to those elicited by OVA formulated with complete Freund's adjuvant (CFA). The hierarchy of anti-OVA antibody avidities was CFA > R4Pam2Cys = alum...
July 17, 2017: Amino Acids
https://www.readbyqxmd.com/read/28716815/exposure-response-analyses-of-ramucirumab-from-two-randomized-phase-iii-trials-of-second-line-treatment-for-advanced-gastric-or-gastroesophageal-junction-cancer
#5
Josep Tabernero, Atsushi Ohtsu, Kei Muro, Eric Van Cutsem, Sang Cheul Oh, György Bodoky, Yasuhiro Shimada, Shuichi Hironaka, Jaffer A Ajani, Jiri Tomasek, Howard Safran, Kumari Chandrawansa, Yanzhi Hsu, Michael Heathman, Azhar Khan, Lan Ni, Allen S Melemed, Ling Gao, David Ferry, Charles S Fuchs
Ramucirumab is an IgG1 monoclonal antibody specific for the vascular endothelial growth factor receptor-2. Ramucirumab, 8 mg/kg every two weeks, administered as monotherapy (REGARD) or in combination with paclitaxel (RAINBOW), was safe and effective in patients with previously treated advanced gastric or gastroesophageal junction (GEJ) cancer. We evaluated exposure-efficacy and exposure-safety relationships of ramucirumab from two randomized, placebo-controlled phase III trials. Sparse pharmacokinetic samples were collected and a population pharmacokinetic analysis was conducted to predict ramucirumab minimum trough concentration at steady-state (Cmin,ss)...
July 17, 2017: Molecular Cancer Therapeutics
https://www.readbyqxmd.com/read/28713616/baicalein-wogonin-and-scutellaria-baicalensis-ethanol-extract-alleviate-ovalbumin-induced-allergic-airway-inflammation-and-mast-cell-mediated-anaphylactic-shock-by-regulation-of-th1-th2-imbalance-and-histamine-release
#6
Thi Tho Bui, Chun Hua Piao, Chang Ho Song, Chang-Hyun Lee, Hee Soon Shin, Ok Hee Chai
Asthma is characterized by chronic inflammation, goblet cell hyperplasia, the aberrant production of the Th2 cytokines, and eosinophil infiltration into the lungs. In this study, we examined the effects of baicalein, wogonin, and Scutellaria baicalensis ethanol extract on ovalbumin (OVA)-induced asthma by evaluating Th1/Th2 cytokine levels, histopathologic analysis, and compound 48/80-induced systemic anaphylaxis and mast cell activation, focusing on the histamine release from rat peritoneal mast cells. Baicalein, wogonin, and S...
June 2017: Anatomy & Cell Biology
https://www.readbyqxmd.com/read/28713374/the-selective-phosphoinoside-3-kinase-p110%C3%AE-inhibitor-ipi-3063-potently-suppresses-b-cell-survival-proliferation-and-differentiation
#7
Honyin Chiu, Sharmila Mallya, Phuongthao Nguyen, Annie Mai, Leandra V Jackson, David G Winkler, Jonathan P DiNitto, Erin E Brophy, Karen McGovern, Jeffery L Kutok, David A Fruman
The class I phosphoinoside-3-kinases (PI3Ks) are important enzymes that relay signals from cell surface receptors to downstream mediators driving cellular functions. Elevated PI3K signaling is found in B cell malignancies and lymphocytes of patients with autoimmune disease. The p110δ catalytic isoform of PI3K is a rational target since it is critical for B lymphocyte development, survival, activation, and differentiation. In addition, activating mutations in PIK3CD encoding p110δ cause a human immunodeficiency known as activated PI3K delta syndrome...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28710796/plant-produced-zika-virus-envelope-protein-elicits-neutralizing-immune-responses-that-correlate-with-protective-immunity-against-zika-virus-in-mice
#8
Ming Yang, Haiyan Sun, Huafang Lai, Jonathan Hurtado, Qiang Chen
The global Zika virus (ZIKV) outbreak and its link to fetal and newborn microcephaly and severe neurological complications in adults call for the urgent development of ZIKV vaccines. In response, we developed a subunit vaccine based on the ZIKV envelope (E) protein and investigated its immunogenicity in mice. Transient expression of ZIKV E (zE) resulted in its rapid accumulation in leaves of Nicotiana benthamiana plants. Biochemical analysis revealed that plant-produced ZIKV E (PzE) exhibited specific binding to a panel of monoclonal antibodies that recognize various zE conformational epitopes...
July 15, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28708895/yeast-expressed-recombinant-as16-protects-mice-against-ascaris-suum-infection-through-induction-of-a-th2-skewed-immune-response
#9
Junfei Wei, Leroy Versteeg, Zhuyun Liu, Brian Keegan, Ana Clara Gazzinelli-Guimarães, Ricardo T Fujiwara, Neima Briggs, Kathryn M Jones, Ulrich Strych, Coreen M Beaumier, Maria Elena Bottazzi, Peter J Hotez, Bin Zhan
BACKGROUND: Ascariasis remains the most common helminth infection in humans. As an alternative or complementary approach to global deworming, a pan-anthelminthic vaccine is under development targeting Ascaris, hookworm, and Trichuris infections. As16 and As14 have previously been described as two genetically related proteins from Ascaris suum that induced protective immunity in mice when formulated with cholera toxin B subunit (CTB) as an adjuvant, but the exact protective mechanism was not well understood...
July 14, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28702458/cocoa-diet-and-antibody-immune-response-in-preclinical-studies
#10
REVIEW
Mariona Camps-Bossacoma, Malen Massot-Cladera, Mar Abril-Gil, Angels Franch, Francisco J Pérez-Cano, Margarida Castell
The ability of cocoa to interact with the immune system in vitro and in vivo has been described. In the latter context, a cocoa-enriched diet in healthy rats was able to modify the immune system's functionality. This fact could be observed in the composition and functionality of lymphoid tissues, such as the thymus, spleen, and lymph nodes. Consequently, immune effector mechanisms, such as antibody synthesis, were modified. A cocoa-enriched diet in young rats was able to attenuate the serum levels of immunoglobulin (Ig) G, IgM, and IgA and also the intestinal IgM and IgA secretion...
2017: Frontiers in Nutrition
https://www.readbyqxmd.com/read/28701895/decreased-serum-concentration-of-total-igg-is-related-to-tumor-progression-in-gastric-cancer-patients
#11
Hiroaki Saito, Kozo Miyatani, Yusuke Kono, Yuki Murakami, Hirohiko Kuroda, Tomoyuki Matsunaga, Yoji Fukumoto, Shuichi Takano, Tomohiro Osaki, Yoshiyuki Fujiwara
BACKGROUND: There is accumulating evidence that shows cell-mediated immunity regulated by T cells is impaired in cancer patients. Unfortunately, the mechanisms by which B cells participate in tumor immunity are only partially understood. METHODS: The serum concentration of Immunoglobulin G (IgG) was measured by Enzyme-Linked ImmunoSorbent Assay (ELISA) in patients with gastric cancer. Immunohistochemistry was also performed using the anti- cluster of differentiation (CD)134 antibody to evaluate the number of plasma cells in the tumor tissue...
June 2017: Yonago Acta Medica
https://www.readbyqxmd.com/read/28700824/application-of-hdx-ms-to-biopharmaceutical-development-requirements-improved-sensitivity-to-detection-of-conformational-changes
#12
Lea Bonnington, Ingo Lindner, Ulrich Gilles, Tobias Kailich, Dietmar Reusch, Patrick Bulau
The usefulness of the higher-order structure information provided by hydrogen/deuterium exchange mass spectrometry (HDX-MS) in the protein therapeutic field is undisputed, however its applicability as a method for critical quality and comparability assessment has until now not been demonstrated. Here we present results demonstrating for the first time the applicability of the HDX-MS technique to monitor structural changes due to methionine oxidation at sensitivity levels realistic to the requirements of biopharmaceutical research and development...
July 12, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28700270/h2mab-77-is-a-sensitive-and-specific-anti-her2-monoclonal-antibody-against-breast-cancer
#13
Shunsuke Itai, Yuki Fujii, Mika K Kaneko, Shinji Yamada, Takuro Nakamura, Miyuki Yanaka, Noriko Saidoh, Yao-Wen Chang, Saori Handa, Maki Takahashi, Hiroyoshi Suzuki, Hiroyuki Harada, Yukinari Kato
Human epidermal growth factor receptor 2 (HER2) plays a critical role in the progression of breast cancers, and HER2 overexpression is associated with poor clinical outcomes. Trastuzumab is an anti-HER2 humanized antibody that leads to significant survival benefits in patients with HER2-positive metastatic breast cancers. In this study, we developed novel anti-HER2 monoclonal antibodies (mAbs) and characterized their efficacy in flow cytometry, Western blot, and immunohistochemical analyses. Initially, we expressed the full length or ectodomain of HER2 in LN229 glioblastoma cells and then immunized mice with ectodomain of HER2 or LN229/HER2, and performed the first screening by enzyme-linked immunosorbent assays using ectodomain of HER2...
July 12, 2017: Monoclonal Antibodies in Immunodiagnosis and Immunotherapy
https://www.readbyqxmd.com/read/28694069/engineering-aglycosylated-igg-variants-with-wild-type-or-improved-binding-affinity-to-human-fc-gamma-riia-and-fc-gamma-riiias
#14
Tiffany F Chen, Stephen L Sazinsky, Damian Houde, David J DiLillo, Julie Bird, Kevin K Li, George T Cheng, Huawei Qiu, John R Engen, Jeffrey V Ravetch, K Dane Wittrup
The binding of human IgG1 to human Fc gamma receptors (hFcγR) is highly sensitive to the presence of a single N-linked glycosylation site at asparagine 297 of the Fc, with deglycosylation resulting in a complete loss of hFcγR binding. Previously, we demonstrated that aglycosylated human IgG1 Fc variants can engage the human FcγRII class of the low-affinity hFcγRs, demonstrating that N-linked glycosylation of the Fc is not a strict requirement for hFcγR engagement. In the present study, we demonstrate that aglycosylated IgG variants can be engineered to productively engage with FcγRIIIA, as well as the human Fc gamma RII subset...
July 7, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28691538/olaratumab-for-soft-tissue-sarcoma
#15
Diego Teyssonneau, Antoine Italiano
Soft tissue sarcomas (STS) are rare malignant tumors. Unfortunately, the first-line doxorubicin-based treatment has not been improved since the 1970s. Platelet-derived growth factor (PDGF) receptor alpha (PDGFR-α) and its ligands are co-expressed in many types of cancer, including sarcomas. They are involved in stimulating growth and regulating stromal-derived fibroblasts and angiogenesis. PDGFR-α and its ligand may play an important role in tumorigenesis and be a potential target in the treatment of sarcomas...
July 10, 2017: Expert Opinion on Biological Therapy
https://www.readbyqxmd.com/read/28687406/comparative-efficacy-and-toxicity-of-two-vaccine-candidates-against-sporothrix-schenckii-using-either-montanide%C3%A2-pet-gel-a-or-aluminum-hydroxide-adjuvants-in-mice
#16
Deivys Leandro Portuondo, Alexander Batista-Duharte, Lucas Souza Ferreira, Cleverton Roberto de Andrade, Camila Quinello, Damiana Téllez-Martínez, Maria Luiza de Aguiar Loesch, Iracilda Zeppone Carlos
Sporotrichosis is an important zoonosis in Brazil and the most frequent subcutaneous mycosis in Latin America, caused by different Sporothrix species. Currently, there is no effective vaccine available to prevent this disease. In this study, the efficacy and toxicity of the adjuvant Montanide™ Pet Gel A (PGA) formulated with S. schenckii cell wall proteins (ssCWP) was evaluated and compared with that of aluminum hydroxide (AH). Balb/c mice received two subcutaneous doses (1st and 14th days) of either the unadjuvanted or adjuvanted vaccine candidates...
July 4, 2017: Vaccine
https://www.readbyqxmd.com/read/28686149/enhanced-opsonisation-of-rhesus-d-positive-human-red-blood-cells-by-recombinant-polymeric-immunoglobulin-g-anti-g-antibodies
#17
Dylana Díaz-Solano, Jaheli Fuenmayor, Ramon F Montaño
BACKGROUND: Anti-RhD antibodies (anti-D) are important in the prophylaxis of haemolytic disease of the foetus and newborn (HDFN) due to RhD incompatibility. Current preparations of anti-D are sourced from hyperimmune human plasma, so its production carries a risk of disease and is dependent on donor availability. Despite the efforts to develop a monoclonal preparation with similar prophylactic properties to the plasma-derived anti-D, no such antibody is yet available. Here we studied the agglutinating, opsonic and haemolytic activities of two recombinant polymeric immunoglobulins (Ig) against the G antigen of the Rh complex...
May 30, 2017: Blood Transfusion, Trasfusione del Sangue
https://www.readbyqxmd.com/read/28679991/acquired-immune-mediated-von-willebrand-syndrome-accompanied-by-antiphospholipid-syndrome
#18
Nobuhiko Kobayashi, Yoshiyuki Ogawa, Kunio Yanagisawa, Takuma Ishizaki, Hideki Uchiumi, Nobuaki Suzuki, Tadashi Matsushita, Akitada Ichinose, Hiroshi Handa
Acquired von Willebrand syndrome (AvWS) is a rare bleeding disorder with laboratory findings resembling those of congenital von Willebrand disease. AvWS usually occurs in association with a variety of underlying disorders, such as lymphoproliferative disease or cardiovascular disease, but autoimmune AvWS is very rare. We now describe the case of a 42-year-old woman with autoimmune AvWS with concurrent antiphospholipid syndrome (APS). The patient was suffering from epistaxis and menorrhagia from few years prior to referral...
2017: [Rinshō Ketsueki] the Japanese Journal of Clinical Hematology
https://www.readbyqxmd.com/read/28679035/partially-hydrolyzed-whey-proteins-prevent-clinical-symptoms-in-a-cow-s-milk-allergy-mouse-model-and-enhance-regulatory-t-and-b-cell-frequencies
#19
M B Gea Kiewiet, B C A M van Esch, J Garssen, M M Faas, P de Vos
SCOPE: Partially hydrolyzed cow's milk proteins are used to prevent cow's milk allergy in children. Here we studied the immunomodulatory mechanisms of partial cow's milk hydrolysates in vivo. METHODS AND RESULTS: Mice were sensitized with whey or partially hydrolyzed whey using cholera toxin. Whey-specific IgE levels were measured to determine sensitization and immune cell populations from spleen, mesenteric lymph nodes and Peyer's patches after oral whey administration were measured by flowcytometry...
July 5, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28678921/identification-of-ige-and-igg1-specific-antigens-in-echinococcus-granulosus-cyst-fluid
#20
S Li, R Qian, S Wang, J Ye, H Zheng
Cystic echinococcosis (CE) is an anthropozoonotic disease with worldwide distribution and is caused by the cestode Echinococcus granulosus. Anaphylactic shock induced by CE rupture is a serious complication especially in patients with hydatid infections, as the resulting leakage of fluid contains highly toxic endogenous antigen. We aimed to isolate and identify the antigens of specific IgE and IgG1 (sIgE and sIgG1) in E. granulosus cyst fluid (EgCF). Crude antigen for EgCF was prepared from E. granulosus-infected sheep liver...
July 3, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
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