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IgA class switching enhances neutralizing potency against SARS-CoV-2 by increased antibody hinge flexibility.
Antiviral Res
January 2025
School of Public Health (Shenzhen), Shenzhen Campus of Sun Yat-Sen University, Shenzhen, China; Key Laboratory of Tropical Disease Control (Sun Yat-sen University), Ministry of Education; Shenzhen Key Laboratory of Pathogenic Microbes and Biosafety. Electronic address:
IgA antibodies are critical components of the mucosal immune barrier, providing essential first-line defense against viral infections. In this study, we investigated the impact of antibody class switching on neutralization efficacy by engineering recombinant antibodies of different isotypes (IgA1, IgG1) with identical variable regions from SARS-CoV-2 convalescent patients. A potent, broad-spectrum neutralizing monoclonal antibody CAV-C65 exhibited a ten-fold increase in neutralization potency upon switching from IgG1 to IgA1 monomer.
View Article and Find Full Text PDFIP-to-MS: An Unbiased Workflow for Antigen Profiling.
J Proteome Res
January 2025
Impact Proteomics, LLC., Pittsburgh, Pennsylvania 15206, United States.
Immunoprecipitation is among the most widely utilized methods in biomedical research, with applications that include the identification of antibody targets and associated proteins. The path to identifying these targets is not straightforward, however, and often requires the use of chemical cross-linking and/or gel electrophoresis to separate targets from an overabundance of immunoglobulin protein. Such experiments are labor intensive and often yield long lists of candidate antibody targets.
View Article and Find Full Text PDFQuaternized Nanofiber-Based Anion-Exchange Chromatography Membrane with Periodic Diagonal Surface Structure for Efficient Protein Separation.
ACS Appl Mater Interfaces
January 2025
Key Laboratory of Textile Fiber and Products, Ministry of Education, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University, Wuhan 430200, China.
Constructing a nanofibrous membrane with high flow rate surface pore structure and high-density ligand chemical structure is a promising strategy to balance the trade-off between high flow rates and high adsorption capacity for protein separation and purification. Herein, a nanofiber-based ion-exchange chromatography membrane with a periodic diagonal surface structure and high ionic strength ligands was fabricated using dispersion cross-linking, wet coating, and template printing with a three-wire diagonal woven mesh. For this membrane, EVOH nanofibers were used as skeleton, glutaraldehyde (GA) as cross-linking agent, and quaternized chitosan (QCS) as binder and functional ligand.
View Article and Find Full Text PDFPatterned Antigens on DNA Origami Controls the Structure and Cellular Uptake of Immune Complexes.
ACS Nano
January 2025
Institute of Biomedical Engineering, University of Toronto, Toronto M5S 2E3, Canada.
Immune complexes (ICs), formed via antibody (Ab)-antigen (Ag) binding, trigger diverse immune responses, which are critical for natural immunity and have uses for vaccines and immunotherapies. While IC-elicited immune responses depend on its structure, existing methods for IC synthesis produce heterogeneous assemblies, which limits control over their cellular interactions and pharmacokinetics. In this study, we demonstrate the use of DNA origami to create synthetic ICs with defined shape, size, and solubility by displaying Ags in prescribed spatial patterns.
View Article and Find Full Text PDFPolyphenol oxidase cross-linking enhances whey protein-induced systemic food allergy by regulating miRNA in CD4 T cells.
Food Funct
January 2025
State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, China.
Article Synopsis
- Whey protein contains allergenic proteins that affect its use in food products.
- Current research investigates how processing methods, like polyphenol oxidase cross-linking, change the allergenicity of protein mixtures.
- Findings show that mice consuming cross-linked whey protein exhibited more severe food allergies and intestinal injury, along with changes in immune cell composition and specific miRNA expressions, indicating potential biomarkers for milk allergy severity.
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