Antigen Labeling
Antigen Labeling - Related Videos
09:49
Antigen Specific In Vivo Killing Assay using CFSE Labeled Target Cells
0 Views •
Cited by 39 •
2010
Many infections elicit a strong CTL response, but occasionally, the quantity of responding cells does not correlate to control of the pathogen1. One measure of CTL quality is their ability to kill specifically2. CFSE labeling of target cells can be used to investigate this CTL response quality in vivo3,4.
06:57
Development of an Antigen-driven Colitis Model to Study Presentation of Antigens by Antigen Presenting Cells to T Cells
0 Views •
Cited by 9 •
2016
In this antigen-driven colitis model, OT-II CD4+ T cells expressing a red fluorescent protein were adoptively transferred into RAG-/- mice that express a green fluorescent protein in mononuclear phagocytes (MPs). The hosts were challenged with Escherichia coli (E.coli) expressing the ovalbumin protein (OVA) fused to a cyan fluorescent protein (CFP).
05:04
Viral Antigen Microarray Assay to Detect Antibody Isotypes in Serum Against Viral Antigen
0 Views •
2025
In this video, we demonstrate the process for detecting antibody isotypes in multiple human serum samples using a microarray slide printed with antigenic subtypes of influenza virus strains.
08:32
Extraction of Tissue Antigens for Functional Assays
0 Views •
2012
A simple protocol for preparing extracts of human tissue to be used as a source of antigens in functional T-cell assays is described. This method allows T-cell responses to tissue-derived antigens to be measured in vitro.
08:28
Metabolic Labeling
0 Views •
2023
Metabolic labeling is used to probe the biochemical transformations and modifications that occur in a cell. This is accomplished by using chemical analogs that mimic the structure of natural biomolecules. Cells utilize analogs in their endogenous biochemical processes, producing compounds that are labeled. The label allows for the incorporation of detection and affinity tags, which can then be used to elucidate metabolic pathways using other biochemical analytical techniques, such as SDS-PAGE...
FAQs
The label remains associated with the antigen or with the antibody that recognizes it, so binding places the detectable tag at the target location. Fluorescent dyes, enzymes, biotin, and nanoparticles can then generate signals that reveal where the interaction occurred or how much target is present. This connection between molecular specificity and signal detection supports both visualization and measurement.
The label type determines how the antigen–antibody interaction will be detected and what kind of readout is possible. Fluorescent dyes support visual detection, whereas enzymes, biotin, and nanoparticles provide other detectable signals. Consequently, label selection should match the intended platform, such as microscopy, flow cytometry, or an immunoassay, and the desired balance between measurement and localization.
Labeling the antigen allows that target to be tracked as it binds a specific antibody, while labeling the antibody allows the antibody-bound target to be detected. Both strategies rely on complementary antigen–antibody recognition, but they answer different experimental questions. The choice depends on whether the study follows the antigen itself or uses antibody binding to identify and measure it.
A detectable signal is informative only when it is linked to the intended antigen–antibody interaction. Specific binding connects the label to the correct immune target, allowing researchers to identify antigen presence, characterize cellular responses, or quantify expression. In infection studies, this specificity is particularly important because it supports localization of pathogen-associated targets rather than merely recording an undirected signal.
A typical conceptual workflow is to select the antigen or antibody to be labeled, attach an appropriate detectable tag, allow specific binding to the complementary partner, and measure the resulting signal with a suitable platform. Researchers then interpret the signal as evidence of target presence, location, or expression. The exact readout depends on whether microscopy, flow cytometry, or an immunoassay is used.
Immunofluorescence microscopy uses labeled targets to provide spatial information, showing where an antigen or immune target is located. Flow cytometry supports analysis of labeled targets in cells and helps characterize cellular responses. Immunoassays use the generated signal for measurement. Together, these platforms extend antigen labeling from visual localization to cell-based characterization and quantitative assessment.
In infection research, labeled antigens or antibodies can help localize pathogen-associated targets and identify immune targets within experimental samples. The resulting signals support characterization of cellular responses, measurement of antigen expression, and evaluation of diagnostic or therapeutic strategies. These applications are valuable because labeling can combine molecular specificity with improved sensitivity and, in microscopy, spatial resolution.