Antigen Specific Assay
Antigen Specific Assay - Related Videos
11:49
Trans-vivo Delayed Type Hypersensitivity Assay for Antigen Specific Regulation
0 Views •
Cited by 19 •
2013
We describe a valuable diagnostic assay that could potentially be used to decide the withdrawal of immunosuppression after transplant without elevated risk of graft rejection. The assay uses the principles of Delayed Type Hypersensitivity and provides accurate assessment of both donor specific effector and regulatory immune responses mounted by recipients.
06:20
An Assay for Cell Cycle Analysis of Antigen-Specific CD8+ T Cells
0 Views •
2025
This video demonstrates an assay to analyze antigen-specific CD8+ T cells in different cell cycle stages. Fluorescently-labeled viable cells are selected using flow cytometry, and the cells in the different cell cycle stages are identified by their DNA content using antibodies against cell proliferation-associated nuclear protein and a nucleic acid stain.
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.
07:05
In Vivo Assay for Detection of Antigen-specific T-cell Cytolytic Function Using a Vaccination Model
0 Views •
Cited by 4 •
2017
The goal of this protocol is to allow for detection of in vivo antigen-specific killing of a target cell in a murine model.
03:32
A Technique for the Generation of Antigen-Specific CAR T Cells
0 Views •
2025
This video demonstrates a technique for generating antigen-specific chimeric antigen receptor (CAR) T cells through retroviral transduction. Activated murine CD8+ T cells are added to a microwell plate coated with recombinant fibronectin fragments. Retroviral vectors containing transgenic RNA encoding an antigen-specific chimeric antigen receptor (CAR) are then introduced, and the plate is centrifuged to facilitate transduction. After incubation, the transduced cells express antigen-specific...
FAQs
Specificity is assessed by measuring the response produced when antibodies or immune cells encounter a defined antigen under controlled conditions. A measurable reaction linked to that antigen provides evidence of targeted recognition, whereas nonspecific immune activity may not show the same antigen-dependent pattern. This distinction helps investigators determine whether an observed response is relevant to a particular pathogen, vaccine component, or immune target.
The assay design determines whether the readout reflects antibody binding, cytokine release, immune-cell proliferation, or another response. Binding measurements describe recognition by antibodies, while cytokine release and proliferation indicate functional responses from immune cells. Selecting among these outcomes allows researchers to examine different dimensions of immunity and compare whether samples differ in recognition, cellular activity, or both.
Antibody-focused formats examine how antibodies interact with the defined antigen, supporting characterization of serological responses. Immune-cell-focused formats expose cells to the antigen and evaluate outcomes such as cytokine release or proliferation. The distinction matters because antibody and cellular responses represent different aspects of immunity, so the appropriate design depends on whether the study concerns serology, T-cell activity, or broader immune characterization.
Controlled conditions make responses more comparable across samples by keeping the antigen exposure and measurement context consistent. This supports meaningful evaluation of immune specificity and helps distinguish differences between samples from differences in the assay environment. In research, standardized conditions are particularly important when comparing immune responses during pathogen exposure studies, vaccine evaluation, or investigations of diagnostic performance.
A typical workflow begins by selecting a defined antigen and an appropriate antibody- or immune-cell-based assay design. The sample is then exposed to that antigen under controlled conditions, followed by measurement of a selected response, such as binding, cytokine release, or proliferation. The resulting signal is compared across samples to characterize the presence or relative strength of antigen-directed immunity.
These assays are useful for serological testing, vaccine evaluation, and studies of pathogen exposure. They can determine whether samples contain responses directed toward a relevant antigen and allow investigators to compare responses across individuals or experimental groups. Such comparisons help characterize immune responses associated with exposure or vaccination without relying only on measures of general immune activity.
Results can support investigations of protection, disease mechanisms, and diagnostic performance by showing how strongly and specifically samples respond to a defined antigen. Researchers may compare antibody or T-cell responses across samples, examine immune recognition after pathogen exposure, or evaluate whether an assay distinguishes targeted responses reliably. Interpretation remains tied to the measured outcome, such as binding, cytokine release, or proliferation.