Indirect Immunofluorescence Assay
Indirect Immunofluorescence Assay - Related Videos
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Source: Whitney Swanson1,2, Frances V. Sjaastad2,3, and Thomas S. Griffith1,2,3,4 1 Department of Urology, University of Minnesota, Minneapolis, MN 55455 2 Center for Immunology, University of Minnesota, Minneapolis, MN 55455 3 Microbiology, Immunology, and Cancer Biology Graduate Program, University of Minnesota, Minneapolis, MN 55455 4 Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455 Enzyme-linked immunosorbent assay (ELISA) is frequently used to measure the presence...
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CTC Immunofluorescence Assay : A Technique to Characterize Circulating Tumor Cells
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This video describes the Circulating Tumor Cells (CTC) Immunofluorescence assay, a technique to characterize the biomarkers on circulating tumor cells in non-small cell lung cancer patient samples. This assay could be used to monitor dynamic changes of the tumor and immune response, which may reflect the response to chemotherapy, radiation, and possible immunotherapy treatments.
FAQs
Signal formation occurs in two binding steps. The primary antibody first attaches to the target antigen, while a fluorophore-labeled secondary antibody then recognizes the bound primary antibody. When the prepared sample is viewed with a fluorescence microscope, the fluorophore produces a visible signal at the target’s location. This links antibody recognition with spatial visualization.
Signal intensity can increase because multiple secondary antibodies may bind to one primary antibody. Each secondary antibody carries a fluorophore, so several fluorescent labels can accumulate around a single target-bound primary antibody. The resulting brighter signal can make antigen localization easier to observe in fixed cells, tissues, or clinical samples.
The secondary antibody must recognize the primary antibody’s host species. A single labeled secondary reagent can detect different primary antibodies when those primary antibodies come from the same host species. This feature can simplify reagent selection and support repeated detection of targets with compatible primary antibodies, while maintaining fluorophore-based visualization.
Localization shows where a specific antigen or antibody-associated signal occurs within a fixed cell, tissue, or clinical sample. This spatial information can reveal protein distribution and help characterize cell structures rather than only indicating that the target is present. The observed pattern therefore connects molecular recognition with biological organization.
A typical workflow begins with a fixed cell, tissue, or clinical sample. Researchers apply a primary antibody so it can bind the target, then add a fluorophore-labeled secondary antibody that recognizes the primary antibody. Finally, they examine the sample with a fluorescence microscope to observe the resulting signal and its location.
The method is useful when researchers need to examine protein distribution, characterize cell structures, or identify antibody-related signals in clinical material. Clinicians and investigators also apply it to detect pathogen-specific antibodies and support autoimmune disease investigation. Its value comes from combining target-specific antibody binding with visible localization in the examined sample.