Cytotoxic Mediator Release
Cytotoxic Mediator Release - Related Videos
12:12
Methods to Assess Beta Cell Death Mediated by Cytotoxic T Lymphocytes
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Cited by 14 •
2011
Cell-mediated lymphocytotoxicity (CML) assays can be used to test autoreactive responses and study mechanisms of cell death in vitro. However, using live-cell confocal microscopic imaging techniques with fluorescent dyes, the type and kinetics of cell death as well as the pathways utilized can be studied in greater detail.
11:48
Assay for Cell Death: Chromium Release Assay of Cytotoxic Ability
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2023
Source: Frances V. Sjaastad1,2, Whitney Swanson2,3, and Thomas S. Griffith1,2,3,4 1 Microbiology, Immunology, and Cancer Biology Graduate Program, University of Minnesota, Minneapolis, MN 55455 2 Center for Immunology, University of Minnesota, Minneapolis, MN 55455 3 Department of Urology, University of Minnesota, Minneapolis, MN 55455 4 Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455 One of the main functions of the cells of the immune system is to remove target cells...
02:53
Calcein Acetoxymethyl Staining to Evaluate Natural Killer Cell-Mediated Cytotoxicity toward Cancer Cells
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2025
This video demonstrates an assay to measure the cytotoxicity of natural killer cells against cancer cells using the Calcein AM stain. The reduced number of fluorescent cancer cells following co-culture with natural killer cells indicates natural killer cell-mediated cytotoxicity toward cancer cells.
04:45
An Immunological Technique to Monitor Adjuvant-Mediated Cytotoxic T Lymphocyte Generation
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2025
The video demonstrates an immunological method to monitor in vivo adjuvant-induced cytotoxic T lymphocyte or CTL production. A mouse is pre-injected with genetically engineered, proliferative dye-stained donor CD8+ T lymphocytes. Subcutaneous injection of ovalbumin with adjuvants generates cytotoxic CD8+ T lymphocytes that are identified post-harvesting through immunostaining and flow cytometry.
03:14
An Assay for Bacterial Extracellular Protein-Mediated Cytotoxicity on PMNs
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2025
This video demonstrates an assay to investigate the cytotoxicity of proteins produced by Staphylococcus aureus, a pathogenic bacterium, on isolated human polymorphonuclear leukocytes (PMNs). The secreted cytotoxic proteins form pores on the PMN cell membrane, initiating cell death. Upon staining the dead cells using propidium iodide, flow cytometry is performed to quantify the dead cells and assess the cytotoxicity of the bacteria.
FAQs
Recognition begins when a natural killer cell or cytotoxic T lymphocyte contacts a susceptible target through receptor-mediated interactions. This contact organizes an immunological synapse, a specialized interface that focuses the response at the target-cell boundary. The synapse is important because it supports directed degranulation, concentrating cytotoxic molecules on the intended cell rather than releasing them indiscriminately.
Perforin and granzymes contribute sequentially to target-cell elimination. Perforin helps create pores in the target-cell membrane, providing a route for granzymes to act inside the cell. Granzymes then activate intracellular death pathways. Considering these molecules as complementary components clarifies why effective cytotoxicity depends on both membrane access and activation of internal cellular destruction.
Fas ligand provides an additional apoptosis-promoting pathway. When Fas ligand binds Fas on a target cell, that interaction can promote programmed cell death without being described solely through pore formation and granzyme delivery. Comparing the two routes helps researchers recognize that cytotoxic lymphocytes can engage more than one molecular mechanism when eliminating infected, damaged, or abnormal cells.
A useful conceptual sequence follows receptor-mediated target recognition, immunological synapse formation, directed degranulation, and activation of target-cell death pathways. Analysis should then consider whether perforin and granzymes, Fas ligand and Fas, or both provide the relevant signals. This sequence connects the initial cell-cell interaction with the eventual destruction of the target cell.
The process provides a mechanism for removing infected or abnormal cells, linking immune-cell recognition to target-cell destruction. In antiviral immunity, this supports elimination of infected targets; in antitumor immunity, it can contribute to removal of abnormal cells. Studying these settings shows how the same cytotoxic machinery operates across distinct immune challenges.
These contexts make cytotoxic mediator release relevant beyond its normal protective role. Infections may alter the setting in which infected targets are eliminated, while immunotherapies can influence immune-mediated target-cell destruction. Immune dysregulation raises questions about inappropriate or ineffective killing. Examining mediator release in these contexts helps connect cellular mechanisms with changes in immune outcomes.