Effector Cell Cytotoxicity
Effector Cell Cytotoxicity - Related Videos
08:39
Electroporation of Functional Bacterial Effectors into Mammalian Cells
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Cited by 7 •
2015
Electroporation was used to insert purified bacterial virulence effector proteins directly into living eukaryotic cells. Protein localization was monitored by confocal immunofluorescence microscopy. This method allows for studies on trafficking, function, and protein-protein interactions using active exogenous proteins, avoiding the need for heterologous expression in eukaryotic cells.
12:23
Analysis of Yersinia enterocolitica Effector Translocation into Host Cells Using Beta-lactamase Effector Fusions
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Cited by 5 •
2015
Effector translocation into host cells via a type III secretion system is a common virulence strategy among gram-negative bacteria. A beta-lactamase effector fusion based assay for quantitative analysis of translocation was applied. In Yersinia infected cells, conversion of a FRET reporter by the beta-lactamase is monitored using laser scanning microscopy.
09:28
Quantitative High-throughput Single-cell Cytotoxicity Assay For T Cells
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Cited by 25 •
2013
We describe a single-cell high-throughput assay to measure cytotoxicity of T cells when incubated with tumor target cells. This method employs a dense, elastomeric array of sub-nanoliter wells (~100,000 wells/array) to spatially confine the T cells and target cells at defined ratios and is coupled to fluorescence microscopy to monitor effector-target conjugation and subsequent apoptosis.
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...
03:14
Obtaining Cytotoxic Amyloids Following Bacterial Infection of Rat Pulmonary Endothelial Cells
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2025
Source: Balczon, R., et al. Methods for Detecting Cytotoxic Amyloids Following Infection of Pulmonary Endothelial Cells by Pseudomonas aeruginosa. J. Vis. Exp. (2018)This video demonstrates the procedure for generating cytotoxic supernatant from pulmonary endothelial cells following infection with Pseudomonas aeruginosa. It outlines how bacterial effector proteins disrupt host cell structure and induce the release of cytotoxic amyloid oligomers into the supernatant.
FAQs
Recognition depends on the target-cell signal available to each effector population. Cytotoxic T lymphocytes respond when their receptors engage peptide–MHC class I complexes, linking killing to antigen presentation. Natural killer cells instead detect altered patterns of self. This distinction helps investigators compare antigen-specific cellular defense with responses to abnormal cellular states in infection and disease.
After recognition, the effector cell forms an immunological synapse with its target, creating a focused interface for attack. Perforin and granzymes are released at this site, while Fas can activate a death-receptor pathway. Together, these routes initiate target-cell apoptosis, allowing cytotoxic activity to eliminate selected cells through a regulated process rather than indiscriminate tissue destruction.
The route of recognition affects how immune responses are interpreted. Cytotoxic T-cell activity reflects detection through peptide–MHC class I, whereas natural killer-cell activity reflects altered patterns of self. Studying both is therefore important when infection changes cellular signals or when abnormal cells evade one recognition strategy. The comparison can also help distinguish protective cytotoxicity from immune-related tissue injury.
Measurements of this activity provide an indicator of how effectively immune effector cells destroy selected targets. In infection studies, the results can clarify antiviral defense and reveal whether immune evasion may be limiting target-cell destruction. The same measurements can support investigations of tissue injury by showing how cytotoxic responses relate to damage in affected tissues.
Beyond infection research, analysis of this activity informs cancer immunotherapy and vaccine development. It also supports studies of immune dysfunction by connecting cellular killing capacity with failures or excessive effects of host defense. Because the process includes defined recognition and death-signaling pathways, researchers can relate immune-cell behavior to protective responses, therapeutic approaches, or abnormal immune outcomes.
Targeted apoptosis can remove infected, abnormal, or potentially cancerous cells and thereby contribute to tissue health. However, immunology and infection studies also examine tissue injury, making it important to interpret cytotoxic activity in context. The same capacity that protects against disease can be associated with damage when immune responses affect tissues, making this balance an important research outcome.