Cell Mediated Lymphocytotoxicity
Cell Mediated Lymphocytotoxicity - Related Videos
14:22
Lentiviral-mediated Knockdown During Ex Vivo Erythropoiesis of Human Hematopoietic Stem Cells
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Cited by 19 •
2011
An ex vivo protocol to generate mature human red blood cells from hematopoietic stem/progenitors is described. Additionally we describe an efficient lentiviral-delivery method to knockdown the transcription factor TAL1 in primary erythroid cells. The efficiency of lentivirus mediated gene delivery is demonstrated using GFP expressing viruses.
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.
03:45
Quantification of Inflammatory Mediators in Infected Human Tissue-Derived Cells
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2025
This video demonstrates the quantification of inflammatory mediators during infection by incubating human lung-tissue-derived immune cells with Haemophilus influenzae. Flow cytometry is used to measure cytokine fluorescence in labeled lymphocytes, correlating with the production of pro-inflammatory cytokines in response to bacterial infection.
11:35
Selection-dependent and Independent Generation of CRISPR/Cas9-mediated Gene Knockouts in Mammalian Cells
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Cited by 6 •
2017
Recent advances in the ability to genetically manipulate somatic cell lines hold great potential for basic and applied research. Here, we present two approaches for CRISPR/Cas9 generated knockout production and screening in mammalian cell lines, with and without the use of selectable markers.
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.
FAQs
Cytotoxic T lymphocytes depend on antigen presentation through major histocompatibility complex class I molecules. They recognize antigen-derived peptides displayed on target cells, providing the specificity needed to direct killing toward infected or abnormal cells. This mechanism links intracellular antigen detection to selective elimination and distinguishes CTL activity from responses that do not use this recognition route.
Natural killer cells use a different decision system: they respond to cellular stress or reduced self-signaling rather than the antigen-peptide recognition used by cytotoxic T lymphocytes. This allows them to target cells showing abnormal or diminished normal identity signals. In infection and tumor surveillance, that complementary recognition broadens lymphocyte-mediated control of potentially dangerous cells.
Once a target is selected, lymphocytes can initiate apoptosis through perforin and granzymes or through death-receptor pathways. Apoptosis is a programmed form of cell death, so these mechanisms activate defined routes that eliminate the target cell. Their involvement helps explain how lymphocytes convert target recognition into a controlled cellular outcome during immune responses.
Direct lymphocyte killing does not require antibody-mediated activity. Instead, the effector lymphocyte itself recognizes or responds to features of the target and activates a killing pathway. This distinction matters when interpreting immune responses, because a measured cytotoxic effect can reflect direct lymphocyte action rather than an antibody-dependent mechanism.
Laboratory cytotoxicity assays are designed to measure how effectively lymphocytes kill target cells. Their central readout is the extent of target-cell destruction under the tested conditions, allowing investigators to compare immune activity between experimental settings. The assay converts a cellular interaction into measurable evidence about lymphocyte function, while not by itself identifying every recognition pathway involved.
These assays support research into immune function, vaccine responses, cancer immunotherapy, and infection-related disease. In each setting, measured killing activity provides a way to examine whether lymphocytes respond effectively to relevant targets. The approach is especially useful when researchers need functional evidence of cytotoxic capacity rather than information based only on recognition or immune-cell presence.
In immunology and infection research, this process connects cellular recognition with outcomes across several settings. It can help control viral infections, contribute to elimination of emerging tumor cells, and participate in transplant rejection. These outcomes reflect the target-cell context: the same cytotoxic capability can support protective surveillance yet become harmful when transplanted tissue is treated as foreign.