Perforin Granzymes
Perforin Granzymes - Related Videos
09:16
A High Yield and Cost-efficient Expression System of Human Granzymes in Mammalian Cells
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Cited by 13 •
2015
We describe here a cost-efficient granzyme expression system using HEK293T cells that produces high yields of pure, fully glycosylated and enzymatically active protease.
05:20
A Colorimetric Assay that Specifically Measures Granzyme B Proteolytic Activity: Hydrolysis of Boc-Ala-Ala-Asp-S-Bzl
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Cited by 12 •
2014
We describe a simple, quantitative colorimetric assay that specifically measures the proteolytic activity of human, mouse or rat Granzyme B (GzmB). This protocol can be easily adapted for determining protease activity of other granule serine proteases by the hydrolysis of other synthetic peptide substrates with an appropriate recognition sequence.
04:41
Killing K562 Cells by Peripheral Blood Mononuclear Cells Exposed to Tobacco Product Preparations
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2025
In this video, we study the effect of a whole smoke-conditioned medium, a combustible tobacco product preparation, on K562 cell killing by effector peripheral blood mononuclear cells.
02:40
Natural Killer Cell-Mediated Cytotoxicity Assay Sample Preparation for Flow Cytometric Analysis
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2025
This video demonstrates the lytic activity of natural killer cells against fluorescently-stained target cells. The method enables NK cell-induced cytotoxicity measurement by staining dead cells and using a flow cytometer to quantify live and dead target cells.
03:50
An Ex Vivo Technique to Induce Neuronal Death via Oligodendrocyte-Specific CD8+ T Cells
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2025
This video demonstrates an ex vivo technique to induce brain cell death mediated through cytotoxic CD8+ T cells. Upon obtaining brain slices, activated oligodendrocyte-directed CD8+ T cells are transferred onto the slices to target the myelin sheath and oligodendrocytes. Post-incubation, the damage to myelin and neuronal death can be assessed histologically in the regions of interest.
FAQs
Recognition at the immunological synapse provides the targeting step that focuses cytotoxic activity on a selected cell. Cytotoxic T lymphocytes and natural killer cells first identify an infected, damaged, or abnormal target, then organize the interaction at this specialized contact site. This spatial coordination helps concentrate killing and limits collateral damage to nearby cells.
Perforin and granzymes perform complementary tasks rather than interchangeable ones. Perforin disrupts the target-cell membrane, creating the access needed for granzymes to enter. The granzymes then act as serine proteases on intracellular substrates and signaling pathways, converting membrane access into an apoptosis program. Separating these roles explains why coordinated activity is central to efficient target-cell elimination.
Apoptosis matters because it provides an intracellular route to target-cell elimination after granzyme entry. By activating substrates and signaling pathways inside the target, granzymes initiate programmed cell death rather than relying only on the initial membrane disruption. In immune surveillance, this sequence links recognition to a controlled outcome against infected, damaged, or abnormal cells.
Abnormal activity is associated with immunodeficiency, autoimmune disease, and cancer, showing that the pathway has consequences across distinct immune settings. Studying it can connect impaired cytotoxic defense with inappropriate immune responses or altered control of abnormal cells. This broad disease relevance makes pathway regulation important in biology and in research on immune dysfunction.
A typical mechanistic sequence begins with immune recognition, proceeds through formation of an immunological synapse, and then separates into two linked effector steps. Perforin acts at the target-cell membrane, while granzymes gain access to the interior and activate apoptosis. This sequence provides a framework for analyzing how cytotoxic cell killing is coordinated from recognition to outcome.
The pathway is especially relevant when the question concerns immune surveillance, viral defense, or elimination of abnormal cells. Researchers can examine how cytotoxic T lymphocytes and natural killer cells identify targets, coordinate membrane disruption, and trigger apoptosis. These observations help relate cellular effector activity to immune regulation and support studies of cancer and immunotherapy.