Thymocyte Apoptosis
Thymocyte Apoptosis - Related Videos
05:36
Analysis of Efferocytosis of Apoptotic Thymocytes by Peritoneal Macrophages
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2025
This video demonstrates a procedure for analyzing peritoneal macrophage-mediated efferocytosis of apoptotic mouse thymocytes by fluorescence microscopy.
06:42
Identifying Kinase Inhibitors that Modulate the Thymocyte Response to Strong TCR Signals
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2025
In this video, we describe a method to identify the small-molecule kinase inhibitors that modulate the apoptosis of self-reactive CD4+CD8+ double-positive immature thymocytes. Apoptosis is induced in the double-positive thymocytes by activating them with anti-CD3- and anti-CD28-coated magnetic beads; this is followed by a small-molecule inhibitor treatment and flow cytometry analysis to detect if the inhibitors modulate the apoptotic marker expression.
07:42
Activation of Apoptosis by Cytoplasmic Microinjection of Cytochrome c
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Cited by 15 •
2011
In this protocol, we describe the direct cytoplasmic microinjection of cytochrome c protein into fibroblasts and primary sympathetic neurons. This technique allows for the introduction of cytochrome c protein into the cytoplasm of cells and mimics the release of cytochrome c from mitochondria, which occurs during apoptosis.
01:30
Apoptosis
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2023
Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size reduction of the tissue.
06:58
Synthesis of an In vivo MRI-detectable Apoptosis Probe
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Cited by 3 •
2012
Early detection of apoptosis may identify at-risk cell populations in a variety of diseases. Here we demonstrate a method to link an early apoptosis-detection protein (Annexin V) to a MRI-detectable iron oxide nanoparticle (SPIO). This method may be extended to other proteins of interest to generate MRI-detectable molecular imaging probes.
FAQs
Survival depends on how a developing T cell interacts with major histocompatibility complex molecules and self-antigens. Cells that fail to recognize major histocompatibility complex molecules receive death signals, while cells that bind self-antigens too strongly are also eliminated. This filtering retains cells with useful recognition properties while reducing the risk of self-reactivity.
Pro-apoptotic BCL-2 family proteins help transmit selection-associated death signals to the mitochondria. Their activity promotes release of cytochrome c, which activates downstream caspases, the enzymes that execute the apoptotic program. Linking receptor-level selection decisions to mitochondrial and caspase pathways allows thymic selection to remove unsuitable thymocytes through a coordinated cellular mechanism.
The significance lies in which cells are removed, not merely in reducing cell number. Eliminating thymocytes that cannot recognize major histocompatibility complex molecules limits the production of ineffective T cells, whereas removing cells that bind self-antigens too strongly supports central tolerance. This selective outcome helps establish a circulating T-cell repertoire that is both functional and self-tolerant.
Studies can examine thymocyte apoptosis as part of broader investigations into immune development and thymic function. The process is especially informative when researchers ask whether pathogen-associated changes alter the thymus, whether abnormal cell elimination contributes to immunodeficiency, or whether disrupted selection could permit autoreactive T cells associated with autoimmune disease.
Changes in this process can indicate that thymic selection is not producing the expected balance between functional T cells and central tolerance. Investigating those changes may help connect developmental abnormalities with immunodeficiency or with the emergence of potentially autoreactive cells. The findings therefore provide context for understanding how the thymus shapes immune competence.
Infection research can use thymocyte apoptosis to examine pathogen-associated changes in thymic function and their possible consequences for immune development. Such work places infection within a broader framework that includes selection, central tolerance, and immune deficiency. It can also help clarify how disturbances in the thymus might influence the quality of T-cell populations entering circulation.