Apoptotic Foci
Apoptotic Foci - Related Videos
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Quantitation of γH2AX Foci in Tissue Samples
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Quantitation of DNA double-strand breaks on the basis of γH2AX foci has become an invaluable tool, particularly in radiation biology, for the evaluation of tissue radiosensitivity and effects of radiation modifying compounds. Here we demonstrate the use of an immunofluorescence assay for quantitation of γH2AX foci in tissue samples.
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Quantification of γH2AX Foci in Response to Ionising Radiation
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Analysis of Efferocytosis of Apoptotic Thymocytes by Peritoneal Macrophages
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09:33
Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules
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Stress Granules (SGs) are nonmembranous cytoplasmic structures that form in cells exposed to a variety of stresses. SGs contain mRNAs, RNA-binding proteins, small ribosomal subunits, translation-related factors, and various cell signaling proteins. This protocol describes a workflow that uses several experimental approaches to detect, characterize, and quantify bona fide SGs.
FAQs
Apoptotic foci develop when apoptotic signaling activates initiator and executioner caspases in particular cells or tissue regions. These enzymes are associated with the cellular changes that make apoptosis detectable, including shrinkage, chromatin condensation, DNA fragmentation, and production of membrane-bound apoptotic bodies. The resulting concentration of affected cells creates a spatially organized signal that can be examined microscopically.
Several coordinated changes contribute to detection rather than a single event. Cell shrinkage alters cellular appearance, chromatin condensation changes nuclear structure, and DNA fragmentation provides molecular evidence of cellular dismantling. Membrane-bound apoptotic bodies add discrete structures that may be visible as localized signals. Together, these features help connect a microscopic focus with the underlying progression of programmed cell death.
Distribution shows where cell loss occurs within a complex biological system, while abundance indicates how much apoptosis is present. Their spatial pattern can therefore reveal localized responses rather than only a sample-wide average. Examining both properties helps researchers determine when and where apoptosis occurs, supporting studies of development, disease progression, tissue remodeling, and responses to treatment.
Researchers can examine apoptotic foci through fluorescence microscopy, tissue staining, or molecular markers. These approaches provide complementary ways to detect the cellular or molecular features associated with apoptosis in biological samples. After detection, investigators can map the locations of signals and quantify their abundance, allowing comparisons among regions, experimental conditions, or treatment responses without relying solely on visual inspection.
A basic workflow begins with a biological sample in which apoptosis is being investigated, followed by selection of an appropriate detection approach, such as fluorescence microscopy, tissue staining, or molecular markers. Researchers then identify the regions containing apoptotic signals, record their distribution, and quantify their abundance. This workflow connects visual or molecular evidence with spatial patterns of cell loss.
Apoptotic foci are useful when researchers need to relate cell loss to biological location or condition. In developmental studies, they can help examine programmed cell removal; in disease research, they can reveal regions associated with progression; and in tissue remodeling, they can show where cellular turnover occurs. They also support evaluation of treatment responses by indicating the distribution and amount of apoptosis.