Phalloidin
Phalloidin - Related Videos
04:15
Fluorescence Localization of Tight Junction Proteins and Stress Fibers in Endothelial Cells
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2025
Source: Alluri, H., et al. Oxygen-Glucose Deprivation and Reoxygenation as an In Vitro Ischemia-Reperfusion Injury Model for Studying Blood-Brain Barrier Dysfunction. J. Vis. Exp. (2015).The video demonstrates the fluorescent localization of tight junction proteins and stress fibers in rat brain microvascular endothelial cells (RBMECs). In the stressed monolayer, fluorescently labeled antibodies are used to tag the tight junction proteins, while fluorophore-tagged phalloidin labels the stress...
03:13
Immunostaining to Visualize Viral Antigen and Host Protein Colocalization in the Insect Gut
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2026
Source: Zhang, L., et al. Immunofluorescent Labeling of Plant Virus and Insect Vector Proteins in Hemipteran Guts. J. Vis. Exp. (2021)The video demonstrates the preparation of gut tissue from a plant virus–infected insect vector for fluorescence imaging. Fixed guts were washed, permeabilized, and incubated with two fluorescent antibodies in a blocking solution—one targeting a viral antigen in vesicles, the other a vesicle-associated membrane protein. The tissue was counterstained for actin...
03:44
A Double-Labeling Immunofluorescence Technique to Visualize Host and Pathogen Proteins in an Infected Cell
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2025
This video showcases double-labeling immunostaining with two different primary antibodies raised in the same species, binding specifically to parasite and host proteins. Furthermore, labeled secondary antibodies targeting these primary antibodies allow the distinct visualization of host and parasite proteins, facilitating the study of host-pathogen interaction.
04:21
Flow Cytometry Analysis of Intracellular and Emergent Extracellular Listeria monocytogenes In Vitro
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2025
In this video, we quantify intracellular and extracellular Listeria monocytogenes, an intracellular pathogenic bacteria, following their infection of cultured macrophages in vitro using flow cytometry.
03:25
Cytoskeleton and Focal Adhesion Organization Assay: An Immunofluorescence-based Method to Study Cell Adhesion and Spreading on Substrates
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2023
This video describes the technique of studying the cytoskeleton and focal adhesions in primary human colon cancer cells to understand its variations depending on substrate rigidity. This culture of cancer cells on soft and hard substrates allows various downstream biophysical measurements for cancer prognosis.
FAQs
Binding to filamentous actin both marks the filaments and stabilizes them, allowing their organization to be examined after cells or tissues are fixed. This is important because the observed pattern reflects the distribution of F-actin preserved during staining. Researchers can therefore assess changes in filament arrangement associated with cell shape, migration, phagocytosis, or infection-related remodeling.
A fluorescent label converts phalloidin’s selective association with F-actin into a visible microscopy signal. The resulting fluorescence shows where actin filaments are organized within a fixed cell or tissue, making structural features easier to compare among experimental conditions. This approach is particularly useful when cytoskeletal changes must be related to immune-cell behavior or pathogen-associated disruption.
Differences in filament organization can indicate changes in cell shape, migration, and phagocytosis, all of which depend on regulated cytoskeletal behavior. In immunology, these patterns help connect actin architecture with immune-cell function. Rather than providing only a structural image, the staining can show how cellular organization changes during functional responses or disease-related processes.
Combining phalloidin with antibody-based markers helps separate host-cell actin structures from microbial components. The actin signal identifies the organization of the host cytoskeleton, while antibody markers provide additional identity information for other cellular or pathogen-associated structures. This combined analysis supports interpretation of cellular invasion and helps locate pathogen-associated changes relative to host architecture.
The method uses fixed cells or tissues, a fluorescently labeled phalloidin probe, and fluorescence microscopy. After the fixed specimen is stained with the probe, filamentous actin can be detected through its associated fluorescence. Researchers then examine the resulting pattern to compare cytoskeletal organization across samples or relate it to additional antibody-based markers.
It is especially useful when researchers need to connect actin organization with immune-cell functions such as migration or phagocytosis. Imaging reveals whether these functions are accompanied by changes in cell shape or filament arrangement. This provides structural context for interpreting immune responses and for comparing how different conditions affect host-cell cytoskeletal behavior.
In infection studies, phalloidin staining makes host-cell actin remodeling visible alongside pathogen-associated structures or markers. Researchers can examine altered cell shape, filament organization, and relationships between host architecture and microbial components. These observations help investigate cellular invasion and connect cytoskeletal disruption with broader disease mechanisms without treating the actin signal as a direct microbial marker.