Protrusion Formation
Protrusion Formation - Related Videos
01:28
Types of Membrane Protrusions
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2023
The protrusion of the cell surface is an initial step for several cellular processes, including cell migration, phagocytosis, and neurite outgrowth. These membrane protrusions are a result of cytoskeletal rearrangement. The most widely observed cell protrusions include lamellipodia, pseudopodia, filopodia, microvilli, invadopodia, and podosomes. These protrusions can be of two types — static or dynamic. The microvilli, an example of stable protrusions, are finger-like projections with a...
06:37
Protrusion Force Microscopy: A Method to Quantify Forces Developed by Cell Protrusions
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Cited by 5 •
2018
Here, we detail the experimental techniques used to evaluate the protrusion forces that podosomes apply on a compliant film, from the preparation of the film to the automated analysis of topographical images.
08:12
A Graphical User Interface for Software-assisted Tracking of Protein Concentration in Dynamic Cellular Protrusions
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2017
We present a software solution for semi-automated tracking of relative protein concentration along the length of dynamic cellular protrusions.
06:58
Quantification of Membrane Ruffle Formation Using Scanning Electron Microscopy
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2025
This video demonstrates sample preparation, fixation, and imaging of a macrophage cell that displays membrane ruffles using scanning electron microscopy, SEM. Detailed information about membrane morphology and organization is crucial for understanding the physiological condition of the cells.
02:16
Solution Formation
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2020
There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride. This selective solubility...
FAQs
Protrusion formation begins when signaling pathways activate actin-nucleating factors near the plasma membrane. These factors organize the assembly of new actin filaments at the cell edge, creating the structural force needed for outward extension. The timing and location of this activation help determine where a cell changes shape or begins interacting with its surroundings.
Branched and bundled actin filament arrangements support distinct protrusive structures. Branched networks contribute to lamellipodia, whereas bundled filaments support filopodia. This structural difference gives cells more than one way to extend their edges, allowing protrusions to contribute to changes in shape, movement, or contact with neighboring cells.
Actin polymerization can push the membrane outward, but adhesion and myosin-generated forces help determine whether the extension remains stable or retracts. Adhesion supports attachment to the surrounding environment, while myosin contributes force within the cytoskeleton. Their combined effects regulate the persistence and remodeling of a protrusion rather than simply initiating its formation.
Researchers can analyze where protrusions appear, how they extend, and whether they stabilize or retract to investigate cellular movement. These observations connect edge activity with changes in cell position and shape. The approach is useful for examining migration during development, wound repair, and immune responses, where coordinated movement is biologically important.
Controlled protrusion formation supports several processes that require cells to move or reorganize their contacts. During development, it contributes to directed cellular positioning; during wound repair, it helps cells move into damaged regions; and during immune responses, it supports movement and interactions with neighboring cells. These contexts make protrusion behavior relevant to normal tissue biology.
Abnormal protrusion formation can provide insight into how cells acquire altered movement behaviors associated with tumor invasion. By examining actin-driven extensions together with their stabilization or retraction, researchers can investigate mechanisms underlying abnormal cellular movement. This connects a basic cell-biological process with disease-focused studies of how tumor cells interact with and move through surrounding environments.