Actin Dynamics
Actin Dynamics - Related Videos
08:57
Aip1p Dynamics Are Altered by the R256H Mutation in Actin
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Cited by 1 •
2014
Disease-causing mutations in actin can alter cytoskeletal function. Cytoskeletal dynamics are quantified through imaging of fluorescently tagged proteins using total internal fluorescence microscopy. As an example, the cytoskeletal protein, Aip1p, has altered localization and movement in cells expressing the mutant actin isoform, R256H.
07:27
TIRF Microscopy to Visualize Actin and Microtubule Coupling Dynamics
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2025
This video describes TIRF, a total internal reflection microscopy-based technique to visualize actin and microtubule polymerization dynamics. The method allows the high-resolution imaging of actin and microtubule coupling dynamics in real-time, which is essential for understanding cellular crosstalks.
08:37
Study of the Actin Cytoskeleton in Live Endothelial Cells Expressing GFP-Actin
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Cited by 33 •
2011
Microscopic imaging of live endothelial cells expressing GFP-actin allows characterization of dynamic changes in cytoskeletal structures. Unlike techniques that use fixed specimens, this method provides a detailed assessment of temporal changes in the actin cytoskeleton in the same cells before, during, and after various physical, pharmacological, or inflammatory stimuli.
19:16
Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy (FSM)
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Cited by 8 •
2009
Selection, microinjection, and imaging of fluorescently-labeled F-actin via fluorescent speckle microscopy (FSM).
07:53
Actin Co-Sedimentation Assay; for the Analysis of Protein Binding to F-Actin
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Cited by 18 •
2008
Proteins bind to filamentous actin (F-actin) through distinct actin binding modules. In this video we demonstrate the procedure of actin co-sedimentation, which is an in vitro assay routinely used to analyze proteins or specific domains that bind F-actin.
FAQs
Nucleation initiates the formation of a new actin filament, while elongation extends it as additional actin monomers are added. These steps determine where filaments appear and how quickly they grow within a cell. Their regulation allows cells to produce localized structural changes, which is important when reshaping the cell or organizing actin-dependent internal structures.
Actin-binding proteins regulate several stages of filament remodeling, including nucleation, elongation, branching, severing, capping, and depolymerization. By controlling these activities, they determine filament length, arrangement, and turnover. Their coordinated action gives cellular signaling pathways a way to connect external or internal signals with changes in cell shape, movement, and organization.
These remodeling processes allow existing actin networks to be reorganized rather than simply expanded. Branching creates new filament arrangements, severing divides existing structures, capping regulates filament ends, and depolymerization removes actin from the network. Together, they adjust the architecture and turnover of the cytoskeleton so cells can respond to changing functional demands.
Cell migration and shape changes require actin networks to be assembled, disassembled, and reorganized at appropriate locations. Regulated filament growth can help establish new cellular extensions, while remodeling changes the structure behind them. Because actin dynamics is linked to signaling pathways and actin-binding proteins, cells can coordinate these structural changes with directed movement and broader morphological responses.
Actin dynamics contributes to cell migration, membrane trafficking, cytokinesis, and the organization of internal structures. During cytokinesis, regulated actin remodeling supports cell division, while membrane trafficking depends on cytoskeletal reorganization to manage cellular transport events. These roles make actin dynamics relevant to development, immune responses, and the maintenance of tissue organization.
Researchers examine how regulated actin assembly and remodeling organize specialized cellular structures. In muscle sarcomeres, actin contributes to the ordered architecture associated with muscle function. In neuronal growth cones, dynamic actin organization supports structural changes during neuronal development. Comparing these settings shows how a shared cytoskeletal system produces different outcomes in different cell types.