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Mechanism of Filopodia Formation

Mechanism of Filopodia Formation

Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...

Assembly of Cytoskeletal Filaments

Assembly of Cytoskeletal Filaments

Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...

Formation of Intermediate Filaments

Formation of Intermediate Filaments

Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been reported.

Formation of Higher-order Actin Filaments

Formation of Higher-order Actin Filaments

The polymerization of G-actin monomers into filamentous F-actin is a multi-step process. Once the F-actins are formed, they can bundle together in different arrangements to form higher-order networks and regulate cellular functions. Common examples include the formation of lamellipodia and filopodia at the cell's leading edge by actin reorganization in a migrating cell. The microvilli on the brush border epithelial cells are also formed through the F-actin network.
The high-order actin networks...

Generation of Straight or Branched Actin Filaments

Generation of Straight or Branched Actin Filaments

The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...

Mechanism of Lamellipodia Formation

Mechanism of Lamellipodia Formation

Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...

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Related Experiment Video

Updated: Jun 3, 2026

Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles

Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles

Published on: May 5, 2022

Optically directed assembly of continuous mesoscale filaments.

J T Bahns¹, S K R S Sankaranarayanan, S K Gray

¹Biosciences Division, Argonne National Laboratory, Illinois 60439, USA.

Physical Review Letters

|March 17, 2011

Summary

Researchers created stable, continuous filaments from carbon and gold nanoparticles using a laser. This optically directed assembly method allows for controlled synthesis of mesoscale filaments with arbitrary shapes and sizes.

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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles

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Tuning the Contractility and Deformation Modes of Active Actin-Based Assemblies In Vitro: From Two-Dimensional Active Networks to Liquid Crystal Drops

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ECM Protein Nanofibers and Nanostructures Engineered Using Surface-initiated Assembly

ECM Protein Nanofibers and Nanostructures Engineered Using Surface-initiated Assembly

Published on: April 17, 2014

Area of Science:

Materials Science
Nanotechnology
Chemical Engineering

Background:

Colloidal droplets are complex systems with dynamic interfaces.
Nanoparticle self-assembly is crucial for advanced material fabrication.
Controlling assembly at the mesoscale remains a significant challenge.

Purpose of the Study:

To demonstrate a novel method for continuous filament formation.
To achieve controlled colloidal synthesis of mesoscale filaments.
To investigate the mechanisms behind optically directed assembly.

Main Methods:

Utilizing a weak laser focus near the edge of an evaporating colloidal droplet.
Employing optical trapping, hydrothermal, and chemical interactions.
Analyzing assembly mechanisms with fluid dynamics, molecular dynamics, and lattice kinetic Monte Carlo simulations.

Main Results:

Achieved irreversible continuous filament formation.
Demonstrated controlled synthesis of stable, irreversible mesoscale filaments.
Filaments exhibit arbitrary shapes and sizes.

Conclusions:

Optically directed assembly offers a precise method for fabricating mesoscale colloidal structures.
The study elucidates the interplay of optical, fluidic, and chemical forces in directed assembly.
This technique holds potential for creating novel nanomaterials with tailored properties.