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Related Concept Videos

Studying the Cytoskeleton01:17

Studying the Cytoskeleton

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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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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...
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Generation of Straight or Branched Actin Filaments01:14

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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...
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Adaptability of Cytoskeletal Filaments01:12

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The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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Actin Filament Depolymerization01:19

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Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Actin filament dynamics using microfluidics.

Marie-France Carlier1, Guillaume Romet-Lemonne1, Antoine Jégou1

  • 1Laboratoire d'Enzymologie et Biochimie Structurales, CNRS, Gif-sur-Yvette, France.

Methods in Enzymology
|March 18, 2014
PubMed
Summary

Microfluidics combined with microscopy enables quantitative analysis of actin dynamics and protein mechanosensitivity. This approach extends to studying other cytoskeletal polymers and molecular motor transport under flow.

Keywords:
Actin networksActin regulatory proteinsForce measurementsMicrofluidicsSingle actin filament assembly dynamicsSurface passivation and functionalizationTIRF microscopy

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Standard single-filament microscopy has limitations in analyzing complex cellular processes.
  • Understanding actin assembly dynamics and protein interactions is crucial for cell function.

Purpose of the Study:

  • To present a combined microfluidics and microscopy approach for enhanced quantitative analysis of cytoskeletal dynamics.
  • To explore kinetics of actin self-assembly and regulator interactions.
  • To assess mechanosensitivity of protein machineries.

Main Methods:

  • Integration of microfluidics with TIRF (total internal reflection fluorescence) and epifluorescence microscopy.
  • Calibration of viscous drag force from fluid flow to measure filament mechanosensitivity.
  • Application to actin filaments, microtubules, and other cytoskeletal polymers.

Main Results:

  • Facilitates quantitative analysis of actin assembly dynamics and regulation.
  • Enables study of kinetics of actin self-assembly and regulator interactions.
  • Allows assessment of mechanosensitivity of protein machineries like formins.

Conclusions:

  • The combined microfluidics-microscopy technique significantly advances the study of cytoskeletal polymer dynamics.
  • This method provides insights into protein mechanosensitivity and coordination between filament populations.
  • The approach is versatile and applicable to various cytoskeletal components and motor transport studies.