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Related Concept Videos

Adaptability of Cytoskeletal Filaments01:12

Adaptability of Cytoskeletal Filaments

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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

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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.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
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Introduction to the Cytoskeleton01:33

Introduction to the Cytoskeleton

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Overview of the Cytoskeleton
The cytoskeleton is a network of protein filaments present within the cell, having three distinct filaments ̶   microfilaments, microtubules, and intermediate filaments. Each has characteristic features that distinguish them, including the dynamics of their assembly and disassembly, mechanical properties, polarity, and the type of molecular motors associated with them. Earlier, they were thought to be present only in eukaryotic cells; however, their...
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Studying the Cytoskeleton01:17

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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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Cell-matrix's Response to Mechanical Forces01:13

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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
Anchoring junctions mechanically attach a cell to the...
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Polarity of the Cytoskeleton01:18

Polarity of the Cytoskeleton

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The intrinsic polarity of cells can be primarily attributed to two factors- i) the asymmetric accumulation of mobile components such are regulatory molecules and subcellular components across the cell and ii) the orientation of polar cytoskeletal filaments that make up the cytoskeletal networks, specifically microfilaments, and microtubules arranged along the axis of polarity. Interactions between the cytoskeletal filaments are crucial for the establishment and maintenance of the polar nature...
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Related Experiment Video

Updated: Nov 25, 2025

Reconstituting and Characterizing Actin-Microtubule Composites with Tunable Motor-Driven Dynamics and Mechanics
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The Actin Cytoskeleton as an Active Adaptive Material.

Shiladitya Banerjee1,2, Margaret L Gardel3, Ulrich S Schwarz4

  • 1Department of Physics and Astronomy and Institute for the Physics of Living Systems, University College London, London WC1E 6BT, United Kingdom.

Annual Review of Condensed Matter Physics
|December 21, 2020
PubMed
Summary

Actin, a key protein, forms the dynamic cytoskeleton, enabling cells to adapt their structure and mechanics. This active material offers insights into physics-based biological control and inspires new metamaterials.

Keywords:
active mattercell mechanicsfeedback controlmetamaterialnonequilibrium physicssoft matter

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Area of Science:

  • Biophysics
  • Cell Biology
  • Materials Science

Background:

  • Actin is crucial for cellular structure and mechanics, enabling adaptation through energy consumption.
  • The actin cytoskeleton functions as an active material, operating out of equilibrium to drive dynamic processes.
  • Biological systems leverage actin for complex control mechanisms, surpassing synthetic soft matter capabilities.

Purpose of the Study:

  • To analyze the actin cytoskeleton from a physics perspective as an active adaptive material.
  • To highlight actin's capacity for adaptive construction of diverse network architectures.
  • To explore actin's dynamical feedback system properties and their biological implications.

Main Methods:

  • Physics-based analysis of the actin cytoskeleton.
  • Examination of actin's material properties and adaptive capabilities.
  • Review of actin's dynamical behaviors, including feedback system characteristics.

Main Results:

  • Actin networks exhibit adaptive construction of varied architectures on demand.
  • The actin cytoskeleton displays feedback system dynamics such as excitability, bistability, and oscillations.
  • Actin serves as a model for coupling physical structure with information flow in biological systems.

Conclusions:

  • The actin cytoskeleton is a sophisticated active adaptive material with properties superior to synthetic systems.
  • Actin's mechanics and dynamics provide a model for biology-inspired metamaterials.
  • Understanding actin's role in physics offers insights into cellular adaptation and information processing.