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Related Concept Videos

Role of Myosin in Cell Migration01:18

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Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
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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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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
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Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
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Related Experiment Video

Updated: Jan 17, 2026

Myosin-Specific Adaptations of In vitro Fluorescence Microscopy-Based Motility Assays
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Active gel theory for cell migration with two myosin isoforms.

Nils O Winkler1, Oliver M Drozdowski1,2, Falko Ziebert1

  • 1Institute for Theoretical Physics and Bioquant, Heidelberg University, 69120 Heidelberg, Germany.

Physical Review. E
|September 16, 2025
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Summary

Myosin II isoforms A and B play complementary roles in cell migration, with isoform A at the front and B at the rear. This active gel model explains their distinct functions in cell motility.

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Area of Science:

  • Cell biology
  • Biophysics
  • Theoretical biology

Background:

  • Myosin II molecular motors are crucial for cell motility and force generation.
  • Nonmuscle cells possess three Myosin II isoforms with distinct properties and abundances.
  • The specific biological and physical roles of these isoforms are not fully understood.

Purpose of the Study:

  • To elucidate the complementary roles of Myosin II isoforms A and B in cell migration using active gel theory.
  • To model the behavior of Myosin II isoforms within the context of cell motility.

Main Methods:

  • Active gel theory was employed to model Myosin II isoform behavior.
  • The model was derived from coarse-graining kinetic equations and nonequilibrium thermodynamics.
  • Model parameters were adjusted to simulate motile cell solutions and explore parameter space.

Main Results:

  • The model predicts that Myosin II isoform A localizes to the cell front and isoform B to the rear, consistent with experimental observations.
  • Beyond typical parameters, the model predicts cell oscillations in length and velocity.
  • An analytical solution for the stiff limit was derived, enabling state diagram calculations.

Conclusions:

  • Isoform-specific molecular details are essential for accurately describing whole-cell behavior, particularly cell migration.
  • The study provides a theoretical framework for understanding the distinct contributions of Myosin II isoforms.
  • Predicted oscillations may be achievable in engineered biological systems.