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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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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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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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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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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Actin Filament Structures in Migrating Cells.

Jaakko Lehtimäki1, Markku Hakala1, Pekka Lappalainen2

  • 1Institute of Biotechnology, University of Helsinki, 56, 00014, Helsinki, Finland.

Handbook of Experimental Pharmacology
|July 30, 2016
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Summary
This summary is machine-generated.

Cell migration is vital for development and healing. Understanding actin filament dynamics in mesenchymal and amoeboid migration is key to addressing diseases like cancer.

Keywords:
Actin-binding proteinsBlebbingCell migrationFilopodiaInvadopodiaLamellipodiaMyosin IIPodosomeStress fibers

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Developmental Biology

Background:

  • Cell migration is essential for multicellular organism development, wound healing, and immune responses.
  • Dysfunctional cell migration contributes to diseases, including cancer metastasis and immunological disorders.
  • Actin filament structures drive cell migration, with variations based on cell type and environment.

Purpose of the Study:

  • To introduce key actin filament structures involved in mesenchymal and amoeboid cell migration.
  • To discuss the regulatory mechanisms of actin assembly and turnover by actin-binding proteins.

Main Methods:

  • Review of established literature on cell migration mechanisms.
  • Analysis of actin filament dynamics in different cell migration modes.
  • Discussion of the roles of actin-binding proteins in cytoskeletal regulation.

Main Results:

  • Identification of distinct actin structures critical for mesenchymal and amoeboid migration.
  • Elucidation of how actin-binding proteins control the assembly and disassembly of these structures.
  • Highlighting the context-dependent nature of actin dynamics in cell motility.

Conclusions:

  • The diverse actin filament structures and their regulation by actin-binding proteins are fundamental to cell migration.
  • Understanding these mechanisms provides insights into normal physiological processes and disease pathogenesis.
  • Further research into actin dynamics can inform therapeutic strategies for migration-related diseases.