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Related Concept Videos

The Role of Actin and Myosin in Non-muscle Cells01:10

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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution.  Actin coding genes are conserved within species and across...
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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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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.
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Related Experiment Video

Updated: Apr 15, 2026

Computational Analysis of the Caenorhabditis elegans Germline to Study the Distribution of Nuclei, Proteins, and the Cytoskeleton
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F-actin distribution and function during sexual development in Eimeria maxima.

Sonja Frölich1, Michael Wallach1

  • 1The iThree Institute, School of Medical and Molecular Biosciences,University of Technology Sydney,PO Box 123,Broadway,Sydney,New South Wales 2007,Australia.

Parasitology
|March 25, 2015
PubMed
Summary

The actin cytoskeleton is crucial for macrogametocyte development and oocyst wall formation in Eimeria maxima. Actin microfilaments transport key components, ensuring proper oocyst wall assembly.

Keywords:
Eimeria oocyst3D confocal microscopyWFB1 vesicle transportactincytoskeletal inhibitors

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Area of Science:

  • Cell Biology
  • Parasitology
  • Molecular Biology

Background:

  • The sexual development of Eimeria maxima involves complex processes like macrogametocyte growth and oocyst wall formation.
  • The role of the actin cytoskeleton in these processes has not been fully elucidated.

Purpose of the Study:

  • To investigate the involvement of the actin cytoskeleton in macrogametocyte growth and oocyst wall formation in Eimeria maxima.
  • To understand the transport mechanisms of type 1 wall-forming bodies (WFBs) during oocyst development.

Main Methods:

  • Purified Eimeria maxima macrogametocytes and oocysts were stained for F-actin and type 1 WFBs.
  • Three-dimensional confocal microscopy was used for analysis at various developmental stages.
  • In vitro treatment with actin depolymerizing agents (Cytochalasin D, Latrunculin) was performed.

Main Results:

  • F-actin formed a meshwork in macrogametocytes, linking type 1 WFBs.
  • F-actin microfilaments contacted WFB1s during early oocyst wall formation.
  • Actin depolymerization reduced WFB1 numbers, impairing oocyst wall formation.

Conclusions:

  • The actin cytoskeleton plays a vital role in transporting type 1 WFBs.
  • Actin is essential for the structural integrity and formation of the Eimeria maxima oocyst wall.