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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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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. 
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Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
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Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...
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Related Experiment Video

Updated: Feb 24, 2026

Simplified, High-throughput Analysis of Single-cell Contractility using Micropatterned Elastomers
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Optimal Contractile Forces for a Mesenchymal Engine.

Dennis E Discher1, Lawrence J Dooling1

  • 1Biophysical Engineering Labs, University of Pennsylvania, Philadelphia, PA 19104, USA.

Developmental Cell
|August 23, 2017
PubMed
Summary
This summary is machine-generated.

Cellular mechanisms driving epithelial development are unclear. Myosin II contractility in dermal mesenchyme creates surface bumps, triggering epithelial gene expression during development.

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Area of Science:

  • Developmental biology
  • Cell biology
  • Tissue morphogenesis

Background:

  • The process by which a smooth epithelium becomes topographically patterned during development is not well understood.
  • Investigating the molecular and cellular underpinnings of developmental patterning is crucial for understanding tissue formation.

Purpose of the Study:

  • To elucidate the cell and molecular mechanisms responsible for topographic patterning of a smooth epithelium during development.
  • To identify the role of dermal mesenchyme in initiating epithelial changes.

Main Methods:

  • Utilized advanced imaging techniques to observe dynamic cellular processes in developing tissues.
  • Employed genetic and biochemical approaches to investigate the function of myosin II contractility.
  • Analyzed gene expression patterns in the epithelium in response to mesenchymal changes.

Main Results:

  • Demonstrated that myosin II contractility in the dermal mesenchyme is a key driver of topographic patterning.
  • Showed that mesenchymal contractility induces the formation of surface bumps.
  • Confirmed that these mesenchymal-induced surface bumps trigger specific epithelial gene expression programs.

Conclusions:

  • Myosin II-mediated contractility in the dermal mesenchyme plays a critical role in initiating epithelial surface patterning during development.
  • This study reveals a novel mechanism linking mesenchymal dynamics to epithelial morphogenesis.
  • The findings provide a foundation for further research into developmental signaling pathways.