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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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Related Experiment Video

Updated: Nov 17, 2025

Sarcomere Shortening of Pluripotent Stem Cell-Derived Cardiomyocytes using Fluorescent-Tagged Sarcomere Proteins.
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Myofibrillar Structural Variability Underlies Contractile Function in Stem Cell-Derived Cardiomyocytes.

Kathryn Ufford1, Sabrina Friedline1, Zhaowen Tong2

  • 1Division of Cardiovascular Medicine, University of Michigan, Ann Arbor, MI, USA.

Stem Cell Reports
|February 12, 2021
PubMed
Summary
This summary is machine-generated.

Myofibrillar structure in induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) significantly impacts their contractile function. Assessing myofibrillar abundance improves accuracy in disease modeling and drug testing with iPSC-CMs.

Keywords:
cardiomyocytecontractile functioncontractilityiPSC-CMiPSC-cardiomyocytemicropatternedtraction force

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Area of Science:

  • Cardiovascular Biology
  • Stem Cell Biology
  • Biomedical Engineering

Background:

  • Accurate assessment of cardiomyocyte contractile function is crucial for disease modeling and pharmaceutical testing.
  • Induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) are a valuable tool, but their intrinsic variability poses challenges.
  • Micropatterning techniques improve iPSC-CM alignment and enable contractile studies, yet variability determinants remain unclear.

Purpose of the Study:

  • To investigate the impact of myofibrillar structure on contractile function in iPSC-CMs.
  • To identify key factors contributing to variability in iPSC-CM contractile performance.
  • To enhance the reliability of iPSC-CMs for drug screening and disease modeling.

Main Methods:

  • Automated analysis of micropatterned iPSC-CMs using F-actin staining.
  • Quantification of myofibrillar abundance and its correlation with contractile function.
  • Assessment of variability independent of subcloning and purification methods.

Main Results:

  • Myofibrillar abundance in iPSC-CMs is highly variable and strongly correlates with contractile function.
  • This variability persists despite subcloning from single induced pluripotent stem cells.
  • Variability is independent of common iPSC-CM purification strategies.

Conclusions:

  • Myofibrillar structure is a critical determinant of contractile function in iPSC-CMs.
  • Concurrent assessment of myofibrillar structure is essential for accurate disease modeling and pharmaceutical testing.
  • Controlling for myofibrillar structure enhances sensitivity and reduces false positives in iPSC-CM studies.