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Updated: Jan 22, 2026

Dissecting Mechanoenzymatic Properties of Processive Myosins with Ultrafast Force-Clamp Spectroscopy
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Myosin IIA-mediated forces regulate multicellular integrity during vascular sprouting.

Christine Yoon1, Colin Choi1, Sarah Stapleton1

  • 1Biological Design Center, Department of Biomedical Engineering, Boston University, Boston, MA 02215.

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|July 19, 2019
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Cellular contractility, driven by NMIIA, is crucial for maintaining cell-cell connections during angiogenic sprouting. This mechanical force ensures multicellularity and proper cell adhesion in forming blood vessels.

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Area of Science:

  • Vascular biology
  • Cellular mechanics
  • Biomaterials science

Background:

  • Angiogenic sprouting forms new blood vessels, essential for tissue repair and development.
  • Tip and stalk cells migrate collectively, maintaining cell-cell junctions during this process.
  • The role of mechanical forces in regulating angiogenic sprouting remains largely undefined.

Purpose of the Study:

  • To investigate the role of cellular contractility in regulating sprout morphogenesis during angiogenesis.
  • To elucidate the mechanobiological mechanisms underlying collective cell migration in vascular network formation.

Main Methods:

  • Utilized a biomimetic model of angiogenesis to study sprout behavior.
  • Generated 3D maps of mechanical deformations to analyze force generation by sprout cells.
  • Inhibited cellular contractility using blebbistatin and employed CRISPR/Cas9 gene editing to identify key molecular players.

Main Results:

  • Leader cells, not stalk cells, were identified as the primary source of contractile forces.
  • Inhibition of contractility did not impede cell invasion but caused dissociation between tip and stalk cells.
  • NMIIA was identified as the key isoform regulating multicellularity and contractility during sprouting, impacting adherens-junction organization.

Conclusions:

  • Cellular contractility, particularly NMIIA-mediated forces, is critical for maintaining multicellularity during angiogenic sprouting.
  • Mechanical forces play a central role in regulating cell-cell adhesions and collective motility in vascular development.