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Actin-ring segment switching drives nonadhesive gap closure.

Qiong Wei1, Xuechen Shi2, Tiankai Zhao1

  • 1Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802.

Proceedings of the National Academy of Sciences of the United States of America
|December 15, 2020
PubMed
Summary
This summary is machine-generated.

This study reveals how cells cooperatively close nonadhesive gaps using collective migration, actin-network fusion, and purse-string contraction, a fundamental process in tissue repair and development.

Keywords:
actin ringcell patterninggap closuretraction force microscopy

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Area of Science:

  • Cell Biology
  • Biophysics
  • Developmental Biology

Background:

  • Gap closure is essential for tissue integrity during development and repair.
  • Understanding nonadhesive gap closure mechanisms is crucial for regenerative medicine.

Purpose of the Study:

  • To elucidate the cellular and molecular mechanisms underlying nonadhesive gap closure.
  • To develop a kinetic model for quantifying gap-closure dynamics.

Main Methods:

  • Demonstration of a nonadhesive gap closure model.
  • Observation of collective cell migration, actin-network fusion, and purse-string contraction.
  • Application of cellular force microscopy and kinetic modeling.

Main Results:

  • Identified a novel mechanism involving actin-ring segment switching at high-curvature edges.
  • Observed size-dependent gap closure driven by actin-cable segment switching.
  • Quantified successful actin-cable segment switching via inward traction force measurements.

Conclusions:

  • Cells employ multifaceted, cooperative strategies to close nonadhesive gaps.
  • Actin-ring dynamics and purse-string contraction are key regulators of gap closure.
  • The findings provide insights into tissue repair and developmental processes.