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A quantitative model for the caveolae under cell membrane stretch.

Meng Zhang1,2, Anqi Chen3

  • 1Precision Medicine Institute, The First Affiliated Hospital of Sun Yat-Sen University, Sun Yat-Sen University, Guangzhou, 510080, China. meng.zhang_china@outlook.com.

Biomechanics and Modeling in Mechanobiology
|July 1, 2020
PubMed
Summary
This summary is machine-generated.

This study presents a two-state model for caveolae, revealing two stable states (open and closed) regulating cell membrane stretch. This model explains membrane dynamics during stretching experiments.

Keywords:
Caveolae modelingCell membraneDynamic stretch

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Area of Science:

  • Cell biology
  • Biophysics
  • Membrane biophysics

Background:

  • Caveolae are flask-shaped invaginations of the plasma membrane involved in cellular processes.
  • Understanding caveolae's role in cell membrane mechanics is crucial for cell biology.

Purpose of the Study:

  • To develop a quantitative model of caveolae function in cell membrane stretch regulation.
  • To investigate the free energy landscape of caveolae and predict their stable states.

Main Methods:

  • Derivation of free energy compositions for a single caveola.
  • Application of the central limit theory to model multiple caveolae.
  • Hypothesizing transition rates for dynamic stretching experiments.

Main Results:

  • The model predicts two local minima in free energy, corresponding to completely open and closed caveolae states.
  • The model successfully generalizes single caveola behavior to large populations using statistical mechanics.
  • Simulations of constant-speed tether-pulling experiments reveal dynamic membrane stretching behavior.

Conclusions:

  • The proposed two-state model quantitatively illustrates caveolae's mechanism in regulating cell membrane stretch.
  • Caveolae exist in stable open and closed states, influenced by shape coefficients.
  • The model provides a framework for understanding membrane dynamics under mechanical stress.