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Related Concept Videos

Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
Mechanisms of Membrane Domain Formation00:59

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Cell Motility through Blebbing01:16

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Related Experiment Video

Updated: May 31, 2026

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
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Dynamical membrane curvature instability controlled by intermonolayer friction.

Anne-Florence Bitbol1, Jean-Baptiste Fournier, Miglena I Angelova

  • 1Laboratoire Matière et Systèmes Complexes (MSC), Université Paris Diderot, Paris 7 and UMR CNRS 7057, Paris, France.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 29, 2011
PubMed
Summary

Chemical modification of phospholipid membranes causes dynamic shape changes in vesicles. This study quanties these changes, revealing insights into membrane dynamics and inter-monolayer friction.

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Last Updated: May 31, 2026

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
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Area of Science:

  • Biophysics
  • Materials Science
  • Physical Chemistry

Background:

  • Phospholipid membranes exhibit complex mechanical properties influencing cellular functions.
  • Understanding membrane dynamics is crucial for drug delivery and biomaterial design.
  • Local chemical modifications can induce significant membrane deformations.

Purpose of the Study:

  • To investigate the dynamical curvature instability in phospholipid membranes induced by local chemical modification.
  • To develop a theoretical model describing vesicle deformation dynamics.
  • To differentiate the effects of altered lipid density and spontaneous curvature on membrane behavior.

Main Methods:

  • Microinjection of a basic solution to induce local chemical modification of a giant unilamellar vesicle (GUV).
  • Theoretical modeling incorporating changes in equilibrium lipid density and spontaneous membrane curvature.
  • Analysis of vesicle deformation relaxation dynamics and comparison with experimental data.

Main Results:

  • Local chemical modification induces vesicle deformation that subsequently relaxes.
  • Theoretical model successfully captures the distinct dynamics arising from changes in lipid density and spontaneous curvature.
  • Inter-monolayer friction significantly influences relaxation timescales, particularly with altered lipid density.

Conclusions:

  • The study provides a robust theoretical framework for understanding chemically induced membrane instabilities.
  • Experimental results show excellent agreement with theoretical predictions.
  • The research successfully estimates the inter-monolayer friction coefficient, validating the model and offering insights into membrane mechanics.