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Related Experiment Video

Updated: Jul 17, 2025

Ligand Nano-cluster Arrays in a Supported Lipid Bilayer

Ligand Nano-cluster Arrays in a Supported Lipid Bilayer

Published on: April 23, 2017

Clustering of lipids driven by integrin.

Tapas Singha^1,2, Anirban Polley^3,4, Mustansir Barma⁵

¹Institut Curie, Université PSL, Sorbonne Université, CNRS UMR168, Laboratoire Physico Chimie Curie, 75005 Paris, France.

|September 1, 2023

Summary

Integrin proteins remodel cell membranes and actin networks. This study models how integrins drive lipid clustering via mechanochemical pathways, revealing insights into cell membrane dynamics and endocytosis.

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Area of Science:

Cell biology
Biophysics
Mechanobiology

Background:

Integrins are transmembrane receptors crucial for cell adhesion and mechanotransduction.
Integrin activity influences membrane dynamics and facilitates lipid and protein clustering.
Lipid clustering is essential for specific endocytosis pathways.

Purpose of the Study:

To develop a minimal, exactly solvable model of integrin-mediated lipid clustering.
To investigate the interplay between integrin stochasticity and membrane dynamics.
To provide an analytic description of membrane deformation and lipid clustering driven by single integrins.

Main Methods:

A two-step mechanism modeling integrin-induced actin rearrangement and subsequent lipid clustering.
Stochastic modeling of integrin on/off states and membrane dynamics.
Derivation of analytic expressions for membrane deformation and local velocity.

Main Results:

An analytic expression for membrane deformation and local velocity mediated by a single integrin.
Non-monotonic evolution of membrane deformation dependent on stochastic shuttling timescales and membrane properties.
Estimates indicating strong lipid clustering within the deformed membrane region.

Conclusions:

The model elucidates the mechanochemical pathways by which integrins drive lipid clustering.
Integrin dynamics and membrane properties significantly influence lipid clustering efficiency.
The findings offer quantitative insights into integrin function in membrane organization and endocytosis.