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Model for probing membrane-cortex adhesion by micropipette aspiration and fluctuation spectroscopy.

ABSTRACT: We propose a model for membrane-cortex adhesion that couples membrane deformations, hydrodynamics, and kinetics of membrane-cortex ligands. In its simplest form, the model gives explicit predictions for the critical pressure for membrane detachment and for the value of adhesion energy. We show that these quantities exhibit a significant dependence on the active acto-myosin stresses. The model provides a simple framework to access quantitative information on cortical activity by means of micropipette experiments. We also extend the model to incorporate fluctuations and show that detailed information on the stability of membrane-cortex coupling can be obtained by a combination of micropipette aspiration and fluctuation spectroscopy measurements.

SUBMITTER: Alert R 

PROVIDER: S-EPMC4407260 | biostudies-other | 2015 Apr

REPOSITORIES: biostudies-other

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Model for probing membrane-cortex adhesion by micropipette aspiration and fluctuation spectroscopy.

Alert Ricard R   Casademunt Jaume J   Brugués Jan J   Sens Pierre P  

Biophysical journal 20150401 8

We propose a model for membrane-cortex adhesion that couples membrane deformations, hydrodynamics, and kinetics of membrane-cortex ligands. In its simplest form, the model gives explicit predictions for the critical pressure for membrane detachment and for the value of adhesion energy. We show that these quantities exhibit a significant dependence on the active acto-myosin stresses. The model provides a simple framework to access quantitative information on cortical activity by means of micropip  ...[more]