Model for Probing Membrane-Cortex Adhesion by Micropipette Aspiration and Fluctuation Spectroscopy |
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Authors: | Ricard Alert Jaume Casademunt Jan Brugués Pierre Sens |
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Institution: | 1Departament d’Estructura i Constituents de la Matèria, Universitat de Barcelona, Barcelona, Spain;2Max Planck Institute of Molecular Cell Biology and Genetics, Max Planck Institute for Physics of Complex Systems, Dresden, Germany;3Laboratoire Gulliver, Centre National de la Recherche Scientifique-ESPCI Paris Tech, UMR 7083, Paris, France |
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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. |
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