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Title of Journal: Eur Biophys J

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Abbravation: European Biophysics Journal

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Springer-Verlag

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DOI

10.1016/0020-0190(79)90101-7

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1432-1017

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Deformation of intracellular endosomes under a mag

Authors: C Wilhelm A Cebers JC Bacri F Gazeau
Publish Date: 2003/06/26
Volume: 32, Issue: 7, Pages: 655-660
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Abstract

We present a noninvasive method to monitor the membrane tension of intracellular organelles using a magnetic field as an external control parameter By exploiting the spontaneous endocytosis of anionic colloidal ferromagnetic nanoparticles we obtain endosomes possessing a superparamagnetic lumen in eukaryotic cells Initially flaccid the endosomal membrane undulates because of thermal fluctuations restricted in zero field by the resting tension and the curvature energy of the membrane When submitted to a uniform magnetic field the magnetized endosomes elongate along the field resulting in the flattening of the entropic membrane undulations The quantification of the endosome deformation for different magnetic fields allows in situ measurement of the resting tension and the bending stiffness of the membrane enclosing the intracellular organelle

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