POLIZZI, Stefano; LAPERROUSAZ, Bastien; PEREZ-RECHE, Francisco; NICOLINI, Franck; SATTA, Véronique Maguer; ARNÉODO, Alain; ARGOUL, Françoise

doi:10.1088/1367-2630/aac3c7

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POLIZZI, Stefano
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

LAPERROUSAZ, Bastien
Laboratoire de Physique de l'ENS Lyon [Phys-ENS]
Laboratoire de Biologie à Grande Échelle [BGE - UMR S1038]
Centre de Recherche en Cancérologie de Lyon [UNICANCER/CRCL]
Centre Hospitalier Lyon Sud [CHU - HCL] [CHLS]

PEREZ-RECHE, Francisco
Institute for Complex Systems and Mathematical Biology [Aberdeen] [ICSMB]

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New Journal of Physics. 2018, vol. 20, n° 5, p. 053057

Institute of Physics: Open Access Journals

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Under physiological and pathological conditions, cells experience large forces and deformations that often exceed the linear viscoelastic regime. Here we drive CD34+ cells isolated from healthy and leukemic bone marrows in the highly nonlinear elasto-plastic regime, by poking their perinuclear region with a sharp AFM cantilever tip. We use the wavelet transform mathematical microscope to identify singular events in the force-indentation curves induced by local rupture events in the cytoskeleton (CSK). We distinguish two types of rupture events, brittle failures likely corresponding to irreversible ruptures in a stiff and highly cross-linked CSK and ductile failures resulting from dynamic cross-linker unbindings during plastic deformation without loss of CSK integrity. We propose a stochastic multiplicative cascade model of mechanical ruptures that reproduces quantitatively the experimental distributions of the energy released during these events, and provides some mathematical and mechanistic understanding of the robustness of the log-normal statistics observed in both brittle and ductile situations. We also show that brittle failures are relatively more prominent in leukemia than in healthy cells suggesting their greater fragility.< Réduire

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A minimal rupture cascade model for living cell plasticity

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