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Partitioning of Cortical and Deep Cytoskeleton Responses from Transient Magnetic Bead Twisting

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Abstract

We attempted to estimate in living adherent epithelial alveolar cells, the degree of structural and mechanical heterogeneity by considering two individualized cytoskeleton components, i.e., a submembranous “cortical” cytoskeleton and a “deep” cytoskeleton (CSK). F-actin structure characterizing each CSK component was visualized from spatial reconstructions at low and high density, respectively, especially in a 10-μm-cubic neighborhood including the bead. Specific mechanical properties (Young elastic and viscous modulus E and η) were revealed after partitioning the magnetic twisting cytometry response using a double viscoelastic “solid” model with asymmetric plastic relaxation. Results show that the cortical CSK response is a faster (τ 1≤ 0.7s), softer (E1: 63-109 Pa), moderately viscous (η1: 7-18 Pa s), slightly tensed, and easily damaged structure compared to the deep CSK structure which appears slower (τ2 ∼ \( \frac{1}{2} \) min), stiffer (E2: 95-204 Pa), highly viscous (η2: 760-1967 Pa s), more tensed, and fully elastic, while exhibiting a larger stress hardening behavior. Adding drug depolymerizing actin filaments decreased predominantly the deep CSK stiffness. By contrast, an agent altering cell–matrix interactions affected essentially the cortical CSK stiffness. We concluded that partitioning the CSK within cortical and deep structures is largely consistent with their respective functional activities. © 2003 Biomedical Engineering Society.

PAC2003: 8716Ka, 8716Ac, 8380Lz

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  1. Inserm UMR S 492, Physiopathologie et Thérapeutique Respiratoires, Institut Supérieur des Biosciences de Paris, Université Paris, 94010, Créteil, France

    Valérie M. Laurent, Redouane Fodil, Patrick Cañadas, Sophie Féréol, Bruno Louis, Emmanuelle Planus & Daniel Isabey

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Laurent, V.M., Fodil, R., Cañadas, P. et al. Partitioning of Cortical and Deep Cytoskeleton Responses from Transient Magnetic Bead Twisting. Annals of Biomedical Engineering 31, 1263–1278 (2003). https://doi.org/10.1114/1.1616932

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