A numerical model suggests the interplay between nuclear plasticity and stiffness during a perfusion assay

JOURNAL OF THEORETICAL BIOLOGY

卷:435

Article

Deveraux, Solenne¹  Allena, Rachele²  Aubry, Denis¹ 

[1] Univ Paris Saclay, Cent Supelec, Lab MSSMat UMR CNRS 8579, F-92290 Chatenay Malabry, France

[2] Inst Biomecan Humaine Georges Charpak, LBM, Arts & Metiers ParisTech, 151 Bd Hop, F-75013 Paris, France

关键词: Nucleus;    Plasticity;    Finite element;    Viscoelasticity;    Viscoplasticity;   

DOI  :  10.1016/j.jtbi.2017.09.007

来源: Elsevier

【 摘 要 】

Cell deformability is a necessary condition for a cell to be able to migrate, an ability that is vital both for healthy and diseased organisms. The nucleus being the largest and stiffest organelle, it often is a barrier to cell migration. It is thus essential to characterize its mechanical behaviour. First, we numerically investigate the visco-elasto-plastic properties of the isolated nucleus during a compression test. This simulation highlights the impact of the mechanical behaviour of the nuclear lamina and the nucleoplasm on the overall plasticity. Second, a whole cell model is developed to simulate a perfusion experiment to study the possible interactions between the cytoplasm and the nucleus. We analyze and discuss the role of the lamina for a wild-type cell model, and a lamin-deficient one, in which the Young's modulus of the lamina is set to 1% of its nominal value. This simulation suggests an interplay between the cytoplasm and the nucleoplasm, especially in the lamin-deficient cell, showing the need of a stiffer nucleoplasm to maintain nuclear plasticity. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free