title: Nonlinear mechanical modeling of cell adhesion.
abstract: Cell adhesion, which is mediated by the receptor-ligand bonds, plays an essential role in various biological processes. Previous studies often described the force-extension relationship of receptor-ligand bond with linear assumption. However, the force-extension relationship of the bond is intrinsically nonlinear, which should have significant influence on the mechanical behavior of cell adhesion. In this work, a nonlinear mechanical model for cell adhesion is developed, and the adhesive strength was studied at various bond distributions. We find that the nonlinear mechanical behavior of the receptor-ligand bonds is crucial to the adhesive strength and stability. This nonlinear behavior allows more bonds to achieve large bond force simultaneously, and therefore the adhesive strength becomes less sensitive to the change of bond density at the outmost periphery of the adhesive area. In this way, the strength and stability of cell adhesion are soundly enhanced. The nonlinear model describes the cell detachment behavior better than the linear model.
authors.affiliation: State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Kong
authors.forename: Baohua
authors.initials: B
authors.lastname: Ji
authors.forename: Lanhong
authors.initials: L
authors.lastname: Dai
mesh_terms: D000818:Animals; D002448:Cell Adhesion / Q000502:physiology*; D002462:Cell Membrane / Q000378:metabolism / Q000502:physiology; D004548:Elasticity; D008024:Ligands; D008954:Models, Biological; D011956:Receptors, Cell Surface / Q000378:metabolism; D013314:Stress, Mechanical
chemical_list: D008024:Ligands; D011956:Receptors, Cell Surface