title: Distinct mechanical behavior of HEK293 cells in adherent and suspended states.
abstract: The mechanical features of individual animal cells have been regarded as indicators of cell type and state. Previously, we investigated the surface mechanics of cancer and normal stromal cells in adherent and suspended states using atomic force microscopy. Cancer cells possessed specific mechanical and actin cytoskeleton features that were distinct from normal stromal cells in adherent and suspended states. In this paper, we report the unique mechanical and actin cytoskeletal features of human embryonic kidney HEK293 cells. Unlike normal stromal and cancer cells, the surface stiffness of adherent HEK293 cells was very low, but increased after cell detachment from the culture surface. Induced actin filament depolymerization revealed that the actin cytoskeleton was the underlying source of the stiffness in suspended HEK293 cells. The exclusive mechanical response of HEK293 cells to perturbation of the actin cytoskeleton resembled that of adherent cancer cells and suspended normal stromal cells. Thus, with respect to their special cell-surface mechanical features, HEK293 cells could be categorized into a new class distinct from normal stromal and cancer cells.
authors.affiliation: Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University , Toyonaka, Osaka , Japan.
authors.forename: Seyed Mohammad Ali
authors.initials: SM
authors.lastname: Haghparast
authors.affiliation: Department of Life and Environment Engineering, Faculty of Environmental Engineering, The University of Kitakyushu , Kitakyushu, Fukuoka , Japan.
authors.forename: Takanori
authors.initials: T
authors.lastname: Kihara
authors.affiliation: Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University , Toyonaka, Osaka , Japan.
authors.forename: Jun
authors.initials: J
authors.lastname: Miyake
keywords: Actin cytoskeleton; Adherent state; Atomic force microscopy; HEK293 cells; Mechanical features; Suspended state