title: Statistical analysis of cell migration in 3D using the anisotropic persistent random walk model.
abstract: Cell migration through 3D extracellular matrices (ECMs) is crucial to the normal development of tissues and organs and in disease processes, yet adequate analytical tools to characterize 3D migration are lacking. The motility of eukaryotic cells on 2D substrates in the absence of gradients has long been described using persistent random walks (PRWs). Recent work shows that 3D migration is anisotropic and features an exponential mean cell velocity distribution, rendering the PRW model invalid. Here we present a protocol for the analysis of 3D cell motility using the anisotropic PRW model. The software, which is implemented in MATLAB, enables statistical profiling of experimentally observed 2D and 3D cell trajectories, and it extracts the persistence and speed of cells along primary and nonprimary directions and an anisotropic index of migration. Basic computer skills and experience with MATLAB software are recommended for successful use of the protocol. This protocol is highly automated and fast, taking <30 min to analyze trajectory data per biological condition.
authors.affiliation: 1] Department of Chemical and Biomolecular Engineering, The Johns Hopkins University, Baltimore, Maryland, USA. [2] Johns Hopkins Physical Science Oncology Center, The Johns Hopkins University, Baltimore, Maryland, USA.
authors.forename: Pei-Hsun
authors.initials: PH
authors.lastname: Wu
authors.affiliation: 1] Department of Chemical and Biomolecular Engineering, The Johns Hopkins University, Baltimore, Maryland, USA. [2] Johns Hopkins Physical Science Oncology Center, The Johns Hopkins University, Baltimore, Maryland, USA.
authors.forename: Anjil
authors.initials: A
authors.lastname: Giri
authors.affiliation: 1] Department of Chemical and Biomolecular Engineering, The Johns Hopkins University, Baltimore, Maryland, USA. [2] Johns Hopkins Physical Science Oncology Center, The Johns Hopkins University, Baltimore, Maryland, USA. [3] Department of Pathology, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA. [4] Department of Oncology, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA. [5] Kimmel Comprehensive Cancer Center, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA.
authors.forename: Denis
authors.initials: D
authors.lastname: Wirtz
mesh_terms: D016880:Anisotropy; D002465:Cell Movement / Q000502:physiology*; D060833:Cellular Microenvironment / Q000502:physiology*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008954:Models, Biological; D013269:Stochastic Processes