title: Spatial Heterogeneity Analysis in Evaluation of Cell Viability and Apoptosis for Colorectal Cancer Cells.
abstract: In evaluation of cell viability and apoptosis, spatial heterogeneity is quantified for cancerous cells cultured in 3-D in vitro cell-based assays under the impact of anti-cancer agents. In 48-h experiments using human colorectal cancer cell lines of HCT-116, SW-620, and SW-480, incubated cells are divided into control and drug administered groups, to be grown in matrigel and FOLFOX solution, respectively. Our 3-D cell tracking and data acquisition system guiding an inverted microscope with a digital camera is utilized to capture bright field and fluorescent images of colorectal cancer cells at multiple time points. Identifying the locations of live and dead cells in captured images, spatial point process and Voronoi tessellation methods are applied to extract morphological features of in vitro cell-based assays. For the former method, spatial heterogeneity is quantified with the second-order functions of Poisson point process, whereas the deviation in the area of Voronoi polygons is computed for the latter. With both techniques, the results indicate that the spatial heterogeneity of live cell locations increases as the viability of in in vitro cell cultures decreases. On the other hand, a decrease is observed for the heterogeneity of dead cell locations with the decrease in cell viability. This relationship between morphological features of in vitro cell-based assays and cell viability can be used for drug efficacy measurements and utilized as a biomarker for 3-D in vitro microenvironment assays.
authors: Electrical Engineering Department The City College of New York City University of New York New York NY 10031 USA.
authors: Aydin
authors: A
authors: Saribudak
authors: Biology Department The City College of New York City University of New York New York NY 10031 USA.
authors: Herman
authors: H
authors: Kucharavy
authors: Biology Department The City College of New York City University of New York New York NY 10031 USA.
authors: Karen
authors: K
authors: Hubbard
authors: Electrical Engineering Department The City College of New York City University of New York New York NY 10031 USA.
authors: Muharrem Umit
authors: MU
authors: Uyar
keywords: Cell viability; FOLFOX treatment; Voronoi tessellation; cell apoptosis; colorectal cancer cell lines; in-vitro cell based assays; morphological features; poisson point process; spatial analysis methods; spatial heterogeneity