title: Cell-based screening for membranal and cytoplasmatic markers using dielectric spectroscopy.
abstract: Dielectric spectroscopy (DS) of living biological cells is based on the analysis of the complex dielectric permittivity of cells suspended in a physiological medium. It provides knowledge on the polarization-relaxation response of cells to external electric field as function of the excitation frequency. This response is strongly affected by both structural and molecular properties of cells and therefore, can reveal rare insights on cell physiology and behaviour. This study demonstrates the mapping potential of DS after cytoplasmatic and membranal markers for cell-based screening analysis. The effect of membrane permittivity and cytoplasm conductivity was examined using tagged MBA and MDCK cell lines respectively. Comparing the permittivity spectra of tagged and native cell lines reveals clear differences between the analyzed suspensions. In addition, differences on the matching dielectric properties of cells were obtained. Those findings support the high distinction resolution and sensitivity of DS after fine molecular and cellular changes, and hence, highlight the high potential of DS as non invasive screening tool in cell biology research.
authors.affiliation: Department of Electrical Engineering, Faculty of Engineering, Tel-Aviv University, Israel. amitron@eng.tau.ac.il
authors.forename: Amit
authors.initials: A
authors.lastname: Ron
authors.forename: Ragini Raj
authors.initials: RR
authors.lastname: Singh
authors.forename: Nick
authors.initials: N
authors.lastname: Fishelson
authors.forename: Irena
authors.initials: I
authors.lastname: Shur
authors.forename: Rina
authors.initials: R
authors.lastname: Socher
authors.forename: Dafna
authors.initials: D
authors.lastname: Benayahu
authors.forename: Yosi
authors.initials: Y
authors.lastname: Shacham-Diamand
mesh_terms: D000818:Animals; D015415:Biomarkers; D002460:Cell Line; D002462:Cell Membrane / Q000502:physiology*; D003593:Cytoplasm / Q000502:physiology*; D004285:Dogs; D025802:Electric Capacitance; D004574:Electromagnetic Fields; D004594:Electrophysiology; D004847:Epithelial Cells / Q000166:cytology / Q000502:physiology; D007668:Kidney / Q000166:cytology; D008403:Mass Screening; D018625:Microscopy, Atomic Force; D008954:Models, Biological; D010006:Osteoblasts / Q000166:cytology / Q000502:physiology; D013057:Spectrum Analysis
chemical_list: D015415:Biomarkers