title: High throughput and automatic colony formation assay based on impedance measurement technique.
abstract: To predict the response of in vivo tumors, in vitro culture of cell colonies was suggested to be a standard assay to achieve high clinical relevance. To describe the responses of cell colonies, the most widely used quantification method is to count the number and size of cell colonies under microscope. That makes the colony formation assay infeasible to be high throughput and automated. In this work, in situ analysis of cell colonies suspended in soft hydrogel was developed based on impedance measurement technique. Cell colonies cultured between a pair of parallel plate electrodes were successfully analyzed by coating a layer of base hydrogel on one side of electrode. Real-time and label-free monitoring of cell colonies was realized during the culture course. Impedance magnitude and phase angle respectively represented the summation effect of colony responses and size of colonies. In addition, dynamic response of drug-treated colonies was demonstrated. High throughput and automatic colony formation assay was realized to facilitate more objective assessments in cancer research. Graphical Abstract High throughput and automatic colony formation assay was realized by in situ impedimetric analysis across a pair of parallel plate electrodes in a culture chamber. Cell colonies suspended in soft hydrogel were cultured under the tested substance and their dynamic response was represented by impedance data.
authors.affiliation: Graduate Institute of Medical Mechatronics, Chang Gung University, 259 Wen-Hua 1st Road, Kweishan, Taoyuan, 333, Taiwan, Republic of China. kflei@mail.cgu.edu.tw.|Department of Mechanical Engineering, Chang Gung University, Taoyuan, 333, Taiwan, Republic of China. kflei@mail.cgu.edu.tw.|Department of Radiation Oncology, Chang Gung Memorial Hospital, Linkou Branch, No. 5, Fuxing St., Taoyuan, 333, Taiwan, Republic of China. kflei@mail.cgu.edu.tw.
authors.forename: Kin Fong
authors.initials: KF
authors.lastname: Lei
authors.affiliation: Graduate Institute of Medical Mechatronics, Chang Gung University, 259 Wen-Hua 1st Road, Kweishan, Taoyuan, 333, Taiwan, Republic of China.
authors.forename: Chich-Hao
authors.initials: CH
authors.lastname: Kao
authors.affiliation: Department of Radiation Oncology, Chang Gung Memorial Hospital, Linkou Branch, No. 5, Fuxing St., Taoyuan, 333, Taiwan, Republic of China. vstsang@cgmh.org.tw.|School of Traditional Chinese Medicine, Chang Gung University, 259 Wen-Hua 1st Road, Kweishan, Taoyuan, 333, Taiwan, Republic of China. vstsang@cgmh.org.tw.
authors.forename: Ngan-Ming
authors.initials: NM
authors.lastname: Tsang
mesh_terms: D002452:Cell Count; D018929:Cell Culture Techniques / Q000295:instrumentation*; D045744:Cell Line, Tumor; D017097:Electric Impedance; D004566:Electrodes; D004867:Equipment Design; D057166:High-Throughput Screening Assays / Q000295:instrumentation; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry
chemical_list: D020136:Hydrogel, Polyethylene Glycol Dimethacrylate
keywords: 3D cell culture; Chemosensitivity; Colony formation assay; Impedance measurement; Parallel plate electrodes