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Fluorescence-Based Cell Viability Screening Assays Using Water-Soluble Oxygen Probes

Suzanne Floyd

Biochemistry Department, University College Cork, Cork, Ireland.

Aleksi E. Soini

Arctic Diagnostics Oy, Turku, Finland.

Rosemary O'Connor

Biochemistry Department, University College Cork, Cork, Ireland.

Dmitri B. Papkovsky

Biochemistry Department, University College Cork, Cork, Ireland. Luxcel Biosciences Ltd., Dublin, Ireland. d.papkovsky{at}ucc.ie

A simple luminescence-based assay for screening the viability of mammalian cells is described, based on the monitoring of cell respiration by means of a phosphorescent water-soluble oxygen probe that responds to changes in the concentration of dissolved oxygen by changing its emission intensity and lifetime. The probe was added at low concentrations (0.3 µM to 0.5 nM) to each sample containing a culture of cells in the wells of a standard 96-well plate. Analysis of oxygen consumption was initiated by applying a layer of mineral oil on top of each sample followed by monitoring of the phosphorescent signal on a prompt or time-resolved fluorescence plate reader. Rates of oxygen uptake could be determined on the basis of kinetic changes of the phosphorescence (initial slopes) and correlated with cell numbers (10⁵ to 10⁷ cells/mL for FL5.12 lymphoblastic cell line), cell viability, or drug/effector action using appropriate control samples. The assay is cell noninvasive, more simple, robust, and cost-effective than existing microplate-based cell viability assays; is compatible with existing instrumentation; and allows for high-throughput analysis of cell viability. (Journal of Biomolecular Screening 2003:264-272)

Key Words: cell viability assays • high-throughput screening • water-soluble oxygen probe • Pt-porphyrins • time-resolved fluorescence • phosphorescence

Journal of Biomolecular Screening, Vol. 8, No. 3, 264-272 (2003)
DOI: 10.1177/1087057103008003004


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