© 1990 by Oxford University Press
Journal of the National Cancer Institute, Vol. 82, No. 13, 1107-1112,
July 4, 1990
© 1990 Oxford University Press
New Colorimetric Cytotoxicity Assay for Anticancer-Drug Screening
Developmental Therapeutics Program, Division of Cancer Treatment
Program Resources, Inc., National Cancer Institute, Frederick Cancer Research Facility Frederick, MD.
Developmental Therapeutics Program, Division of Cancer Treatment, National Cancer Institute Bethesda, MD.
*Correspondence to: Philip Skehan, M.D., Developmental Therapeutics Program, Division of Cancer Treatment, Bldg. 560, Rm. 3260, National Cancer Institute, Frederick Cancer Research Facility, Frederick, MD 21701
We have developed a rapid, sensitive, and inexpensive method for measuring the cellular protein content of adherent and suspension cultures in 96-well microtiter plates. The method is suitable for ordinary laboratory purposes and for very large-scale applications, such as the National Cancer Institute's disease-oriented in vitro anticancer-drug discovery screen, which requires the use of several million culture wells per year. Cultures fixed with trichloroacetic acid were stained for 30 minutes with 0.4% (wt/vol) sul-forhodamine B (SRB) dissolved in 1% acetic acid. Unbound dye was removed by four washes with 1% acetic acid, and protein-bound dye was extracted with 10 mM unbuffered Tris base [tris (hydroxymethyl)aminomethane] for determination of optical density in a computer-interfaced, 96-well microtiter plate reader. The SRB assay results were linear with the number of cells and with values for cellular protein measured by both the Lowry and Bradford assays at densities ranging from sparse subconfluence to multilayered supraconfluence. The signal-to-noise ratio at 564 nm was approximately 1.5 with 1,000 cells per well. The sensitivity of the SRB assay compared favorably with sensitivities of several fluorescence assays and was superior to those of both the Lowry and Bradford assays and to those of 20 other visible dyes. The SRB assay provides a colorimetric end point that is nondestructive, indefinitely stable, and visible to the naked eye. It provides a sensitive measure of drug-induced cytotoxicity, is useful in quantitating clonogenicity, and is well suited to high-volume, automated drug screening. SRB fluoresces strongly with laser excitation at 488 nm and can be measured quantitatively at the single-cell level by static fluorescence cytometry.
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