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• W2012016296 abstract "Recently, Frey (Cytometry 17:310-318, 1994) demonstrated that TO-PRO-3 iodide (TP3) can be excited indirectly by a 488 nm laser line through energy transfer by propidium iodide (PI). In the present study, we investigated whether PI-TP3 energy transfer can help to overcome spectral cross talk problems associated with the combined use of fluorescein isothiocyanate (FITC), R-phycoerythrin (PE), and PI. Mixtures of keratin 8/18 FITC-labeled, keratin 8/18-PE-labeled, and unlabeled MCF-7 breast carcinoma cells were prepared and stained for DNA with PI (100 microM). The effect of adding a range of TP3 concentrations (0.001 to 16 microM) to these mixtures was evaluated. The combined use of PI and TP3 was further evaluated using mixtures of unlabeled and p53 FITC-labeled COV362.cl4 ovarian cancer cells and mixtures of unlabeled and p53 FITC-labeled COV362.cl4 cells and peripheral blood lymphocytes (PBL), additionally stained for keratin 8/18 (PE). Finally, a human ovarian ascites tumor specimen was triple-stained for keratin 8/18 (PE), vimentin (FITC) and DNA or keratin 8/18 (PE), PCNA (FITC) and DNA. Addition of TP3 allowed complete correction for spectral cross talk of PE/PI into the green fluorescence detector (FL1). Only minimal (FL1 - %FL2) compensation was required at a TP3 concentration of 2.0 microM in the presence of PI (100 microM). The PI spectral cross talk into the orange fluorescence detector (FL2) was reduced by about 50% using the same photomultiplier (PMT) settings. Although addition of TP3 reduced the signal-to-background ratio by about 30%, the advantage gained through full compensation for spectral cross talk resulted in an improved discrimination of p53-positive and -negative subpopulations in a mixture of human PBL and COV362.cl4 cells. Furthermore, vimentin-negative and PCNA-negative cells were better resolved in a human DNA-aneuploid ovarian ascites tumor after staining the DNA with PI/TP3, rather than with PI alone. We conclude that the addition of TP3 to PI improves the combined measurement by single-laser flow cytometry of DNA-ploidy and antigen expression in heterogenous clinical samples." @default.
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• W2012016296 title "Improved single laser measurement of two cellular antigens and DNA-ploidy by the combined use of propidium iodide and TO-PRO-3 iodide" @default.
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• W2012016296 doi "https://doi.org/10.1002/(sici)1097-0320(19970801)28:4<329::aid-cyto9>3.0.co;2-6" @default.
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