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• W1982481882 abstract "Background The fluorogenic alkaline phosphatase (AP) substrate 2-(5'-chloro-2'-phosphoryloxyphenyl)-6-chloro-4-(3H)-quinazolinone (ELF®-97 phosphate, for Enzyme-Labeled Fluorescence) has been used primarily in microscope-based imaging applications to detect endogenous AP activity, antigens and various ligands in cells and tissues, and nucleic acid hybridization. In a previous study, we demonstrated the applicability of ELF-97 phosphate for detecting endogenous AP activity by flow cytometry. In this study, we show that the spectral characteristics and high signal-to-noise ratio provided by the ELF-97 phosphate make it a useful label for immunodetection via flow cytometry. It can be combined with a variety of other fluorochromes for multiparametric flow cytometry analysis of both endogenous AP activity and intracellular and extracellular immunolabeling with AP-conjugated antibodies. Methods ELF-97 phosphate detection of endogenous AP activity in UMR-106 rat osteosarcoma cells was combined with intracellular antigen detection using Oregon Green 488 dye-conjugated secondary antibodies and DNA content analysis using propidium iodide (PI) or 7-aminoactinomycin D (7-AAD). ELF-97 phosphate detection of endogenous AP was also tested for spectral compatibility with a variety of other commonly used fluorochromes. ELF-97 phosphate was then used to directly label intracellular antigens via AP-conjugated antibodies, again combined with the analysis of DNA content using PI and 7-AAD. ELF-97 phosphate was also used to directly detect extracellular antigens. It was combined with Oregon Green 488 dye, phycoerythrin (PE), and PE-Cy5 dye-labeled antibodies for simultaneous four-color analysis. All samples were analyzed on a dual-beam flow cytometer, with UV excitation of the ELF-97 alcohol reaction product. Results Application of the ELF-97 phosphate to detect AP was found to be compatible with immunodetection and DNA staining techniques. It was also spectrally compatible with a variety of other fluorochromes. Endogenous AP activity could be detected simultaneously with both intracellular antigens labeled using Oregon Green 488 dye, PE, Cy5 dye and Alexa Fluor 568 dye-conjugated antibodies, and DNA content analysis with PI or 7-AAD. This multiparametric assay accurately delineated the distribution of AP in cycling cells and was able to identify cell subsets with varying endogenous AP levels. The ELF-97 alcohol reaction product was found to be an effective label for intracellular antigen immunolabeling with AP-conjugated reagents, and could also be combined with PI and 7-AAD. ELF-97 phosphate was also found to be a useful label for extracellular antigen immunolabeling with AP conjugates, and was compatible with Oregon Green 488 dye, PE, and PE-Cy5 dye-labeled antibodies for four-color surface labeling with minimal spectral overlap and color compensation. Conclusions ELF-97 phosphate was shown to be a useful label for both endogenous and antibody-conjugated AP activity as detected by flow cytometry. Its spectral characteristics allow it to be combined with a variety of fluorochromes for multiparametric analysis. Cytometry 43:117–125, 2001. Published 2001 Wiley-Liss, Inc." @default.
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• W1982481882 date "2001-01-01" @default.
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• W1982481882 title "Detection of endogenous and antibody-conjugated alkaline phosphatase with ELF-97 phosphate in multicolor flow cytometry applications" @default.
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• W1982481882 doi "https://doi.org/10.1002/1097-0320(20010201)43:2<117::aid-cyto1026>3.0.co;2-k" @default.
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