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- W1995019786 abstract "Activation of cells is frequently followed by tyrosine phosphorylation of proteins. To quantify this process, we developed a ratiometric enzyme-linked immunosorbent assay (ELISA) using epidermal growth factor receptors (EGFR) as a model. Microtiter dishes were coated with anti-EGFR monoclonal antibodies to capture the receptor followed by parallel detection of receptor and phosphotyrosine content with secondary antibodies. The ratio of these two parameters was found to directly reflect EGFR activation and was insensitive to the effect of receptor downregulation. Our assay could resolve differences in EGFR activation due to small changes (less than 1 ng/ml) in ligand. We found that phosphotyrosine detection by ELISA was 8- to 32-fold more sensitive than Western blot detection and could be reliably detected using as little as 4 ng of cellular lysate. Detection of EGFR levels by ELISA was 30 times more sensitive than Western blot analysis and was reliable for as low as 8 ng of cellular lysate per well. Because of the wide linear range of the ELISA, we could directly compare receptor activation in cell types with different EGFR expression levels. Our assay provides a rapid and sensitive method of determining EGFR activation status and could be easily modified to evaluate any tyrosine-phosphorylated protein." @default.
- W1995019786 created "2016-06-24" @default.
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- W1995019786 date "2000-01-01" @default.
- W1995019786 modified "2023-10-14" @default.
- W1995019786 title "Ratiometric Assay of Epidermal Growth Factor Receptor Tyrosine Kinase Activation" @default.
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- W1995019786 doi "https://doi.org/10.1006/abio.1999.4387" @default.
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