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- W2565584908 abstract "Abstract KRAS is very commonly mutated resulting in a constitutively activated protein, which is independent of epidermal growth factor receptor (EGFR) ligand binding and resistant to anti-EGFR therapy. Although KRAS is frequently studied, there is still no uniform standard for detecting of KRAS mutations. In this report, a new scintillation proximity assay-based approach is described that determines the relative affinities of wild-type and mutated KRAS to the anti-KRAS antibody. We performed in vitro experiments using normal human colonic cells (CCD18Co), KRAS wild type (Caco-2) and KRAS mutant (HCT 116) cell lines to determine the relative affinities of wild type or mutated KRAS toward an anti-KRAS monoclonal antibody. The process consists of two primary steps: immunoprecipitation from cell lysate to enrich the KRAS protein and the scintillation proximity assay of the immunoprecipitant to determine the relative affinity against the antibody. A fixed concentration of cell lysates was purified by the immunoprecipitation method. The expressions of the KRAS protein in all cell lines was quantitatively confirmed by western blot analysis. For the scintillation proximity assay, the KRAS standard protein was radiolabeled with 125 I by a simple mixing process in the iodogen tube immediately at room temperature immediately before use. The obtained CPM (count per minute) values of were used to calculate the KRAS concentration using purified KRAS as the standard. The calculated relative affinities of 7 μg of Caco-2 and HCT 116 immunoprecipitants for the anti-KRAS antibody were 77 and 0%, respectively. The newly developed scintillation proximity assay-based strategy determines the relative affinities of wild-type or mutated KRAS towards the anti-KRAS monoclonal antibody. This determination can help distinguish mutated KRAS from the wild type protein. The new SPA based approach for detecting KRAS mutations is applicable to many other cancer-related mutations." @default.
- W2565584908 created "2017-01-06" @default.
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- W2565584908 date "2015-10-14" @default.
- W2565584908 modified "2023-10-16" @default.
- W2565584908 title "A new scintillation proximity assay-based approach for the detection of KRAS mutations" @default.
- W2565584908 doi "https://doi.org/10.1515/ract-2015-2426" @default.
- W2565584908 hasPublicationYear "2015" @default.
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