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• W2080333230 abstract "A study on the uptake and radiosensitizing properties of pimonidazole (PIMO) and etanidazole (ETA) was made in vitro with two melanoma cell lines: Na11+ and Na11-. The amelanotic Na11- was derived from the pigmented Na11+ cell line and was characterized by the complete absence of pigmentation in vitro. Plateau-phase cells were heavily pigmented for the Na11+ line whereas exponential cells showed a lower melanin content. Radiosensitivity was studied using an in vitro colony assay; intracellular drug concentration was determined by HPLC. For both cell lines the uptake of PIMO was always higher than the uptake of ETA, and slightly higher in hypoxia than in air. The uptake of PIMO was exceptionally high in plateau-phase cells of the pigmented Na11+ cell line. The radiosensitizing effect of ETA did not differ greatly as a function of the cell kinetics in both cell lines, whereas the radiosensitizing effect of PIMO was cell line-dependent. Sensitization of exponential cells by PIMO was similar in both cell lines but significantly less in plateau-phase cells, with the heavily pigmented Na11+ cell line being least affected, despite a three-fold increase in PIMO uptake observed in plateau cells relative to exponentially growing Na11+ cells. The uptake of PIMO may be related to the high melanin content of plateau-phase Na11+ cells and therefore this in vitro model may be useful for predicting the effects of agents such as PIMO towards melanotic melanomas in vivo." @default.
• W2080333230 created "2016-06-24" @default.
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• W2080333230 date "1993-01-01" @default.
• W2080333230 modified "2023-09-22" @default.
• W2080333230 title "Relationship between Intracellular Concentration and Radiosensitizing Effect of Pimonidazole and Etanidazole on Two Human Melanoma Cell Lines" @default.
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• W2080333230 doi "https://doi.org/10.1080/09553009314550051" @default.
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