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• W2080850609 abstract "A method for rapid fluorometric assay of intracellular nitric oxide (NO) formation was developed for use in cultured neuronal cells. In a cell-free system 2,7-dichlorofluorescin (DCF), a non-fluorescent species, is oxidized by NO to dichlorofluorescein, a fluorescent compound. Addition of NO to a solution containing DCF increased the fluorescent signal within 10 s and continued to increase slowly over a 10-min period. The intensity of the fluorescence was dependent upon the concentration of NO. In DCF-loaded PC12 cells, addition of NO markedly increased fluorescence (limit of detection = 16 microM NO) and pretreatment with reduced hemoglobin (Hb) inhibited the NO-mediated increase of fluorescence in both the cell-free system and PC12 cells. In PC12 cells loaded with DCF, the NO generator sodium nitroprusside (SNP) produced a rapid increase of fluorescence. To rule out the possibility that reactive oxygen species (ROS) mediated the increased of fluorescence, superoxide dismutase (SOD) and catalase were added to the cuvette. The enzymes did not alter the fluorescence generated after addition of NO to PC12 cells. This assay was used to determine the ability of glutamate to stimulate NO production in cerebellar granule cells. When 10 microM glutamate was added to DCF-loaded cerebellar granule cells, a rapid increase in fluorescence was noted. The fluorescence was blocked approximately 50% after addition of either Hb or SOD, or by pretreatment with NG-nitro-L-arginine methyl ester (300 microM), a nitric oxide synthase (NOS) inhibitor. It was concluded that glutamate stimulated intracellular generation of both NO and ROS, and at least 50% of the oxidation of DCF was attributed to intracellular generation of NO. These results demonstrate that oxidation of DCF by NO can be used to measure intracellular generation of NO and by adding either Hb or SOD to the cell system, the extent of oxidation of DCF attributed to NO and ROS can be determined." @default.
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• W2080850609 date "1995-09-01" @default.
• W2080850609 modified "2023-09-24" @default.
• W2080850609 title "Monitoring intracellular nitric oxide formation by dichlorofluorescin in neuronal cells" @default.
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• W2080850609 doi "https://doi.org/10.1016/0165-0270(95)00018-p" @default.
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