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- W2255184328 abstract "Transport and phosphorylation of 2-fluoroadenosine (F-AR) were studied in human erythrocytes and porcine aortic endothelial cells by 19F-nuclear magnetic resonance (NMR) spectroscopy. F-AR (590 microM) added to a human erythrocyte suspension (15% hematocrit) was rapidly incorporated into adenine nucleotides at a rate of 38 nmol.min-1.ml red blood cells-1. Intracellular F-AR could be distinguished from extracellular F-AR due to a chemical shift difference of 0.43 +/- 0.03 ppm (n = 5 experiments). Compared with F-AR, fluoro-ATP purified by high-performance liquid chromatography (HPLC) exhibited a chemical shift of -0.052 ppm, which was too small to differentiate intracellular F-AR and fluoro-ATP in vivo. F-AR uptake was decreased by inhibition of membrane transport with dipyridamole (25 microM) or blockade of adenosine kinase by iodotubercidin (10 microM). The time course of F-AR uptake suggested that the rate-limiting step was not membrane transport but the intracellular phosphorylation by adenosine kinase. In porcine aortic endothelial cells grown on microcarrier beads and perfused within the magnet, there was a linear relation between the F-AR concentration applied (2, 4, 8, or 32 microM) and net uptake measured (27-827 pmol.min-1.mg-1). Intra- and extracellular fluoroadenine compounds were separated by 0.12 ppm, and HPLC analysis confirmed F-AR conversion to fluoroadenine nucleotides. Our findings demonstrate that cellular transport and metabolism of F-AR can be noninvasively studied and analyzed by 19F-NMR." @default.
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- W2255184328 date "1994-04-01" @default.
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- W2255184328 title "2-Fluoroadenosine uptake by erythrocytes and endothelial cells studied by 19F-NMR" @default.
- W2255184328 doi "https://doi.org/10.1152/ajpheart.1994.266.4.h1596" @default.
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