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• W2169447002 abstract "Glucose transport rates are estimated noninvasively in physiological and pathological states by kinetic imaging using PET. The glucose analog most often used is 18 F-labeled 2FDG. Compared with glucose, 2FDG is poorly transported by intestine and kidney. We examined the possible use of 6FDG as a tracer of glucose transport. Lacking a hydroxyl at its 6th position, 6FDG cannot be phosphorylated as 2FDG is. Prior studies have shown that 6FDG competes with glucose for transport in yeast and is actively transported by intestine. Its uptake by muscle has been reported to be unresponsive to insulin, but that study is suspect. We found that insulin stimulated 6FDG uptake 1.6-fold in 3T3-L1 adipocytes and azide stimulated the uptake 3.7-fold in Clone 9 cells. Stimulations of the uptake of 3OMG, commonly used in transport assays, were similar, and the uptakes were inhibited by cyclochalasin B. Glucose transport is by GLUT1 and GLUT4 transporters in 3T3-L1 adipocyte and by the GLUT1 transporter in Clone 9 cells. Cytochalasin B inhibits those transporters. Rats were also imaged in vivo by PET using 6 18 FDG. There was no excretion of 18 F into the urinary bladder unless phlorizin, an inhibitor of active renal transport, was also injected. 18 F activity in brain, liver, and heart over the time of scanning reached a constant level, in keeping with the 6FDG being distributed in body water. In contrast, 18 F from 2 18 FDG was excreted in relatively large amounts into the bladder, and 18 F activity rose with time in heart and brain in accord with accumulation of 2 18 FDG-6-P in those organs. We conclude that 6FDG is actively transported by kidney as well as intestine and is insulin responsive. In trace quantity, it appears to be distributed in body water unchanged. These results provide support for its use as a valid tracer of glucose transport." @default.
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• W2169447002 date "2007-07-01" @default.
• W2169447002 modified "2023-09-23" @default.
• W2169447002 title "6-Fluoro-6-deoxy-<scp>d</scp>-glucose as a tracer of glucose transport" @default.
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• W2169447002 doi "https://doi.org/10.1152/ajpendo.00022.2007" @default.
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