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- W1579207811 abstract "High-field 13C surface coil nuclear magnetic resonance has been employed to investigate glucose and glycogen metabolism in rat liver in vivo. Natural abundance and isotopically enriched proton-decoupled 13C NMR experiments were conducted at 90.56 MHz on a standard commercial spectrometer utilizing a laboratory-built high-sensitivity double-resonance coaxial coil probe. At variance with a previous preliminary report, natural abundance spectra of the liver in vivo from a rat fed ad libitum reveal resonances of substantial intensity from hepatic glycogen with approximately 10 min of signal averaging. The response of hepatic glycogen levels to an intravenous injection of the hormone glucagon was continuously monitored through the glycogen C-1 carbon resonance intensity; this revealed an average 60% depletion of hepatic glycogen stores in vivo within approximately 1 h. In a complementary study utilizing fasted rats, 100 mg of D-[1-13C]glucose (90% enriched) was administered via a peripheral vein injection and continuously monitored by 13C NMR with 3-min time resolution as it was incorporated into hepatic glycogen. The C-1 carbon resonances of hepatic glucose and glycogen are well-resolved in vivo enabling the time course for the relative change in concentration for both metabolites to be established simultaneously. The 13C label incorporated into the glycogen pool reaches a steady-state level in approximately 40 min." @default.
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- W1579207811 date "1984-11-01" @default.
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- W1579207811 title "Direct observation of glycogenesis and glucagon-stimulated glycogenolysis in the rat liver in vivo by high-field carbon-13 surface coil NMR." @default.
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- W1579207811 doi "https://doi.org/10.1016/s0021-9258(18)89795-2" @default.
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