We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Hepatic UDP-glucose <sup>13</sup>C isotopomers from [U-<sup>13</sup>C]glucose: A simple analysis by <sup>13</sup>C NMR of urinary menthol glucuronide.
- Authors
Mendes, Ana C.; Caldeira, M. Madalena; Silva, Claudia; Burgess, Shawn C.; Merritt, Matthew E.; Gomes, Filipe; Barosa, Cristina; Delgado, Teresa C.; Franco, Fatima; Monteiro, Pedro; Providencia, Luis; Jones, John G.
- Abstract
Menthol glucuronide was isolated from the urine of a healthy 70-kg female subject following ingestion of 400 mg of peppermint oil and 6 g of 99% [U-13C]glucose. Glucuronide 13C-excess enrichment levels were 4-6% and thus provided high signal-to-noise ratios (SNRs) for confident assignment of 13C-13C spin-coupled multiplet components within each 13C resonance by 13C NMR. The [U-13C]glucuronide isotopomer derived via direct pathway conversion of [U-13C]glucose to [U-13C]UDP-glucose was resolved from [1,2,3-13C3]- and [1,2-13C2]glucuronide isotopomers derived via Cori cycle or indirect pathway metabolism of [U-13C]glucose. In a second study, a group of four overnight-fasted patients (63 ± 10 kg) with severe heart failure were given peppermint oil and infused with [U-13C]glucose for 4 hr (14 mg/kg prime, 0.12 mg/kg/min constant infusion) resulting in a steady-state plasma [U-13C]glucose enrichment of 4.6% ± 0.6%. Menthol glucuronide was harvested and glucuronide 13C-isotopomers were analyzed by 13C NMR. [U-13C]glucuronide enrichment was 0.6% ± 0.1%, and the sum of [1,2,3-13C3] and [1,2-13C2]glucuronide enrichments was 0.9% ± 0.2%. From these data, flux of plasma glucose to hepatic UDPG was estimated to be 15% ± 4% that of endogenous glucose production (EGP), and the Cori cycle accounted for at least 32% ± 10% of GP. Magn Reson Med, 2006. © 2006 Wiley-Liss, Inc.
- Publication
Magnetic Resonance in Medicine, 2006, Vol 56, Issue 5, p1121
- ISSN
0740-3194
- Publication type
Article
- DOI
10.1002/mrm.21057