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Hepatic anaplerotic outflow fluxes are redirected from gluconeogenesis to lactate synthesis in patients with Type 1a glycogen storage disease.

Abstract
Hepatic glucose production and relative Krebs cycle fluxes (indexed to a citrate synthase flux of 1.0) were evaluated with [U-(13)C]glycerol tracer in 5 fed healthy controls and 5 Type 1a glycogen storage disease (GSD1a) patients. Plasma glucose, hepatic glucose-6-phosphate (G6P) and glutamine (13)C-isotopomers were analyzed by (13)C NMR via blood sampling and chemical biopsy. In healthy subjects, 35+/-14% of plasma glucose originated from hepatic G6P while GSD1a patients had no detectable G6P contribution. Compared to controls, GSD1a patients had an increased fraction of acetyl-CoA from pyruvate (0.5+/-0.2 vs. 0.3+/-0.1, p<0.01), and increased pyruvate recycling fluxes (14.4+/-3.8 vs. 8.7+/-2.8, p<0.05). Despite negligible gluconeogenic flux, net anaplerotic outflow was not significantly different from controls (2.2+/-0.8 vs. 1.3+/-0.5). The enrichment of lactate with (13)C-isotopomers derived from the Krebs cycle suggests that lactate was the main anaplerotic product in GSD1a patients.
AuthorsJohn G Jones, Paula Garcia, Cristina Barosa, Teresa C Delgado, Luisa Diogo
JournalMetabolic engineering (Metab Eng) Vol. 11 Issue 3 Pg. 155-62 (May 2009) ISSN: 1096-7184 [Electronic] Belgium
PMID19558966 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Carbon Isotopes
  • Lactates
  • Glutamine
  • Acetyl Coenzyme A
  • Pyruvic Acid
  • Glucose-6-Phosphatase
  • Glucose
  • Glycerol
Topics
  • Acetyl Coenzyme A (metabolism)
  • Adolescent
  • Carbon Isotopes (chemistry)
  • Child
  • Citric Acid Cycle (physiology)
  • Female
  • Gluconeogenesis (physiology)
  • Glucose (metabolism)
  • Glucose-6-Phosphatase (metabolism)
  • Glutamine (blood)
  • Glycerol (metabolism)
  • Glycogen Storage Disease Type I (metabolism)
  • Humans
  • Lactates (blood)
  • Liver (metabolism)
  • Male
  • Pyruvic Acid (metabolism)
  • Young Adult

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