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Relationship between cerebral interstitial levels of amino acids and phosphorylation potential during secondary energy failure in hypoxic-ischemic newborn piglets.

Abstract
The aim of this study was to determine the validity of the hypothesis that excitatory amino acids are related to phosphorylation potential during primary and secondary cerebral energy failure observed in asphyxiated infants. We report here the results of experiments using newborn piglets subjected to severe transient cerebral hypoxia-ischemia followed by resuscitation. We examined cerebral energy metabolism by phosphorus nuclear magnetic resonance spectroscopy and changes in levels of amino acid neurotransmitters in the cortex by microdialysis before, during, and up to 24 h after the hypoxic-ischemic insult. The concentrations of aspartate, glutamate, taurine, and gamma-aminobutyric acid were significantly elevated during the hypoxic-ischemic insult compared with prebaseline values. Shortly after resuscitation, glutamate, taurine, and gamma-aminobutyric acid concentrations decreased but then began to increase again. These secondary elevations were greater than the primary elevations. A negative linear correlation was found between primary interstitial levels of glutamate and taurine and minimum values of phosphocreatine/inorganic phosphate during the secondary energy failure. The cerebral energy state depended on the time course of changes in excitatory amino acids, suggesting that amino acids play distinct roles during the early and delayed phases of injury.
AuthorsTakashi Kusaka, Satoshi Matsuura, Yuka Fujikawa, Kensuke Okubo, Kou Kawada, Masanori Namba, Hitoshi Okada, Tadashi Imai, Kenichi Isobe, Susumu Itoh
JournalPediatric research (Pediatr Res) Vol. 55 Issue 2 Pg. 273-9 (Feb 2004) ISSN: 0031-3998 [Print] United States
PMID14630993 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Amino Acids
  • Phosphates
  • Phosphorus Isotopes
  • Phosphocreatine
Topics
  • Amino Acids (metabolism)
  • Animals
  • Animals, Newborn
  • Brain (metabolism)
  • Energy Metabolism (physiology)
  • Extracellular Fluid (metabolism)
  • Hypoxia-Ischemia, Brain (metabolism)
  • Magnetic Resonance Spectroscopy
  • Phosphates (metabolism)
  • Phosphocreatine (metabolism)
  • Phosphorus Isotopes
  • Phosphorylation
  • Swine

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