Oxaloacetate decreases the infarct size and attenuates the reduction in evoked responses after photothrombotic focal ischemia in the rat cortex

David Nagy, Mate Marosi, Zsolt Kis, Tamas Farkas, Gabriella Rakos, Laszlo Vecsei, Vivian I. Teichberg, Jozsef Toldi

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

A traumatic brain injury or a focal brain lesion is followed by acute excitotoxicity caused by the presence of abnormally high glutamate (Glu) levels in the cerebrospinal and interstitial fluids. It has recently been demonstrated that this excess Glu in the brain can be eliminated into the blood following the intravenous administration of oxaloacetate (OxAc), which, by scavenging the blood Glu, induces an enhanced and neuroprotective brain-to-blood Glu efflux. In this study, we subjected rats to a photothrombotic lesion and treated them after the illumination with a single 30-min-long administration of OxAc (1.2 mg/100 g, i.v.). Following induction of the lesion, we measured the infarct size and the amplitudes of the somatosensory evoked potentials (SEPs) as recorded from the skull surface. The photothrombotic lesion resulted in appreciably decreased amplitudes of the evoked potentials, but OxAc administration significantly attenuated this reduction, and also the infarct size assessed histologically. We suggest that the neuroprotective effects of OxAc are due to its blood Glu-scavenging activity, which, by increasing the brain-to-blood Glu efflux, reduces the excess Glu responsible for the anatomical and functional correlates of the ischemia, as evaluated by electrophysiological evoked potential (EP) measurements.

Original languageEnglish
Pages (from-to)827-835
Number of pages9
JournalCellular and Molecular Neurobiology
Volume29
Issue number6-7
DOIs
Publication statusPublished - Sep 1 2009

Keywords

  • Evoked potentials
  • Glutamate excitotoxicity
  • Neuroprotection
  • Photothrombotic lesion

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience
  • Cell Biology

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