Hypoglycemia, hypoxia, and ischemia in a corticostriatal slice preparation: Electrophysiologic changes and ascorbyl radical formation

Jens Z. Pedersen, Giorgio Bernardi, Diego Centonze, Antonio Pisani, Luisa Rossi, Giuseppe Rotilio, Paolo Calabresi

Research output: Contribution to journalArticle

Abstract

Experimental and clinical data suggest that oxygen and/or glucose deprivation alters electrical transmission in the brain and generates free radicals, which may mediate neuronal death. We have analyzed the effects of oxygen and/or glucose deprivation on both excitatory transmission, by measuring field potential amplitude, and free radical production, by using electron spin resonance (ESR) spectroscopy, in a corticostriatal slice preparation. Combined oxygen and/or glucose deprivation (ischemia) lasting 10 to 20 minutes induced a long-term depression of field potential amplitude. The ascorbyl radical could only be detected in brain slices during the reperfusion-phase after 30 minutes of ischemia. It appeared in the early minutes after the washout of ischemic medium and remained stable throughout the reperfusion phase. This radical was never detected in the external medium. Ischemia induced only a slight, but progressive, release of lactate dehydrogenase (LDH) into the external medium during the reperfusion phase. In contrast, exposure of slices to hypoxia or hypoglycemia alone resulted in transient depression of field potential amplitude, and no generation of ascorbyl radicals was observed on reperfusion. We propose that the long- lasting loss of electrical signals is the early sign of neuronal damage during ischemia. On the other hand, ascorbyl radical formation may be considered an indicator of neuronal injury after prolonged energy deprivation.

Original languageEnglish
Pages (from-to)868-875
Number of pages8
JournalJournal of Cerebral Blood Flow and Metabolism
Volume18
Issue number8
Publication statusPublished - Aug 1998

Keywords

  • Corticostriatal slices
  • Field potentials
  • Free radicals
  • Hypoglycemia
  • Hypoxia
  • Ischemia

ASJC Scopus subject areas

  • Endocrinology
  • Neuroscience(all)
  • Endocrinology, Diabetes and Metabolism

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