Hypoxic and hypoglycaemic changes of intracellular pH in cerebral cortical pyramidal neurones

Thomas Knöpfel, Alessandro Tozzi, Antonio Pisani, Paolo Calabresi, Giorgio Bernardi

Research output: Contribution to journalArticle

Abstract

Intracellular pH and membrane potential were measured during hypoxia and/or hypoglycaemia in cortical pyramidal neurones of a rat cortical slice preparation. Intracellular pH (pH(i)) was calculated from ratiometric microfluorometry of the pH-sensitive dye BCECF injected via sharp recording microelectrodes into the neurones. Transient (5 min) hypoxia induced a fall of pH(i) (7.12 ± 0.03) of -0.72 ± 0.11 pH units while transient (10 min) hypoglycaemia induced an increase of 0.37 ± 0.09 pH units. Hypoglycaemia did not prevent the hypoxic acidification. Lowering extracellular Na+ induced a membrane hyperpolarization and alkalinization by 0.29 ± 0.12 pH units but did not affect the development or recovery of the hypoxic acidification. The alkalinization during hypoglycaemia suggested that there is some anaerobic glycolysis under normoglycemic conditions. The hypoxic acidification, however, is unlikely to result from anaerobic glycolysis or reversal of Na+- dependent H+ extrusion.

Original languageEnglish
Pages (from-to)1447-1450
Number of pages4
JournalNeuroReport
Volume9
Issue number7
Publication statusPublished - May 11 1998

Keywords

  • BCECF
  • Energy deprivation
  • Imaging
  • Ion homeostasis
  • Rat

ASJC Scopus subject areas

  • Neuroscience(all)

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