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We used primary cultures of rat hippocampal tissue to estimate the contribution of anion exchange (AE) proteins to the regulation of intracellular pH in neurones and astrocytes. After induction of acidosis, neonatal rat astrocytes were able to restore the intracellular pH in the absence of extracellular bicarbonate. Neonatal neurones, however, were able to recover from acidosis only when bicarbonate was present in the extracellular medium. This recovery was inhibited by inhibition of anion exchange and was independent of the presence of sodium ions. Antibodies against AE proteins reacted predominantly with neurones. These data suggest that neurones in particular are dependent on functional AE proteins for the maintenance of their intracellular pH.
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