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Changes of intracellular pH in human neutrophils were monitored by 9-aminoacridine fluorescence. Both initial acidification and subsequent alkalinization phases induced by a chemotactic peptide, N-formyl-methionyl-leucyl-phenylalanine were dependent on the extracellular Ca2+-concentrations, and a calcium ionophore, A-23187 similarly induced the pH-changes. Pertussis toxin inhibited the pH-changes induced by the peptide while cholera toxin did not. The pH-changes induced by A-23187 were not affected by the toxins. The results suggest that the inhibitory guanine-nucleotide regulatory protein and Ca2+ are involved in the pH-changes induced by the peptide.
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