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  • Title: Phorbol esters and chemotactic factor induce distinct changes in cytoplasmic Ca2+ and pH in granulocytic like HL60 cells.
    Author: Ladoux A, Krawice I, Damais C, Frelin C.
    Journal: Biochim Biophys Acta; 1989 Sep 04; 1013(1):55-9. PubMed ID: 2790039.
    Abstract:
    Differentiation of HL60 cells into neutrophil-like cells after exposure to dimethylsulfoxide is accompanied by an increase in intracellular pH (pHi) which results from an increased activity of the Na+/H+ antiporter at physiological pHi value, but not at acidic pHi values. The functional responses of differentiated HL60 cells to the chemotactic peptide, N-formylmethionylleucylphenylalanine (fMLP), and to phorbol myristate acetate (PMA) were studied. In differentiated cells fMLP produced a large increase in cytosolic Ca2+ levels and a small biphasic change in pHi, whereas PMA produced cellular acidification, which was potentiated by ethylisopropylamiloride and no change in [Ca2+]i. In undifferentiated HL60 cells, PMA produced the opposite effect on pHi, i.e., a cellular alkalinization. The extent of the acidification produced by PMA in differentiated HL60 cells correlated with the production of reactive oxygen species.
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