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Among the sequelae of ras oncogene expression are intracellular alkalinization and increase of cell volume, both phenomena attributed at least in part to activation of the Na+/H+ exchanger. The present study was performed to elucidate the effects of HOE 694--a novel inhibitor of the Na+/H+ exchanger--on intracellular pH, cell volume, cytoarchitecture and cell proliferation of ras oncogene expressing NIH 3T3 fibroblasts. Following transient exposure of the cells to 20 mmol/l NH3/NH4+, intracellular pH decreases sharply. The following slow realkalinization is completely blocked by 10 mumol/1 HOE 694. Half-maximal inhibition is achieved by 100 nmol/l HOE 694. Cell proliferation is inhibited by HOE 694 with similar potency, whereas the increase in cell volume and cytoskeletal transformation are not prevented, even by 10 mumol/l HOE 694.
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