Sphingosine inhibits phorbol 12-myristate 13-acetate-, but not serum-induced, activation of Na+/H+ exchange in mammalian cells

Addition of serum to quiescent mammalian cells in culture initiates a series of events which culminates in DNA replication and cell division. One of the earliest events in this sequence of events is activation of Na+/H+ exchange, which can result in an increase in intracellular pH (pHin). The regula...

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