Serum, platelet-derived growth factor, vasopressin and phorbol esters increase intracellular pH in Swiss 3T3 cells

Addition of the growth-promoting agents phorbol esters, vasopressin, platelet-derived growth factor or fresh serum to quiescent cultures of Swiss 3T3 cells causes a significant increase in the uptake of 5,5-dimethyl oxazolidine-2-4-dione (DMO), a sensitive measure of intracellular pH. The results further indicate that cytoplasmic alkalinization is an early event associated with the action of a variety of mitogenic compounds.