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The amiloride-sensitive Na+/H+ antiport in 3T3 fibroblasts



The amiloride-sensitive Na+/H+ antiport in 3T3 fibroblasts



Journal of Biological Chemistry 258(10): 6272-6276



BALB/c 3T3 fibroblasts have an amiloride-sensitive Na+ uptake mechanism which is hardly detectable under normal physiological conditions. The activity of this Na+ transport system can be increased to a large extent by treatments that decrease the internal pH such as loss of intracellular NH4+ as NH3 or incubation with nigericin in the presence of a low external K+ concentration. These treatments have made possible an analysis of the interaction of the Na+/H+ antiport with amiloride and of the external pH dependence of the system. The addition of fetal bovine serum to quiescent 3T3 cells stimulates the initial rate of the amiloride-sensitive 22Na+ uptake by only 50%. However, after treatment of the cells with ammonia or nigericin, serum produces a 40-fold stimulation of the rate of the amiloride-sensitive 22Na+ uptake. Control experiments show that serum does not stimulate the activity of the Na+/H+ antiport by an indirect mechanism involving a depolarization of the membrane or a modification of the internal Ca2+ concentration. It is suggested that some serum component directly interacts with the Na+/H+ exchanger to modify its catalytic properties.

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Accession: 044556818

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PMID: 6304031



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