... carrier transport system exhibited the properties of a Ca 2+ /Na + antiporter capable of exchanging external Ca 2+ with intravesicular Na + or Li + . Kinetic analysis of the Na + -dependence of the antiport indicated that at least three Na + were exchanged with each Ca 2+ ( n =2.91±0.22). When Li...

...-insensitive carrier-mediated transport system; and (3) a verapamil-inhibited channel process responsive to transmembrane potential. Both carrier-mediated processes were antiporters and capable of exchanging external Ca 2+ with intravesicular Na + or H + . The kinetic parameters of both carrier-mediated...

... (cotransport) or antiport (countertransport) with either sodium or hydrogen ions. The energy invested in the uphill translocation of solutes is ultimately provided by hydrolysis of ATP by Na + -or H + -transporting ATPases and is transiently stored as potential energy in the form of an electrochemical gradient...

...Nicolas Demaurex; Sergio Grinstein ABSTRACT Na + /H + antiport is a major determinant of intracellular pH (pHi) and also plays an important role in the maintenance of cellular volume. Na + /H + exchange through NHE-1, the ubiquitous isoform of the antiporter, is accelerated by cytosolic...

...Claudine Kimura; Gregory A. Ahearn; Liz Busquets-Turner; S. R. Haley; Cherie Nagao; H. Gert De Couet ABSTRACT Epithelial plasma membranes from crustacean gut, kidney and gills have been shown recently to display an electrogenic 2Na + /1H + antiporter that differs considerably in its physiological...