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Journal of Experimental Biology, Vol 196, Issue 1 337-345, Copyright © 1994 by Company of Biologists
JOURNAL ARTICLES |
L Bianchini and J Poussegur
Centre de Biochimie-CNRS, Universite de Nice, France.
Na+/H+ exchangers (NHE), also called antiporters, are vital transmembrane transporters involved in multiple cellular functions including the regulation of intracellular pH, the control of cell volume and transepithelial ion transport. These transporters are highly regulated by a remarkably wide variety of stimuli which can modulate their expression level and activity. Five isoforms of Na+/H+ exchangers have been cloned and characterized to date; they define a new gene family of vertebrate transporters. These isoforms share the same overall structure but exhibit differences with respect to amiloride-sensitivity, cellular localization, kinetic variables, regulation by various stimuli and plasma membrane targeting in polarized epithelial cells. Biochemical techniques and molecular genetics tools provide the means of analyzing these transporters at the molecular level. The purpose of this manuscript is to give an overview of the main features of the Na+/H+ exchangers with emphasis on recent advances in comprehension of the structure-function relationship and regulation mechanisms of the ubiquitous isoform: NHE-1.
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