| Modification Notes |
Na+/H+ exchangers-1-6 (Na+/H+ antiporters, NHE-1-6) are integral membrane proteins that are expressed in most mammalian tissues where they regulate intracellular pH and cell volume (1-3). NHEs mediate the secondary active extrusion of hydrogen (H+) ions out of cells in exchange for extracellular sodium (Na+) (1,2). Excluding NHE-1, which is ubiquitously expressed, the NHE isoforms 2-6 have distinct tissue- and cell type–dependent expression, and inhibitory characteristics by amiloride analogs (2,3,5). Human NHE-2 protein, known also as solute carrier family 9 isoform-2, SLC9A2, is an 812 amino acid protein that is expressed in skeletal muscle, colon, kidney, testis, prostate, ovary, and small intestine (6). |