Fig. 5.
Developmental switch of NHE8 and NHE3 at the proximal tubule apical membrane. Maturation signals can be from the systemic circulation, intrinsic to the kidney, or both. While there is parallel increase in total cellular and apical membrane NHE3 upon maturation, the decrease in apical NHE8 in the adult is accompanied by increase in intracellular NHE8