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The sodium (Na + )/hydrogen (H + ) exchanger 3 (NHE3) and sodium-potassium adenosine triphosphatase (Na + /K + -ATPase) are two of the most important Na +  transporters in the proximal tubules of the kidney. On the apical membrane side, NHE3 primarily mediates the entry of Na +  into and the exit of H +  from the proximal tubules, directly and indirectly being responsible for reabsorbing ~50% of filtered Na +  in the proximal tubules of the kidney. On the basolateral membrane side, Na + /K + -ATPase serves as a powerful engine driving Na +  out of, while pumping K +  into the proximal tubules against their concentration gradients. While the roles of NHE3 and Na + /K + -ATPase in proximal tubular Na +  transport under in vitro conditions are well recognized, their respective contributions to the basal blood pressure regulation and angiotensin II (ANG II)-induced hypertension remain poorly understood. Recently, we have been fortunate to be able to use genetically modified mouse models with global, kidney- or proximal tubule-specific deletion of NHE3 to directly determine the cause and effect relationship between NHE3, basal blood pressure homeostasis, and ANG II-induced hypertension at the whole body, kidney and/or proximal tubule levels. The purpose of this article is to review the genetic and genomic evidence for an important role of NHE3 with a focus in the regulation of basal blood pressure and ANG II-induced hypertension, as we learned from studies using global, kidney- or proximal tubule-specific NHE3 knockout mice. We hypothesize that NHE3 in the proximal tubules is necessary for maintaining basal blood pressure homeostasis and the development of ANG II-induced hypertension.

physiological genomics/physiological genomics (print)

Genetic and genomic evidence for an important role of the Na<sup>+</sup>/H<sup>+</sup>exchanger 3 in blood pressure regulation and angiotensin II-induced hypertension

Genetic and genomic evidence for an important role of the Na+/H+exchanger 3 in blood pressure regulation and angiotensin II-induced hypertension

Genetic and genomic evidence for an important role of the Na⁺/H⁺exchanger 3 in blood pressure regulation and angiotensin II-induced hypertension