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The physiological significance of the renal tubular prorenin receptor (PRR) has been difficult to elucidate due to developmental abnormalities associated with global or renal-specific PRR knockout (KO). We recently developed an inducible renal tubule-wide PRR KO using the Pax8/LC1 transgenes and demonstrated that disruption of renal tubular PRR at 1 mo of age caused no renal histological abnormalities. Here, we examined the role of renal tubular PRR in blood pressure (BP) regulation and Na +  excretion and investigated the signaling mechanisms by which PRR regulates Na +  balance. No detectable differences in BP were observed between control and PRR KO mice fed normal- or low-Na +  diets. However, compared with controls, PRR KO mice had elevated plasma renin concentration and lower cumulative Na +  balance with normal- and low-Na +  intake. PRR KO mice had an attenuated hypertensive response and reduced Na +  retention following angiotensin II (ANG II) infusion. Furthermore, PRR KO mice had significantly lower epithelial Na +  channel (ENaC-α) expression. Treatment with mouse prorenin increased, while PRR antagonism decreased, ENaC activity in isolated split-open collecting ducts (CD). The prorenin effect was prevented by protein kinase A and Akt inhibition, but unaffected by blockade of AT 1 , ERK1/2, or p38 MAPK pathways. Taken together, these data indicate that renal tubular PRR, likely via direct prorenin/renin stimulation of PKA/Akt-dependent pathways, stimulates CD ENaC activity. Absence of renal tubular PRR promotes Na +  wasting and reduces the hypertensive response to ANG II.

Renal tubular epithelial cell prorenin receptor regulates blood pressure and sodium transport