Collecting duct prorenin receptor knockout reduces renal function, increases sodium excretion, and mitigates renal responses in ANG II-induced hypertensive mice

Minolfa C. Prieto, Virginia Reverte, Mykola Mamenko, Marta Kuczeriszka, Luciana C. Veiras, Carla B. Rosales, Matthew McLellan, Oliver Gentile, V. Behrana Jensen, Atsuhiro Ichihara, Alicia A. McDonough, Oleh M. Pochynyuk, Alexis A. Gonzalez

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Augmented intratubular angiotensin (ANG) II is a key determinant of enhanced distal Na+ reabsorption via activation of epithelial Na+ channels (ENaC) and other transporters, which leads to the development of high blood pressure (BP). In ANG II-induced hypertension, there is increased expression of the prorenin receptor (PRR) in the collecting duct (CD), which has been implicated in the stimulation of the sodium transporters and resultant hypertension. The impact of PRR deletion along the nephron on BP regulation and Na+ handling remains controversial. In the present study, we investigate the role of PRR in the regulation of renal function and BP by using a mouse model with specific deletion of PRR in the CD (CDPRR-KO). At basal conditions, CDPRR-KO mice had decreased renal function and lower systolic BP associated with higher fractional Na+ excretion and lower ANG II levels in urine. After 14 days of ANG II infusion (400 ng·kg−1·min−1), the increases in systolic BP and diastolic BP were mitigated in CDPRR-KO mice. CDPRR-KO mice had lower abundance of cleaved αENaC and γENaC, as well as lower ANG II and rennin content in urine compared with wild-type mice. In isolated CD from CDPRR-KO mice, patch-clamp studies demonstrated that ANG IIdependent stimulation of ENaC activity was reduced because of fewer active channels and lower open probability. These data indicate that CD PRR contributes to renal function and BP responses during chronic ANG II infusion by enhancing renin activity, increasing ANG II, and activating ENaC in the distal nephron segments.

Original languageEnglish (US)
Pages (from-to)F1243-F1253
JournalAmerican Journal of Physiology - Renal Physiology
Volume313
Issue number6
DOIs
StatePublished - Dec 2017

Keywords

  • Blood pressure
  • Distal tubular Na transport
  • Prorenin
  • Renin-angiotensin system
  • Rennin

ASJC Scopus subject areas

  • Physiology
  • Urology

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    Prieto, M. C., Reverte, V., Mamenko, M., Kuczeriszka, M., Veiras, L. C., Rosales, C. B., McLellan, M., Gentile, O., Behrana Jensen, V., Ichihara, A., McDonough, A. A., Pochynyuk, O. M., & Gonzalez, A. A. (2017). Collecting duct prorenin receptor knockout reduces renal function, increases sodium excretion, and mitigates renal responses in ANG II-induced hypertensive mice. American Journal of Physiology - Renal Physiology, 313(6), F1243-F1253. https://doi.org/10.1152/ajprenal.00152.2017