Enhancement of collecting duct renin in angiotensin II-dependent hypertensive rats

Hypertension
Minolfa Prieto-CarrasqueroL Gabriel Navar

Abstract

Distal nephron renin may provide a possible pathway for angiotensin (Ang) I generation from proximally delivered angiotensinogen. To examine the effects of Ang II on distal nephron renin, we compared renin protein and mRNA expression in control and Ang II-infused rats. Kidneys from sham (n=9) and Ang II-infused (80 ng/kg per minute, 13 days, n=10) Sprague-Dawley rats were processed by immunohistochemistry, Western blot, reverse transcriptase-polymerase chain reaction (RT-PCR), and quantitative real-time RT-PCR. Ang II infusion increased systolic blood pressure (181+/-4 versus 115+/-5 mm Hg) and suppressed plasma and kidney cortex renin activity. Renin immunoreactivity was suppressed in juxtaglomerular apparatus (JGA) cells in Ang II-infused rats compared with sham (0.1+/-0.1 versus 1.0+/-0.1 relative ratio) but increased in distal nephron segments (6.4+/-1.4 versus 1.0+/-0.1 cortex; 2.5+/-0.3 versus 1.0+/-0.2 medulla). Tubular renin immunostaining was apically distributed in principal cells colocalizing with aquaporin-2 in connecting tubules and cortical and medullary collecting ducts. Renin protein levels were decreased in the kidney cortex of Ang II-infused rats compared with that of sham (0.4+/-0.2 versus 1.0+/-0.4) rats but...Continue Reading

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Citations

May 1, 2012·Pflügers Archiv : European journal of physiology·Manne KropMarcel E Meima
Sep 20, 2012·Pflügers Archiv : European journal of physiology·Minolfa C PrietoL Gabriel Navar
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May 5, 2005·American Journal of Physiology. Renal Physiology·Minolfa C Prieto-CarrasqueroL Gabriel Navar
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