Faculty Collaboration Database

Pressure-induced renal injury in angiotensin II versus norepinephrine-induced hypertensive rats. Hypertension 2009 Dec;54(6):1269-77

Date

10/28/2009

Pubmed ID

19858406

Pubmed Central ID

PMC2812436

DOI

10.1161/HYPERTENSIONAHA.109.139287

Scopus ID

2-s2.0-73349112594 (requires institutional sign-in at Scopus site)   42 Citations

Abstract

The susceptibility to renal perfusion pressure (RPP)-induced renal injury was investigated in angiotensin II (Ang II)- versus norepinephrine (NE)-infused hypertensive rats. To determine the magnitude of RPP-induced injury, Sprague-Dawley rats fed a 4% salt diet were instrumented with a servocontrolled aortic balloon occluder positioned between the renal arteries to maintain RPP to the left kidney at baseline levels whereas the right kidney was exposed to elevated RPP during a 2-week infusion of Ang II IV (25 ng/kg per minute), NE IV (0.5, 1.0, and 2.0 microg/kg per minute on days 1, 2, and 3 to 14, respectively), or saline IV (sham rats). Over the 14 days of Ang II infusion, RPP averaged 161.5+/-8.0 mm Hg to uncontrolled kidneys and 121.9+/-2.0 mm Hg to servocontrolled kidneys. In NE-infused rats, RPP averaged 156.3+/-3.0 mm Hg to uncontrolled kidneys and 116.9+/-2.0 mm Hg to servocontrolled kidneys. RPP averaged 111.1+/-1.0 mm Hg to kidneys of sham rats. Interlobular arterial injury and juxtamedullary glomerulosclerosis were largely RPP dependent in both models of hypertension. Superficial cortical glomerulosclerosis was greater and RPP dependent in NE- versus Ang II-infused rats, which was primarily independent of RPP. Outer medullary tubular necrosis and interstitial fibrosis were also primarily RPP dependent in both models of hypertension; however, the magnitude of injury was exacerbated in Ang II-infused rats. We conclude that elevated RPP is the dominant cause of renal injury in both NE- and Ang II-induced hypertensive rats and that underlying neurohumoral factors in these models of hypertension alter the pattern and magnitude of RPP-induced renal injury.

Author List

Polichnowski AJ, Cowley AW Jr

Author

Allen W. Cowley Jr PhD Professor in the Physiology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Angiotensin II
Animals
Blood Pressure
Catheterization
Disease Models, Animal
Fibrosis
Glomerulosclerosis, Focal Segmental
Heart Rate
Hypertension, Renal
Kidney Cortex Necrosis
Male
Norepinephrine
Rats
Rats, Sprague-Dawley
Renal Artery
Sodium Chloride, Dietary
Vasoconstrictor Agents