Persistent oxidative stress following renal ischemia-reperfusion injury increases ANG II hemodynamic and fibrotic activity

David Basile, Ellen C. Leonard, Alisa G. Beal, Devin Schleuter, Jessica Friedrich

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Abstract

ANG II is a potent renal vasoconstrictor and profibrotic factor and its activity is enhanced by oxidative stress. We sought to determine whether renal oxidative stress was persistent following recovery from acute kidney injury (AKI) induced by ischemia-reperfusion (I/R) injury in rats and whether this resulted in increased ANG II sensitivity. Rats were allowed to recover from bilateral renal I/R injury for 5 wk and renal blood flow responses were measured. Post-AKI rats showed significantly enhanced renal vasoconstrictor responses to ANG II relative to sham-operated controls and treatment of AKI rats with apocynin (15 mM, in the drinking water) normalized these responses. Recovery from AKI for 5 wk resulted in sustained oxidant stress as indicated by increased dihydroethidium incorporation in renal tissue slices and was normalized in apocynin-treated rats. Surprisingly, the renal mRNA expression for common NADPH oxidase subunits was not altered in kidneys following recovery from AKI; however, mRNA screening using PCR arrays suggested that post-AKI rats had decreased renal Gpx3 mRNA and an increased expression other prooxidant genes such as lactoperoxidase, myeloperoxidase, and dual oxidase-1. When rats were infused for 7 days with ANG II (100 ng·kg -1·min -1), renal fibrosis was not apparent in sham-operated control rats, but it was enhanced in post-AKI rats. The profibrotic response was significantly attenuated in rats treated with apocynin. These data suggest that there is sustained renal oxidant stress following recovery from AKI that alters both renal hemodynamic and fibrotic responses to ANG II, and may contribute to the transition to chronic kidney disease following AKI.

Original languageEnglish
JournalAmerican Journal of Physiology - Renal Physiology
Volume302
Issue number11
DOIs
StatePublished - Jun 1 2012

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Reperfusion Injury
Oxidative Stress
Acute Kidney Injury
Hemodynamics
Kidney
Vasoconstrictor Agents
Oxidants
Messenger RNA
Lactoperoxidase
NADPH Oxidase
Renal Circulation
Chronic Renal Insufficiency
Drinking Water
Peroxidase
Oxidoreductases
Fibrosis
Polymerase Chain Reaction

Keywords

  • Fibrosis
  • Reactive oxygen species

ASJC Scopus subject areas

  • Physiology
  • Urology

Cite this

Persistent oxidative stress following renal ischemia-reperfusion injury increases ANG II hemodynamic and fibrotic activity. / Basile, David; Leonard, Ellen C.; Beal, Alisa G.; Schleuter, Devin; Friedrich, Jessica.

In: American Journal of Physiology - Renal Physiology, Vol. 302, No. 11, 01.06.2012.

Research output: Contribution to journalArticle

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