Redox signaling is an early event in the pathogenesis of renovascular hypertension

Stella P. Hartono, Bruce E. Knudsen, Adeel S. Zubair, Karl A. Nath, Stephen J. Textor, Lilach O. Lerman, Joseph P. Grande

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

Activation of the renin-angiotensin-aldosterone system plays a critical role in the development of chronic renal damage in patients with renovascular hypertension. Although angiotensin II (Ang II) promotes oxidative stress, inflammation, and fibrosis, it is not known how these pathways intersect to produce chronic renal damage. We tested the hypothesis that renal parenchymal cells are subjected to oxidant stress early in the development of RVH and produce signals that promote influx of inflammatory cells, which may then propagate chronic renal injury. We established a reproducible murine model of RVH by placing a tetrafluoroethhylene cuff on the right renal artery. Three days after cuff placement, renal tissue demonstrates no histologic abnormalities despite up regulation of both pro-and anti-oxidant genes. Mild renal atrophy was observed after seven days and was associated with induction of Tnfα and influx of CD3+ T cells and F4/80+ macrophages. By 28 days, kidneys developed severe renal atrophy with interstitial inflammation and fibrosis, despite normalization of plasma renin activity. Based on these considerations, we propose that renal parenchymal cells initiate a progressive cascade of events leading to oxidative stress, interstitial inflammation, renal fibrosis, and atrophy.

Original languageEnglish (US)
Pages (from-to)18640-18656
Number of pages17
JournalInternational journal of molecular sciences
Volume14
Issue number9
DOIs
StatePublished - Sep 10 2013

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Keywords

  • Inflammation
  • Oxidative stress
  • Renin-angiotensin-aldosterone system
  • Renovascular hypertension

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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