Document Detail

Abnormal iron deposition in renal cells in the rat with chronic angiotensin II administration.
MedLine Citation:
PMID:  11796829     Owner:  NLM     Status:  MEDLINE    
Acute experimental iron loading causes iron to accumulate in the renal tissue. The accumulation of iron may play a role in enhancing oxidant-induced tubular injury by producing increased amounts of reactive oxygen species. From findings in cells from heme oxygenase-1 (HO-1)-deficient mice, HO-1 is postulated to prevent abnormal intracellular iron accumulation. Recently, it has been reported that HO-1 is induced in the renal tubular epithelial cells, in which iron is deposited after iron loading, and that this HO-1 induction may be involved in ameliorating iron-induced renal toxicity. We previously showed that chronic administration of angiotensin II to rats induces HO-1 expression in the tubular epithelial cells. These observations led us to investigate whether there is a link between iron deposition and HO-1 induction in renal tubular cells in rats undergoing angiotensin II infusion. In the present study, rats were given angiotensin II for continuously 7 days. Prussian blue staining revealed the distinct deposits of iron in the proximal tubular epithelial cells after angiotensin II administration. Electron microscopy demonstrated that iron particles were present in the lysosomes of these cells. Histologic and immunohistochemical analyses showed that stainable iron and immunoreactive ferritin and HO-1 were colocalized in the tubular epithelial cells. Treatment of angiotensin II-infused rats with an iron chelator, deferoxamine, blocked the abnormal iron deposition in kidneys and also the induced expression of HO-1 and ferritin expression. Furthermore, deferoxamine treatment suppressed the angiotensin II-induced increase in the urinary excretion of protein and N-acetyl-beta-D-glucosaminidase, a marker of tubular injury; however, deferoxamine did not affect the angiotensin II-induced decrease in glomerular filtration rate. These results suggest that angiotensin II causes renal injury, in part, by inducing the deposition of iron in the kidney.
Nobukazu Ishizaka; Toru Aizawa; Ieharu Yamazaki; Shin-ichi Usui; Ichiro Mori; Kiyoshi Kurokawa; Shiow-Shih Tang; Julie R Ingelfinger; Minoru Ohno; Ryozo Nagai
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Laboratory investigation; a journal of technical methods and pathology     Volume:  82     ISSN:  0023-6837     ISO Abbreviation:  Lab. Invest.     Publication Date:  2002 Jan 
Date Detail:
Created Date:  2002-01-17     Completed Date:  2002-02-14     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0376617     Medline TA:  Lab Invest     Country:  United States    
Other Details:
Languages:  eng     Pagination:  87-96     Citation Subset:  IM    
Department of Cardiovascular Medicine, University of Tokyo Graduate School of Medicine, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan.
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MeSH Terms
Acetylglucosaminidase / urine
Angiotensin II / administration & dosage,  pharmacokinetics,  pharmacology*
Blood Pressure / drug effects
Creatinine / urine
Ferritins / biosynthesis
Heart Rate / drug effects
Heme Oxygenase (Decyclizing) / deficiency
Heme Oxygenase-1
Hemodynamics / drug effects
Iron / blood,  metabolism*
Kidney / drug effects,  metabolism*,  pathology
Kidney Cortex / drug effects,  metabolism
Kidney Medulla / drug effects,  metabolism
Kidney Tubules / drug effects,  metabolism
Membrane Proteins
Mice, Knockout
Urothelium / drug effects,  metabolism
Reg. No./Substance:
0/Membrane Proteins; 11128-99-7/Angiotensin II; 60-27-5/Creatinine; 7439-89-6/Iron; 9007-73-2/Ferritins; EC Oxygenase (Decyclizing); EC Oxygenase-1; EC protein, mouse; EC

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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