Cited by 35Chronic Kidney Disease and DiabetesNitric Oxide and Endothelin EffectsRenal Diseases and Glomerulopathies

Double-Edged Action of SOD Mimetic in Diabetic Nephropathy

Asaba, Kensuke, Tojo, Akihiro, Onozato, Maristela Lika, Goto, Atsuo, Fujita, Toshiro·2007·Journal of Cardiovascular Pharmacology

Abstract

Oxidative stress plays an important role in the pathogenesis of diabetic complications, and we investigated the effect of superoxide dismutase (SOD) mimetic, tempol, in diabetic nephropathy. Streptozotocin-induced diabetic rats were treated with tempol from 2 weeks until 8 weeks. The expression of NADPH oxidase, catalase, and myeloperoxidase (MPO), superoxide dismutase activity, and production of peroxide and hypochlorite were evaluated. Tempol treatment prevented the increase in NADPH oxidase and peroxide production in the glomeruli of diabetic rat. Catalase was decreased without change in SOD activity, and MPO was enhanced in the kidney of diabetic rats. Tempol treatment stimulated SOD activity and increased the conversion of superoxide to hydrogen peroxide, and hydrogen peroxide on its hand was converted to hypochlorite by the increased MPO. The reduction of peroxide by tempol was followed by the decrease in TGF-beta and mesangial matrix expansion. However, tempol did not reduce hypochlorite or urinary protein excretion. In conclusion, tempol inhibited glomerular matrix expansion via suppression of peroxide production and TGF-beta, but it failed to reduce proteinuria, probably due to the increased hypochlorite production in diabetic nephropathy.

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Crossref · 10.1097/fjc.0b013e31802b6530

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Authors
Asaba, K., Tojo, A., Onozato, M. L., Goto, A., & Fujita, T.
Affiliations
The University of Tokyo (JP)
Venue
Journal of Cardiovascular Pharmacology
Published
2007-01
Volume
49
Issue
1
Pages
13-19
ISSN
0160-2446 (ISSN-L)
OpenAlex
W2049923630
Cited by
35
References
37
Citations by year
2021: 1 · 2020: 1 · 2018: 1 · 2017: 2 · 2016: 3 · 2015: 1 · 2014: 3 · 2013: 1 · 2012: 2
FWCI
4.36
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Cardiovascular Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Nephrology › Chronic Kidney Disease and Diabetes
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Health Sciences › Medicine › Nephrology › Renal Diseases and Glomerulopathies
Keywords
tempol, superoxide dismutase mimetic, diabetic nephropathy, oxidative stress, NADPH oxidase, catalase, myeloperoxidase, hydrogen peroxide, hypochlorite, TGF-beta, mesangial expansion, proteinuria, streptozotocin-induced diabetes, superoxide
MeSH terms
Animals, Antioxidants, Cyclic N-Oxides, Diabetes Mellitus, Experimental, Diabetic Nephropathies, Female, Spin Labels, Superoxide Dismutase, Rats, Sprague-Dawley, Biomimetics, Rats

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