The effect of aminoguanidine on the kidney of diabetic albino Balb/c mice

Year 2012, Volume: 71 Issue: 1, 17 - 29, 05.10.2012

Ebru Gurel Nadim Yilmazer Cihan Demirci-tansel

Abstract

The aim of this study is to find out how activated inducible nitric oxide synthase (iNOS) and nitric oxide (NO) affect kidney tissue in streptozotocin (STZ)-induced diabetic mice and whether its influence can be prevented by aminoguanidine (AG), a specific iNOS inhibitor. Twenty-four male mice were divided into four study groups (n=6) receiving a daily dose of 100 mg.kg-1 AG for 90 days (Group AG), a single dose of 150 mg.kg-1 STZ (Group STZ), a single dose of 150 mg.kg-1 STZ followed by daily administration of 100 mg.kg-1 AG for 90 days (Group STZ-AG), and intraperitoneally injections of saline only (Group Control) for 90 days. Dispersion of NADPH-diaphorase (NADPH-d) was stronger in the kidney sections of STZ-treated animals compared with the controls. STZ treatment caused disruption of continuity of the brush borders in proximal tubules, glomerular endothelial damage, and considerable renin granules in the juxtaglomerular cells. AG administration following STZ treatment partly prevented histological and cytological changes in kidney cortex, and renin dispersion was similar to that in control animals. We found that increased inducible nitric oxide (iNO) caused kidney tissue degeneration that could be prevented to some extent by AG treatment. There is a possible relationship between increased iNOS and dispersion of renin granules in juxtaglomerular cells in diabetes.

Keywords

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Diyabetik albino Balb/c farelerde aminoguanidinin böbrek üzerindeki etkisi

Abstract

Bu çalışmanın amacı, uyarılabilir nitrik oksit sentaz (iNOS) aktivasyonunun ve nitrik oksidin streptozotosin (STZ) ile uyarılmış diyabetik farelerde böbrek dokusunu nasıl etkilediğini ve etkisinin spesifik bir iNOS inhibitörü olan aminoguanidin (AG) ile önlenip önlenemediğini öğrenmektir. Yirmi dört erkek fare, 90 gün boyunca günlük 100 mg.kg-1 AG (AG Grubu), tek doz 150 mg.kg-1 STZ (STZ Grubu), tek doz 150 mg.kg-1STZ’yi takiben 90 gün boyunca günlük 100 mg.kg-1 AG (STZ-AG Grubu) ve sadece intraperitonal fizyolojik tuzlu su (Kontrol Grubu) alan dört gruba ayrılmıştır. NADPH-diaforez (NADPH-d) dağılımı, STZ uygulanmış hayvanların böbrek kesitlerinde kontrolle karşılaştırıldığında daha fazlaydı. STZ uygulaması proksimal tübüllerde fırça kenarların devamlılığının bozulmasına, glomerulus endotelinde hasara ve jukstaglomerular hücrelerde renin granüllerinin daha fazla olmasına yol açmıştır. STZ uygulamasını takiben verilen AG, böbrek korteksindeki histolojik ve sitolojik değişiklikleri kısmen önlemiştir ve renin dağılımı kontrol hayvanlardakine benzer şekilde olmuştur. Uyarılabilir nitrik oksit (iNO) artışıyla böbrekte meydana gelen bozulmanın AG uygulamasıyla kısmen önlenebildiği bulunmuştur. Diyabette, artan iNOS ile jukstaglomerular hücrelerde renin granülleri dağılımı arasında olası bir ilişki vardır.

Keywords

Nitrik Oksit Sentaz (NOS), Böbrek, Aminoguanidin, Diabetes mellitus

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