title: Posttreatment with aminoguanidine attenuates renal ischemia/reperfusion injury in rats.
abstract: Acute renal failure secondary to ischemia/reperfusion (I/R) injury is associated with significant mortality and morbidity. Aminoguanidine (AG), an inducible nitric oxide synthase inhibitor with antioxidant properties, has been reported beneficial in renal I/R injury. The aim of the present study was to investigate the effect of AG on renal I/R injury and compare the effectiveness of different AG treatment modalities. Sprague-Dawley rats were randomly assigned to one of four groups. The control group (n = 6) received sham operation. The I/R group (n = 6), AG-I group (n = 8), and AG-II group (n = 8) received bilateral renal ischemia for 45 min followed by 24 hours of reperfusion. The AG-I group received AG (50 mg/kg) intraperitoneally four hours and 10 minutes before the induction of ischemia. The AG-II group received AG (50 mg/kg) intraperitoneally four hours and 10 minutes after the initiation of reperfusion. Serum urea and creatinine levels increased significantly in the I/R and AG-I groups compared to the control group. Kidney samples from rats in the I/R and AG-I groups revealed severe tubular damage at histopathological examination. Posttreatment with AG significantly reduced serum urea and creatinine levels and improved histopathological lesions compared with the I/R group. Although pretreatment with AG failed to protect kidneys against I/R injury in this experimental model, posttreatment with AG attenuated renal dysfunction and histopathological changes after I/R injury.
authors.affiliation: Department of Internal Medicine, Gulhane Military Medical Academy, Haydarpasa Teaching Hospital, Uskudar, Istanbul, Turkey. yalonem@yahoo.com
authors.forename: Yalcin
authors.initials: Y
authors.lastname: Onem
authors.forename: Osman Metin
authors.initials: OM
authors.lastname: Ipcioglu
authors.forename: Aptullah
authors.initials: A
authors.lastname: Haholu
authors.forename: Huseyin
authors.initials: H
authors.lastname: Sen
authors.forename: Secil
authors.initials: S
authors.lastname: Aydinoz
authors.forename: Selami
authors.initials: S
authors.lastname: Suleymanoglu
authors.forename: Oguz
authors.initials: O
authors.lastname: Bilgi
authors.forename: Ilker
authors.initials: I
authors.lastname: Akyol
mesh_terms: D058186:Acute Kidney Injury / Q000209:etiology / Q000473:pathology / Q000517:prevention & control*; D000818:Animals; D001806:Blood Urea Nitrogen; D004334:Drug Administration Schedule; D004791:Enzyme Inhibitors / Q000008:administration & dosage / Q000627:therapeutic use*; D006146:Guanidines / Q000008:administration & dosage / Q000627:therapeutic use*; D008297:Male; D052247:Nitric Oxide Synthase Type II / Q000037:antagonists & inhibitors; D018384:Oxidative Stress; D051381:Rats; D017207:Rats, Sprague-Dawley; D015427:Reperfusion Injury / Q000150:complications / Q000188:drug therapy* / Q000473:pathology
chemical_list: D004791:Enzyme Inhibitors; D006146:Guanidines; D052247:Nitric Oxide Synthase Type II; C004479:pimagedine