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Öğe Ameliorative effects of aminoguanidine on rat aorta in Streptozotocin-induced diabetes and evaluation of ?-SMA expression(Turkish Soc Cardiology, 2014) Elbe, Hulya; Vardi, Nigar; Orman, Dogan; Taslidere, Elif; Yildiz, AzibeObjective: Diabetes mellitus is one of the chronic metabolic diseases which is characterized by microvascular and macrovascular complications. This study was designed to investigate the improving the effects of amnioguanidine on aortic damage in a streptozotocin (STZ) induced diabetic rat model. Methods: Thirty-two male Sprague-Dawley rats divided into four groups as follows: Control, Aminoguanidine, Diabetes, and Diabetes+Aminoguanidine. Experimental diabetes was induced by single dose STZ (45 mg/kg) intraperitoneally. After administration of STZ, the DM+AMG group began to receive AMG (1 g/L) was prepared by dissolving in tap water during 10 weeks. At the end of the study, blood glucose levels were determined and rats were sacrified by ketamine anesthesia. Following routine tissue process, aortas were embedded in paraffin. Histochemical (H-E and Orcein) and immunohistochemical alpha-smooth muscle actin (alpha-SMA) stains were applied and the sections examined by light microscope. Statistical analysis was carried out using the SPSS 13.0 statistical program. Results: The rats in diabetes group had significantly higher blood glucose levels than the rats of control. The main histological alterations were detected in tunica media such as extensive thickening (414.32 +/- 9.62 mu m), irregular of elastic fibers and intensive alpha-SMA staining in diabetic rats. The thickness of tunica media was statistically increased in DM group, when compared with the control group (p<0.001). On the other hand, AMG prevented disorganization of elastic fibers and overexpression of alpha-SMA. The mean thickness of tunica media was decreased significantly in DM+AMG (319.16 +/- 6.53 mu m) compared with the DM group (p<0.001). Conclusion: Our results demonstrate that AMG treatment may protect the impairment of aort structure at histological level.Öğe Aminoguanidine mitigates apoptosis, testicular seminiferous tubules damage, and oxidative stress in streptozotocin-induced diabetic rats(Churchill Livingstone, 2015) Orman, Dogan; Vardi, Nigar; Ates, Burhan; Taslidere, Elif; Elbe, HulyaThis study aimed to investigate the effect of aminoguanidine (AG) against testicular damage streptozotocin (STZ) induced diabetes. Thirty two rats were separated into four groups: control, AG, STZ and STZ + AG. In the STZ group, 12.5 +/- 1.3% of tubules were seen as containing sloughed spermatogenic cells into the lumen, 28.7 +/- 1.8% of tubules were atrophic, 46.2 +/- 2.1% of tubules were degenerative and 8.5 +/- 0.9% of tubules contained giant cells. Statistically, the affected tubule number was significantly lower in the STZ + AG group than in the STZ group. Intensely stained caspase-3 cells showed a statistically significant increase in the STZ group, while it decreased in the STZ + AG group. The enzyme activities of catalase (CAT), superoxide dismutase (SOD) and glutathione (GSH) level decreased and the level of malondialdehyde (MDA) and nitric oxide (NO) increased in the STZ group, while AG treated diabetic rats showed an increase of CAT, SOD activity and GSH level and a decrease in MDA and NO levels. This study shows that the oxidative stress, increased NO level and apoptotic cell death play an important role in diabetic rat testicular damage and that AG treatment of diabetic rats results in protection of spermatogenic cells against oxidative stress and apoptotic cell death. (C) 2015 Elsevier Ltd. All rights reserved.Öğe Anti-Apoptotic Effects of Aminoguanidine Against Liver Damage on Experimental Diabetes in Rats(2014) Taşlıdere, Elif; Vardı, Nigar; Orman, Dogan; Elbe, HülyaAmaç:Bu çalışma, streptozotosin (STZ) ile oluşturulan diyabetik sıçan modelinde, karaciğerde ortaya çıkan histolojik değişiklikler üzerine aminoguanidinin antiapoptotik ve iyileştirici etkilerinin araştırılması amacıyla planlandı. Gereç ve Yöntemler: Çalışmada 32 adet Sprague Dawley erkek sıçan kullanıldı. Sıçanlar her biri 8 adetten oluşan 4 gruba ayrıldı. Kontrol, aminoguanidin (AMG), Streptozosin (STZ), Streptozosin+AMG (STZ+AMG). Deneysel diyabet STZ ve STZ+AMG gruplarında tek doz STZ'nin (45 mg/kg) intraperitoneal (i.p.) uygulanması ile oluşturuldu. Alınan dokular, rutin doku takip işlemlerinden geçirilerek parafine gömüldü. Parafin bloklardan alınan kesitlere histokimyasal (Mayer's Hemotoksilen-Eozin, PAS) ve immunohistokimyasal (kaspaz-3) boyama yöntemleri uygulandı. Boyanan kesitler ve Leica DFC-280 ışık mikroskobunda incelendi. Bulgular: Kontrol ve AMG grubu normal histolojik görünümdeydi. Bununla birlikte STZ grubunda parankima içerisinde inflamatuvar hücre içeren multifokal nodüller izlendi. Ayrıca sağlam hepatositler arasında yerleşmiş asidofil sitoplazmalı ve heterokromatik nükleuslu nekrotik hücrelere ve hemorajik alanlara rastlandı. Lobülün periferinde yer alan hepatositlerde glikojen kaybı gözlendi. Ayrıca kaspaz-3 boyama metodu uygulanan kesitlerde kaspaz-3 (+) boyanan hücre sayılarının STZ grubunda, kontrol grubuna göre anlamlı derecede arttığı tespit edildi. STZ uygulanan sıçanlara AMG verilmesiyle karaciğerde izlenen histolojik hasarın düzeldiği izlendi. Ayrıca kaspaz-3 (+) hücre sayılarının azaldığı tespit edildi. Sonuç: Kronik aminoguanidin uygulaması, STZ ile sıçanlarda oluşturulan diyabetin neden olduğu karaciğer hasarını azalttı. Sonuç olarak aminoguanidinin diyabetik karaciğer hasarının gelişimini önleyeceğini düşünmekteyizÖğe Anti-Apoptotic Effects of Aminoguanidine Against Liver Damage on Experimental Diabetes in Rats(İnönü Üniversitesi Tıp Fakültesi Dergisi, 2014) Taslidere, Elif; Vardi, Nigar; Orman, Dogan; Elbe, HulyaObjective: This study was designed to investigate the antiapoptotic and improving effects of aminoguanidine on the histological alterations in liver in streptozotocin (STZ)-induced diabetic rat model. Material and Methods: 32 male Sprague Dawley rats were divided into the following 4 groups: Control, Aminoguanidine (AMG), Streptozotocin (STZ), Streptozotocin + Aminoguanidine (STZ+AMG). The animals in group STZ and STZ+AMG were made diabetic by intraperitoneal injection of streptozotocin 45 mg/kg. Histochemical and immunohistochemical staining methods were applied to sections obtained from paraffin blocks and preparations were examined by using Leica DFC-280 light microscope. Results: The sections taken from the control and AMG groups were normal in histological appearance. However, multifocal nodules containing inflammatory cells were observed in the diabetic group. Moreover necrotic hepatocytes and hemorrhagic areas were observed among intact hepatocyte of lobul in the STZ group. Glycogen loss was observed in the hepatocytes localized at the periphery of lobule. In addition, the numbers of cells with positive staining by caspase-3 were significantly increased. On the other hand, it was seen that, in the groups administered with STZ, histological injury in the liver was attenuated by the administration of AMG. Moreover, it was found that the number of caspase-3 positive cells was significantly decreased in the STZ+AMG group. Conclusion: We concluded that chronic aminoguanidine administration reduced liver injury in STZ- induced diabetic rats. Thus, we suggest that aminoguanidine may be used to prevent the development of diabetic liver damage.
