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Öğe The effect of dexmedetomidine on myocardial ischemia reperfusion injury in streptozotocin induced diabetic rats(Anaesthesia Pain & Intensive Care, 2015) Arslan, Mustafa; Poyraz, Fatih; Kiraz, Hasan Ali; Alkan, Metin; Kip, Gülay; Erdem, Özlem; Çomu, Faruk MetinObjective: Ischemia/reperfusion (I/R) injury is an important cause of myocardial damage by means of oxidative, inflammatory, and apoptotic mechanisms. The aim of the present study was to examine the potential cardio-protective effects of dexmedetomidine in a diabetic rat model of myocardial I/R injury. Methodology: A total of 18 streptozotocin (55 mg/kg) induced diabetic Wistar Albino rats were randomly divided into three equal groups as follows: the diabetic I/R group (DIR) in which myocardial I/R was induced by ligating the left anterior descending (LAD) coronary artery for 30 min, followed by 2 hours of reperfusion following left thoracotomy, the diabetic I/R dexmedetomidine group (DIRD) which were given 100 mu g/kg dexmedetomidine intraperitoneally 30 min before I/R induction by the same method and the diabetic control group (DC) which underwent sham operations without tightening of the coronary sutures. As a control group (C), 6 healthy age-matched Wistar Albino rats underwent sham operations similar to DC group. After the operation the rats were sacrificied and the myocardial tissues were histopathologically examined. Results: Microscopic myonecrosis findings were significantly different among groups (p= 0.008). Myonecrosis findings were significantly higher in DIR compared to C, DC and DIRD groups (p= 0.001, p=0.007 and p=0.037 respectively). Similarly microscopic inflammatory cell infiltration degrees showed significant differences among groups (p<0.0001). Compared to C, DC and DIRD groups, the microscopic inflammatory cell infiltration was significantly higher among DIR group (p<0.0001, p<0.0001 and p=0.009 respectively). Also myocardial tissue edema was significantly different among groups (p=0.002). The microscopic myocardial tissue edema levels were significantly higher in DIR group than C and DIRD groups (p<0.0001 and p=0.022 respectively). Tissue edema was also more prominent in DC compared to C group (p=0.022) Conclusion: Taken together our data indicate that dexmedetomidine may be helpful in reducing myocardial necrosis, myocardial inflammation and myocardial tissue edema resulting from ischemia/reperfusion injury.Öğe Effect of Fullerenol C60 on Erythrocyte Deformability During Ischaemia-Reperfusion Injury of Lower Extremity in Diabetic Rats(Gazi Univ, Fac Med, 2019) Kip, Gülay; Kartal, Hakan; Çomu, Faruk Metin; Polat, Yücel; Arslan, Mustafa; Küçük, AyşegülBackground: Fullerenol, a water-soluble C60-fullerene derivative synthesized by Chiang et al, has been demonstrated to be able to scavenge free radicals in vitro and in vivo. Although its protective effects have been already studied and shown in ischemia reperfusion (IR) injury, additional investigation is necessary for its effect on erythrocyte deformability. The purpose of our study was to look into the effects of fullerenol C60 on erythrocyte deformability in rat lower extremity ischemia reperfusion injury model. Materials and Methods: After approval of the Ethics Committee, 30 Wistar Albino rat were divided into 5 groups (n:6) as; Control (C), Diabetes (group D), diabetes+ fullerenol C60 group (DF), diabetes+ IR (group DIR) and diabetes IR+ fullerenol C60 (DIRF). 55 mg/kg streptozotocin was administered to the rats for diabetes. After the period of 72 hour, blood glucose concentration was mesured, 250 mg/dl and above were considered as diabetic rat. Four week after the formation of diabetes, rats were subjected to 2 hour ischemia and 2 hour reperfusion. Erythrocyte packs were prepared from heparinized blood samples and deformability measurements were performed. Results: The deformability index was significantly increased in diabetic rats; however, it was similar in group D, DF and DIRF. It was significantly increased in group DIR when compared to group C, D, DF and DIRF. The relative resistance was increased in I/R models. Conclusion: This study aimed to investigate the effects of IR on erythrocyte deformability which may lead to disturbance in blood flow and hence tissue perfusion in infrarenal rat aorta. We found that fullerenol C60 had beneficial effects by reversing undesirable effects of IR. In our opinion, further studies with larger volume are required to support our promising results.Öğe Effect of Low and High Dose Sugammadex on Erythrocyte Deformability in Streptozotocin- Induced Diabetic Rats(2015) Kiraz, Hasan Ali; Turgut, Hüseyin Cihad; Kartal, Seyfi; Çomu, Faruk Metin; Kip, Gülay; Alkan, Metin; Aydın, Muhammed EnesAmaç: Eritrosit deformabilitesi eritrosit membranının özel yapısı ile ilgili bir fonksiyon olup, hücrenin dağılmadan oksijen taşımasına olanak sağlar. Diyabette görülen bozulmuş eritrosit deformabilitesi eritrosit agregasyonu ve mikrovasküler düzeydeki dolaşım bozukluğunun etkenlerinden biridir. Bu çalışmada sıçanlarda streptozosinle indüklenen diyabette yüksek ve düşük doz sugammadeksin eritrosit deformabilitesi üzerindeki etkisini araştırmayı amaçladık. Yöntemler: Ağırlıkları 225-300 gram arasında değişen 24 erkek Wistar albino sıçan rasgele 4 gruba ayrıldı. Grup K (kontrol; n=6), Grup DK (diyabet kontrol; n=6), Grup DR-16S (diyabet-rokuronyum-16mg sugamadeks; n=6) ve Grup DR96S (diyabet- rokuronyum-96mg sugammadeks; n=6). Kontrol ve diyabet gruplarındaki sıçanlara aynı hacimde %0.9 NaCl verildi. Diyabet oluşturmak için tek intraperitoneal enjeksiyonla 55 mg.kg-1 streptozosin (Sigma Chemical, St. Louis, MO, USA) uygulandı. Hayvanlar 30 gün süre ile izlendi ve takip süresinin sonunda kan örneklerinden eritrosit deformabilitesi ölçümü yapıldı. Bulgular: Kontrol grubundaki serum glukoz düzeyi DK, DR-16S ve DR-96S gruplarındakilerden anlamlı olarak düşük bulundu (p<0.0001). Diyabet oluşturulan sıçanlarda deformabilite indeksi anlamlı düzeyde yüksek bulundu (p<0.0001). Eritrosit deformabilitesi DR-96S grubunda Kontrol ve DK gruplarındakinden anlamlı olarak yüksek bulundu (p<0.0001 ve p=0.028). Sonuç: Bu çalışmada diyabetik sıçanlarda düşük doz sugammadeksin güvenli olduğunu gösterdik. Çalışmamazın sonuçları sugammadeksin eritrosit deformabilitesi ve mikro/makrosirkülasyon üzerindeki etkilerini araştıracak insan ve hayvan çalışmaları için yol gösterici olabilirÖğe Effects of esmolol on lung injury induced by lower extremity Ischemia-reperfusion(Bayrakol Medical Publisher, 2022) Sabuncu, Ülkü; Sezen, Şaban Cem; Küçük, Ayşegül; Salman, Nevriye; Sabuncu, Timucin; Kip, Gülay; Kurtipek, ÖmerAim: After hind limb ischemia-reperfusion (I/R), impairments in remote organs are frequent. Lung tissue is the organ most affected by the remote organ damage. The lung damage increases ventilatory support, the need for inotropic agents and mortality. Many drugs and methods have been used in attempts to prevent or reduce this damage. The aim of this study is to investigate the protective effects of esmolol infusion on lung tissue prior to I/R created in the lower extremity. Material and Methods: The study was performed between 11 and 14 April 2018 in Gazi University Experimental Animal Research Center, Ankara, Turkey. After obtaining ethics committee approval, 24 rats were randomly divided into 4 groups: Control (Group C), Esmolol (Group E), Ischemia-reperfusion (Group I/R), and I/R-Esmolol (Group I/RE). Esmolol (200 mu g/kg/min intravenous) was applied 30 minutes before the procedure. The biochemical and histopathological parameters of lung tissue samples were compared. Results: Neutrophil infiltration/aggregation, alveolar wall thickness, and total lung injury scores were significantly higher in the I/R group than in the C and E groups. In addition, neutrophil infiltration/aggregation, alveolar wall thickness, and total lung injury scores in the I/R group were statistically higher than in the I/R-E group (p=0.030, p=0.010, p=0.001, respectively). Malondialdehyde levels, catalase (CAT) and paraoxonase (PON) enzyme activities in the I/R group were significantly higher than in the C, E, and I/R-E groups. Glutathione S- transferase ( GSH) enzyme activity was similar in all groups. Discussion: It was found that esmolol infusion at 200 mu g/kg/min intravenously-reduced oxidative stress when administered 30 minutes before ischemia in rats and partially corrected the damage caused by I/R in lung histopathology.
