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  • Küçük Resim
    Öğe
    The Effect of Picroside-2 on Erythrocyte Deformability and Lipid Peroxidation in StreptozotocinInduced Diabetic Rats Subjected to Left Anterior Descending Artery-Ischaemia Reperfusion
    (2017) Çomu, Faruk Metin; Polat, Yücel; Özer, Abdullah; Erer, Dilek; Kirişçi, Mehmet; Dursun, Ali Doğan; Tatar, Tolga
    Aim: Diabetes mellitus (DM) is a chronic metabolic disorder principally characterized by an elevation in oxidative stress levels. Ischaemia-reperfusion (IR) injury starts a cascade of events that lead to tissue ischaemia and cellular damage produced by reperfusion causing an inflammatory like response. Erythrocyte deformability and plasma viscosity are important clinical implications for organ and tissue perfusion. Recent studies have found that picroside-2 has antioxidant, neuroprotective and anti-inflamatory effects. The aim of our study was to investigate the effects of picroside-2 on erythrocyte deformability and lipid peroxidation in streptozotocin-induced diabetic rats subjected to left anterior descending (LAD) artery IR. Methods: The animals were randomly assigned to one of five experimental groups. In Group (control) C, DC (diabetes-control group), and DP (diabetespicroside-2 group) neither coronary artery occlusion nor reperfusion were performed in the control rats. In Group DIR, a branch of the LAD artery was occluded for 45 minutes followed by 90 minutes of reperfusion to produce IR. In Group DIRP, picroside-2 was administrated via 10 mg.kg-1 inraperitoneal (IP) route 30 minutes before ligating the LAD artery. Serum malondialdehyde and nitric oxide activities were investigated to document lipid peroxidation and erythrocyte deformability index. Results: Deformability index was notably increased in diabetic rats (p<0.0001). It was notably increased in Group DIR when compared to Group C, DC, DP and DIRP (p<0.0001, p=0.009, p=0.013, p=0.009, respectively). MDA level and NO activity were also higher in IR group than the other groups. Conclusion: Erythrocyte deformability index was decreased in rats with diabetes and IR injury. This injury may lead to further microcirculatory problems. Picroside 2 was shown to be useful in reducing the side effects of this kind of injury.
  • [ X ]
    Öğe
    Effects of Dexmedetomidine Administered Through Different Routes on Kidney Tissue in Rats with Spinal Cord Ischaemia–Reperfusion Injury
    (Dove Medical Press Ltd, 2022) Şengel, Necmiye; Köksal, Zeynep; Dursun, Ali Doğan; Arslan, Mustafa; Kavutçu, Mustafa; Kurtipek, Ömer; Sezen, Şaban Cem
    Background: Ischaemia–reperfusion (IR) injury, which can be encountered during surgical procedures involving the abdominal aorta, is a complex process that affects distant organs, such as the heart, liver, kidney, and lungs, as well as the lower extremities. In this study, we aimed to contribute to the limited literature by investigating the protective effect of dexmedetomidine, which was administered through different routes, on kidney tissue in rats with spinal cord IR injury. Methods: A total of 30 rats were randomly divided into five groups: control (C group), IR (IR group), IR-intraperitoneal dexmedetomidine (IRIPD group), IR-intrathecal dexmedetomidine (IRITD group), and IR-intravenous dexmedetomidine (IRIVD group). The spinal cord IR model was established. Dexmedetomidine was administered at doses of 100 µg/kg intraperitoneally, 3 µg/ kg intrathecally, and 9 µg/kg intravenously. Histopathologic parameters in kidney tissue samples taken at the end of the reperfusion period and biochemical parameters in serum were evaluated. Results: When examined histopathologically, tubular dilatation was found to be significantly reduced in the IRIVD, IRITD, and IRIPD groups compared with the IR group (p = 0.012, all). Vascular vacuolization and hypertrophy were significantly decreased in the IRIVD, IRITD, and IRIPD groups compared with the IR group (p = 0.006, all). Tubular cell degeneration and necrosis were significantly reduced in the IRIVD, IRITD, and IRIPD groups compared with the IR group (p = 0.008, p = 0.08, and p = 0.030, respectively). Lymphocyte infiltration was significantly decreased in the IRIVD and IRITD groups compared with the IR group (p = 0.006 and p = 0.06, respectively). Conclusion: It was observed that dexmedetomidine administered by different routes improved the damage caused by IR in kidney histopathology. We think that the renoprotective effects of dexmedetomidine administered intravenously and intrathecally before IR in rats are greater. © 2022 Şengel et al.
  • Küçük Resim
    Öğe
    Kısa dönem antrenmanın iskelet kasında kaveolin ve VEGF ekspresyonu üzerine etkisi
    (2013) Dursun, Ali Doğan; Fıçıcılar, Hakan; Baştuğ, Metin; Tekin, Demet
    Dayanıklılık egzersizi iskelet kası ve kardiyovasküler sistemde adaptif değişikliklere yol açmaktadır. Egzersiz anjiyogenezin önemli bir mediatörü olan vasküler endotelyal büyüme faktörünü (VEGF) indüklemektedir. Kaveolin-1 ve -3, kaveoller olarak bilinen hücre membran oluşumlarını oluşturan protein ünitelerdir ve kaveolin-reseptör-postreseptör etkileşimleri yoluyla sinyal iletiminin regülasyonunda aktif rol alırlar. Kaveolin-1in VEGF ile indüklenen sinyal kaskadında yer aldığı gösterilmiştir. Çalışmada kısa dönem egzersiz antrenmanının farklı lif kompozisyonlarından oluşan iskelet kaslarında VEGF ve kaveolin-1 ve -3 mRNA düzeyleri üzerindeki etkisinin incelenmesi amaçlanmıştır. Çalışmada 3-4 aylık Wistar Albino türü erkek sıçanlara 10 gün süreyle koşu bandına ve egzersize alıştırma programı uygulandı. Takiben denekler alıştırma (n6) ve antrenman grubu (n6) olarak ikiye ayrıldı. Antrenman grubu ratlara 3 günlük kısa dönem dayanıklılık antrenmanı yaptırıldı (20-25 metre/dakika, %10 eğim, 85 dakika/ gün). Koşu bandı deneylerine katılmayan ratlardan üçüncü deney grubu olarak kontrol grubu oluşturuldu (n6). Deneklerin gastroknemius (kırmızı ve beyaz kı- sımları), plantaris ve soleus kas örneklerinden elde edilen total RNAlarından ters-trankripsiyon PCR ile cDNA sentezlendi.VEGF_{164} ,VEGF_{188'} kaveolin-1, kaveolin-3 ve GAPDH PCR amplifikasyonunu takiben agaroz jel elektroforezi ve ardından UV kamera görüntülerinden bant yoğunluk analizleri yapıldı. Antrenman grubunda kontrol ve alıştırma gruplarına göre gastroknemius kası kırmızı kısımda VEGF_{164} mRNA düzeyinde artış olduğu gösterilmiştir (Kruskal Wallis Test: p0.033, posthoc Tukey HSD: kontrol vs antrenman p0.014, kontrol vs alıştırma p0.995, alıştırma vs antrenman p0.016). Kaveolin-1 ve -3 düzeylerinde değişiklik saptanmamıştır. VEGF_{164}mRNAsındaki artış anjiyogenik mekanizmaların tetiklendiğine işaret etmektedir. Anjiyogenik mekanizmalarda kaveolin-VEGF etkileşiminin anlaşılabilmesi için ek çalışmalar gerekmektedir.
  • Küçük Resim
    Öğe
    The Effect of Sevoflurane and Fullerenol C 60 on the Liver and Kidney in Lower Extremity Ischemia-Reperfusion Injury in Mice with Streptozocin-Induced Diabetes
    (Dove Medical Press Ltd, 2023) Sengel, Necmiye; Küçük, Ayşegül; Özdemir, Cağrı; Sezen, Şaban Cem; Kip, Gülay; Er, Fatma; Dursun, Ali Doğan
    Objective: This study aimed to demonstrate whether fullerenol C60, sevoflurane anesthesia, or a combination of both had protective effects on the liver and kidneys in lower extremity ischemia-reperfusion injury (IRI) in mice with streptozocin-induced diabetes. Methods: A total of 46 Swiss albino mice were divided into six groups as follows: control group (group C, n=7), diabetes group (group D, n=7), diabetes-ischemia/reperfusion (group DIR, n=8), diabetes-ischemia/reperfusion-fullerenol C60 (group DIR-FC60, n=8), diabetes-ischemia/reperfusion-sevoflurane (group DIR-S, n=8), and the diabetes-ischemia/reperfusion-fullerenol C60-sevoflurane (group DIR-S-FC60, n=8). Fullerenol C60 (100mg/kg) was administered intraperitoneally 30 min before the ischemia-reperfusion procedure to the fullerenol groups (DIR-FC60 and DIR-S-FC60). In the DIR groups, 2 hours (h) ischemia-2h reperfusion periods were performed. In the sevoflurane groups, sevoflurane was applied during the ischemia-reperfusion period with 100% O2. Liver and kidney tissues were removed at the end of the reperfusion procedure for biochemical and histopathological examinations.Results: In liver tissue, hydropic degeneration, sinusoidal dilatation, pycnotic nuclei, prenecrotic cells, and mononuclear cell infiltration in parenchyma were significantly more frequent in group DIR than in groups D and group C. In terms of the histopathologic criteria examined, more positive results were seen in group DIR-FC60, and when group DIR-FC60 was compared with group DIR, the difference was significant. The best results in AST, ALT, glucose, TBARS levels, and SOD enzyme activities in liver tissue were in group DIR-FC60 compared with group DIR, followed by groups DIR-S-FC60 and DIR-S, respectively. Regarding TBARS levels and SOD enzyme activities in kidney tissue, the best results were in groups DIR-FC60, DIR-S-FC60, and DIR-S, respectively.Conclusion: According to our findings, it is clear that fullerenol C60 administered intraperitoneally 30 min before ischemia, alone or together with sevoflurane, reduces oxidative stress in distant organ damage caused by lower extremity IRI, and reduces liver and kidney tissue damage in histopathologic examinations.