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Öğe Effects of Aloe vera leaf gel extract on rat peritonitis model(Wolters Kluwer Medknow Publications, 2014) Altincik, Ayca; Sonmez, Ferah; Yenisey, Cigdem; Duman, Soner; Can, Ayse; Akev, Nuriye; Kirdar, Sevin; Sezak, MuratObjectives: The aim of this study was to investigate the antibacterial, anti-inflammatory, and antioxidant activities and probable toxic effects of Aloe vera (AV) in a rat peritonitis model. Materials and Methods: Rats were divided into five groups: (1) Control group, (2) AV group, (3) peritonitis group (P), (4) peritonitis + AV group (P + AV), and (5) peritonitis + antibiotherapy group (P + Ab). Ultrafiltration (UF) rates were determined and colony and leukocyte counts were calculated in the dialysate. Glucose, blood urea nitrogen (BUN), creatinine levels, and alanine transaminase (ALT) activities were studied in blood. Glucose, interleukins (IL-1 beta, IL-6), and prostaglandin E2 (PGE2) were studied in dialysate and peritoneal tissue for the assessment of the anti-inflammatory effect. Copper/zinc superoxide dismutase (Cu, Zn-SOD), malondialdehyde (MDA), and nitric oxide (NO) were also investigated in peritoneal tissue. Results: Aloe vera increased the UF rate and lowered leukocyte numbers in the peritonitis group. There was no significant difference in blood and dialysate glucose, BUN, creatinine levels and ALT activity among control and AV groups. AV decreased IL-1 beta, IL-6 and PGE2 in peritonitis, showing good anti-inflammatory effect. AV showed antioxidant effect on the chosen antioxidant parameters Cu, Zn-SOD, MDA, and NO. Conclusion: It was concluded that, AV might be used in peritonitis for its probable UF increasing, anti-inflammatory, and antioxidant effects.Öğe Efficacy of simvastatin in reducing postoperative adhesions after thyroidectomy: an experimental study(Acta Medical Belgica, 2017) Makay, Ozer; Isik, Dilek; Erol, Varlik; Yenisey, Cigdem; Kose, Timur; Icoz, Gokhan; Ertan, Yesim; Ozutemiz, Omer; Akyildiz, MahirBackground: We aimed to investigate whether simvastatin had any impact on the prevention of adhesion formation after thyroidectomy in a rat model. Methods: This study was performed in 66 Wistar albino rats randomized into three experimental groups. A right hemithyroidectomy was carried out in all the rats. Simvastatin was administered locally at a dose of 0.5 mg/kg and 0.8 mg/kg. Control rats received a saline solution only. Changes during the 1st week, 1st month and 3rd month were evaluated. Efficacy of the treatment was assessed by using a scoring system. Results: The severity of adhesions in low-dose simvastatin group was significantly less than the control and high-dose groups during the 1st and 3rd month (p <. 05). In addition, adhesions were less in the high dose group during the 3rd month, when compared to the control group (p <. 05). Moreover, fibrosis and fibroblast scores, which represent adhesions, were significantly lower in low-dose and high-dose groups at 3rd month, compared to controls (p <. 05). Conclusions: We investigated the influence of simvastatin application on post-thyroidectomy adhesion formation in rats. Whether adhesions, causing technical difficulties during neck redo surgery, can be reduced by the use of simvastatin in human, needs to be studied.Öğe The Interaction of Oxidative Stress Response with Cytokines in the Thyrotoxic Rat: Is There a Link?(Hindawi Publishing Corporation, 2009) Makay, Balahan; Makay, Ozer; Yenisey, Cigdem; Icoz, Gokhan; Ozgen, Gokhan; Unsal, Erbil; Akyildiz, Mahir; Yetkin, EnisOxidative stress is regarded as a pathogenic factor in hyperthyroidism. Our purpose was to determine the relationship between the oxidative stress and the inflammatory cytokines and to investigate how melatonin affects oxidative damage and cytokine response in thyrotoxic rats. Twenty-one rats were divided into three groups. Group A served as negative controls. Group B had untreated thyrotoxicosis, and Group C received melatonin. Serum malondialdehyde (MDA), glutathione (GSH), glutathione reductase (GR), glutathione peroxidase (GPx), and nitric oxide derivates (NO(center dot)x), and plasma IL-6, IL-10, and TNF-alpha were measured. MDA, GSH, NO(center dot)x, IL-10, and TNF-alpha levels increased after L-thyroxine induction. An inhibition of triiodothyronine and thyroxine was detected, as a result of melatonin administration. MDA, GSH, and NO(center dot)x levels were also affected by melatonin. Lowest TNFalpha levels were observed in Group C. This study demonstrates that oxidative stress is related to cytokine response in the thyrotoxic rat. Melatonin treatment suppresses the hyperthyroidism-induced oxidative damage as well as TNF-alpha response. Copyright (C) 2009 Balahan Makay et al.Öğe Omega-3 fatty acids inhibit oxidative stress in a rat model of liver regeneration(Korean Surgical Society, 2017) Firat, Ozgur; Makay, Ozer; Yeniay, Levent; Gokce, Goksel; Yenisey, Cigdem; Coker, AhmetPurpose: Lipid peroxidation and consequent reactive oxygen species in the setting of oxidative stress have crucial roles in liver regeneration, which may adversely affect the regeneration itself and lead to liver failure. The aim of the current study is to investigate whether omega-3 fatty acid supplementation inhibits oxidative stress in an experimental model of liver regeneration. Methods: Forty rats were allocated to four groups. Rats in group A received a sham operation. Rats in group B were subjected to right portal vein ligation (RPVL) and saline infusion. Rats in groups C and D were subjected to RPVL and total parenteral nutrition (TPN) with an all-in-one admixture containing a soybean oil based lipid emulsion. Rats in group D were additionally supplemented with omega-3 fatty acid infusion. Oxidative stresses in the blood and liver were measured by glutathione, superoxide dismutase, catalase, glutathione peroxidase, malondialdehyde, and nitric oxide. Results: Omega-3 supplementation to the TPN solution significantly corrected alterations in the blood and tissue concentrations of oxidants and anti-oxidants during regeneration (P < 0.05). Conclusion: Omega-3 fatty acid supplementation to the TPN solution revealed promising results in removal of oxidative stress that emerges during liver regeneration.Öğe Role of allopurinol on oxidative stress in caustic burn: cure for stricture?(Springer, 2007) Makay, Ozer; Yukselen, Vahit; Vardar, Enver; Yenisey, Cigdem; Bicakci, Tuncay; Ersin, Sinan; Ozutemiz, OmerAn experimental study was conducted to investigate the effects of allopurinol, which inhibits the enzyme xanthine oxidase, on oxidative stress and on the prevention of stricture development after esophageal caustic injuries in rat. A randomized controlled study was conducted and 60 Wistar albino rats were divided into 6 equal groups, three groups for the acute phase and 3 groups for the chronic phase. Caustic esophageal burn was created by application of 37.5% NaOH to the distal esophagus. Allopurinol was administered at 40 mg/kg daily. Efficacy of the treatment for the acute phase was assessed by measuring tissue malondialdehyde (MDA), nitric oxide (NO) and glutathione (GSH) at the 3rd day; and for the chronic phase by determining tissue hydroxyproline content and histopathologic damage score at the 28th day. We found an increase in XO, MDA and GSH levels and a decrease in NO levels in the acute phase. Allopurinol reinstated the increase in XO significantly, while MDA, GSH and NO levels were reinstated insignificantly. There was no significant difference in means of tissue hydroxyproline content. Histopathologic damage scores were significantly lower in the allopurinol treated group. This study, which is to our knowledge, the first in the literature investigating the influence of allopurinol on caustic esophageal burn, reveals that allopurinol effects MDA, GSH and NO levels insignificantly in the acute phase of caustic esophageal burn and decreases fibrosis significantly in the chronic phase.Öğe The role of N terminal pro-brain natriuretic peptide in the evaluation of left ventricular diastolic dysfunction: correlation with echocardiographic indexes in hypertensive patients(Springer, 2008) Ceyhan, Ceyhun; Unal, Selim; Yenisey, Cigdem; Tekten, Tarkan; Ceyhan, F. Banu OzturkThe utility of N-Terminal pro Brain Natriuretic Peptide (NT-proBNP) and Brain Natriuretic Peptide (BNP) for detecting left ventricular (LV) diastolic dysfunction in hypertensive patients without heart failure symptoms is unclear. In this study, we investigated the relation between NT-proBNP plasma levels and LV diastolic dysfunction in hypertensive patients without systolic dysfunction. Method: We studied 40 ambulatory patients (26 women, mean age 52 +/- 5) with controlled hypertension. LV diastolic function was assessed with conventional Doppler, by means of mitral inflow and with tissue Doppler echocardiography by means of mitral annulus. The ratio of early diastolic transmitral E wave velocities to tissue Doppler mitral annulus early diastolic E' wave velocities (E/E'), was used to detect LV filling pressures. Patients were divided in three groups according to E/E' ratios < 10 (group I), E/E' ratios ''between'' 10 and 15 (group II) and E/E' ratios > 15 (group III). Plasma concentrations of NT-proBNP were measured by electro chemiluminescence's immunoassay. Results: The NT-proBNP blood levels were positively correlated significantly with E/E' ratio (r = 0.80, P = 0.0001). Patients with elevated LV end diastolic pressure (LVEDP), defined as E/E' < 15 (n = 8) had highest NT-proBNP (203 +/- 75 pg/ml) levels. E/E' 10 to 15 group (n = 16) had a mean NT-proBNP level of 71 +/- 26 pg/ml, and those with E/E' < 10 (n = 16) had 39 +/- 20 pg/ml. A NT-proBNP value of 119 pg/ml had a sensitivity of 87%, a specificity of 100% for predicting E/E' > 15. Conclusion: The assessment of the blood concentration of NT-proBNP is of potential value for identification of those patients with hypertension to detect early cardiovascular changes, especially LV diastolic dysfunction.Öğe Use of activated protein C has no avail in the early phase of acute pancreatitis(Elsevier Sci Ltd, 2008) Akay, Sinan; Ozutemiz, Omer; Yenisey, Cigdem; Simsek, Nilufer Genc; Yuce, Gul; Batur, YucelObjectives. Sepsis and acute pancreatitis have similar pathogenetic mechanisms that have been implicated in the progression of multiple organ failure. Drotrecogin alfa, an analogue of endogenous protein C, reduces mortality in clinical sepsis. Our objective was to evaluate the early therapeutic effects of activated protein C (APC) in a rat model of acute necrotizing pancreatitis. Subjects and method. Acute necrotizing pancreatitis was induced by intraductal injection of 5% Na taurocholate. Hourly bolus injections of saline or recombinant human APC (drotrecogin alfa) was commenced via femoral venous catheter four hours after the induction of acute pancreatitis. The experiment was terminated nine hours after pancratitis induction. Animals in group one (n = 20) had a sham operation while animals in group two (n = 20) received saline and animals in group three (n = 20) received drotrecogin alfa boluses after acute pancreatitis induction. Pancreatic tissue for histopathologic scores and myeloperoxidase, glutathione reductase, glutathione peroxidase, and catalase activites were collected, and blood for serum amylase, urea, creatinine, and inleukin-6 measurements was withdrawn. Results. Serum amylase activity was significantly lower in the APC treated group than the untreated group (17,435 +/- 432 U/L vs. 27,4269 +/- 18 U/L, respectively). While the serum interleukin-6 concentration in the APC untreated group was significantly lower than the treated group (970 +/- 323 pg/mL vs. 330 +/- 368 pg/mL, respectively). Conclusion. In the early phase of acute pancreatitis, drotrecogin alfa treatment did not result in a significant improvement in oxidative and inflammatory parameters or renal functions.
