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Öğe Brain tissue biochemical parameters in cerebral ischemic reperfusion injury after hemorrhagic shock: An experimental study(UNIVERSITATSVERLAG ULM GMBH, 2007) Cosar, Murat; Eser, Olcay; Fidan, Hueseyin; Kalkan, Erdal; Buyukbas, Sadik; Ozen, O. A.Objective: In this study, we showed the tissue biochemical parameters in cerebral ischemic reperfusion injury that developed after hemorrhagic shock in a rat model. Materials and Methods: Hemorrhagic shock models were established in 36 adult Sprague-Dawley rats and divided into six groups: control (group A), hemorrhagic shock (HS) (group B), first hour ischemic reperfusion (IR+1h) (group Q, 311 hour IR (IR+3h) (group D), 61(th) hour IR (IR+6h) (group E) and 2411 hour IR (IR+24h) (group F). The rats were sacrificed by bleeding from the intracardiac area after finishing the experiment. The brains were removed from the skull immediately. Bilateral hemispheres were dissected for biochemical analyses, and activities of superoxide dismutase (SOD) and myeloperoxidase (MPO), and the levels of malondialdehyde (MDA) were evaluated. Results: The study revealed that the SOD activities decreased stepwise from group A (control) to group F (IR+24h) (P<0.05). In addition, MDA levels and MPO activities increased stepwise from group A (control) to group F (IR+24h). Conclusion: We think that the level of cell injury increases stepwise in the first, 3(rd), 6(th) and 24(th) hours after ischemia reperfusion injury.Öğe Combination therapy of Nigella sativa and human parathyroid hormone on bone mass, biomechanical behavior and structure in streptozotocin-induced diabetic rats(ELSEVIER GMBH, URBAN & FISCHER VERLAG, 2007) Altan, Mehmet Fatih; Kanter, Mehmet; Donmez, Senayi; Kartal, Murat Emre; Buyukbas, SadikExtracts of the seeds of Nigella sativa (NS), an annual herbaceous plant of the Ranunculaceae family, have been used for many years for therapeutic purposes, including their potential anti-diabetic properties. The aim of the present study was to test the hypothesis that combined treatment with NS and human parathyroid hormone (hPTH) is more effective than treatment with NS or hPTH atone in improving bone mass, connectivity, biomechanical behaviour and strength in insulin-dependent diabetic rats. Diabetes was induced by intraperitoneal injection of streptozotocin (STZ) at a single dose of 50mg/kg. The diabetic rats received NS (2 ml/kg/day, i.p.), hPTH (6 mu g/kg/clay, i.p.) or NS and hPTH combined for 4 weeks, starting 8 weeks after STZ injection. The beta-cells of the pancreatic islets of Langerhans were examined by immunohistochemical methods. In addition, bone sections of femora were processed for histomorphometry and biomechanical. analysis. In diabetic rats, the beta-cells were essentially negative for insltin-immunoreactivity. NS treatment (alone or in combination with hPTH) significantly increased the area of insulin immunoreactive beta-cells in diabetic rats; however, hPTH treatment atone only led to a slightly increase in the insulin-immunoreactivity. These results suggest that NS might be used in a similar manner to insulin as a safe and effective therapy for diabetes and might be useful in the treatment of diabetic osteopenia. (c) 2007 Elsevier GmbH. All rights reserved.Öğe A comparison of the effects of aggressive dose and conventional dose atorvastatin applications on IL-6 and NO levels in patients with acute myocardial infarction(ACADEMIC JOURNALS, 2011) Basarali, Mustafa Kemal; Buyukbas, Sadik; Yazar, Hayrullah; Kiyici, Aysel; Kayrak, Mehmet; Ulgen, SiddikHigh dose statin medication in acute coronary syndrome cases is a therapy which lowers mortality and morbidity rates. Interleukin-6 (IL-6) is produced in higher amounts in acute myocardial infarction (MI) and facilitates myocardial damage. However, secretion of nitric oxide (NO) is depleted. We aimed to compare the effects of conventional dose (10-40 mg/day) and aggressive dose (80 mg/day) atorvastatin medications on IL-6 and NO levels in patients with primary percutaneous transluminal coronary angioplasty (PTCA) intervention after acute MI. 50 patients (8 females, 42 males) with the diagnosis of acute MI with ST segment elevation enrolled to the study. Primary PTCA intervention was performed on these patients and consequently either conventional dose (10 to 40 mg/day) or aggressive dose (80 mg/day) atorvastatin medications were given to the patients. Three months later, plasma IL-6 and NO levels were determined and alterations in the groups were evaluated. IL-6 levels decreased from 24.34 +/- 12.04 to 11.40 +/- 5.79 pg/ml and from 29.62 +/- 17.38 to 12.51 +/- 8.95 pg/ml in conventional dose and aggressive dose regimens respectively (p<0.001). However, NO concentrations increased from 22.90 +/- 8.24 to 31.70 +/- 7.56 mu M in conventional dose and from 19.37 +/- 5.60 mu M to 34.15 +/- 9.60 mu M in aggressive dose groups (p < 0.001). The effects of aggressive dose atorvastatin medication on IL-6 and NO levels were similar to conventional dose application in cases with ST segment elevation acute MI.Öğe The effect of aprotinin on brain ischemic-reperfusion injury after hemorrhagic shock in rats: An experimental study(LIPPINCOTT WILLIAMS & WILKINS, 2007) Eser, Cay; Kalkan, Erdal; Cosar, Murat; Buyukbas, Sadik; Avunduk, Mustafa Cihat; Aslan, Adem; Kocabas, VolkanBackground. We aimed to demonstrate the positive effects of the serine protease inhibitor aprotinin on neural ischemia-reperfusion injury and apoptosis in a rat model. Methods: There were 18 rats divided into 3 groups: group A (sham, n = 6), group B (ischemia-reperfusion, n = 6), and group C (ischemia-reperfusion + aprotinin, n = 6). The systolic blood pressure of the group B and C rats was decreased to 40% to 50% of the normal level by taking blood from the femoral vein to develop hemorrhagic shock. The blood was retained and given to the remaining group B and C rats for reperfusion 20 minutes after the procedure. In group B, isotonic solution and, in group C, aprotinin was administered to the rats 5 minutes before reperfusion. After the rats were killed, the brain tissue samples were fixed for histopathologic examination. Brain tissue superoxide dismutase, malondialdehyde, and tissue myeloperoxidase level and apoptotic cell analyses were performed in all groups. Results: Superoxide dismutase level decreased from group A to group B and increased from group B to group C (p < 0.05). Malondialdehyde and myeloperoxidase levels and apoptotic cells increased from group A to group B and decreased from group B to group C (p < 0.05). Conclusions: The results suggest that the systemic use of aprotinin in ischemic neural tissue prevents reperfusion injury and also protects the morphologic, functional, and biochemical integrity of the neural tissue.Öğe The effect of theophylline on oxidative stress in serum and tissues in mechanical ventilation-induced diaphragm dysfunction(TURKISH BIOCHEM SOC, 2011) Uzun, Kursat; Aydin, Nihal Bakirkalay; Teke, Turgut; Buyukbas, Sadik; Basarali, KemalIntroduction: The role of oxidative stress in mechanical ventilation induced diaphragm dysfunction (VIDD) was shown in various studies. In this animal model, we planned to evaluate the role of diaphragmatic and systemic stress on VIDD and the effect of theophylline application on the oxidative stress. Material and methods: Thirty healthy male Sprague-Dawley rats were used. They were evenly divided into 3 groups as Group 1, control group (no application); group 2, placebo group receiving mechanical ventilation (MV); Group 3, theophylline group receiving both MV and theophylline. Malondialdehyde (MDA) and nitric oxide (NO) levels with xanthine oxidase (XO) and superoxide dismutase (SOD) activities were measured in all groups to evaluate the oxidative stress at diaphragm, lung tissue and plasma. Results: SOD (0.01-0.07 U/mg) and XO (0.61-1.76 U/g) activities with NO (0.05-0.14 mu mol/g) levels at diaphragm; XO (0.36-2.26 U/g) activity at lungs and SOD (2.06-5.24 U/mL) and XO (7.76-14.04 U/mL) activities with MDA (0.35-1.09 nmol/L) levels at plasma were significantly increased in placebo group (p < 0.05) compared to control. Upon theophylline therapy, SOD (0.096 U/mg) activity at diaphragm and plasma NO (22.3-29.7 mu mol/L) levels were significantly increased (p < 0.05); whereas XO (0.39 U/g) activity at lungs and plasma MDA (0.36 nmol/L) levels were significantly decreased (p < 0.001) compared to placebo group. Conclusion: In this study, we showed that pulmonary and systemic oxidative stresses accompany MV application induced diaphragmatic oxidative stress in rats and this oxidative stress is predominantly occurs through XO pathway. Also it was demonstrated that theophylline alleviates this oxidative stress by increasing the SOD activity and repressing the XO activity. However, more animal and human studies at molecular level are needed on this subject. Conflict of Interest: Authors have no conflict of interest.Öğe The Effects of Caffeic Acid Phenethyl Ester and Ellagic Acid on the Levels of Malondialdehyde, Reduced Glutathione and Nitric Oxide in the Lung, Liver and Kidney Tissues in Acute Diazinon Toxicity in Rats(MEDWELL ONLINE, 2011) Alp, Harun; Aytekin, Ismail; Atakisi, Onur; Hatipoglu, Namik Kemal; Basarali, Kemal; Ogun, Metin; Buyukbas, SadikThe aim of this study was to investigate the effects of Caffeic Acid Phenethyl Ester (CAPE) and Ellagic Acid (EA) on acitivities of Malondialdehyde (MDA), reduced Glutathione (GSH) and Nitric Oxide (NO) in rat lung, liver and kidney tissues in acute Diazinon (DI) toxicity. Six groups of 6 Sprague Dawley rats were used comprising control, CAPE, EA, DI control, DI+CAPE and DI+EA. Tissue samples were analysed for GSH, MDA and NO levels in lung, liver and kidney tissues. Biochemical parameters were measured colormetrically by spectrophotometer. Control, CAPE and EA groups showed no statistically significant difference whereas DI+medication groups revealed that CAPE and EA increased the level of GSH in liver tissue by blocking the DI effect. NO levels in lung, liver and kidney tissues were significantly increased by DI but CAPE and EA attenuated those levels. In DI+medication groups, MDA levels showed no significant change in kidney and liver tissues but in lung tissues, CAPE and EA reduced the MDA level by blocking the DI effect. It was concluded that CAPE and EA which showed similar effects to each other could be used for protection and support against oxidative stress caused by acute DI intoxication.Öğe EFFECTS OF COENZYME Q10 AND alpha-LIPOIC ACID SUPPLEMENTATION ON EXERCISE-INDUCED LIPID PEROXIDATION AND ANTIOXIDANT STATUS OF DIABETIC RATS(SPRINGER TOKYO, 2009) Okudan, Nilsel; Tav, Rahime Celik; Gokbel, Hakki; Buyukbas, Sadik[Abstract not Available]Öğe Effects of grape seed extract on oxidative stress and antioxidant defense markers in streptozotocin-induced diabetic rats(TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY, 2015) Belviranli, Muaz; Gokbel, Hakki; Okudan, Nilsel; Buyukbas, SadikBackground/aim: To evaluate the effects of grape seed extract (GSE) supplementation on oxidative stress and antioxidant markers in streptozotocin (STZ)-induced diabetic rats. Materials and methods: Thirty-six male rats were divided into the following four groups: control, GSE-supplemented control, diabetic, and GSE-supplemented diabetic. Beginning on day 7 after STZ injection, the rats were administered GSE (100 mg kg(-1) day(-1)) in drinking water for 6 weeks. At the end of week 6, rats were sacrificed by cardiac puncture. Plasma nitric oxide (NO) levels and xanthine oxidase (XO), adenosine deaminase (ADA), and glutathione peroxidase (GPx) activities were analyzed. Results: Both XO and ADA activities increased and NO levels decreased in diabetic rats (P < 0.05). GSE supplementation normalized all of these changes. Antioxidant enzyme activities decreased in diabetic rats compared to the controls (P < 0.05). GSE supplementation increased antioxidant enzyme activities in both diabetic and healthy rats (P < 0.05). Conclusion: These findings suggest that 6 weeks of oral GSE supplementation may prevent oxidative stress and improve antioxidant status in diabetic rats.Öğe Effects of Grape Seed Polyphenols on Oxidative Damage in Liver Tissue of Acutely and Chronically Exercised Rats(WILEY, 2013) Belviranli, Muaz; Gokbel, Hakki; Okudan, Nilsel; Buyukbas, SadikThe objective of the present study was to investigate the effects of grape seed extract (GSE) supplementation on oxidative stress and antioxidant defense markers in liver tissue of acutely and chronically exercised rats. Rats were randomly assigned to six groups: Control (C), Control Chronic Exercise (CE), Control Acute Exercise (AE), GSE-supplemented Control (GC), GSE-supplemented Chronic Exercise(GCE) and GSE-supplemented Acute Exercise (GAE). Rats in the chronic exercise groups were subjected to a six-week treadmill running and in the acute exercise groups performed an exhaustive running. Rats in the GSE supplemented groups received GSE (100 mg.kg1.day1) in drinking water for 6 weeks. Liver tissues of the rats were taken for the analysis of malondialdehyde (MDA), nitric oxide (NO) levels and total antioxidant activity (AOA) and xanthine oxidase (XO) activities. MDA levels decreased with GSE supplementation in control groups but increased in acute and chronic exercise groups compared to their non-supplemented control. NO levels increased with GSE supplementation. XO activities were higher in AE group compared to the CE group. AOA decreased with GSE supplementation. In conclusion, while acute exercise triggers oxidative stress, chronic exercise has protective role against oxidative stress. GSE has a limited antioxidant effect on exercise-induced oxidative stress in liver tissue. Copyright (c) 2012 John Wiley & Sons, Ltd.Öğe The evaluation of protective effects of FK-506 on neural ischemic-reperfusion injury: an experimental study(SPRINGER HEIDELBERG, 2007) Eser, Olcay; Kalkan, Erdal; Cosar, Murat; Yaman, Mehmet; Buyukbas, Sadik; Avunduk, Mustafa Cihat; Fidan, HueseyinObjective: In this study, we aimed to delineate the mode of neuroprotective action of FK-506, and demonstrated that FK-506 could decrease oxidative stress and apoptotic cell death in an in vivo rat model of neural ischemia-reperfusion after hemorrhagic shock. Methods: Thirty rats were used as experimental subjects and divided into five equal groups. Group A rats (sham group, n = 6) were anesthetized and craniotomies were performed for collecting brain tissue samples. In group B ischemia-reperfusion (I/R + 1 h, n = 6), group C (I/R + 24 h, n = 6), group D (I/R + 1 h FK-506, n = 6) and group E (I/R + 24 h FK-506, n = 6), systolic blood pressure of the rats decreased to 40-50% of the normal level via bleeding from the femoral vein. Thus, a hemorrhagic shock and ischemic neural tissue model was formed. The blood was retained and given to the remaining animals in groups B, C, D and E via femoral vein for reperfusion 20 min after the procedure. In group D and E, 1 mg/kg FK-506 in 0.5 ml isotonic solution was administered to the rats 5 min before reperfusion. Group B and D rats were sacrificed after 1 hand group C and E rats were sacrificed 24 h after reperfusion; the rats were sacrificed via bleeding associated with intracardiac puncture. Craniotomy was also performed in groups B, C, D and E and brain tissue samples were fixed using neutral buffered 10% formaldehyde solution for immunohistopathological examination as in group A. Brain tissue superoxide dismutase (SOD) activities, malondialdehyde (MDA) levels, tissue myeloperoxydase (MPO) activities and apoptotic cell analyses with APO 2.7 immunohistochemically were also performed in all groups. Results: The result of the study revealed that the SOD activities were lower for groups B (I/R + 1 h) and C (I/ R + 24 h) than for group A (sham group) (p < 0.05). In addition, SOD activities were higher in groups D (I/ R + 1 h FK-506) and E (I/R + 24 h FK-506) than in groups B (I/R + 1 h) and C (I/R + 24 h) (p < 0.05). MDA levels, MPO activities and the number of apoptotic cells were lower in group A (sham group) than in groups B (I/R + 1 h) and C (I/R + 24 h) (p < 0.05). In addition to these MDA levels, MPO activities and the number of apoptotic cells were higher in groups B (I/R + 1 h) and C (I/R + 24 h) as compared to groups D (I/R + 1 h FK-506) and E (I/R + 24 h FK-506) (p < 0.05). Conclusion: The results suggest that the prophylactic use of FK-506 in an in situ ischemic neural tissue may prevent reperfusion injury.Öğe Ghrelin levels in children with adenoid or chronic tonsil hypertrophies before and after surgery(ELSEVIER IRELAND LTD, 2009) Koc, Sema; Ozturk, Kayhan; Buyukbas, Sadik; Kocabas, Volkan; Ozer, Bedri; Kara, MedineObjective: We aimed to evaluate the ghrelin levels in the children with adenoid or tonsil hyperthrophies. Methods: The Study included 27 children (17 boys and 10 girls). Mean age was 6.9 +/- 3.5 years, ranging from 3 to 16. Ghrelin levels in the patients and their weight and height measurements were evaluated before surgery and after 3 months later of the operation. Results: While 18 (67%) children were operated for adenoid hypertrophy, 9 (33%) children were operated for adenoid and tonsil hypertrophy. it was found that postoperative ghrelin levels were significantly decreased whereas weight and BMI scores were significantly increased (p < 0.01). A weak correlation was observed between preoperative ghrelin and weight (r = -0.29), This negative Correlation became more profound at the postoperative 3rd month examination (r = 0.85) (p < 0.01). Conclusions: The present Study showed that the surgical treatment provides positive contributions on the growing of children with adenoid and tonsil hypertrophies. The ghrelin levels were significantly decreased at the postoperative period in the children, and a negative relationship was observed between the ghrelin levels and the weight, These findings Suggest that blood ghrelin levels may be useful as a parameter for following the development of the children. (c) 2009 Elsevier Ireland Ltd. All rights reserved.Öğe The neuroprotective effect of dexmedetomidine in the hippocampus of rabbits after subarachnoid hemorrhage(ELSEVIER SCIENCE INC, 2009) Cosar, Murat; Eser, Olcay; Fidan, Huseyin; Sahin, Onder; Buyukbas, Sadik; Ela, Yuksel; Yagmurca, MuratBackground: Subarachnoid hemorrhage is a Serious Condition. often accompanied by cerebral vasospasm. which may lead to brain ischemia and neurologic deterioration. We evaluated if dexmedetomidine has neuroprotective effects in the hippocampus of vasospastic SAH rabbits or not. Materials and Methods: Eighteen New Zealand rabbits were taken. Ail experimental SAH model was Formed by injecting 0.9 mL of autologous arterial blood per 1 kg of body weight to the cisterna magna of 12 rabbits. Craniotomy was performed ill the control group (n = 6) except performing experimental SAH. Rabbits in the SAH-alone (n = 6) group were infused with 5 mL . kg(-1) . h(-1) 0.9% sodium chloride, and rabbits (n = 6) in the SAH-dexmedetomidine group were infused with 5 mu g . kg(-1) . h(-1) dexmedetomidine for 2 hours, 48 hours alter SAH was established. Rabbits of all groups were sacrificed via penthotal 24 hours after dexmedetomidine administration. Brains were removed immediately. and hippocampal tissues were blocked from the right hemisphere for histopathologic study. In addition to this, hippocampal tissues of left hemispheres were dissected for biochemical analyses to evaluate MDA levels, activity of XO, and SOD. Results: The histopathologic study showed that dexmedetomidine may have a neuroprotective effect in SAH-induced hippocampal injuries. The biochemical parameters Support the neuroprotective effect of dexmedetomidine (P < .05). Conclusion: Our Study showed that dexmedetomidine may have a neuroprotective effect ill the hippocampus of vasospastic SAH rabbits. (C) 2009 Elsevier Inc. All rights reserved.Öğe OXIDATIVE STRESS AND ANTIOXIDANT MARKERS IN PLASMA AFTER REPEATED SUPRAMAXIMAL EXERCISES: THE EFFECT OF COENZYME Q(10)(SPRINGER TOKYO, 2009) Gokbel, Hakki; Gul, Ibrahim; Belviranli, Muaz; Okudan, Nilsel; Buyukbas, Sadik; Basarali, Kemal M.[Abstract not Available]Öğe The protective effect of alpha-lipoic acid in experimental ovarian ischaemia-reperfusion injury(BLACKWELL PUBLISHING, 2007) Cosar, Emine; Sahin, Figen Kir; Koken, Guelenguel; Toy, Hatice; Basarali, Kemal; Buyukbas, SadikWe investigated the effect of alpha-lipoic acid (LA) on reperfusion injury in a rat ovarian torsion-detorsion model. The changes in tissue and plasma levels of malondialdehyde (MDA), end-product of lipid peroxidation, superoxide dismutase (SOD), xanthine oxidase (XO) and nitric oxide (NO), were determined. Ovarian histopathological findings were scored and compared among groups. Thirty-two female Sprague-Dawley rats were divided into four groups. Sham operation was performed in group I; in group II only ovarian torsion was performed. Group III received intraperitoneal injections of saline, and group IV received LA via intraperitoneal injections (LA group: aqueous solution at 36 mg/kg of body weight per day, saline group: equal volume of saline) 21, nine, and one hour before torsion of the ovary. Rats in the torsion group were killed after 360 degrees clockwise adnexial torsion for three hours, and ovaries were harvested. After three hours of adnexial detorsion, the rats in saline group and LA group were killed and adnexa were surgically removed. Ovarian tissue damage scores were significantly different among groups and were seen to correlate with tissue MDA levels. Ovarian tissue and serum MDA, NO and serum XO levels in the group III were significantly higher than those of the groups I and IV (P < 0.05). The serum levels of SOD in the group III were significantly lower than those of the groups I and IV (P < 0.05). These results suggest that LA pretreatment has beneficial effects in the prevention of ischaemia-reperfusion injury of the ovaries.Öğe Protective effect of aprotinin on ischemia-reperfusion injury in rat ovary(WILEY, 2008) Sahin, Figen Kir; Cosar, Emine; Koken, Gulengul; Toy, Hatice; Basarali, Kemal; Buyukbas, SadikAim: We investigated the effects of aprotinin on reperfusion injury in a controlled experimental rat torsion-detorsion model. Methods: Thirty-two female Sprague-Dawley rats were divided into four groups. Sham operation was performed in group I; in group II only ovarian torsion was performed. In group III, torsion-detorsion was performed, plus 3 mL/kg saline was injected i.v. 30 min before detorsion. In group IV, torsion-detorsion was performed, plus aprotinin (30 000 KIU/kg) was injected 30 min before detorsion. Rats in the torsion group were killed after 360 degrees clockwise adnexial torsion for 3 h, and the ovaries were harvested. After 3 h of adnexial detorsion, the rats in the saline and aprotinin groups were killed and the adnexa were surgically removed. Results: Ovarian tissue damage scores were significantly different among groups. Ovarian tissue and serum malondialdehyde levels in group III were significantly higher than those of groups I and IV (P < 0.05). The serum levels of superoxide dismutase in group III were significantly lower than those of groups I and IV (P = 0.01). Tissue and serum xanthine oxidase, nitric oxide, and tissue superoxide dismutase levels were comparable among groups (P > 0.05). Conclusions: Aprotinin attenuates ischemia-reperfusion injury in a rat adnexial torsion-detorsion model.Öğe Relationship Between Iron-Deficiency Anemia and Periodontal Status in Female Patients(AMER ACAD PERIODONTOLOGY, 2009) Enhos, Sukru; Duran, Ismet; Erdem, Sami; Buyukbas, SadikBackground: The aim of this study was to evaluate the periodontal status of patients with iron-deficiency anemia (IDA) and the correlation of changes in serum and gingival crevicular fluid (GCF) ferritin levels after periodontal therapy. Methods: Nineteen female patients with anemic hematologic values were classified as group A, and 20 healthy females with normal hematologic values were classified as group B. After group A was recruited, group B was enrolled with patients who had similar gingival indices as group A. At baseline and the 3-month follow-up visit, clinical periodontal indices and hematologic parameters were recorded, and GCF samples were taken. All patients received an oral hygiene-improvement session followed by scaling, and sites with >4-mm probing depths received root planing. At the 3-month follow-up visit, all measurements and analyses were repeated. Results: During the follow-up period, all clinical indices decreased in both groups (P<0.05), but the gingival index in group A did not change. The GCF ferritin concentration showed statistically significant decreases (P<0.05), but total amounts of ferritin in GCF did not change. No significant correlation was found between serum and GCF ferritin levels. Conclusion: The findings of this study showed that changes in serum ferritin levels did not correlate with the GCF ferritin levels, and IDA was not a direct risk factor for periodontal diseases. J Periodontol 2009;80:1750-1755.Öğe Role of caffeic acid phenethyl ester, an active component of propolis, against NAOH-induced esophageal burns in rats(ELSEVIER IRELAND LTD, 2006) Ocakci, Ayse; Kanter, Mehmet; Cabuk, Mehmet; Buyukbas, SadikObjectives: This study was evaluated to investigate the efficacy of caffeic acid phenethyl ester (CAPE), which is a natural honeybee product exhibits a spectrum of biological activities including anti-microbial, anti-inflammatory, antioxidant and anti-tumoral actions, on the prevention of stricture development after esophageal caustic injuries in the rat. Methods: Thirty healthy mate Wistar albino rats were utilized in this study. The rats were randomly allotted into one of three experimental groups: group A (sham) animals were uninjured. Caustic esophageal burn was created by applying 1 ml 37.5% NaOH to the distal esophagus. Group B rats were injured but untreated. Group C rats were injured and received CAPE (10 mu mol/kg/day i.p. for 28 days). Efficacy of the treatment was assessed by measuring the esophageal transit time, stenosis index, histopathologic damage score and biochemically by determining tissue hydroxyproline content, lipid peroxidation and antioxidant enzyme activities. Results: The esophageal. transit time, the stenosis index, histopathologic damage score and the hydroxyproline level were significantly increased in the untreated group compared with the sham and CAPE-treated groups. Treatment with CAPE decreased tissue hydroxyproline Levels, histological damage, and the stenosis index, but except the esophageal transit time. Caustic esophageal burn also increased the lipid peroxidation and decreased the antioxidant enzyme activities in the untreated group. CAPE treatments decreased the elevated lipid peroxidation and also increased the reduced antioxidant enzyme activities. In corrosive esophageal burn group with no treatment, the most consistent findings were degenerative changes and increased in submucosal collagen content, and the luminal narrowing. CAPE treatment protected esophagus. Nevertheless, there was the slight increase in submucosal collagen. Conclusions: It is concluded that CAPE has a preventive effect on the stricture development after esophageal caustic injuries in the rat. (C) 2006 Elsevier Ireland Ltd. All rights reserved.
