Browsing by Author "Akyol, Ö"

Now showing 1 - 3 of 3

Concentrations of Copper, Zinc and Various Elements in Serum of Patients With Bronchial Asthma
(Gustav Fischer verlag, 2000) Vural, H; Uzun, K; Uz, E; Koçyigit, A; Çigli, A; Akyol, Ö
In this study, serum copper, zinc, magnesium, iron and calcium concentrations were investigated in 40 patients with bronchial asthma (BA) and in 43 healthy subjects. Copper and calcium levels were found to be increased in patients with BA compared to the control group (p<0.001 and p<0.001 respectively). On the other hand, the serum zinc level was significantly lower in healthy subjects (p<0.01). No changes were found in serum magnesium and iron levels in patients with BA compared to controls. In addition to various elements, certain serum proteins such as albumin, transferrin and ferritin were also assessed to determine whether there was a relationship between the elements and proteins in patients with BA. There was only a significant decrease in albumin concentration in patients with BA (p<0.05).
Inhibitory Effect of Caffeic Acid Phenethyl Ester on Bleomycine-Induced Lung Fibrosis in Rats
(Elsevier, 2004) Özyurt, H; Sögüt, S; Yildirim, Z; Kart, L; Iraz, M; Armutçu, F; Akyol, Ö
Background: Pulmonary fibrosis (PF) induced by anticancerogenic bleomycin (BLM) is one of the more common side effects encountered during cancer treatment. It has been suggested in the last decades that the main responsible agent in PF is reactive oxygen species which were generated also in normal physiological conditions in the human body. In this experimental study, we investigated the preventive or attenuating effects of caffeic acid phenethyl ester (CAPE) that has been demonstrated to have anti-inflammatory, cytocytatic, anti cancerogenic, antiprolipherative and antioxidant effects on BLM-induced PF. Methods: Thirty-six Sprague-Dawley rats were divided randomly into four groups as sham operation, BLM, BLM + vitamin E (vit E), and BLM + CAPE groups. BLM (7.5 mg/kg, single dose) was applied intratracheally, and CAPE and vit E intraperitoneally in the appropriate groups. At the end of the fibrosis processes, lung tissues were removed and the levels of tissues hydroxyproline (OH-proline), malondialdehyde (MDA) and NO as well as the activities of superoxide dismutase (SOD), catalase (CAT) and myeloperoxidase (MPO) were determined. Also, the weights of the rats were recorded at 7th and 14th days of the experiments. Results: BLM application to the rats resulted in a significant increase in the OH-proline level as compared to the controls. Administration of CAPE and vit E led to the remarkable reduction of total lung OH-proline levels compared to the rats treated with BLM alone (p < 0.0001). There were a decreases in antioxidant enzyme (SOD and CAT) activities while an increase in MPO activity in BLM group was found vs. the control group (p < 0.0001). CAPE had a regulator effect on these parameters: the increase in CAT and SOD activities and the decrease in MPO activity were seen after CAPE application. NO, MDA and OH-proline levels were increased in BLM group vs. the control group. CAPE was more effective in decreasing the tissue levels of NO, MDA and OH-proline than vit E. MPO activity, as a good marker of neutrophil sequestration to the tissues, in the BLM group was decreased by CAPE approximately to the control group. Conclusion: We suggest that CAPE is more effective on the prevention of BLM-induced fibrosis via antioxidant and free radical scavenger properties than vit E at the doses used in the present study. CAPE has some attenuating effects on BLM-induced PF affecting both oxidant and antioxidant systems as well as neutrophils sequestration. (C) 2003 Elsevier B.V. All rights reserved.
Role of Caffeic Acid Phenethyl Ester, an Active Component of Propolis, Against Cisplatin-Induced Nephrotoxicity in Rats
(Wiley, 2004) Özen, S; Akyol, Ö; Iraz, M; Sögüt, S; Özugurlu, F; Özyurt, H; Yildirim, Z
We have investigated the effect of caffeic acid phenethyl ester (CAPE) on cisplatin-induced nephrotoxicity in rats. Administration of a single dose of cisplatin resulted in the elevation of blood area nitrogen and creatinine in serum, as well as nitric oxide in kidney tissue of rats. Cisplatin also caused reduction of catalase (P < 0.0001), superoxide dismutase (P = 0.149) and glutathrone peroxidase (P < 0.0001) activities in kidney tissue. Although cisplatin caused elevation in malondialdehyde levels and myeloperoxidase activities in kidney tissue, they were not statistically significant. Caffeic acid phenethyl ester was found to be protective against cisplatin-induced antioxidant enzyme reductions. Treatment with free-radical scavenger CAPE attenuated the increase in plasma blood area nitrogen and kidney nitric oxide levels, and showed histopathological protection against cisplatin-induced acute renal failure. Extensive epithelial cell vacuolization, swelling, desquamation and necrosis were observed in the kidney of the cisplatin-treated rat. There were also larger tubular lumens in cisplatin-treated rats than those of the control and the CAPE groups. Caffeic acid phenethyl ester caused a marked reduction in the extent of tubular damage. It is concluded that administration of cisplatin imposes an oxidative stress to renal tissue and CAPE confers protection against the oxidative damage associated with cisplatin. This mechanism may be attributed to its free-oxygen-radical scavenging activity. Copyright (C) 2004 John Wiley Sons, Ltd.