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Öğe Effect of Topically Applied Azithromycin on Corneal Epithelial and Endothelial Apoptosis in a Rat Model of Corneal Alkali Burn(Lippincott Williams & Wilkins, 2016) Arikan, Sedat; Karaca, Turan; Ertekin, Yusuf Haydar; Comez, Arzu Taskiran; Ersan, Ismail; Demirtas, Selim; Elmas, SaitPurpose: To investigate the antiapoptotic effect of topically administered azithromycin (AZM) on corneal epithelial and endothelial cells in a rat model of corneal alkali burn. Methods: Twenty-four Wistar albino rats were divided into 4 equal groups as pseudovehicle (group 1), control (group 2), alkali burned (group 3), and treatment (group 4) groups. Alkali injury was induced only in the right corneas of rats belonging to groups 3 and 4 using 1N NaOH. The rats in group 3 and the rats in group 4 were respectively treated either with an artificial tear gel or with 1.5% AZM eye drops for 5 days. At the fifth day of the experiment, the apoptosis in the corneal epithelium and endothelium of all rats was assessed using a terminal dUTP nick-end labeling (TUNEL) assay. In addition, tumor necrosis factor-alpha (TNF-alpha) density in the corneal epithelium was measured in all rats. Results: The mean numbers of TUNEL+ cells in the corneal epithelium and endothelium of rats in group 3 were 117.1 +/- 23.8 and 34.6.+/- 11.3, respectively, whereas in group 4, they were 75.8 +/- 15.7 and 14.7 +/- 3.5, respectively. Also the mean TNF-alpha densities in the corneal epithelium in group 3 and group 4 were 2.65 +/- 1.3 and 1.65 +/- 1.1, respectively. There was a significant decrease in the mean number of TUNEL+ cells in the corneal epithelium and endothelium and in the mean TNF-alpha density in the corneal epithelium of rats in group 4, when compared with group 3. Conclusions: Topically applied AZM can decrease TNF-alpha-induced apoptosis in corneal alkali burn.Öğe Evaluation of the protective effects of hesperetin against cisplatin-induced ototoxicity in a rat animal model(Elsevier Ireland Ltd, 2016) Kara, Medine; Turkon, Hakan; Karaca, Turan; Guclu, Oguz; Uysal, Sema; Turkyilmaz, Mehmet; Demirtas, SelimObjectives: We aimed to investigate the effects of hesperetin as a flavanon both histopathologically and immunohistochemically on cochlear apoptosis in a rat model of cisplatin-induced ototoxicity (CIO). The evaluation of the effects of hesperetin on cisplatin-induced hearing loss was performed using distortion product otoacoustic emission (DPOAE). Methods: Twenty-eight wistar albino rats were used in the current study. The rats were randomly divided into four groups with seven rats in each group. Group C was exposed to a single dose of cisplatin (12 mg/kg) by intraperitoneal injection. Group CH received intraperitoneally cisplatin (12 mg/kg) and hesperetin (20 mg/kg). Group H was exposed to hesperetin (20 mg/kg) intraperitoneally. The sham group (group S) received normal saline (6 cc) intraperitoneally. The measurements of DPOAE and signal-noise ratios (SNR) were performed before the treatment and again on the first and 6 days after administration of the drugs. Rats were sacrificed and cochleae were dissected 10 days after drug administration. The cochlear tissue was assessed in all groups by histopathologic, immunohistochemical and TUNEL assay. In addition, serum oxidative stress markers and antioxidant parameters were analyzed. Results: There was a significant difference between the basal value and the sixth day at frequencies 8.4, 9.6 and 9.96 for group C. We also found a significant difference between the first and sixth day at frequencies 7.2, 8.4, 9.6 and 9.96. On the 6th day, there were significant differences between C and S groups at all frequencies except 2.4. We showed a significant difference between C and H groups at frequencies 4.8, 6.0, 8.4, 9.6 and 9.96. There was also a significant difference between C and CH groups at frequencies 2.4, and 3.6. We found lower levels of oxidants and higher levels of antioxidants in CH group as compared to C group. C group had a significantly greater number of TUNEL-positive cells than did S, H and CH groups. The number of TUNEL-positive cells in CH group was higher than in S and H groups. There was a significant difference between the positive PCNA cells of CH group compared to S and H groups in spiral ganglion and stria vascularis. In addition, there were no positive PCNA cells in C group. Conclusions: Hesperetin may prevent ototoxicity by increased antioxidant enzymes and reduced oxidant parameters and protected against apoptosis resulting from a proliferation of cochlear cells in CIO. (C) 2016 Elsevier Ireland Ltd. All rights reserved.Öğe The effect of hesperetin on ischemia-reperfusion injury in rat ovary(Springer Heidelberg, 2014) Gungor, Ayse Nur Cakir; Gencer, Meryem; Karaca, Turan; Hacivelioglu, Servet; Uysal, Ahmet; Korkmaz, Fatma; Demirtas, SelimHesperidin (HES), a citrus fruit extract, has beneficial effects on various ischemia/reperfusion (I/R) models. We aimed to evaluate the possible positive effects of hesperetin (HPT), an active metabolite of HES, on a rat ovarian I/R model. We divided 24 Wistar Albino rats into four groups. Group I (n = 6) was sham operated, Group II (n = 6) was the I/R group, Group III (n = 6) was the I/R + solvent group and Group IV (n = 6) was the I/R + HPT group. Three hours of ischemia and 3 h of reperfusion were performed on each rat in Groups II, III, and IV. Dimethyl sulfoxide (DMSO) was given intraperitoneally to the rats in the III. Group, and 50 mg/kg of HPT dissolved in DMSO was given intraperitoneally to the rats in the IV. Group 30 min before reperfusion. After 3 h of reperfusion, the ipsilateral ovaries of the rats were examined immunohistochemically to detect apoptosis. Hematoxylin and eosin (H and E) staining demonstrated less edema and hemorrhage in the group where HPT was applied. Caspase-3 and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) staining showed significantly lower apoptosis in the group where HPT was used when compared to either the I/R or solvent group. To the best of our knowledge, this is the first study that shows the beneficial effects of HPT in an ovarian I/R injury. HPT improved tissue damage and apoptosis caused by I/R injury. To identify the possible positive effects of HPT in ovarian torsion of humans and use in clinical practice, more studies must be performed.Öğe The protective effect of quercetin on IMA levels and apoptosis in experimental ovarian ischemia-reperfusion injury(Elsevier Science Bv, 2014) Gencer, Meryem; Karaca, Turan; Gungor, Ayse N. C.; Hacivehoglu, Servet O.; Demirtas, Selim; Turkon, Hakan; Uysal, AhmetObjective: To investigate the protective effect of quercetin (QE), an anti-inflammatory and anti-oxidant agent, on torsion-detorsion induced histopathological changes and blood IMA levels in experimental ovarian ischemia-reperfusion (IR) injury. Study design: Twenty-four female Wistar rats were randomly divided into four groups in this study (n = 6). Group I, (sham operation); Group II, torsion-detorsion plus saline (IR); Group III, torsiondetorsion plus solvent (dimethylsulfoxide: DMSO, IR + DMSO); Group IV, torsion-detorsion plus 15 mg/kg/bw quercetin (IR + QE) injected intraperitoneally 30 min prior to detorsion. After 3 h of reperfusion, the right ovaries were removed surgically. The ovary tissue samples were fixed in 10% formalin solution for histopathological and immunohistochemical examination. Blood samples were obtained at the end of the procedures for each group of animals. Results: Ovarian sections in Groups II and III showed higher follicular cell degeneration, hemorrhage, vascular congestion and edema when compared with Group I. Administration of quercetin in rats significantly prevented degenerative changes in the ovary. Significantly less histopathological changes were found in Group IV compared with Groups II and III. Caspase-3 and TUNEL positive cells were detected in the ovarian surface, follicle epithelium, and stromal cells in all experimental groups, and there was a significant increase in Groups II and III compared with Group I (P < 0.05). Treatment with quercetin decreased the number of caspase-3 and TUNEL positive cells. IR increased the ischemia modified albumin (IMA) levels in comparison to the sham group (1.06 +/- 0.10 ABSU and 0.92 +/- 0.08 ABSU, P < 0.05). Quercetin administration before IR reduced the levels of IMA (0.93 + 0.08 ABSU, P < 0.05). Conclusion: Administration of quercetin is effective in preventing tissue damage induced by IR injury in ovaries. (C) 2014 Elsevier Ireland Ltd. All rights reserved.
