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    Anti-Apoptotic and Anti-Oxidant Effects of Caffeic Acid Phenethyl Ester on Cadmium-Induced Testicular Toxicity in Rats
    (Humana Press Inc, 2016) Erboğa, Mustafa; Kanter, Mehmet; Aktaş, Cevat; Dönmez, Yeliz Bozdemir; Erboğa, Zeynep Fidanol; Aktaş, Emel; Gürel, Ahmet
    Cadmium (Cd) is a serious environmental and occupational contaminant and may represent a serious health hazard to humans and other animals. Cd is reported to induce the generation of reactive oxygen species, and induces testicular damage in many species of animals. The goal of our study was to examine the anti-apoptotic and anti-oxidant effects of caffeic acid phenethyl ester (CAPE) on Cd-induced oxidative stress, apoptosis, and testicular injury in rats. A total of 40 male Wistar albino rats were divided into four groups: control, CAPE alone, Cd-treated, and Cd-treated with CAPE; each group consisted of 10 animals. To induce toxicity, Cd (1 mg/kg body weight) was dissolved in normal saline and subcutaneously injected into rats for 30 days. The rats in CAPE-treated group were given a daily dose of 10 mu mol/kg body weight of CAPE by using intraperitoneal injection. This application was continued daily for a total of 30 days. To date, no examinations of the anti-apoptotic and anti-oxidant properties of CAPE on Cd-induced apoptosis, oxidative damage, and testicular injury in rat testes have been reported. CAPE-treated animals showed an improved histological appearance and serum testosterone levels in Cd-treated group. Our data indicate a significant reduction in the number of apoptotic cells in testis tissues of the Cd-treated group with CAPE treatment. Moreover, CAPE significantly suppressed lipid peroxidation, compensated deficits in the anti-oxidant defenses in testes tissue resulted from Cd administration. These findings suggest that the protective potential of CAPE in Cd toxicity might be due to its anti-oxidant and anti-apoptotic properties, which could be useful for achieving optimum effects in Cd-induced testicular injury.
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    Anti-apoptotic effects of curcumin on cadmium-induced apoptosis in rat testes
    (Sage Publications Inc, 2012) Aktaş, Cevat; Kanter, Mehmet; Erboğa, Mustafa; Öztürk, Şamil
    Cadmium (Cd) is one of the environmental pollutants affecting various tissues and organs including testis. The aim of this study was to investigate the anti-apoptotic effects of curcumin (Cur) on Cd-induced apoptosis in rat testes. The rats were randomly allotted into one of three experimental groups: control, Cd treated and Cd treated with Cur; each group contained 10 animals. The control group received 2 ml/day of dimethyl sulfoxide (DMSO). To induce toxicity, Cd (1 mg/kg body weight) was dissolved in normal saline and subcutaneously injected into rats for 4 weeks. The rats in Cur-treated group was given a daily dose of 100 mg/kg of Cur for 4 weeks. To date, no examinations of the anti-apoptotic properties of Cur on Cd-induced apoptosis in rat testes have been reported. The mean seminiferous tubule diameter, mean testicular biopsy score values and serum testosterone levels were significantly decreased in Cd-treated groups were compared to the control group. Furthermore, the Cur-treated animals showed an improved histological appearance and serum testosterone levels in Cd-treated group. Our data indicate a significant reduction in the activity of in situ identification of apoptosis using terminal dUTP nick end-labeling in testis tissues of the Cd-treated group with Cur therapy. The present study showed that Cur treatment protected testes against toxic effects of Cd. We believe that further preclinical research into the utility of Cur may indicate its usefulness as a potential treatment on the spermatogenesis after testicular injury caused by Cd-treated rats.
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    Antiapoptotic and proliferative activity of curcumin on ovarian follicles in mice exposed to whole body ionizing radiation
    (Sage Publications Inc, 2012) Aktaş, Cevat; Kanter, Mehmet; Koçak, Zafer
    The aim of this study was to evaluate the antiapoptotic and proliferative activity of curcumin (Cur) on the ovarian follicles in mice exposed to whole body ionizing radiation (Rd). The mice were exposed to 8.3 gray whole body Rd, and Cur groups were given as a daily dose of 100 mg/kg of Cur for 10 days (10 days before Rd). The ovaries were collected 3 and 12 h after irradiation. To date, no such studies have been performed on antiapoptotic and proliferative activity of Cur on the ovarian follicles in mice exposed to whole body Rd. Analysis of mice ovary after exposure to Rd by terminal-deoxynucleotidyl-transferase-mediated dUTP nick end labeling showed that there were apoptotic cells both in the follicular wall and the antrum, and that the number of follicles showing early atresic features was high 3 h after Rd. On the other hand, analysis of mice ovary 12 h after exposure to Rd showed that the number of follicles containing apoptotic cells with advanced atresic features was significantly higher when compared to the 3-h Rd exposure group. The proliferating cell nuclear antigen-positive granulosa cells were decreased in association with follicular atresia. The groups given treatment were observed to have some benefit from Cur against the damage caused by Rd. The results of this study demonstrate that Cur prevents follicular atresia in Rd-induced apoptosis in ovarian follicles.
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    Antioxidant and anti-apoptotic effects of onion (Allium cepa) extract on doxorubicin-induced cardiotoxicity in rats
    (Wiley, 2013) Alpsoy, Şeref; Aktaş, Cevat; Uygur, Ramazan; Topçu, Birol; Kanter, Mehmet; Erboğa, Mustafa; Gedikbaşı, Asuman
    The aim of this study was to investigate the antioxidant and anti-apoptotic effects of onion (Allium cepa) extracts (ACE) on doxorubicin (DOX)-induced cardiotoxicity. The rats in the ACE-pretreated group were given a daily dose of 1 ml ACE for 14 days. To induce cardiotoxicity, DOX (30 mg kg-1 body weight) was injected intraperitoneally by a single dose and the rats were sacrificed after 48 h. To date, no such studies have been performed on the cardioprotective and anti-apoptotic potential of ACE on DOX-induced cardiotoxicity. Our data indicate a significant reduction in the activity of in situ identification of apoptosis using terminal dUTP nick end-labeling in cardiomyocytes of the DOX-treated group with ACE therapy. The DOX-treated with ACE groups showed a significant decrease in malondialdehyde levels, and increased activities of superoxide dismutase, glutathione and glutathione peroxidase in comparison with the DOX-treated group. Creatine kinase, creatine kinase MB, lactate dehydrogenase activities and cardiac troponin I levels were significantly decreased in the DOX + ACE group in comparison with the DOX group. These biochemical and histological disturbances were effectively attenuated on pretreatment with ACE. The present study showed that ACE may be a suitable cardioprotector against toxic effects of DOX. Copyright (C) 2011 John Wiley & Sons, Ltd.
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    Antioxidative, antiapoptotic, and proliferative effect of curcumin on liver regeneration after partial hepatectomy in rats
    (Sage Publications Inc, 2015) Toydemir, Toygar; Kanter, Mehmet; Erboğa, Mustafa; Oğuz, Serhat; Erenoğlu, Cengiz
    The aim of the present study was to assess the influence of curcumin on liver regeneration after partial hepatectomy (PH) in rats. A total of 24 male Sprague Dawley rats were divided into three groups: sham-operated (SH), PH, and PH+curcumin; each group contains eight animals. The rats in curcumin-treated groups were given curcumin (in a dose of 100mg/kg body weight) once a day orally for 7days, starting 3days prior to hepatectomy operation. At 7days after resection, liver samples were collected. The malondialdehyde (MDA), superoxide dismutase (SOD), and glutathione (GSH) levels were estimated in liver homogenates. Moreover, histopathological examination, mitotic index (MI), proliferating cell nuclear antigen labeling, proliferation index (PI), transferase-mediated 2-deoxyuridine, 5-triphosphate nick end-labeling assay, and apoptotic index (AI) were evaluated at 7days after hepatectomy. As a result, curcumin significantly increased MI and PI and significantly decreased AI in PH rats. Additionally, curcumin remarkably inhibited MDA elevation, restored impaired antioxidant SOD activity and GSH level and also attenuated hepatic vacuolar degeneration and sinusoidal congestion. These results suggested that curcumin treatment had a beneficial effect on liver regenerative capacity of the remnant liver tissue after hepatectomy, probably due to its antioxidative, antiapoptotic, and proliferative properties.
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    Curcumin attenuates testicular damage, apoptotic germ cell death, and oxidative stress in streptozotocin-induced diabetic rats
    (Wiley-Blackwell, 2013) Kanter, Mehmet; Aktaş, Cevat; Erboğa, Mustafa
    Scope: The present study was designed to examine the protective and antioxidative effects of curcumin (Cur) on streptozotocin (STZ) induced testicular damage, apoptotic germ cell death, and oxidative stress. Methods and resultsDiabetes was induced by a single intraperitoneal injection of STZ (50 mg/kg). The rats in the Cur-treated group were given Cur (100 mg/kg) once a day intragastrik for 8 weeks starting 3 days prior to STZ injection. Cur treatment significantly decreased the elevated tissue malondialdehyde levels and increased the reduced superoxide dismutase, and glutathione peroxidase enzyme activities in testis tissues samples. The Cur-treated rats in the diabetic group showed an improved histological appearance and serum testosterone levels. Our data indicate a significant reduction in the activity of in situ identification of apoptosis using terminal dUTP nick end-labeling and there was a rise in the expression of proliferating cell nuclear antigen in testis tissues of Cur-treated rats in the diabetic group. ConclusionThese results demonstrate that Cur attenuated testicular damage in diabetic rats by decreasing oxidative stress.
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    Effect of Cadmium on Trophoblast Cell Proliferation and Apoptosis in Different Gestation Periods of Rat Placenta
    (Humana Press Inc, 2016) Erboğa, Mustafa; Kanter, Mehmet
    In this study, we aimed to show how cadmium (Cd) affects the trophoblast proliferation and differentiation in the placenta and the apoptotic activity in different gestational days and, hence, its effects of placental development with immunohistochemical and TUNEL techniques. Experimental model of our study consisted of placental development of control and Cd groups on 15, 17, 19, and 21th days of the gestation. Female rats in Cd groups were subcutaneously administered a single dose of 0.5 mg Cd/kg/day dissolved in sodium chloride as 2 mL/kg Cd chloride until the day they sacrificed. Embryo and placenta of female rats were separately removed on 15, 17, 19, and 21th days of the gestation in which the placental development takes place and placentas were processed for microscopic examinations. In the placentas of the control group, all layers were observed to be formed on the 15th gestational day and thereafter a continuous growth was monitored. In the Cd group also all layers existed from the 15th gestational day. However, they were smaller in size than control groups. Frequency of proliferating cell nuclear antigen (PCNA)-positive cells was decreased and the number of apoptotic cells was increased in all the gestational days related to Cd. In conclusion, Cd administered during the pregnancy was observed to cause abnormal placental development by disrupting the normal structure of the placenta, inhibiting the proliferation of trophoblast and increasing the number of apoptotic trophoblast cells.
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    Effect of Nigella sativa on biliary obstruction-induced oxidative stress and apoptosis in rats
    (Wiley-Blackwell, 2016) Burcu, B.; Kanter, Mehmet; Kanter, Betül; Eser, M.; Haspolat, Y.; Demirer, Selin; Dümür, Şeyma
    [No Abstract Available]
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    Effect of Urtica Dioica against Doxorubicin-Induced Cardiotoxicity in Rats through Suppression of Histological Damage, Oxidative Stress and Lipid Peroxidation
    (Modestum Ltd, 2016) Erboğa, Mustafa; Dönmez, Yeliz Bozdemir; Şener, Ümit; Erboğa, Zeynep Fidanol; Aktaş, Cevat; Kanter, Mehmet
    Objective: Doxorubicin (DOX) is a highly effective anti-cancer drug with limited clinical use due to its serious cardiotoxicity. Urtica dioica L. seeds (UD), have been widely used in folk medicine, particularly in the therapy for advanced cancer patients, possesses a potent anti-oxidant properties. The goal of present study was to investigate the cardioprotective effects of UD on DOX-induced cardiotoxicity. Method: The rats in the UD treated group were given intraperitoneally 2 ml/kg UD. To induce cardiotoxicity, 30 mg/kg DOX was injected intraperitoneally by a single dose and the rats were sacrificed after 48 h. Results: The present study revealed for the first time a protective role of UD against DOX-induced cardiotoxicity. UD therapy significantly protected against DOX-induced myocardial damage which was characterized by conduction abnormalities, vacuolization, inflammatory cell infiltration, hemorrhages, and myofibrillar disarrangement. As indicators of oxidative stress, DOX caused significantly increase lipid peroxidation and reduction in activities of antioxidant enzymes; superoxide dismutase, glutathione peroxidase, and catalase. UD treatment significantly attenuated DOX-induced oxidative injury. Conclusion: The present study showed that UD might be a suitable cardioprotector against toxic effects of DOX.
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    Effects of combined in ovo injection of dried whey and Enterococcus faecium on performance, ileal histomorphology, erythrocyte morphology and ileal microbiota of broiler chickens
    (Eugen Ulmer Gmbh Co, 2015) Coşkun, İsa; Tahtabiçen, Ersin; Koç, Fisun; Okur, Aylin Ağma; Yılmaz, K.; Kanter, Mehmet; Şamlı, Hasan Ersin
    The aim of this experiment was to determine the effects of in ovo injection of dried whey and Enterococcus faecium to fertile Ross 308 chicken eggs on performance, ileal histomorphology, ileum microbiota and edible viscera weights. A 2x2 factorial design was used. Fertile Ross 308 eggs were injected with 4 different solutions: A) control solution (distilled water), B) distilled water + 4% dried whey, C) distilled water + Enterococcus faecium, D) distilled water + 4% dried whey and Enterococcus faecium. Live weight, feed consumption, feed conversation ratio and ileal histomorphology, ileum microbiota, organ weight were recorded at 21 days of age. Live weight gain, feed consumption and feed conversion ratio were not affected by the treatments. At the end of the experiment, lactic acid bacteria (LAB) colonisation in ileum were 3.68, 4.81, 4.04 and 5.92 cfu/g respectively and the highest LAB colonisation was in the combined injection group. At the end of the experiment, villus height was 455, 484, 438 and 542 mu m respectively and the highest villus height was found in the combined injection group. Although broiler performance was not different among the groups, a combined injection of Enterococcus faecium and dried whey provided better LAB colonisation and increased villus height in ileum. In conclusion, a combined injection of Enterococcus faecium and dried whey has a symbiotic effect on ileal histomorphology and gut microbiota. However, further studies should be conducted to determine the effects of in ovo injection of different probiotic and/or symbiotic microorganisms and different stress factors on broiler performance.
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    Effects of Enterococcus faecium and dried whey on broiler performance, gut histomorphology and intestinal microbiota
    (Taylor & Francis Ltd, 2007) Şamlı, Hasan Ersin; Şenköylü, Nizamettin; Koç, Fisun; Kanter, Mehmet; Ağma Okur, Aylin
    The experiment was conducted to study the effects of supplementing a broiler starter diet with the probiotic Enterococcus faecium NCIMB 10415 and dried whey ( 80% lactose) on chick performance, gut histomorphology and intestinal microbiota. One-day-old male Ross 308 strain broiler chickens were fed diets containing: (i) control feed, (ii) control +3.5% dried whey, (iii) control +0.2% E. faecium, and (iv) control +3.5% dried whey +0.2% E. faecium. Birds were maintained in battery brooders confined in an environmentally controlled experimental room. The experiment lasted for 21 days. Birds fed E. faecium or E. faecium + dried whey exhibited significantly improved weight gain and feed conversion rate (FCR). Weight gain and FCR of treatment groups 1-4 were 628.7, 657.8, 690.9, 689.3 and 1.218, 1.193, 1.107, 1.116, respectively. Lactic acid bacteria counts in both the ileal content and excreta were significantly affected by dietary treatment. Supplementation of the E. faecium and dried whey separately and in combination increased lactic acid bacteria colonization in the ileal content from 4.2 to 5.0, 7.8 and to 5.1 log cfu/g, respectively (treatments 1 - 4). Similarly, supplementation of dried whey and E. faecium separately and in combination increased lactic acid bacteria in the excreta from 5.3 to 5.5, 8.0 and to 7.2 log cfu/g, respectively. Addition of the probiotic E. faecium increased villus height in the ileum (p < 0.05). Thus, supplementation of E. faecium enhanced broiler chick performance with respect to weight gain and FCR. No additive effect of E. faecium and dried whey was detected. Further studies are needed to investigate the relationship between E. faecium and dried whey with respect to gut histomorphology.
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    Effects of experimental diabetes on testis proliferations and apoptosis in rats
    (2011) Aktaş, Cevat; Kanter, Mehmet; Erbo?a, Mustafa; Timurkan, Hüseyin
    This work aimed to investigate the role of diabetes on cell proliferation, and apoptosis in testis. The rats were randomly allotted into one of two experimental groups: control and diabetic group; each group contain 10 animals. Diabetes was induced by a single intraperitoneal injection of STZ (50 mg/kg). Testicular damage was examined by using hematoxylin and eosin, immunohistochemical staining of proliferating cell nuclear antigen (PCNA), and apoptosis was determined by terminal-deoxynucleotidyl-transferase mediated dUTP nick end labeling (TUNEL). Potential disorders associated with seminiferous tubular sperm formation were evaluated using the Johnsen score. The mean seminiferous tubule diameter (MSTD) and mean testicular biopsy score (MTBS) values were significantly decreased in diabetic group was compared to the control group. Our data indicate a significant reduction in the expression of PCNA and an enhancement in the activity of TUNEL in testis tissues of the diabetic group. The effects of diabetes on spermatogenesis can be clearly detected as a testicular cell death and decrease in MTBS, MSTD, and PCNA expression. © 2011 OMU All rights reserved.
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    Effects of Urtica dioica on oxidative stress, proliferation and apoptosis after partial hepatectomy in rats
    (Sage Publications Inc, 2015) Oğuz, Serhat; Kanter, Mehmet; Erboğa, Mustafa; Toydemir, Toygar; Sayhan, Mustafa Burak; Onur, Hatice
    The present study was performed to investigate the effect of Urtica dioica (UD) on liver regeneration after partial hepatectomy (PH) in rats. A total of 24 male Sprague Dawley rats were divided into three groups: sham-operated, PH and PH+UD; each group contains eight animals. The rats in UD-treated groups were given UD oils (2ml/kg/day) once a day orally for 7days starting 3days prior to hepatectomy operation. At day 7 after resection, liver samples were collected. The levels of malondialdehyde (MDA), superoxide dismutase (SOD) and glutathione (GSH) were estimated in liver homogenates. Moreover, histopathological examination, mitotic index (MI), proliferating cell nuclear antigen labeling, proliferation index (PI), transferase-mediated deoxyuridine triphosphate nick end-labeling assay, apoptotic index (AI) were evaluated at day 7 after hepatectomy. As a result, UD significantly increased MI and PI, significantly decreased AI and also attenuated hepatic vacuolar degeneration and sinusoidal congestion in PH rats. UD treatment significantly decreased the elevated tissue MDA level and increased the reduced SOD activity and GSH level in the tissues. These results suggest that UD pretreatment was beneficial for rat liver regeneration after partial hepatectomy.
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    Effects of whole wheat with or without xylanase supplementation on performance of layers and digestive organ development
    (Assoc Sci Produzione Animale-Aspa, 2009) Şenköylü, Nizamettin; Şamlı, Hasan Ersin; Akyürek, Hasan; Ağma Okur, Aylin; Kanter, Mehmet
    An experiment was conducted using Bovans White layers to investigate the effects of 30% whole-wheat inclusion in a standard layer diet supplemented with xylanase, on laying performance, digestive organs and ileal mucosa development. Three dietary treatments were used: 1) control diet (30% ground wheat); 2) 30% whole wheat; 3) whole wheat+wheat xylanase. Xylanase was added to whole wheat at 150g/ton. Including the pre-experimental period the trial lasted for 13 weeks. Xylanase supplementation to whole wheat significantly (P<0.05) improved egg production and feed conversion rate compared to the ground wheat and whole wheat fed groups. Gizzard pH was not affected by dietary treatments, while whole wheat feeding significantly (P<0.05) reduced jejuno-ileal pH and increased gizzard and jejuno-ileal viscosity compared to the ground wheat fed and xylanase supplemented groups. Proventriculus, gizzard, duodenum, jejunum, ileum, caecum, colon and liver weights were not significantly affected by dietary treatments. Feeding whole wheat w/wo xylanase supplementation significantly (P<0.05) increased crypt depth but did not affect lamina muscularis mucosae thickness.
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    Heat stress decreases testicular germ cell proliferation and increases apoptosis in short term: an immunohistochemical and ultrastructural study
    (Sage Publications Inc, 2013) Kanter, Mehmet; Aktaş, Cevat; Erboğa, Mustafa
    Scrotal hyperthermia has been known as a cause of male infertility but the exact mechanism leading to impaired spermatogenesis is unknown. This work was aimed to investigate the role of scrotal hyperthermia on cell proliferation and apoptosis in testes. The rats were randomly allotted into one of the four experimental groups: A (control), B (1 day after scrotal hyperthermia), C (14 days after scrotal hyperthermia), and D (35 days after scrotal hyperthermia); each group comprised 7 animals. Scrotal hyperthermia was carried out in a thermostatically controlled water bath at 43 degrees C for 30 min once daily for 6 consecutive days. Control rats were treated in the same way, except the testes were immersed in a water bath maintained at 22 degrees C. Hyperthermia-exposed rats were killed under 50 mg/kg ketamine anaesthesia and tissue samples were obtained for biochemical and histopathological investigations. Hyperthermia treatment significantly decreased the testicular antioxidant system, including decreases in the glutathione level, superoxide dismutase, and glutathione peroxidase activities. Moreover, exposure to hyperthermia resulted in lipid peroxidation increase in testes. Our data indicate a significant reduction in the expression of proliferating cell nuclear antigen and an enhancement in the activity of terminal deoxynucleotidyl transferase dUTP nick end labelling after scrotal hyperthermia. In scrotal hyperthermia, the mitochondrial degeneration, dilatation of smooth endoplasmic reticulum, and enlarged intercellular spaces were observed in both Sertoli and spermatid cells. Scrotal hyperthermia is one of the major factors that impair spermatogenesis in testis. This heat stress is shown to be closely associated with oxidative stress, followed by apoptosis of germ cells.
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    Immunohistochemical investigation of caspase-3 in neuronal apoptosis after experimental closed head trauma
    (2011) Aktaş, Cevat; Kanter, Mehmet; Uzun, Duygu; Fidanol Erboğa, Zeynep
    The aim of this study was to investigate the caspase-3 activity in neuronal apoptosis after experimental closed head trauma model in rats. Twenty adult male rats were randomly divided into two groups: control and trauma groups. In trauma group, a cranial impact was delivered to the skull from a height of 7 cm at a point just in front of the coronal suture and over the right hemisphere. Rats were sacrificed at 12 hours after the onset of injury. Brain tissues were removed for histopathological investigation. In the trauma group, the neurons became extensively dark and degenerated into picnotic nuclei. The number of apoptotic neurons in frontal cortex tissue of trauma group was significantly more than control groups. In conclusion, the caspase 3 immunopositivity was increased in degenerating neurons of the frontal cortex tissue following trauma. The present results indicate that closed head trauma caused degenerative changes and increased caspase 3 immonupositivity in neurons. © 2011 OMU All rights reserved.
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    Influence of a combination of formic and propionic acids added to wheat- and barley-based diets on the performance and gut histomorphology of broiler chickens
    (Akademiai Kiado Zrt, 2007) Şenköylü, Nizamettin; Şamlı, H. E.; Kanter, Mehmet; Ağma, Aylin
    Day-old male chicks were used to test the effects of a combination of formic and propionic acids (CFP) added to wheat- and barley-based diets on the performance and gut histomorphology of broilers. The CFP, containing formic and propionic acids based on an inorganic phyllo-silicate carrier, was added to starter and grower broiler diets of standard (NRC, 1994) or lower nutrient density (LND) using different levels of wheat and barley. Body weight gain (BWG) and feed conversion ratio (FCR) of broiler chicks were significantly (P < 0.001) improved by CFP supplementation at 21 days of age regardless of nutrient density (ND). However, at 35 days of age CFP addition significantly (P < 0.001) increased BWG and FCR. Proventriculus weight was also significantly affected by the dietary treatments. Ileal viscosity was significantly (P < 0.05) affected by ND which was associated with wheat and barley contents, whereas feed viscosity was significantly (P < 0.05) affected by CFP supplementation. Villus height was significantly (P < 0.05) increased by the CFP supplementation. In the case of villus width, an interaction effect was observed: there was a significant (P < 0.05) decrease in the group fed the standard ND diet, but only a numerical decrease in the group fed the LND diet compared to control group. No significant effect of dietary treatment on the thickness of the lamina muscularis mucosae could be detected.
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    Melatonin attenuates oxidative stress, liver damage and hepatocyte apoptosis after bile-duct ligation in rats
    (Sage Publications Inc, 2014) Aktaş, Cevat; Kanter, Mehmet; Erboğa, Mustafa; Mete, Rafet; Oran, Mustafa
    The goal of this study was to evaluate the possible protective effects of melatonin against cholestatic oxidative stress, liver damage and hepatocyte apoptosis in the common rats with bile duct ligation (BDL). A total of 24 male Wistar albino rats were divided into three groups: control, BDL and BDL + received melatonin; each group contains eight animals. Melatonin-treated BDL rats received daily melatonin 100 mg/kg/day via intraperitoneal injection. The application of BDL clearly increased the malondialdehyde (MDA) levels and decreased the superoxide dismutase (SOD) and glutathione (GSH) activities. Melatonin treatment significantly decreased the elevated tissue MDA levels and increased the reduced SOD and GSH enzyme levels in the tissues. The changes demonstrate that the bile duct proliferation and fibrosis in expanded portal tracts include the extension of proliferated bile ducts into lobules, mononuclear cells and neutrophil infiltration into the widened portal areas as observed in the BDL group. The data indicate that melatonin attenuates BDL-induced cholestatic liver injury, bile duct proliferation and fibrosis. The alpha-smooth muscle actin (alpha-SMA) and terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL)-positive cells in the BDL were observed to be reduced with the melatonin treatment. These results suggest that administration of melatonin is a potentially beneficial agent to reduce liver damage in BDL by decreasing oxidative stress.
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    Morphological investigation of alcohol-induced hepatocyte apoptosis and liver injury in rats
    (2011) Aktaş, Cevat; Kanter, Mehmet; Dönmez, Yeliz Bozdemir; Öztürk, Şamil
    The aim of this study was to morphologicall investigation of alcohol-induced hepatocyte apoptosis and liver injury in rats. A total of 20 male Sprague-Dawley rats were divided into two groups: control, and alcohol treated; each group contain 10 animals. The rats in alcohol treated group was given a daily dose of 6 g/kg ethanol by using intragastric intubation. Control group was given the same volume of saline. This application was continued daily for a total of 6 weeks. The end of the experiment all animals were anesthetized. The anesthetized rats were sacrificed and liver tissues were removed for histopathological investigation. Liver damage was examined by using hematoxylin-eosin and apoptosis was determined by terminal-deoxynucleotidyl- transferase mediated dUTP nick end labeling (TUNEL). There existed hepatocyte diffuse steatosis and hemorrhage in alcohol treated group. Our data indicate an enhancement in the activity of TUNEL in hepatocyte apoptosis of the alcholol treated group. The effects of alcohol on liver can be clearly detected as a hepatocyte cell death and liver injury. © 2011 OMU All rights reserved.
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    Neuroprotective effect of quercetin against oxidative damage and neuronal apoptosis caused by cadmium in hippocampus
    (Sage Publications Inc, 2016) Kanter, Mehmet; Ünsal, Cüneyt; Aktaş, Cevat; Erboğa, Mustafa
    The purpose of the present investigation was to evaluate cadmium (Cd)-induced neurotoxicity in hippocampal tissues and beneficial effect of quercetin (QE) against neuronal damage. A total of 30 male rats were divided into 3 groups: control, Cd-treated, and Cd + QE-treated groups. After the treatment, the animals were killed and hippocampal tissues were removed for biochemical and histopathological investigation. Cd significantly increased tissue malondialdehyde (MDA) and protein carbonyl (PC) levels and also decreased superoxide dismutase (SOD) and catalase (CAT) enzyme activities in hippocampal tissue compared with the control. Administration of QE with Cd significantly decreased the levels of MDA and PC and significantly elevated the levels of antioxidant enzymes in hippocampal tissue. In the Cd-treated group, the neurons of both tissues became extensively dark and degenerated with pyknotic nuclei. The morphology of neurons in Cd + QE group was well protected, but not as neurons of the control group. The caspase-3 immunopositivity was increased in degenerating neurons of the Cd-treated group. Treatment of QE markedly reduced the immunoreactivity of degenerating neurons. The results of the present study show that QE therapy causes morphologic improvement in neurodegeneration of hippocampus after Cd exposure in rats.