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Accumulation of alpha-Synuclein in Cerebellar Purkinje Cells of Diabetic Rats and Its Potential Relationship with Inflammation and Oxidative Stress Markers
(Hindawi Publishing Corp, 2017) Solmaz, Volkan; Ozlece, Hatice Kose; Eroglu, Huseyin Avni; Aktug, Huseyin; Erbas, Oytun; Taskiran, Dilek
Objective. The present study was conducted to evaluate the relationship between plasma oxidative stress markers such as malondialdehyde (MDA) and glutathione (GSH), inflammatory marker pentraxin-3 (PTX3), and cerebellar accumulation of alpha-synuclein in streptozotocin-(STZ-) induced diabetes model in rats. Methods. Twelve rats were included in the study. Diabetes (p = 6) was induced with a single intraperitoneal injection of streptozotocin (STZ, 60 mg/kg). Diabetes was verified after 48 h by measuring blood glucose levels. Six rats served as controls. Following 8 weeks, rats were sacrificed for biochemical and immunohistochemical evaluation. Results. Plasma MDA levels were significantly higher in diabetic rats when compared with the control rats (p < 0.01), while plasma GSH levels were lower in the diabetic group than in the control group (p < 0.01). Also, plasma pentraxin-3 levels were statistically higher in diabetic rats than in the control rats (p < 0.01). The analysis of cerebellar alpha-synuclein immunohistochemistry showed a significant increase in alpha-synuclein immunoexpression in the diabetic group compared to the control group (p < 0.01). Conclusion. Due to increased inflammation and oxidative stress in the chronic period of hyperglycemia linked to diabetes, there may be alpha-synuclein accumulation in the cerebellum and the plasma PTX3 levels may be assessed as an important biomarker of this situation.
Amelioration of rotenone-induced dopaminergic cell death in the striatum by oxytocin treatment
(Elsevier Science Inc, 2012) Erbas, Oytun; Oltulu, Fatih; Taskiran, Dilek
Oxytocin (OT) is essentially associated with uterine contraction during parturition and milk ejection reflex. Although several studies implicate the role of OT in anti-inflammatory, anti-oxidative and anti-apoptotic pathways, there is a lack of data with regard to the protective effects of oxytocin in neurodegenerative models such as Parkinson's disease (PD). The present study was undertaken to investigate the neuroprotective effects of oxytocin (OT) on rotenone-induced PD in rats. Twenty adult Sprague-Dawley rats were injected with rotenone (3 mu g/mu l in DMSO) or vehicle (1 mu l DMSO) into the left substantia nigra pars compacta (SNc) and ventral tegmental area (VTA) under stereotaxic surgery, and PD model was assessed by rotational test ten days after drug infusion. The valid PD rats were randomly divided into two groups; Group 1 (n = 7) and Group 2 (n = 7) were administered saline (1 ml/kg/day, i.p.) and oxytocin (160 mu g/kg/day, i.p.) through 20 days, respectively. The effects of OT treatment were evaluated by behavioral, histological and immunohistochemical parameters. Apomorphine-induced stereotypic rotations in PD rats were significantly inhibited by OT treatment (p < 0.05). In addition, immunohistochemical studies clearly demonstrated the suppression of Bax, caspase-3, caspase-8 and elevation of Bcl-2 and tyrosine hydroxylase immunoexpression in OT-treated rats compared to saline group. Our findings suggest that oxytocin may have cytoprotective and restorative effects on dopaminergic neurons against rotenone-induced injury. The underlying mechanism may be associated with the inhibition of apoptotic pathways. (C) 2012 Elsevier Inc. All rights reserved.
Antipsychotic-Like Effect of Trimetazidine in a Rodent Model
(Hindawi Ltd, 2013) Erbas, Oytun; Akseki, Huseyin Serdar; Elikucuk, Betul; Taskiran, Dilek
Trimetazidine (TMZ) has been used as an anti-ischemic agent for angina pectoris, chorioretinal disturbances, and vertigo. Also, it can induce extrapyramidal type adverse reaction such as parkinsonism, gait disorder, and tremor via blockade of D2 receptors. In the present study, we evaluated the effect of TMZ on novelty-induced rearing behavior and apomorphine-induced stereotypy behavior in male rats. Four groups of rat (n = 7) were administrated with TMZ (10 and 20 mg/kg, i.p.), chlorpromazine (1 mg/kg, i.p.), or isotonic saline. One hour later, apomorphine (2 mg/kg, s.c.) was administrated to each rat. Our results showed that both doses of TMZ significantly decreased the rearing behavior in rats, whereas the decrease with chlorpromazine was higher. TMZ also decreased the stereotypy scores in a dose-dependent manner. We concluded that TMZ has beneficial effects on rearing behavior and stereotypy, which are accepted to be indicators of antipsychotic effect. Taken together, with its antioxidative and cytoprotective properties, TMZ is worthy of being investigated for its anti-psychotic effects as a primary or an adjunctive drug.
The association between seizure predisposition and inflammation in a rat model of fatty liver disease
(Springer-Verlag Italia Srl, 2014) Aksoy, Durdane; Solmaz, Volkan; Taskiran, Dilek; Erbas, Oytun
The association between inflammation and the induction of seizures is well-known. It has been reported that non-alcoholic fatty liver disease (NAFLD) is associated with a pro-inflammatory state, and systemic inflammation may trigger central nervous system inflammation. This study aims to identify the impact of inflammation in a rat model of fatty liver on the propensity and severity of pentylenetetrazol (PTZ)-induced seizures. Twenty-four male Sprague-Dawley rats were divided into four groups. Groups 1 and 2 were administered a 35 % fructose solution over 8 weeks to induce the development of fatty liver while Groups 3 and 4 were fed normally as controls. Groups 1 and 3 were given 70 mg/kg PTZ, determining Racine Convulsion Scores (RCS) and onset times of the first myoclonic jerks (FMJ). Groups 2 and 4 were administered 35 mg/kg of PTZ, then EEG recordings were obtained to evaluate spike percentages. TNF-alpha levels in brain and liver tissues were also measured. While RCS's of fatty liver rats were higher than the control group (p > 0.05) as well as spike percentages (p < 0.05), FMJ onset time was significantly shorter. TNF-alpha levels in liver and brain tissues of the rats with NAFLD were significantly higher than the control rats. We found that rats with NAFLD demonstrated decreased seizure thresholds, possibly due to increased cytokine levels systemically and within the central nervous system. As such, epilepsy patients taking medications that may predispose the development of NAFLD must be carefully managed to prevent the possibility of increased seizure episodes.
Attenuation of Ischemia/Reperfusion-Induced Ovarian Damage in Rats: Does Edaravone Offer Protection?
(Karger, 2013) Ergenoglu, Mete; Erbas, Oytun; Akdemir, Ali; Yeniel, Ahmet Ozgur; Yildirim, Nuri; Oltulu, Fatih; Aktug, Huseyin; Taskiran, Dilek
Aim: The aim of this study was to investigate whether prophylactic treatment with edaravone prevents ischemia/reperfusion (I/R)-induced ovarian damage during pneumoperitoneum in an experimental rat model. Methods: Twenty-eight female Sprague Dawley rats were allocated randomly to 4 groups. The sham group (group 1) was only subjected to catheter insertion, not to pneumoperitoneum. Group 2 received a 1 mg/kg dose of 0.9% sodium chloride by the intraperitoneal route for 10 min before pneumoperitoneum. Groups 3 and 4 received 6 and 12 mg/kg edaravone, respectively, by the intraperitoneal route for 10 min before pneumoperitoneum. After 60 min of pneumoperitoneum, the gas was deflated. Immediately after the reperfusion period, both ovaries were excised for histological scoring, caspase-3 immunohistochemistry and biochemical evaluation including glutathione (GSH) and malondialdehyde (MDA) levels. Also, total antioxidant capacity (TAC) was measured in plasma samples to evaluate the antioxidant effect of edaravone. Results: Ovarian sections in the saline group revealed higher scores for follicular degeneration and edema (p < 0.0001) when compared with the sham group. Administration of different doses of edaravone in rats significantly prevented degenerative changes in the ovary (p < 0.0001). Caspase-3 expression was only detected in the ovarian surface epithelium in all groups, and there was a significant difference between the treatment groups and the saline group (p < 0.0001). Treatment of rats with edaravone reduced caspase-3 expression in a dose-dependent manner. Moreover, biochemical measurements of oxidative stress markers (MDA, GSH and TAC) revealed that prophylactic edaravone treatment attenuated oxidative stress induced by I/R injury. Conclusion: These results indicate that prophylactic treatment with edaravone prevents I/R-induced ovarian damage during pneumoperitoneum in an experimental rat model. (C) 2013 S. Karger AG, Basel
The Beneficial Effects of Levetiracetam on Polyneuropathy in the Early Stage of Sepsis in Rats: Electrophysiological and Biochemical Evidence
(Informa Healthcare, 2013) Erbas, Oytun; Yeniel, A. Ozgur; Akdemir, Ali; Ergenoglu, A. Mete; Yilmaz, Mustafa; Taskiran, Dilek; Peker, Gonul
Critical illness polyneuropathy (CIP) is a common complication in long (>= 1 week) critical/intensive care hospitalizations. Rapidly progressing atrophy and weakness of the limb, trunk and, particularly, respiratory muscles may lead to severe morbidity or mortality. The aim of the present study was to investigate the protective effects of levetiracetam (LEV) on CIP in the early stage of sepsis in rats. We simulated CIP by a surgically induced sepsis model and verified it by lower-limb lectromyography (EMG) (amplitude and duration of CMAP, and distal latency). We evaluated the effects of various doses of LEV treatment (300, 600, and 1200 mg/kg i.p.) on CIP by performing electrophysiology, and determining plasma tumor necrosis factor (TNF)-alpha, lipid peroxides (malondialdehyde, MDA) levels, and total antioxidant capacity (TAC). Our data showed: (1) significant suppression of CMAP amplitude and prolongation of distal latency in the saline-treated sepsis group, and distal latency as well as CMAP amplitudes benefiting best from the 600 mg/kg LEV treatment; (2) significant rise in plasma TNF-alpha and MDA levels in the saline-treated sepsis group, but significant ameliorations by the 600 and 1200 mg/kg LEV treatment; (3) highly significant suppression of TAC in the saline-treated group, but profound reversals in all LEV-treated groups. We conclude that 300, 600, and 1200 mg/kg i.p. doses of post-septic treatment by LEV has possibly acted in a dose-dependent manner to both protect and restore the affected peripheral nerves' axon and myelin following surgical disturbance of the cecum to induce sepsis and consequent polyneuropathy.
Capsaicin induced apoptosis and gene expression dysregulation of human acute lymphoblastic leukemia CCRF-CEM cells
(Imprimatur Publications, 2014) Cetintas, Vildan Bozok; Kaymaz, Burcin Tezcanli; Aktug, Huseyin; Oltulu, Fatih; Taskiran, Dilek
Purpose: Capsaicin, an ingredient of red chili pepper, has possible tumorigenicity/genotoxicity properties. We aimed to determine the effects of capsaicin on the proliferation and gene expression profiles of acute lymphoblastic leukemia (ALL) CCRF-CEM cell line. Methods: Cell viability and IC50 dose was determined by WST cytotoxicity assay. qRT-PCR, immunohistochemical staining and western blot methods were used to determine target genes' expression levels, Apoptosis was evaluated by measuring the caspase-3 activity. Results: Capsaicin inhibited the proliferation of CCRF-CEM cells in a dose-dependent manner. Increased mRNA expressions of caspase gene family members, activated caspase-3 and decreased mRNA and protein expression of BCL-2 gene indicated apoptotic response to capsaicin. Moreover capsaicin treatment suppressed significantly the expression of the key cell signaling pathways of KRAS, AKT, GAB2, PTPN11, BRAF, INPP5D, MAPK7. Conclusion: Capsaicin induces apoptosis in CCRF-CE.M cells and this response is associated with downregulation of cell signaling pathways.
Cholecalciferol (vitamin D 3) improves cognitive dysfunction and reduces inflammation in a rat fatty liver model of metabolic syndrome
(Pergamon-Elsevier Science Ltd, 2014) Erbas, Oytun; Solmaz, Volkan; Aksoy, Durdane; Yavasoglu, Altug; Sagcan, Mustafa; Taskiran, Dilek
Aim: The aim of this study was to examine the effects of cholecalciferol on systemic inflammation and memory in the setting of fatty liver disease in rats. Materials and methods: To induce the development of fatty liver disease, the rats were fed a 35% fructose solution over 8 weeks. Group I (n = 6) was designated as the control group and fed with standard rat chow. Group II (n = 6) was provided with, standard rat chow, and 03 mu g/kg/day of oral cholecalciferol over a duration of 2 weeks. In addition to standard rat chow, group III (n = 6) and group IV (n = 6) were given 4 mL of the 35% fructose solution per day via oral gavage for 8 weeks. However, group IV was also given 03 mu g/kg/day of oral cholecalciferol over 2 weeks. After the treatment period, passive avoidance tasks were performed by all groups. The liver and brain were harvested for subsequent biochemical and histopathologic analyses. Key findings: The development of fatty liver extends the memory latency period of passively avoiding tasks after I trial. Moreover, there were increases in brain TNF-alpha and plasma MDA levels according to two-way analysis of variance. Cholecalciferol supplementation decreased the latency period of passively avoiding tasks in rats with hepatosteatosis, and also significantly reduced brain TNF-alpha and plasma MDA levels. Significance: Fatty liver may contribute to the development of systemic inflammation, which affects cognition and causes deficits in memory; however, the anti-inflammatory and antioxidant properties of vitamin D may improve the cognitive function of rats with hepatosteatosis. (C) 2014 Elsevier Inc. All rights reserved.
Comparison of melatonin and oxytocin in the prevention of critical illness polyneuropathy in rats with experimentally induced sepsis
(Academic Press Inc Elsevier Science, 2013) Erbas, Oytun; Ergenoglu, Ahmet Mete; Akdemir, Ali; Yeniel, Ahmet Ozgur; Taskiran, Dilek
Background: Critical illness polyneuropathy is an acute neuromuscular disorder of critically ill patients and is characterized by limb and respiratory muscle weakness. The purpose of the study was to evaluate the neuroprotective effects of melatonin (MEL) and oxytocin (OT) on the early stage of sepsis by recording compound muscle action potentials and measuring plasma tumor necrosis factor (TNF)-alpha levels, lipid peroxidation (malondialdehyde; MDA), and total antioxidant capacity. Materials and methods: One hundred adult male Sprague-Dawley rats were included in the study. The cecal ligation and puncture (CLP) procedure was performed to induce the sepsis model. MEL (10, 20, and 40 mg/kg), OT (0.4, 0.8, and 1.6 mg/kg), and a combination of MEL (20 mg/kg) and OT (0.8 mg/kg) were administered intraperitoneally in the first hour of surgery. Electromyography (EMG) studies were achieved 24 h after CLP surgery and then blood samples were collected for biochemical measurements. Results: EMG findings revealed that compound muscle action potential amplitude was significantly decreased and distal latency was prolonged in the CLP group compared with the sham group (P < 0.05 and P < 0.0005). Moreover, the animals that received CLP surgery showed significantly higher TNF-alpha and MDA levels and lower total antioxidant capacity values than the sham group. The administration of MEL and OT to rats significantly abolished the EMG alterations and suppressed oxidative stress and TNF-alpha release in CLP-induced rats. Conclusions: The inflammatory processes and imbalance in oxidative/antioxidative status play important roles in the pathogenesis of critical illness polyneuropathy. We suggest that both oxytocin and melatonin may have beneficial effects against sepsis-induced polyneuropathy in critical illness. (C) 2013 Elsevier Inc. All rights reserved.
Comparison of montelukast and cabergoline for prevention of ovarian hyperstimulation syndrome: in an experimental rat model
(Taylor & Francis Ltd, 2015) Akman, Levent; Sahin, Gulnaz; Erbas, Oytun; Aktug, Huseyin; Akdogan, Aysin; Goker, Ege Nazan Tavmergen; Taskiran, Dilek; Tavmergen, Erol
Ovarian hyperstimulation syndrome (OHSS) is a serious iatrogenic complication that can occur during assisted reproductive techniques. The aim of this study is to investigate the effects of the leukotriene receptor antagonist (montelukast) treatment in prevention of OHSS and compare to cabergoline treatment. Twenty-four immature female Wistar rats were assigned to four groups. Group 1 was the control group. In the rennaning three groups, OHSS was induced through ovarian stimulation with gonadotropins. No treatment was given to Group 2. Group 3 was administered a low-dose 100 mg/kg cabergoline treatment and Group 4 was received 20 mg/kg montelukast. Body weight, ovarian weight, vasculary permability (VP), peritoneal fluid vascular endothelial growth factor (VEGF) values and VEGF immune-expression were compared between the groups. Both cabergoline and montelukast prevented progression of OHSS compared to the OHSS group. Body weight, ovarian weight, VP, peritoneal fluid VEGF values and VEGF expression were significantly lower in both cabergoline- and montelukast-treated rats than in those not treated OHSS group. In conclusion, montelukast is an effective option for prevention of OHSS, as well as cabergoline. Montelukast may be a new treatment option to prevent and control the OHSS.
Comparison of montelukast and cabergoline for prevention of ovarian hyperstimulation syndrome: in an experimental rat model
(Taylor & Francis Ltd, 2015) Akman, Levent; Sahin, Gulnaz; Erbas, Oytun; Aktug, Huseyin; Akdogan, Aysin; Goker, Ege Nazan Tavmergen; Taskiran, Dilek; Tavmergen, Erol
Ovarian hyperstimulation syndrome (OHSS) is a serious iatrogenic complication that can occur during assisted reproductive techniques. The aim of this study is to investigate the effects of the leukotriene receptor antagonist (montelukast) treatment in prevention of OHSS and compare to cabergoline treatment. Twenty-four immature female Wistar rats were assigned to four groups. Group 1 was the control group. In the rennaning three groups, OHSS was induced through ovarian stimulation with gonadotropins. No treatment was given to Group 2. Group 3 was administered a low-dose 100 mg/kg cabergoline treatment and Group 4 was received 20 mg/kg montelukast. Body weight, ovarian weight, vasculary permability (VP), peritoneal fluid vascular endothelial growth factor (VEGF) values and VEGF immune-expression were compared between the groups. Both cabergoline and montelukast prevented progression of OHSS compared to the OHSS group. Body weight, ovarian weight, VP, peritoneal fluid VEGF values and VEGF expression were significantly lower in both cabergoline- and montelukast-treated rats than in those not treated OHSS group. In conclusion, montelukast is an effective option for prevention of OHSS, as well as cabergoline. Montelukast may be a new treatment option to prevent and control the OHSS.
Comparison of montelukast and cabergoline for prevention of ovarian hyperstimulation syndrome: in an experimental rat model
(Taylor & Francis Ltd, 2015) Akman, Levent; Sahin, Gulnaz; Erbas, Oytun; Aktug, Huseyin; Akdogan, Aysin; Goker, Ege Nazan Tavmergen; Taskiran, Dilek; Tavmergen, Erol
Ovarian hyperstimulation syndrome (OHSS) is a serious iatrogenic complication that can occur during assisted reproductive techniques. The aim of this study is to investigate the effects of the leukotriene receptor antagonist (montelukast) treatment in prevention of OHSS and compare to cabergoline treatment. Twenty-four immature female Wistar rats were assigned to four groups. Group 1 was the control group. In the rennaning three groups, OHSS was induced through ovarian stimulation with gonadotropins. No treatment was given to Group 2. Group 3 was administered a low-dose 100 mg/kg cabergoline treatment and Group 4 was received 20 mg/kg montelukast. Body weight, ovarian weight, vasculary permability (VP), peritoneal fluid vascular endothelial growth factor (VEGF) values and VEGF immune-expression were compared between the groups. Both cabergoline and montelukast prevented progression of OHSS compared to the OHSS group. Body weight, ovarian weight, VP, peritoneal fluid VEGF values and VEGF expression were significantly lower in both cabergoline- and montelukast-treated rats than in those not treated OHSS group. In conclusion, montelukast is an effective option for prevention of OHSS, as well as cabergoline. Montelukast may be a new treatment option to prevent and control the OHSS.
Comparison of the Effects of Extracorporeal Irradiation and Liquid Nitrogen on Nerve Recovery in a Rat Model
(Taylor & Francis Inc, 2019) Kaya, Huseyin; Sabah, Dundar; Kececi, Burcin; Kucuk, Levent; Erbas, Oytun; Oltulu, Fatih; Taskiran, Dilek
Aim of the study: Biologic reconstruction using tumor-bearing bone autografts devitalized by liquid nitrogen or extracorporeal irradiation (oncological sterilization) is a safe and effective method in musculoskeletal surgery. the purpose of this study was to examine the effects of these two oncological sterilization methods on nerve recovery. Methods: A total of 48 rats were randomly divided into 3 groups as autograft, irradiation and liquid nitrogen groups. A nerve defect created in the right sciatic nerve was reconstructed with an autograft obtained from the nerve itself. Group I underwent reconstruction with standard nerve autograft. Group II and Group III underwent reconstruction with devitalized nerve autograft treated through extracorporeal irradiation and liquid nitrogen, respectively. the left sciatic nerves of the rats served as control. Electromyography, motor function test and histomorphological analysis were performed to assess the nerve recovery on the 3rd (early stage) and 4th months (late stage). Results: Electrophysiological assessment revealed better results in irradiation group compared with liquid nitrogen group in terms of myelinization and axonal regeneration. Motor performance of the autograft group was slightly better than the other groups. Histologically, autograft group demonstrated better results compared with other groups. Late-stage assessments revealed high rates of myelinization in the graft segment in liquid nitrogen group and in the segment distal to the graft in irradiation group. Conclusions: This study has demonstrated that nerve autografts treated by oncological sterilization methods may be used for nerve reconstruction in limb salvage surgery. However, further studies are needed to clarify the applicability of these methods.
The diagnostic utility of scintigraphy in esophageal burn: a rat model
(Academic Press Inc Elsevier Science, 2016) Ciftci, Oznur Dilek; Gul, Serdar Savas; Aciksari, Kurtulus; Maman, Adem; Cavusoglu, Turker; Bademci, Refik; Taskiran, Dilek; Erbas, Oytun
Background: Corrosive esophageal injury due to accidental ingestion is a serious clinical problem in children particularly in developing countries. The present study was conducted to evaluate the diagnostic utility of technetium-99m-pyrophosphate (Tc-99m-PYP) scintigraphy in the early stage of esophageal burns by using different concentrations of sodium hydroxide (NaOH) in an experimental rat model. Materials and methods: Twenty-eight male Spraguee-Dawley rats, weighing 200-250 g, were used in the study. Esophageal burn model was created in 21 rats by gastrically infusion of various concentrations of NaOH. The rats were divided randomly into three groups: mildburn group (n = 7) received 15% NaOH, moderate-burn group (n = 7) received 30% NaOH and severe-burn group (n = 7) received 45% NaOH. Seven rats were identified as control group and received normal saline. Three hours after burn injury, 1-mCi Tc-99m-PYP was administered through tail vein. Two hours after Tc-99m-PYP administration, static imaging with gamma camera was performed. Then, histopathologic assessment of esophageal samples was achieved properly. Results: All NaOH-applied groups (mild, moderate, and severe) showed a significant higher uptake ratio when compared to control group (P < 0.005). NaOH-applied groups displayed important histologic alterations such as mucosal disintegration, edema, inflammation, and stromal damage when compared to control group. Pearson correlation analysis revealed a significant correlation between the Tc-99m-PYP uptake ratio and histologic score (P < 0.0005). Conclusions: The scintigraphic imaging may provide advantages in the early stage of esophageal burns in some patients whom endoscopic procedure is contraindicated because of its high risk of complications such as bleeding and perforation. (C) 2016 Elsevier Inc. All rights reserved.
The Effect of Cisplatin Toxicity and Capsaicin on Electron Transport Chain in Liver and Kidney of Sprague Dawley Rats
(Humana Press Inc, 2014) Kursunluoglu, Gizem; Kayali, Hulya Ayar; Taskiran, Dilek
Cisplatin accumulates in mitochondria, which is a potent and widely used chemotherapeutic agent. In order to clarify the potential effect of cisplatin on electron transport chain (ETC), the variation of succinate dehydrogenase (SDH) and cytochrome c oxidase (COX) enzyme activities, nucleotide levels, as well as catalase (CAT) enzyme and membrane lipid peroxidation (LPO) level with respect to liver and kidney of cisplatin-exposed rats were studied. We found that cisplatin caused significant impairment in the SDH, COX, and CAT activities, and nucleotide levels associated with membrane LPO in isolated mitochondria. It was determined whether capsaicin, as an antioxidant, has a possible protective role on all investigated parameters of liver and kidney induced by cisplatin. The results of capsaicin + cisplatin suggest that capsaicin have antioxidant capacity to scavenge ROS to prevent membrane damage.
Effect of oxytocin treatment on explant size, plasma and peritoneal levels of MCP-1, VEGF, TNF-alpha and histopathological parameters in a rat endometriosis model
(Elsevier, 2014) Yeniel, Ahmet Ozgur; Erbas, Oytun; Ergenoglu, Ahmet Mete; Aktug, Huseyin; Taskiran, Dilek; Yildirim, Nuri; Ulukus, Murat
Objective: To determine the effects of oxytocin (OT) on surgically induced endometriosis in a rat model. Study design: Twelve female Sprague-Dawley rats were included. After the implantation and establishment of autologous endometrium onto the abdominal wall peritoneum, the rats were randomly divided into two groups, treated with intramuscular oxytocin (OT group, 160 mu g kg/day, n = 6) or isotonic NaCl solution (control group, 1 mL kg/day, n = 6) for 28 days. To evaluate the therapeutic effects of OT, the explant volumes were calculated and the levels of vascular endothelial growth factor (VEGF), monocyte chemotactic protein-1, and TNF-alpha were measured in plasma and peritoneal fluid. Endometriotic explants were examined histologically by semiquantitative analysis. Results: After treatment, the mean endometriotic explant volume was decreased in the OT group (p = 0.016). The histopathological score and VEGF immunoexpression of endometriotic explants were significantly lower in the OT group (p = 0.007) than in controls (p = 0.000). Inflammatory cytokine levels in plasma and peritoneal fluid were considerably decreased in the OT group. Moreover, TUNEL immunohistochemistry clearly demonstrated more apoptotic changes in the mononuclear cells of the OT group compared with controls. Conclusion: We suggest that oxytocin might be considered as a potential candidate therapeutic agent for endometriosis. (C) 2014 Elsevier Ireland Ltd. All rights reserved.
The Effects of Different Pressure Pneumoperitoneum Models Created By Standard or Heated-Humidified CO2 Insufflation on Ovary and Peritoneum: an Experimental Study in Rats
(Springer Heidelberg, 2022) Gunusen, Ilkben; Akdemir, Ali; Gurel, Cevik; Sargin, Asuman; Taskiran, Dilek; Kuscu, Gokce Ceren; Celik, Kubra
There is still controversy over whether structural and morphological changes can be observed in tissues depending on the carbon dioxide (CO2) nature or the applied intra-abdominal pressures (IAP). This study aimed to investigate the effects of different pressure or CO2 nature used for pneumoperitoneum in gynecological laparoscopic surgery on inflammation, DNA damage, oxidative stress, and histopathological changes in ovarian and peritoneal tissue. For this purpose, forty female rats were randomly divided into 6 groups and different pneumoperitoneum models were created in these groups. Rats in group other than control and sham groups received standard (CD) or heated-humidified CO2 (HH) insulations at low (4 mmHg) or high pressure (8 mmHg). The ovary and peritoneum sections were evaluated microscopically for apoptotic index (API) and API scoring was calculated. Tissue and plasma interleukin-6 (IL-6), tumor necrotizing factor-alpha (TNF-alpha), anti-Mullerian hormone (AMH) and 8-hydroxydeoxyguanosine (8-OHdG) levels were analyzed with enzyme-linked immunosorbent assay (ELISA). The most severe changes occurred in the 8CD group microscopically, while the least severe changes occurred in the 4HH group. All histopathological parameters except for ovarian apoptotic index and peritoneal PCNA at low pressure were higher in the CD group. TNF-alpha and 8-OHdG levels were higher in the CD group at both low and high pressures. Standard CO2 caused more prominent histopathological changes at high pressures and systemic inflammation in both pressure groups. The least change between the experimental study groups in terms of histopathological and biochemical was observed in the low-pressure heated-humidified group.
The effects of early or late treatment of osteochondral defects on joint homoeostasis: an experimental study in rabbits
(Springer, 2009) Ozsoy, Mehmet Hakan; Aydogdu, Semih; Taskiran, Dilek; Sezak, Murat; Hayran, Mutlu; Oztop, Fikri; Ozsoy, Arzu
A 3.5 x 4 mm tubular osteochondral defect was created on the right medial femoral condyles of 51 adult rabbits. In the control group (CG), defects were left untreated. In the early-(ETG) and late-(LTG) treatment groups, defects were treated by an osteoperiosteal graft 1 and 12 weeks, respectively, after the index procedure. Synovial fluid (SF) samples were collected regularly and proteoglycan fragments (PF), total collagen (TC) and collagenase (MMP-1) levels were measured. Rabbits were killed at 4 (early period), 12 (intermediate period), or 24 (late period) weeks postoperatively. Histological examination indicated a more successful healing in both grafting groups than in the CG, but without any difference at any time period between the grafting groups. In the CG, PF, and TC levels in SF increased continuously until the late period, indicating an ongoing degenerative activity in the joints. In contrast, SF marker levels in both grafting groups indicated that normalization in joint metabolism could be achieved-at least partially-after treatment. However, PF levels in the SF showed that the treatment of defects in earlier stages might result in better outcomes since the negative effects were more prominent in chronic stages, presumably due to the more prolonged period of disturbed homeostasis. Thus, histological values and SF marker levels indicated that treatment of osteochondral defects at any time of the disease had a positive effect on healing when compared to no treatment. Early treatment might better assist the recovery of joint homeostasis than late treatment.
The effects of mesenchymal stem cells on lymphoblastic leukemia cell proliferation
(Imprimatur Publications, 2014) Cetintas, Vildan Bozok; Aktug, Huseyin; Oltulu, Fatih; Keskinoglu, Ahmet; Del Castello, Buket Erer; Taskiran, Dilek
Purpose: Mesenchymal stein cells (MSCs) represent a new approach to the treatment of several neoplastic or non-neoplastic disorders. Their potential to repair damaged tissues through trans differentiation in conjunction with their immunomodulatory ability made them promising candidates for cell-based immunotherapy and regenerative medicine. In the present study, we aimed to determine the effects of MSCs on proliferation, apoptosis and gene expression profile of the acute lymphoblastic leukemia (ALL) cell line CCRF-CEM. Methods: The experiments were performed after MSCs and CCRF-CEM cells were co-cultured for 72hrs. We analyzed the gene expression patterns to predict oncogenic pathway dysregulation in the cell groups by quantitative RT-PCR and immunohistochemical staining. Results: Cell proliferation was significantly inhibited in co-cultured CCRF-CE.M cells compared to the control. Furthermore, growth factors, p53, Box and Caspase-9 expressions were increased and cell-signaling gene expressions decreased significantly. Despite increased levels of growth factors (CTGF, VEGF, FGF, EGFR), the increased apoptosis level was triggered by p53/ Bax. Conclusion: In this study we have shown that human MSCs have inhibitory effect on their neighboring malignant leukemia cells.
Evaluation of long-term effects of artificial sweeteners on rat brain: a biochemical, behavioral, and histological study
(Wiley, 2018) Erbas, Oytun; Erdogan, Mumin Alper; Khalilnezhad, Asghar; Solmaz, Volkan; Gurkan, Fulya Tuzcu; Yigitturk, Gurkan; Eroglu, Huseyin Avni; Taskiran, Dilek
The aim of the present study was to compare the effects of artificial sweeteners (aspartame, saccharin, and sucralose) on rat brain. Twenty-four adult male Sprague-Dawley rats were included in the study. The control group (n = 6) received regular tap water, whereas other groups received aspartame (3mg/kg/day, n = 6,) or saccharin (3mg/kg/day, n = 6) or sucralose (1.5mg/kg/day, n = 6) in the drinkingwater. Following 6weeks, the passive avoidance learning (PAL) test was performed to evaluate the neurobehavioral effects of sweeteners. The brains were assessed for lipid peroxides, neuron count, and Glial fibrillary acidic protein (GFAP) immunohistochemistry. Our results demonstrated that chronic intake of sweeteners significantly impaired PAL performance in all groups. Hippocampal CA1-CA3 areas revealed significantly lower neuronal count in aspartame and increased GFAP expression in all groups. Brain lipid peroxides were significantly higher in all groups. Our findings suggest that long-term consumption of artificial sweeteners may have harmful effects on cognition and hippocampal integrity in rats.

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