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Öğe A histopathological and stereological study of the effects of acetylsalicylic acid on doxorubicin-induced hepatotoxicity in mice(Taylor & Francis Ltd, 2021) Gokce, Ayse Basardi; Eren, Banu; Sagir, Dilek; Yilmaz, Burcu DemirelDoxorubicin (Dox) is an anthracycline antibiotic with antineoplastic activity. Acetylsalicylic acid (Asa) is recommended for use as a prophylactic for thromboembolism during treatment of cancers. We investigated liver toxicity due to combined use of Dox and Asa in chemotherapy regimens. We used 140 Swiss albino mice divided into four main groups: control, Dox, Asa, and Dox + Asa. Each group was subdivided into seven subgroups based on time of sacrifice, i.e., 6, 12, 24, 48 h and 7, 14, 21 days. Quantitative and histopathological changes in liver were assessed by light microscopy and stereology. The portal triad area of the Dox and Dox + Asa groups was increased significantly compared to controls at 6 h, whereas in the Asa group, the means were similar to controls. Assessment of histopathology indicated an increased time-dependent degeneration and necrosis of liver tissues in mice in the Dox and Dox + Asa groups. The protective effects of Asa were not evident in Dox + Asa group. When Dox and Asa were administered together, degenerative changes were greater than for in the group that was given Dox alone. We found that Asa and Dox combined therapy increased tissue damage.Öğe Dose-dependent effects of prenatal exposure of pioglitazone, the PPARγ agonist, on the hippocampus development and learning and memory performance of rat offspring(Academic Press Inc Elsevier Science, 2021) Sagir, DilekIt is known that pioglitazone, defined as a PPAR gamma agonist, has neuron-protective properties in nervous system disorders. The aim of this study is to investigate the effects of pioglitazone administration at different doses during prenatal period on the neurons, glial cells and learning-memory levels in the hippocampus of rat offspring. Pregnant rats were divided into three groups; Low-Dose Pioglitazone (LDP), High-Dose Pioglitazone (HDP) and control (C) (n = 3). Pregnant rats in the HDP and LDP groups were given pioglitazone at 30 mg/kg and 5 mg/ kg doses, respectively, by gavage once a day during their pregnancy. No procedure was applied to the rats in the control group. Morris water tank test was applied to offspring obtained from postnatal 24th to 28th day. The offspring were sacrificed on the 29th postal day and their brain tissues removed. Stereological, histopathological and immunohistochemical techniques were used to analyze brain tissues. As a result of the analysis, it was observed that there were delays in learning and memory, the number of pyramidal neurons decreased, and the density of cells stained with glial fibrillar acidic protein (GFAP) positive increased in the HDP group compared to the other groups (p < 0.05). No significant difference was found between the LDP and control groups in terms of these parameters (p > 0.05). Our results showed that pioglitazone administered in the prenatal period had an effect on the hippocampus development and learning and memory performance of rats, depending on the dose.Öğe Effect of high sound wave on ovarian tissue: an experimental study(Taylor & Francis Ltd, 2021) Kanbur, Savas; Sagir, DilekAfter air pollution, the most important environmental factor threatening human health is noise. Physiologic damage or psychological damage can occur because of noise. Increased oxidative stress, vascular changes and mechanical trauma may be responsible for the physiologic damage mechanism of noise. This study aimed to reveal the effect of noise on follicles in ovaries. In the study, a total of 30 female Wistar albino rats (12 weeks old) were randomly divided into three groups (n = 10): the control group, no treatment; the sham group, exposed to stress conditions (but not to any high waves) in a special room at the same time as the high sound wave group; and the high sound wave (HSW) group, exposed to HSW in a special room for 28 days. At the end of the 28th day, the rats were sacrificed and ovarian tissues were harvested. Stereologic and biochemical analyses were performed. All stereologic volumetric parameters and Gonadal Somatic Index (GSI) values, lipid peroxidation (LPO) and glutathione (GSH) levels in all groups were evaluated statistically, and significant differences were found between the control and HSW, sham and HSW groups, respectively. However, no statistical difference was found between the control and sham groups. A decrease in catalase (CAT) and superoxide dismutase (SOD) activities were found in the HSW group compared with the control and sham groups, suggesting that noise can cause oxidative stress and damage to the ovaries.Öğe Effects of cellular phone electromagnetic field exposure on the hippocampi of rats in childhood and adolescence(Wolters Kluwer Medknow Publications, 2021) Okur, Zeynep Hatice; Sagir, DilekObjective: The effects of the electromagnetic fields (EMFs) emitted from cell phones on living organisms and human health have become one of the most important topics for research because cell phones are widely used, even at early ages, all over the world. In this study, it was aimed to reveal the effects of exposure to EMFs emitted from cell phones on the hippocampus region of the brain during childhood and adolescence. Materials and Methods: In the study, newborn rats were divided into six groups as control 1-21, EMF 1-21, control 21-60, EMF 21-60, control 1-60, and EMF 1-60. The rats in the EMF groups were exposed to an EMF emitted from cell phones placed in cages every day. No procedure was performed in the control (C) groups. Sections taken from the brain tissues were evaluated using histopathologic, stereologic, and immunohistochemical methods. Results: According to the stereologic analysis results we obtained from the study, there was a significant decrease in the number of pyramidal cells and hippocampus volume in the EMF 1-60 group (P < 0.05). In the histopathologic examinations of the brain sections, it was observed that there were many damaged neurons with darkly stained cytoplasms among normal pyramidal cells in all age groups exposed to EMF. In addition, caspase 3 immunoreactivity was found to be statistically significantly increased in the EMF 1-60 group compared with all other groups (P < 0.05). Conclusion: Chronic cell phone exposure from birth to the end of adolescence causes neuronal damage and volume reduction in the developing hippocampus.Öğe Effects of supplementing the rainbow trout (Oncorhynchus mykiss) diet with Spirulina and Chlorella on the tissue's cadmium detoxification capacity, growth performance, fatty acid composition, antioxidant defense system and liver histology(Elsevier, 2025) Harmantepe, Fatma Burcu; Gundogdu, Ayse; Karsli, Zafer; Sagir, DilekThis study aimed to determine the effects of the addition of Spirulina and Chlorella of the diets of rainbow trout (Oncorhynchus mykiss) on their growth, nutrient composition, the parameters of their antioxidant defense systems, liver histology, and the cadmium removal process of their tissues. Fish with an average weight of 84.25 +/- 3.55 g containing Cd in their tissues were distributed in 15 tanks with 18 fish per tank. The fish were fed diets consisting of 0% (Control-1), 0% (Control-2), 4% Chlorella, 4% Spirulina and Chlorella +2% Spirulina twice a day until they were satiated for a period of 80 days. At the conclusion of the experiment, it was determined that diets containing microalgae demonstrated increased growth rates, and that the growth values obtained from the 4% Spirulina and the Control-1 were similar (p > 0.05). Regarding the fatty acid content, with the addition of microalgae to the diet, a significant (p < 0.05) decrease in SFA values and a significant (p < 0.05) increase in PUFA values were observed compared to the groups Control-1 and Control-2. On days 40 and 80, Cd levels in the muscle and liver tissue of the fish were found to be significantly (p < 0.05) lower in the groups that were fed diets containing microalgae in comparison with the Control-2 group. On days 40 and 80, the SOD, CAT, GSH, GST, and GPx values of liver tissues were higher (p < 0.05) than those of the Control-2 group. As a result of the semiquantitative histopathological evaluation of the liver tissues, improvements were observed in all groups containing microalgae; however, the most remarkable improvement was achieved in the Spirulina group. The results obtained in the study revealed that the addition of microalgae to rainbow trout feed removed Cd from liver and muscle tissues, reinforced the antioxidant defense system parameters, and increased growth. However, when the groups containing microalgae were compared among themselves, the diets containing 4 % Spirulina and 2 % Chlorella +2 % Spirulina were found to be more effective on these parameters.Öğe Efficacy of Extracorporeal Shockwaves Therapy on Peripheral Nerve Regeneration(Lippincott Williams & Wilkins, 2019) Sagir, Dilek; Bereket, Cihan; Onger, Mehmet Emin; Bakhit, Nagi; Keskin, Metehan; Ozkan, EnesPurpose: This study was conducted to determine the effects of different doses and methods of extracorporeal shock wave treatment (ESWT) on the sciatic nerve regeneration of rat model using unbiased quantitative stereological techniques and to know which method and dose were effective. Methods: Twenty-five Wistar albino rats were used in the experiment. All animals were randomly divided into 5 groups. To the first group (control, n = 5) ESWT and surgery were not applied. To 2nd group (E300*2, n = 5), twice doses of 300 impulses uESWs (unfocused) were applied. To 3rd group (E500*2, n = 5), twice doses of 500 impulses uESWs (unfocused) were applied. To 4th group (E300*2, n = 5), twice doses of 300 impulses of fESWs (focused) were applied. To 5th group (E500*2, n = 5), twice doses of 500 impulses of fESWs (focused) were applied. Rats were sacrificed and nerve samples analyzed on the 22nd day following the operation. Results: There is a variable increase in the axon numbers among the shockwave treated groups in compare to the control group. The focused groups showed better improvement and the 300-focused group has shown the highest regeneration rate. Conclusion: The authors found that ESWT promotes nerve regeneration, increases the thickness of the myelin sheath and that the most effective result is in the 300 shock wave.Öğe Hepatoprotective Effects of Curcumin on Liver Injury in Streptozocin-induced Diabetic Rats(Wolters Kluwer Medknow Publications, 2024) Ozkaptan, Bilge Bal; Sagir, Dilek; Aksoy, FatmaIntroduction: Type 2 diabetes mellitus is characterized by chronically elevated blood sugar levels associated with disruption of the inflammatory and oxidative state and dyslipidemia. Curcumin is a highly pleiotropic molecule with hypoglycemic, hypolipidemic, anti-inflammatory, and antioxidant properties. The aim of this study was to evaluate the effects of curcumin on the liver of streptozotocin-induced diabetic rats. Materials and Methods: Thirty-two adult male rats were used in the study. The rats were divided into four groups: Control (C), Diabetes (D), Curcumin (CUR), and Diabetes + Curcumin (D + CUR) (n = 8). The groups given curcumin were given 60 mg/kg curcumin by gavage once a day during the 14-day study period. At the end of the experiment, biochemical, stereological, histological, and immunohistochemical analyses were performed on blood and liver samples taken from rats sacrificed. Results: After curcumin treatment in diabetic rats, there was a significant decrease in blood glucose levels, hepatic markers, and levels of thiobarbituric acid reactive substances (P < 0.01). Furthermore, a significant increase in enzymatic antioxidants such as superoxide dismutase, catalase, and glutathione peroxidase was observed after treatment (P < 0.01). It was determined that curcumin decreased the apoptotic index and the number of dual-nucleated hepatocytes in the liver, and provided support for liver regeneration (P < 0.01). Discussion and Conclusion: Based on the findings of this study, it can be concluded that curcumin has the potential to protect against hyperglycemia-induced oxidative stress and apoptosis in liver cells, and also induces regeneration in damaged liver.Öğe Histological Evaluation of the Protective Role of ß-glucan Against Cisplatin-Induced Hepatotoxicity(Karamanoglu Mehmetbey Üniversitesi, 2024) Yilmaz, Burcu Demirel; Eren, Banu; Sagir, Dilek; Basardi, Ayse; Mercan, SevcanCisplatin is a commonly used chemotherapeutic agent in the treatment of many cancers. The most important dose-limiting side effect is hepatotoxicity. Some studies have shown that antioxidant treatment with cisplatin reduces the toxic effect. In the present study, we were aimed to investigate the protective effects of antioxidant ß-glucan on histological injury caused by cisplatin treatment in the liver. Wistar rats were randomly divided into three groups according to time of sacrifice, 7th day and 14th day (n=20 rats each). Both groups were then divided into four sub-groups Control, Cisplatin (10 mg/kg bw), ß-glucan (100 mg/kg bw) and cisplatin+ß-glucan (n=5 in each group). The rats were sacrificed at the 7th day and 14th day after the last injection. The liver sections were evaluated under a light microscope after the histological procedure. Histological injury caused by cisplatin in different days were evaluated as as sinusoidal congestion, hydropic degeneration, disorganization of hepatic cords, and mononuclear cellular infiltration in liver. When ß-glucan was administered with cisplatin, it was determined that cellular damage caused by cisplatin decreased considerably in the liver in the different days groups. The light microscopic examination showed that the antioxidant beta-glucan protects against hepatotoxicity caused by cisplatin with its free radical scavenging effect. In conclusion, ß-glucan may improve patients' quality of life by reducing cisplatin's toxicity on the liver.Öğe Inhibition of acrolein-induced apoptosis by the antioxidant selenium(Sage Publications Inc, 2020) Gokce, Ayse Basardi; Eren, Banu; Sagir, Dilek; Yilmaz, Burcu DemirelIn this study, the effects of a potent antioxidant, selenium, on apoptosis induced by acrolein, a cytotoxic and genotoxic environmental pollutant, were investigated by immunohistochemical and electron microscopic methods. One hundred adult male Wistar albino rats were used in the study. The rats were divided into four main groups: control, acrolein, selenium, and acrolein + selenium. The animals in the experimental groups were given 1 mg/kg/day selenium and 4 mg/kg/day acrolein daily for 7 days by gavage. After drug administration, each group was divided into subgroups according to the time they were to be euthanized: 12th hour, 1st, 2nd, 3rd, and 5th day. The rats in each group at the determined time were euthanized and their livers were removed. Routine histological procedures were performed for light and electron microscopy examinations. After applying the Terminal Deoxynucleotidyl Transferase dUTP nick end labeling assay on the liver sections, apoptotic index values were calculated. Comparing the liver sections of the rats in the acrolein group and the control group, acrolein was found to cause a significant increase in the apoptotic index. The apoptotic index values of the acrolein + selenium group decreased compared to the acrolein group. In the electron microscopic examinations, apoptotic findings were observed in the liver tissues of the rats given acrolein, such as chromatin condensation in the nucleus of hepatocytes, dilatations in the perinuclear space, and cytoplasmic vacuolization. These apoptotic findings were not observed in the acrolein + selenium group after the 12th hour. These findings show that selenium may potentially be useful as a protective agent for people exposed to acrolein.Öğe Protective effects of curcumin and Ganoderma lucidum on hippocampal damage caused by the organophosphate insecticide chlorpyrifos in the developing rat brain: Stereological, histopathological and immunohistochemical study(Elsevier Gmbh, 2020) Eronat, Kubra; Sagir, DilekThe aim of this study is to draw attention to the possible effects of chlorpyrifos exposure on the developing rat hippocampus in the prenatal period and to determine whether these effects can be reduced with various antioxidant substances. Pregnant rats were divided into 7 groups.; Chlorpyrifos (CPF), Curcumin (CUR), Ganoderma lucidum (GNL), Chlorpyrifos + Curcumin (CPF + CUR), Chlorpyrifos + Ganoderma lucidum, (CPF + GNU SHAM and Control (C). After the experiments, brain tissues were evaluated by stereological and immunohistochemical methods. As a result of the stereological analyzes, it was determined that the number of pyramidal neurons in the hippocampus of the CPF group decreased significantly from all other groups. In contrast, the number of neurons in the CPF + CUR and CPF + GNL groups was significantly higher than the CPF group. In addition, immunohistochemical analyzes showed that the density of cells stained with glial fibrillar acidic protein (GFAP) positive in all areas in the hippocampus of the rats in the CPF group was significantly higher compared to the control group, whereas in the CPF + CUR and CPF + GNL groups were less than the CPF group. As a result, the exposure of CPF in the prenatal period caused neurotoxicity in the brain hippocampus, whereas CUR and GNL reduced this toxicity caused by CPF.Öğe Stereological examination of curcumin's effects on hippocampal damage caused by the anti-epileptic drugs phenobarbital and valproic acid in the developing rat brain(Elsevier Gmbh, 2019) Yilmaz, Burcu Demirel; Eren, Banu; Sagir, Dilek; Eren, Zafer; Gokce, Ayse BasardiThe anti-epileptic drugs phenobarbital and valproic acid have an extremely strong negative effect on cognitive processes such as learning and memory in the developing brain. We examined whether or not curcumin has protective effects on neuronal injury caused by these drugs in the developing rat brain. Young male Wistar rats were studied in two groups, a 7 days old and a 14 days old group (35 rats in each). Both groups were then divided into 7 sub-groups as the control, curcumin, dimethylsulfoxide, phenobarbital, valproic acid, phenobarbital + curcumin, and valproic acid + curcumin groups (n = 5 in each group). At 24 h after the intraperitoneal injection of the compounds, the rats were sacrificed, and the hippocampal tissue was subjected to stereological analysis with the optical fractionation method. Total numbers of neurons in the hippocampus of the 7 days old and 14 days old rats were calculated. It was found that treatment with phenobarbital resulted in a loss of 43% of the neurons, and valproic acid induced a loss of 57% of the neurons in the 7 days old rats. Curcumin prevented this loss significantly with only 19% in the phenobarbital group and 41% in the valproic acid group. In the 14 days old rat groups, phenobarbital was found to reduce the number of neurons by 30%, and valproic acid reduced it by 38%. Curcumin treatment limited neuronal loss to 3% in the phenobarbital + curcumin group and 10% in the valproic acid + curcumin group. These data strongly indicate that curcumin is a protective agent and prevents hippocampal neuronal damage induced by phenobarbital and valproic acid treatment.Öğe THE COMPARATIVE HISTOLOGY OF THE DIGESTIVE TRACT OF ACRIDA ANATOLICA AND PARAPHOLIDOPTERA SPINULOSA (ORTHOPTERA)(Mümin POLAT, 2019) Eren, Banu; Basar, Fatih; Sagir, Dilek; Yilmaz, Burcu Demirel; Mercan, Sevcan; Eren, ZaferAcrida anatolica and Parapholidopteraspinulosa are two different species of migratory caterpiller in the samefamily and both are threats to agriculture. They areharmful, they migrate andspread wide areas. Herbivorous Acridaanatolicahas strong chewy mouth part, mandibula is considered to be thebasic insect mouth type. Parapholidopteraspinulosa a carnivorous species, has a strong chewing gut. The purpose ofthis study is to compare the structures of the digestive tracts of these species.The digestive tract is divided into three parts, the foregut, midgut, and thehindgut. The prismatic epithelium, external circular and longitudinal muscles,connective tissue, granular structures and peritrophic membrane are the partsof the foregut. The caeceum is also found in this portion.The grasshoppers werecollected from the Ondokuz Mayis University Campus and kept in special containersand fed with wheat grass, fresh grass and with different insects. During thedissection process, the digestive tracts were removed and tissues were fixedwith 10% buffered neutral formalin solution for 24 hours. After routinehistological procedures, the sections were stained withhematoxylin-eosin (H-E).Foregut, midgut and hindgut were comparatively examined in terms of peritrophicmembrane, epithelial tissue, cell size, nucleus size, circular and longitudinalmuscles, connective tissue, regenerative cells and cellular diversity. The knowledge of grasshopper histology and embryologywill contribute to the development of more efficient fighting with grasshoppersand the development of agricultural plant protection products.
