Fakülteler / Faculties
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Item Effect of Acrylamide Treatment on Arginase Activities and Nitric Oxide Levels in Rat Liver and Kidney(2014) Ozturan-Ozer, Eda; Ucar, Gulberk; Helvacioglu, Fatma; Akaydin-Aldemir, Derya; Turkoglu, Suna; https://orcid.org/0000-0001-6543-4043; https://orcid.org/0000-0002-6026-0045; https://orcid.org/0000-0003-4805-1918; AAK-3000-2021; AAH-8887-2021; AAJ-2243-2021Aim: To evaluate the effects of acrylamide treatment on the activities of rat liver, kidney arginase activities and nitric oxide levels considering the possible induction of oxidative stress. Materials and methods: Serum aminotransferase activities, blood-urea nitrogen (BUN) and creatinine concentrations and tissue malondialdehyde (MDA), reduced glutathione (GSH), total nitrite concentrations and arginase activities were evaluated in groups. Histopathological analysis was performed. Results: Acrylamide treatment did not modulate liver and kidney serum markers. Hepatic MDA, GSH concentrations did not change whereas they were elevated in kidney tissues of high dose treated group (p<0.05). Arginase activity in grain liver tissue decreased (p<0.0001), but specific activity did not alter. Total nitrite concentrations increased in high dose treated group (p<0.05). In kidney, high dose of acrylamide treatment elevated activity and specific activity of arginase (p<0.05). No alteration was detected in total nitrite levels. Ultrastructural alterations were detected in epithelial cells of proximal tubules in kidney sections of the rats treated with high dose of aculamide. Conclusion: Liver seems to protect itself against acrylamide toxicity whereas, kidney can be considered as a probable target tissue for acrylamide-induced oxidative stress.Item Diffusion-Weighted MRI and Optimal b-value For Characterization of Liver Lesions(2014) Kaya, Bilal; Koc, Zafer; https://orcid.org/0000-0002-8917-3375; https://orcid.org/0000-0003-0987-1980; 23982322; AAK-9366-2020; S-8384-2016Background: Diffusion-weighted imaging (DWI) is commonly used to distinguish between benign and malignant liver lesions. However, different b-values are recommended. Purpose: To determine the most suitable b-value in DWI for differentiation of benign and malignant liver lesions. Material and Methods: A total of 124 lesions in 89 consecutive patients (43 men, 46 women; age, mean +/- standard deviation, 58 +/- 14 years) with a pathological or radiological diagnosis of malignant or benign focal liver lesions after magnetic resonance imaging (MRI) were included in this study. Routine abdominal MRI and DWI were performed using seven b-values (0, 50, 200, 400, 600, 800, 1000 s/mm(2)). Lesions were analyzed for benignity/malignity using apparent diffusion coefficient (ADC) values with 10 b-value combinations and by measuring the lesion/normal parenchyma ADC ratio. Results: Mean ADC values were significantly different between malignant and benign lesions for all b-value combinations (P = 0.000). The best b-value combination was 0 and 800 (Az = 0.935). Using lower b-values such as 0 and 50 together with higher b-values >= 600 s/mm(2) was beneficial (Az = 0.928 and 0.927). Mean ADC values were approximately 13% (1-15%) higher in total when b = 0 and b = 50 s/mm(2) were included in multiple b-value combinations. Conclusion: In DWI, we recommend the use of b-values of 0 and 800 s/mm(2) as two b-values, or b = 0, 50, 600, 800, and 1000 s/mm(2) as multiple b-values for distinguishing between benign and malignant liver lesions. Mean ADC value is 13% higher in total by additional use of b = 0 and b = 50 s/mm(2) in multiple b-value combinations.Item Optimal b Value in Diffusion-Weighted Imaging for Differentiation of Abdominal Lesions(2014) Koc, Zafer; Erbay, Gurcan; https://orcid.org/0000-0003-0987-1980; https://orcid.org/0000-0002-1706-8680; 24115207; S-8384-2016; AAK-5370-2021Purpose: To explore the optimal b value in diffusion-weighted imaging (DWI) for differentiation of benign and malignant abdominal lesions. Materials and Methods: A total of 108 consecutive patients (age 60 +/- 12.5 years) with 127 pathologically confirmed diagnoses of abdominal lesions were included. Single-shot echoplanar imaging (SH-EPI) DWI (1.5T) with seven b values and eight apparent diffusion coefficient (ADC) maps were obtained. The lesions were analyzed visually on DWI and ADC maps for benignity/malignity using a 5-point scale and by measuring the ADC values and ADC lesion/normal parenchyma ADC ratio. ROC analysis was used to evaluate the diagnostic accuracy of ADC for differentiating between benign and malignant lesions. Pathology results were the reference standard. Results: Differentiation between malignant and benign lesions using visual scoring was successful at b values of 600 or higher (sensitivities, specificities, and accuracies were 100/93.8/92.5, 84.7/82.6/80.4, and 94.4/89.7/88.1, respectively, for b600, 800, and 1000). The mean ADC values of malignant lesions were significantly lower than those of benign lesions for all b-value combinations except b0 and 50 s/mm(2) (P = 0.032 for b0 and 50 s/mm(2), P = 0.000 for other b values). The best b-value combination was 0 and 600 s/mm(2) and multiple b2. The lesion/normal parenchymal ADC ratio for b600, b1000, and multiple b2 better distinguished between benign and malignant lesions. Conclusion: In DWI, the optimal b value is 600 s/mm(2); multiple b values of 600 s/mm(2) and higher are recommended to differentiate between benign and malignant abdominal lesions. The lesion ADC/normal parenchyma ADC ratio is more accurate than using lesion ADC only.Item Experimental Study on The Effects of Massive Bowel Resection on Liver Function and Hepatocyte Apoptosis(2014) Bostanoglu, Akin; Orug, Taner; Yildiz, Baris Dogu; Isik, Sevil; Zengin, Neslihan Inci; Evren, Ebru; Saydam, Gul Sevim; 25599780Background/Aims: The effects of short-bowel syndrome on liver function and liver morphology independent of parenteral nutrition have not been thoroughly investigated. Our aim was to investigate the effects of massive bowel resection on hepatocyte apoptosis and liver function in rats. Materials and Methods: A total of 37 female Sprague-Dawley rats were randomly assigned to five groups: Control (no procedure); Sham 1 [laparotomy (LT)/enterotomy (ET); evaluated on postoperative day (POD) 1]; Sham 2 (LT/ET; evaluated on POD7; Group 1 (80% bowel resection after LT/ET; POD1); and Group 2 (80% bowel resection; POD7). Blood samples were obtained for measuring aspartate aminotransferase, alanine aminotransferase, and lactate dehydrogenase levels. For assessing hepatocyte apoptosis, liver tissue samples from the median lobe were obtained and used for a terminal deoxynucleotidyl transferase deoxyuridine triphosphate nick-end labeling assay. Results: Aspartate aminotransferase, alanine aminotransferase, and lactate dehydrogenase levels showed statistically significant differences among the five groups. Apoptotic hepatocyte counts there were statistically significant differences among groups for counts made in 20 consecutive high-power fields. However, liver sinusoidal cell apoptosis rates among groups showed statistically significant differences for counts made in 20 consecutive highpower fields, particularly on POD7 in rats undergoing massive bowel resection. Conclusion: Parenteral nutrition is not the only factor involved in liver dysfunction after massive bowel resection. Massive bowel resection alone can cause liver abnormalities. Rats undergoing massive small intestinal resection show significant temporal increases in liver sinusoidal cell apoptosis rates.Item Effects of Ciprofloxacin on Fetal Rat Liver During Pregnancy and Protective Effects of Quercetin(2017) Dogan, Z.; Elbe, H.; Taslidere, E.; Soysal, H.; Cetin, A.; Demirtas, S.; 0000-0001-7131-2317; 0000-0003-1723-2556; 28836867; V-5131-2018; ABI-8046-2020; AAL-4660-2020Urinary tract infections are common in pregnant women and ciprofloxacin frequently is used as a broad spectrum antibiotic. It has been suggested that ciprofloxacin causes liver damage in fetuses. Quercetin is a flavonoid with antioxidant properties. We investigated the efficacy of quercetin treatment for preventing fetal liver damage caused by ciprofloxacin. Pregnant rats were divided into four groups: untreated control group (C), 20 mg/kg quercetin for 21 days group (Q), 20 mg/kg twice/day ciprofloxacin for 10 days group (CP), and 20 mg/kg, ciprofloxacin + quercetin for 21 days group (CP + Q). Fetal livers were removed on day 21 of gestation to measure antioxidants and for histological observation. Malondialdehyde (MDA) and glutathione (GSH) levels, and superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GSH-Px) activities were measured in tissue samples. GSH-Px, SOD and CAT activities were significantly lower in the CP group compared to group C. A significant increase in MDA was observed in the CP group compared to group C. There was no significant difference in GSH levels in any group. MDA levels were lower and CAT, SOD and GSH-Px enzyme activities were higher in the CP + Q group compared to group CP. Liver samples of the CP group exhibited central vein dilation, portal vein congestion, pyknotic nuclei and cytoplasmic vacuolization in some hepatocytes. Histological changes were less prominent in the rats treated with quercetin. Use of ciprofloxacin during pregnancy caused oxidative damage in fetal liver tissue. Oxidative stress was ameliorated by quercetin. Quercetin supports the antioxidant defense mechanism and it is beneficial for treating fetal liver damage caused by ciprofloxacin.Item Subcapsular Hydatid Cyst of the Liver(2017) Kus, Murat; Arer, Ilker Murat; Akkapulu, Nezih; Yabanoglu, Hakan; 0000-0001-6529-7579; 0000-0001-7392-961X; 0000-0002-1161-3369; AAJ-7870-2021; AAM-8548-2021; AAJ-7865-2021Hydatid cyst disease is an important health problem in Turkey. The disease localized in liver in most of the cases, but also be exits everywhere in the body. One of the rare complications of liver's hydatid cyst is subcapsular perforation. We present a 53 year male patient with subcapsular perforation of liver hydatid cystItem Solid Liver Lesions in an Infant With Neonatal Cholestasis: Is it Always Malignant?(2017) Baris, Zeren; Borcek, Pelin; Haberal, Kemal Murat; Ozcay, Figen; 0000-0002-8211-4065; 0000-0002-5214-516X; 28816798; AAB-4153-2020; R-9398-2019; ABG-5684-2020In this report we describe a patient with neonatal cholestasis who was found to have a liver lesion with suspicious imaging features, although ultimately it was histologically proved to be a pseudotumor. We discuss the characteristic features and imaging findings of macroregenerative nodules of the liver.Item How safe is pregnancy after liver transplantation? A large case series study at tertiary referral center in Turkey(2020) Gulumser, Cagri; Kinap, Mahir; Yanik, Filiz Bilgin; Uysal, Nihal Sahin; Moray, Gokhan; Haberal, Mehmet; 0000-0002-3462-7632; 0000-0003-2498-7287; 0000-0001-5385-5502; 0000-0002-4066-9038; 30227751; AAJ-8097-2021; AAE-1041-2021; AAA-9475-2020; C-6543-2018Objective: To investigate pregnancy outcomes and to define preventative measures against to risk factors and complications in pregnancy after liver transplantation. Secondary aim is to report postpartum allograft functions in these patients. Method: This is a case series study. All pregnant women with liver transplantations performed in our hospital were enrolled. Patients' hospital medical records, electronic records Neonatal Intensive Care Unit (NICU) records were used to collect data. Obstetric characteristics and antenatal complications, risk factors, pregnancy and neonatal outcomes, all aspects of liver transplant variables and allograft functions after pregnancy were studied. Results: A total of 11 patients were included in the study. All of them were singleton. Mean maternal age was 29.3 +/- 3.9 years. And mean gestational week of delivery was 37.2 +/- 2.2. 78% of the women were delivered at term (>37 weeks) only two babies were preterm and discharged from NICU without any complications. Birth weight (gr median +/- SD) was 2575 +/- 345. Five (45%) patients were nulliparous, majority of the cases (8/11, 72%) were conceived of pregnant with natural way. Live birth rate was 81% (9/11). Only one patient for each has suffered from fetal growth restriction, maternal anemia, maternal hyperthyroidism, and ulcerative colitis. Vaginal bleeding was seen in five women during the pregnancy. There was no maternal death, stillbirth or neonatal death. The mode of delivery for all live birth pregnancies was C-section. And none of them was emergency C-section. No complication of allograft function was seen after pregnancy. Conclusion: Pregnancy in women with liver transplantation is not associated with poor pregnancy outcomes and complications for both the mother and the neonates when these patients followed up at tertiary referral center with multidisciplinary approaches.Item The curative treatment of familial hypercholesterolemia: Liver transplantation(2019) Kirnap, Nazli Gulsoy; Kirnap, Mahir; Tutuncu, Neslihan Bascil; Moray, Gokhan; Haberal, Mehmet; 31626710; AAH-9198-2019Background Familial hypercholesterolemia (FH) is an autosomal dominant genetic disorder characterized by premature mortal cardiovascular complications. Liver transplantation (LT) is the only curative treatment option. In this study, the long-term clinical follow-up data of 8 patients who underwent LT with a diagnosis of FH in our center are presented. Materials and Methods A total of 638 LT were performed between December 1985 and June 2019 at Baskent University, of which 8 patients underwent LT with a diagnosis of FH and were evaluated retrospectively. Results Of the 8 patients, 4 underwent deceased donor and 4 living donor transplantation. Five patients had preoperative cardiovascular disease and consequent interventional operations. There was significant reduction in postoperative LDL-C and TC levels starting from the first week, and stabilizing at the first month and first year. The median survival time of patients was 5 years (2-12 years). All patients are still alive. None of the complications of patients with preoperative cardiovascular complications had progressed. Conclusion Liver transplantation is the preferred curative treatment for the pathophysiology of FH. In our study, LDL-C levels were brought under control with LT performed on patients with FH. Median 5-year follow-up of patients showed that the progression of cardiac complications was abated.