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Öğe Acrylamide reduces plasma antioxidant vitamin levels in rats due to increased oxidative damage(Pontificia Universidade Catolica Campinas, 2020) Yener, Yesim; Yerlikaya, Fatma HumeyraObjective Acrylamide is a potentially neurotoxic and carcinogenic chemical and naturally creates during the heating process of carbohydrate-rich foods, such as potato chips and breakfast cereals. Acrylamide might be ingested by people via consuming food that contains it. Therefore, we investigated the effect of acrylamide given orally to male and female rats on plasma retinoic acid and alpha-tocopherol and serum sialic acid and malondialdehyde levels. Method A total of 50 Wistar rats were used (25 female and 25 male, three-four weeks old). The rats of each sex were given 2 and 5mg/kg/day acrylamide via drinking water for 90 days. At the end of the treatment, the animals were euthanized by cervical dislocation. Blood specimens were collected through cardiac puncture, and serum and plasma samples were analysed using the high-performance liquid chromatography technique with a Ultraviolet detector. Results The analysis of the plasma and serum samples revealed that serum sialic acid and malondialdehyde levels in both sexes given 5mg/kg/day acrylamide were significantly increased, and the serum sialic acid levels were higher in female rats given 2mg/kg/day acrylamide. The plasma retinoic acid and alpha-tocopherol levels significantly decreased in both sexes given only the highest dose. Conclusion The results show that acrylamide causes an increase in oxidative stress and leads to a decrease in the levels of retinoic acid and alpha-tocopherol which play a role in the defense mechanism against this stress.Öğe Acrylamide reduces plasma antioxidant vitamin levels in rats due to increased oxidative damage(Pontificia Universidade Catolica Campinas, 2020) Yener, Yesim; Yerlikaya, Fatma HumeyraObjective Acrylamide is a potentially neurotoxic and carcinogenic chemical and naturally creates during the heating process of carbohydrate-rich foods, such as potato chips and breakfast cereals. Acrylamide might be ingested by people via consuming food that contains it. Therefore, we investigated the effect of acrylamide given orally to male and female rats on plasma retinoic acid and alpha-tocopherol and serum sialic acid and malondialdehyde levels. Method A total of 50 Wistar rats were used (25 female and 25 male, three-four weeks old). The rats of each sex were given 2 and 5mg/kg/day acrylamide via drinking water for 90 days. At the end of the treatment, the animals were euthanized by cervical dislocation. Blood specimens were collected through cardiac puncture, and serum and plasma samples were analysed using the high-performance liquid chromatography technique with a Ultraviolet detector. Results The analysis of the plasma and serum samples revealed that serum sialic acid and malondialdehyde levels in both sexes given 5mg/kg/day acrylamide were significantly increased, and the serum sialic acid levels were higher in female rats given 2mg/kg/day acrylamide. The plasma retinoic acid and alpha-tocopherol levels significantly decreased in both sexes given only the highest dose. Conclusion The results show that acrylamide causes an increase in oxidative stress and leads to a decrease in the levels of retinoic acid and alpha-tocopherol which play a role in the defense mechanism against this stress.Öğe Arterial Stiffness, Carotid Intima-Media Thickness, Endocan, and A Disintegrin and Metalloproteinase With Thrombospondin Type I Motif 9 Levels and Their Relationship With Disease Activity in Patients With Acromegaly With and Without Cardiovascular Risk Factors(Elsevier Inc, 2022) Can, Mustafa; Kocabas, Muhammet; Karakose, Melia; Yerlikaya, Fatma Humeyra; Alsancak, Yakup; Turkmen, Kultigin; Kulaksizoglu, MustafaObjective: Cardiovascular complications such as cardiomyopathy and endothelial dysfunction, which are frequently seen in patients with acromegaly, are among the most important causes of morbidity and mortality. In this study, we aimed to investigate arterial stiffness, carotid intima-media thickness, endocan level, and A disintegrin and metalloproteinase with thrombospondin type I motif 9 level and their relationship with disease activity in patients with acromegaly with and without cardiovascular risk factors. Methods: A total of 60 patients with acromegaly-25 with active disease, 26 with well-controlled disease, and 9 with newly diagnosed disease-and 60 age-, sex-, and body mass index (BMI)-matched healthy control subjects were enrolled in this study. All the subjects' height, weight, BMI, systolic blood pressure (SBP), diastolic blood pressure (DBP), fasting plasma glucose (FPG) level, insulin, hemoglobin A1C (HbA1C), C-reactive protein, lipid, endocan, A disintegrin and metalloproteinase with thrombospondin type I motif 9 levels, pulse wave velocity (PWV), and carotid intima-media thickness were measured. Results: The SBP, DBP, FPG level, HbA1C level, and PWV of the acromegaly group were higher than those of the control group. In patients with acromegaly with cardiovascular disease (CVD) risk factors, the PWV was higher than that in the control group, and in patients with acromegaly without CVD risk factors, the PWV was similar to that in the control group. In a correlation analysis, a positive correlation was found between PWV and age, BMI, SBP, DBP, FPG level, and HbA1C level in the acromegaly group. Conclusion: In our study, we found that arterial stiffness increased in patients with acromegaly with CVD risk factors and that increased arterial stiffness was associated with hemodynamic (SBP and DBP) and metabolic (BMI, FPG level, and HbA1C level) parameters. (c) 2021 AACE. Published by Elsevier Inc. All rights reserved.Öğe Assesment of oxidative status and its association with thyroid autoantibodies in patients with euthyroid autoimmune thyroiditis(Springer, 2015) Baser, Husniye; Can, Ummugulsum; Baser, Salih; Yerlikaya, Fatma Humeyra; Aslan, Uysaler; Hidayetoglu, Bahauddin TahaOxidative stress results from either overproduction of free radicals or insufficiency of several antioxidant defense systems. It leads to oxidation of main cellular macromolecules and a resultant molecular dysfunction. Thyroid hormones regulate oxidative metabolism and, thus, play a role in free radical production. Studies evaluating oxidative stress in patients with hypothyroidism and hyperthyroidism have been encountered in recent years; however, oxidative status in patients with euthyroid autoimmune thyroiditis (AIT) was not investigated previously. Thirty-five subjects with euthyroid AIT and 35 healthy controls were enrolled in the study. Serum oxidative status was determined by the measurement of total anti-oxidant status (TAS), total oxidant status (TOS), ischemia-modified albumin (IMA), and oxidized-low density lipoprotein (ox-LDL) levels. Serum TAS levels were significantly lower (p < 0.001), while serum TOS levels and IMA levels were significantly higher (p < 0.001 and p = 0.020, respectively) in patients compared to controls. In both groups, ox-LDL levels were similar (p = 0.608). Serum TAS levels were negatively correlated with antithyroid peroxidase and anti-thyroglobulin (anti-TG) levels (rho = -0.415, p = 0.001 and rho = -0.484, p < 0.001, respectively). Serum TOS was positively correlated with anti-TG levels (rho = 0.547, p < 0.001). Further, TAS was positively correlated with free T4 levels (r = 0.279, p = 0.043). No correlation was observed between thyrotropin, free T3 levels, and TOS and TAS levels. These results suggest that oxidants are increased, and anti-oxidants are decreased in patients with euthyroid AIT, and oxidative/anti-oxidative balance is shifted to the oxidative side. Increased oxidative stress might have a role in thyroid autoimmunity.Öğe Association between ischemia-modified albumin, homocysteine, vitamin B12 and folic acid in patients with severe sepsis(Walter De Gruyter Gmbh, 2012) Erdem, Said Sami; Yerlikaya, Fatma Humeyra; Cicekler, Humeyra; Gul, MehmetBackground: The aim of the present study was to investigate scrum ischemia-modified albumin (IMA), homocysteine, malondialdehyde (MDA), vitamin B-12 and folic acid levels in patients with severe sepsis, compared to healthy control subjects. Also, we examined associations of these parameters with high-sensitivity C-reactive protein (hsCRP) in patients with severe sepsis and healthy control subjects. Methods: This study was performed on 71 (40 male, 31 female) patients with severe sepsis aged 18-65 years and 70 (34 male, 36 female) healthy control subjects aged 18-65 years. Samples of patients were obtained at study entry within 24 h of onset of severe sepsis. Results: Serum IMA, homocysteine and MDA levels of the patients with severe sepsis were significantly higher than those of the healthy control subjects (p<0.0 I for IMA and homocysteine, and p<0.001 for MDA). There was no significant difference between serum vitamin B12 and folic acid levels of the groups. Serum hsCRP levels were positively correlated with IMA (p<0.01) and MDA (p<0.01) in the patients with severe sepsis. Conclusions: Our findings show that IMA may be useful as a prognostic biomarker because it can indicate the severity of illness in patients with sepsis.Öğe Association between ischemia-modified albumin, homocysteine, vitamin B12 and folic acid in patients with severe sepsis(Walter De Gruyter Gmbh, 2012) Erdem, Said Sami; Yerlikaya, Fatma Humeyra; Cicekler, Humeyra; Gul, MehmetBackground: The aim of the present study was to investigate scrum ischemia-modified albumin (IMA), homocysteine, malondialdehyde (MDA), vitamin B-12 and folic acid levels in patients with severe sepsis, compared to healthy control subjects. Also, we examined associations of these parameters with high-sensitivity C-reactive protein (hsCRP) in patients with severe sepsis and healthy control subjects. Methods: This study was performed on 71 (40 male, 31 female) patients with severe sepsis aged 18-65 years and 70 (34 male, 36 female) healthy control subjects aged 18-65 years. Samples of patients were obtained at study entry within 24 h of onset of severe sepsis. Results: Serum IMA, homocysteine and MDA levels of the patients with severe sepsis were significantly higher than those of the healthy control subjects (p<0.0 I for IMA and homocysteine, and p<0.001 for MDA). There was no significant difference between serum vitamin B12 and folic acid levels of the groups. Serum hsCRP levels were positively correlated with IMA (p<0.01) and MDA (p<0.01) in the patients with severe sepsis. Conclusions: Our findings show that IMA may be useful as a prognostic biomarker because it can indicate the severity of illness in patients with sepsis.Öğe Can altered colostrum miRNA expression profile after cesarean delivery be a risk factor for autoimmune diseases?(Wiley, 2021) Yerlikaya, Fatma Humeyra; Onmaz, Duygu Eryavuz; Altunhan, Huseyin; Ilhan, MerveProblem The cesarean section (CS) rate has increased significantly in North America, Western Europe, and Latin America. However, it has been reported that the incidence of inflammatory and autoimmune diseases such as asthma and type 1 diabetes increased in parallel with CS in these countries. Our aim was to investigate the expression level of miRNAs associated with inflammatory response and autoimmune diseases in colostrum samples and contribute to elucidating the role of CS in the pathogenesis of immune system-related diseases. Method of study Colostrum samples were taken from voluntary mothers who had 40 normal and 50 cesarean births. miRNAs were extracted from colostrums and detected to miRNA expression profiling (eighty-four miRNAs) by quantitative real-time PCR with the Fluidigm integrated microfluidic circuit technology. Results There was a statistically significant change in the expression levels of 17 miRNAs in the colostrums of mothers who had normal and cesarean delivery (p < .05), and all of miRNAs were upregulated in the colostrums of mothers who have had cesarean delivery. Conclusion Our best knowledge is that the study we conducted was the first to investigate the effect of delivery method (CS or normal) on the miRNA profile of colostrum. Cesarean delivery is a potential risk factor for inflammatory and immune system-related diseases in children due to dysregulation in miRNA expression.Öğe Development and validation of a sensitive, fast and simple LC-MS/MS method for the quantitation of favipiravir in human serum(Elsevier, 2021) Onmaz, Duygu Eryavuz; Abusoglu, Sedat; Onmaz, Mustafa; Yerlikaya, Fatma Humeyra; Unlu, AliFavipiravir is a broad-spectrum inhibitor of viral RNA polymerase. It is currently used as a possible treatment for coronavirus disease 2019 (COVID-19). Pre-clinical or clinical trials of favipiravir require robust, sensitive, and accurate bioanalytical methods for quantitation of favipiravir levels. Recently, several studies have been reported about developing a validated liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for measuring favipiravir levels. However, these methods were validated predominantly for plasma samples, electrospray ionization was operated only in negative or positive mode, and clinical application of these methods has not been applied for patients with COVID-19. This study aimed was to develop a validated LC-MS/MS method for the measurement of favipiravir levels in positive and negative electrospray ionization mode and to perform a pilot study in patients with COVID-19 receiving favipiravir to demonstrate the applicability of this method in biological samples. Simple protein precipitation was used for the extraction of favipiravir from the desired matrix. Favipiravir levels were quantitated using MS / MS with an electrospray ionization source in positive and negative multiple reaction monitoring (MRM) mode. The chromatographic detection was performed on a reverse-phase Phenomenex C18 column (50 mm x 4.6 mm, 5 mu m, 100 angstrom) with gradient elution using 0.1% formic acid in water and 0.1% formic acid in methanol as mobile phase. The method was linear over the concentration ranges of 0.048-50 mu g/mL (in negative ionization mode) and 0.062-50 mu g/mL (in positive ionization mode) with a correlation coefficient (r2) better than 0.998. The total run time was 3.5 min. The intra-assay and inter-assay % CV values were less than 7.2% and 8.0%, respectively. A simple, rapid and robust LC-MS / MS method was developed for the measurement of favipiravir and validation studies were performed. The validated method was successfully applied for drug level measurement in COVID-19 patients receiving favipiravir.Öğe The Dietary Acrylamide Intake Adversely Affects the Serum Trace Element Status(Humana Press Inc, 2013) Yerlikaya, Fatma Humeyra; Yener, YesimAcrylamide is an organic chemical which occurs in foods widespreadly consumed in diets worldwide. The purpose of this study was to evaluate the serum trace element levels (Fe, Cu, Zn, Mn, Cr, Se, Co, Ni, V, As, Mg, P, Li, K, Al) in Wistar rats exposed to acrylamide. Acrylamide was administered to the treatment groups at 2 and 5 mg/kg body weight (bw)/day via drinking water for 90 days. Inductively coupled plasma mass spectrometry was used for the determination of serum trace element concentrations. Serum Zn, Se, Co, V and Mg concentrations of 5 mg/kg bw/day acrylamide-treated male rats were lower, whereas serum As concentration was higher than the same parameters of the controls rats. Similarly, serum Zn, Se, Co, V and Mg concentrations were decreased in 5 mg/kg bw/day acrylamide-treated female rats compared with control rats. On the other hand, there were no significant differences between serum Fe, Cu, Mn, Cr, Ni, P, Li, K and Al concentrations of all groups. The results from this study provide evidence that dietary acrylamide intake adversely affects the serum trace elements status.Öğe THE EFFECT OF ENVIRONMENTAL ENRICHMENT AND WESTERN DIET ON THE TRACE ELEMENT STATUS AND OXIDATIVE STRESS IN RATS(Nobel Ilac, 2020) Can, Ummugulsum; Yerlikaya, Fatma Humeyra; Oz, Mehmet; Atalik, Kismet Esra Nurullahoglu; Gergerlioglu, Hasan SerdarObjective:The Western diet (WD), which is rich in highfat diet (HFD) and high-sucrose diet (HSD), is related to oxidative stress. Enriched environment (EE) with social interaction, physical exercise and continuous learning tasks has been shown to reduce oxidative stress, the inflammatory response, and increase the anti-oxidative defense. Therefore, the present study has aimed to clarify the effects of the EE and WD-fed rats on marker malondialdehyde (MDA) and trace element (TE) levels (iron [Fe], copper [Cu], zinc [Zn], chromium [Cr], selenium [Se], magnesium [Mg] and molybdenum [Mo]). Material and Method: Male Wistar albino rats were housed in either an enrichment (n=24) or standard environment (n=24) and fed with HFD (35% of energy as fat) (n=8), HSD (100% of carbohydrate as sucrose) (n=8), or standard rat chow(n=8), for 4 weeks. Inductively-coupled plasma mass spectrometry was used for determination of the serum TE levels. Results: The serum levels of MDA (p<0.05), Fe, Cu, Mo and Mg increased, while the serum levels of Cr and Se decreased, and additionally, the serum levels of Zn did not changed in the HFD and HSD groups. EE decreased partially the serum levels of MDA, Fe, Mo, and did not affect the serum levels of Cu, while it increased the serum levels of Mg, Cr, Se and Zn; however, there was no significant difference between all of the experimental groups (all; p>0.05). Conclusions: Our study demonstrated that HFD and HSD led to oxidative stress and adversely affected the serum level of TE in rats, and that the EE reversed partially this status.Öğe Effects of Cisplatin and Curcumin on the Hypothalamic-Pituitary-Adrenal Axis(Wiley-Blackwell, 2015) Oz, Mehmet; Demir, Enver Ahmet; Gergerlioglu, Hasan Serdar; Atalik, Kismet Esra Nurullahoglu; Yerlikaya, Fatma Humeyra[Abstract Not Availabe]Öğe Effects of hydroxychloroquine and its metabolites in patients with connective tissue diseases(Springer Basel Ag, 2021) Onmaz, Duygu Eryavuz; Tezcan, Dilek; Abusoglu, Sedat; Yilmaz, Sema; Yerlikaya, Fatma Humeyra; Onmaz, Mustafa; Abusoglu, GulsumHydroxychloroquine has attracted attention in the treatment of COVID-19. Many conflicting findings have been reported regarding the efficacy and safety of this drug, which has been used safely in the rheumatological diseases for years. However, these studies lacked measurement methods that allow accurate assessment of hydroxychloroquine and its metabolite levels. The aim of this study was to measure hydroxychloroquine and its metabolite levels in whole blood samples of patients with rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), Sjogren's syndrome (SS) and scleroderma (Scl) by a robust, simple and accurate validated tandem mass spectrometric method, and to investigate the relationship between these levels with drug-related adverse effects and disease activity scores. The validated LC-MS/MS method was applied to measure blood hydroxychloroquine and its metabolite levels of patients with RA, SLE, SS, Scl. Various haematological and biochemical parameters were measured with Beckman-Coulter AU 5800 and Beckman Coulter LH 780 analyzers, respectively. QTc intervals were calculated with Bazett's formula, and the patients were followed up by clinicians in terms of clinical findings and adverse effects. Hydroxychloroquine levels of patients were similar to previous studies. There was a negative correlation between disease activity scores and hydroxychloroquine levels, while the highest correlation was between QTc interval, creatinine and GFR levels with desethylchloroquine. Bidetylchloroquine had the highest correlation with RBC count and liver function tests. Our findings showed that hydroxychloroquine and its metabolite levels were associated with disease activity scores, renal, hepatic function, QTc prolongation, and hematological parameters.Öğe EFFECTS OF PHOTOTHERAPY ON SERUM PARAOXONASE ACTIVITY AND TOTAL ANTIOXIDANT CAPACITY IN NEWBORN JAUNDICE(Nobel Ilac, 2014) Kurban, Sevil; Annagur, Ali; Altunhan, Huseyin; Mehmetoglu, Idris; Ors, Rahmi; Erdem, Said Sami; Yerlikaya, Fatma HumeyraObjective: Phototherapy is an efficient and commonly used form of therapy for the treatment of neonatal hyperbilirubinemia. Paraoxonase 1 (PON1) is an anti oxidative enzyme, which eliminates lipid peroxides. The aim of our study was to investigate the effect of phototherapy on serum PON1 activity and total antioxidant capacity (TAC) in hyperbilirubinemic full-term newborns. Material and Method: The study was performed on 40 full-tenn newborns between 3 to 15 days of age exposed to phototherapy. SerumPON1 activity and TAC levels of the babies were determined before and after phototherapy by spectrophotometric assays. Results: We have found that PON1 activity was not significantly affected by phototherapy whereas TAC levels were decreased significantly after phototherapy (p<0.001). Conclusion: Our findings demonstrated that phototherapy has no direct effect on PON1 activity. Also, decreased TAC levels might have resulted from increased oxidative stress which may lead to consumption of antioxidant molecules.Öğe Effects of the Environmental Enrichment on Learning and Memory in High-Fat Diet-Fed Rats(Wiley-Blackwell, 2015) Oz, Mehmet; Demir, Enver Ahmet; Gergerlioglu, Hasan Serdar; Atalik, Kismet Esra Nurullahoglu; Yerlikaya, Fatma Humeyra[Abstract Not Availabe]Öğe Environmental enrichment reverses cognitive impairments provoked by Western diet in rats: Role of corticosteroid receptors(Pergamon-Elsevier Science Ltd, 2016) Gergerlioglu, Hasan Serdar; Oz, Mehmet; Demir, Enver Ahmet; Nurullahoglu-Atalik, Kismet Esra; Yerlikaya, Fatma HumeyraAims: Previous studies demonstrated that the Western diet (WD), which is rich in saturated fat (HFD) and refined sugar (HSU), is related to the impairments of hippocampus-dependent learning and memory and forebrain synaptic plasticity in rodents. The environmental enrichment (EE) has been shown to enhance learning and memory in theHFD-induced cognitive deficits, but the exact mechanismis still not clearly understood. Therefore, the present study aimed to clarify the effects of the EE on spatial memory in WD-fed rats, and to analyze the potential role of corticosteroid receptors in the EE conditioning. Main methods: MaleWistar albino rats were housed in either an enriched or standard environment and fed with the HFD (35% of energy as fat), HSU (100% of carbohydrate as sucrose) or standard rat chowfor 4 weeks. Weused the Morris' water maze test (MWM) to assess the learning and memory performance, and measured plasma levels of corticosterone (CORT) and adrenocorticotropic hormone (ACTH), as well as glucocorticoid (GR) and mineralocorticoid receptor (MR) levels in the hippocampus. Key findings: The results showed that HFD-fed rats displayed poorer learning and memory performance evaluated with MWM than controls. The EE reversed the cognitive deficits caused by the HFD. In addition, the EE resulted in an increase of GR and MR levels without affecting plasma CORT and ACTH concentrations. Significance: Based on these findings, it could be suggested that the EE plays an important role in amelioration of the HFD-induced cognitive impairments, but this intervention is independent of the hypothalamic-pituitaryadrenal axis and hippocampal corticosteroid receptor levels. (C) 2016 Elsevier Inc. All rights reserved.Öğe Evaluation of oxidant/anti-oxidants status in patients with mild acute pancreatitis(Univ Catholique Louvain-Ucl, 2016) Baser, Husniye; Can, Ummugulsum; Karasoy, Deniz; Ay, Abdulhalim Serden; Baser, Salih; Yerlikaya, Fatma Humeyra; Ecirli, SamilBackground and aim : Acute pancreatitis (AP), an inflammatory disorder of the pancreas, is associated with significant morbidity and mortality. The pathogenesis of AP has been suggested to involve high oxidative stress (OS), combined with inadequate antioxidant status. We aimed to investigate the levels of serum total anti-oxidant status (TAS), total oxidant status (TOS) and ischemia-modified albumin (IMA) in patients with mild AP. Methods : Thirty subjects with mild AP and 29 healthy controls were enrolled into the study. The levels of TAS, TOS and IMA, Creactive protein (CRP), high sensitivity CRP (hs-CRP) and fibrinogen were measured in both groups. Results : TAS levels were significantly lower (p = 0.037), while IMA levels were significantly higher (p < 0.001) in patients, compared to controls. TOS levels were similar between two groups. Fibrinogen, CRP and hs-CRP levels were significantly higher in patients than those of controls (p < 0.001 for all parameters). IMA levels were positively correlated with amylase and lipase levels (r = 0.448, p = 0.001 and r = 0.469, p < 0.001, respectively). There was a negative correlation between TAS levels, and amylase and lipase levels (r = -0.277, p = 0.035 and r = -0.278, p = 0.034, respectively). Conclusions : OS is reported to be associated with the inflammatory process and the severity of AP. In our study, among OS parameters, an increase in IMA levels and a decrease in TAS levels were observed in mild AP patients.Öğe Evaluation of subclinical cardiovascular disease by carotid intima media thickness, epicardial adipose tissue thickness, serum endocan, and nesfatin-1 levels in patients with primary hyperparathyroidism(Tubitak Scientific & Technological Research Council Turkey, 2022) Kocabas, Muhammet; Alsancak, Yakup; Can, Mustafa; Cordan, Ilker; Burgucu, Hatice Caliskan; Karakose, Melia; Yerlikaya, Fatma HumeyraBackground/aim: Data on the presence and extent of cardiovascular disease (CVD) risk in primary hyperparathyroidism (PHPT) are conflicting. In our study, we aimed to investigate the increased CVD risk in patients with PHPT by carotid intima-media thickness (CIMT), epicardial adipose tissue (EAT) thickness, and serum levels of endocan and nesfatin-1. Materials and methods: Patients with PHPT (n = 44) and age- and sex-matched healthy control subjects (n = 40) were enrolled in this study. Demographic data of the participants were questioned. Serum endocan and nesfatin-1 concentrations were assessed using commercially available ELISA kits. Noninvasive measurements of CIMT and EAT thickness were made with high-resolution ultrasonography and B-mode echocardiography. Results: There was no statistically significant difference in serum endocan and nesfatin-1 levels and EAT thickness in the PHPT group compared to controls. CIMT was statistically significantly higher in the PHPT group compared to controls (p = 0.001). A negative correlation was found between PTH and low-density lipoprotein cholesterol level (p = 0.001) but no significant relationship was found between other parameters. Conclusion: We found that CIMT is increased in patients with PHPT and consequently, CVD risk is high in these patients. More comprehensive studies are needed to identify other markers that predict increased CVD risk in patients with PHPT.Öğe Impact of enriched environment on production of tau, amyloid precursor protein and, amyloid-? peptide in high-fat and high-sucrose-fed rats(Cambridge Univ Press, 2017) Selvi, Yavuz; Gergerlioglu, Hasan Serdar; Akbaba, Nursel; Oz, Mehmet; Kandeger, Ali; Demir, Enver Ahmet; Yerlikaya, Fatma HumeyraObjective: The Western-type diet is associated with an elevated risk of Alzheimer's disease and other milder forms of cognitive impairment. The aim of the present study was to investigate the effects of the environmental enrichment on amyloid and tau pathology in high-fat and high-sucrose-fed rats. Methods: In total, 40 adult male rats were categorised into two main groups according to their housing conditions: enriched environment (EE, n = 16) and standard housing condition (n = 24). The groups were further divided into five subgroups that received standard diet, high-fat diet, and high-sucrose diet. We performed the analysis of amyloid beta-peptide (A beta) (1-40), A beta(1-42), amyloid precursor protein (APP), and tau levels in the hippocampus of rats that were maintained under standard housing conditions or exposed to an EE. Results: The EE decreased the A beta(1-40), A beta(1-42), APP, and tau levels in high-fat and high-sucrose-fed rats. Conclusion: This observation shows that EE may rescue diet-induced amyloid and tau pathology.Öğe The investigation of levels of endothelial cell-specific molecule, progranuline, clusterin, and human epididymis protein 4 in the differential diagnosis of malignant pleural effusions(Lippincott Williams & Wilkins, 2022) Demirbas, Soner; Yerlikaya, Fatma Humeyra; Yosunkaya, Sebnem; Can, Ummugulsum; Celalettin, KorkmazBackground:Progranulin (PGRN), endothelial cell-specific molecule-1, clusterin (CLU), and human epididymis protein 4 (HE-4) are novel proteins reported to have diagnostic and prognostic potential in lung cancer. Here, we aimed to identify the markers with high sensitivity and specificity in distinguishing malignant pleural fluids from other pleural fluids. Methods:This prospective, descriptive study was conducted at a medical faculty hospital between 2016 and 2019. The study population consisted of 90 patients <18 years of age with pleural effusion (PE). Levels of pleural fluids of PGRN, endothelial cell-specific molecule-1, CLU, and HE-4 were measured with enzyme-linked immunosorbent assay kits under the manufacturer's manual. Results:Of 90 patients, 54 were men, and 36 were women (mean age 65 +/- 16 years). Of pleural fluids investigated, 23 (25%) and 67 (74%) were transudates and exudates, respectively. Of exudates, while 27 (40%) and 19 (28%) were parapneumonic PE and tuberculous PE, respectively, 20 (29%) were malignant pleural effusion (MPE). Levels of all biomarkers in exudate fluids were found significantly higher than those of transudate fluids. CLU, HE-4, and PGRN levels in MPE were also found significantly higher than benign fluids (P < .05). Cutoff values were achieved by receiver operating characteristics analysis for CLU, HE-4, and PGRN to distinguish between malignant and benign groups. For diagnosis of MPE, the sensitivity and specificity values were found as 0.66 and 0.67 for a cutoff value of CLU of 18.29 mg/L (P = .00), as 0.76 and 0.76 for a cutoff value of HE-4 of 9.33 mg/L (P = .00), and as 0.66 and 0.67 for a cutoff value of PGRN of 105.91 mg/L (P = .001). Conclusion:HE-4 having high sensitivity and specificity can be a potential diagnostic marker in distinguishing between malignant and benign effusions, and these findings can constitute a basis for future research.Öğe Obesity Is an Independent Determinant of Ischemia-Modified Albumin(Karger, 2012) Mehmetoglu, Idris; Kurban, Sevil; Yerlikaya, Fatma Humeyra; Polat, HakkiObjective: We have measured ischemia-modified albumin (IMA), total antioxidant status (TAS), total oxidant status (TOS) and high-sensitivity C-reactive protein (hsCRP) levels in obese and normal-weight subjects to investigate if IMA can be used as a biomarker of oxidative stress and inflammation and if IMA was an independent determinant of obesity or not. Methods: The study was performed on 92 obese subjects (20 male, 72 female) aged 38 +/- 11 years and 78 normal-weight controls (19 male, 59 female) aged 37 +/- 11 years. Serum lipids, IMA, TAS, TOS, and hsCRP levels of the subjects were measured. Results: IMA (p < 0.05), TOS (p < 0.001), and hsCRP (p < 0.001) levels of the obese subjects were significantly higher, whereas TAS levels were significantly lower (p < 0.05) than those of the controls after adjustment for age and gender. In the linear regression analysis, waist circumference (r(2) = 0.139, p < 0.01), BMI (r(2) = 0.136, p < 0.01) and insulin (r(2) = 0.120, p < 0.05) were shown to be significant independent determinants of IMA levels. Conclusions: We have found that oxidative stress and inflammation were increased and antioxidative defense was decreased, which resulted in increased levels of IMA, a biomarker of ischemia, in obese subjects. Also, obesity and insulin were found to be independent determinants of IMA. Thus, obese subjects are under high risk of ischemia, and IMA may be used as a biomarker of oxidative stress and ischemia. Further larger investigations are needed to confirm this opinion. Copyright (C) 2012 S. Karger GmbH, Freiburg
