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    Adalimumab mitigates ovarian ischemia-reperfusion injury in rats by regulating oxidative stress, apoptosis and resolution of inflammation
    (Wiley, 2019) Beyazit, Fatma; Buyuk, Basak; Turkon, Hakan; Elmas, Sait; Uzun, Metehan
    Aim Ovarian torsion is a rare but an important reason of acute lower abdominal pain in women and associated with serious morbidity and mortality, if not treated promptly. The aim of this study was to evaluate the effects of an antitumor necrosis factor-alpha antibody on ovarian torsion in a rat model of ischemia-reperfusion (I/R) injury. Methods Forty female Wistar Albino rats were used in the present study. The rats were randomly divided into four groups: group I (sham), group II (I/R), group III (I/R + isotonic saline) and group IV (I/R + adalimumab). The I/R model was induced by torsion of both ovaries. Immunohistochemical staining for interleukin-1 beta (IL-1 beta), nuclear factor-kappa B (NF-kappa B), and inducible nitric oxide synthase was performed. Tissue and serum oxidative stress markers in conjunction with apoptotic index (AI) with the terminal deoxynucleotidyl transferase dUTP nick end labeling method were also calculated. Results Tissue total oxidant status, oxidative stress index and nitric oxide values were significantly decreased, and tissue total antioxidant status was found to be increased in group IV. Inflammation, vascular congestion and hemorrhagia were significantly lower in adalimumab-treated group. Serum oxidative stress markers and tissue malondialdehyde levels did not differ in study groups. The AI was significantly increased in groups 2 and 3. Adalimumab treatment significantly decreased the AI. Conclusion Adalimumab therapy in rats attenuated I/R induced ovarian injury, possibly suppressing inflammation, inhibiting oxidative stress, and altering apoptotic pathways.
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    ADLİ TRAVMATOLOJİK AÇIDAN YARALANMANIN AĞIRLIĞINI BELİRLEMEDE NÖTROFİL LENFOSİT ORANI VE TROMBOSİT LENFOSİT ORANININ ROLÜ
    (2018) Kalkan, Esin Akgül; Çakır, Dilek Ülker; Turkon, Hakan; Gül, Abdülhakim Hasan
    Amaç: Nötrofil lenfosit oranı (NLO) ve trombosit lenfosit oranı (TLO) sistemik inflamasyonu gösteren biyo-belirteçlerdir. Bu çalışmanın amacı, adli travmatolojik açıdan yaralanmanın ağırlığının belirlenmesinde, NLOve TLO’nın rolünü tartışmaktır.Gereç ve yöntem: Bir üniversite hastanesi tıbbi biyokimya laboratuarında, 01.06.2015-01.11.2015 tarihle-rinde etanol analizi yapılmış olan olgular, hastane otomasyon sistemi üzerinden retrospektif olarak belirlen-di. Veriler, hastaların elektronik dosyalarından elde edildi. Olguların, sosyodemografik özellikleri, yaralanma-nın ağırlığı/derecesi, etanol düzeyi, NLO ve TLO değerleri incelendi. Veriler SPSS programında analiz edildi.Bulgular: İncelenen 155 hastanın 133’ü (%85,8) erkek olup yaş ortalaması 36,6± 15,4 yıldı. YT olan olgu-larda NLO ortalaması 9,4±10,9, YT olmayan olgularda 5,1±5,1 saptandı, bu fark istatistiksel anlamlı değildi(p>0,05). Basit tıbbi müdahale (BTM) ile giderilemeyen olguların NLO ortalaması 8,6±8,6 olup, BTM ile gide-rilebilir ve travmatik değişim olmayan gruplara göre daha yüksekti ve Bonferroni düzeltmeli Mann WitneyU testine göre bu farklar anlamlıydı (p=0,0001). Kırık saptanan olgularda NLO ortalaması 8,9±9,4 iken, kırıksaptanmayan olgulara göre daha yüksekti ve bu fark istatistiksel olarak anlamlıydı (p=0,002). TLO ortalamadeğerleri ile gruplar arasında, istatistiksel anlamlı fark saptanmadı (p>0,05).Sonuç: Yüksek NLO değerleri ile yaralanmanın ağırlığı arasında anlamlı bir ilişki mevcuttur. TLO’na göre NLO,adli travmatolojik açıdan yaralanmanın ağırlığını belirlemede yardımcı bir biyobelirteç olarak kullanılabilir.Bu ilişkinin patofizyolojisinin anlaşılması için, daha fazla araştırma yapılması gereklidir.
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    Adropin Levels in Polycystic Ovary Syndrome Patients
    (Derman Medical Publ, 2017) Sen, Hacer; Erbag, Gokhan; Binnetoglu, Emine; Eroglu, Mustafa; Turkon, Hakan; Tekin, Sati Zeynep; Asik, Mehmet
    Aim: Polycystic ovary syndrome (PCOS) is one of the most commonly observed endocrinopathies in women of reproductive age. Women with PCOS are said to have increased classic risk factors for cardiovascular disease, hypertension, dyslipidemia, diabetes, and obesity, in addition to non-classic risk factors such as an increase in C-reactive protein (CRP), homocysteine, and tumor necrosis factor-a. Adropin is a protein thought to play a role in maintaining energy homeostasis and insulin response. The aim of our study is to investigate the relationship between levels of adropin and insulin resistance in PCOS patients with insulin resistance and an increased risk of diabetes. Material and Method: Fifty-seven female patients (30 patients with PCOS and 27 healthy control subjects) were enrolled in this study. All patient's body mass index and insulin resistance were calculated. The adropin levels were measured using commercial kits based on a competitive plasma EIA (enzyme immunoassay) method. Results: The adropin levels in the patient group were 10.79 ng/L, while the value was 13.02 ng/L in the control group, and the difference was statistically significant (p= 0.04). There was a significant negative correlation between the adropin levels and the insulin, aspartate aminotransferase (AST), triglyseride (TG), and homeostasis model assessment of insulin resistance (HOMA-IR) levels (p= 0.03, p= 0.03, p= 0.04, and p= 0.02, respectively). Discussion: In our study, the adropin level which is associated with insulin resistance, was found to be decreased in patients with PCOS. We think that it would be valuable to conduct new studies for the evaluation of adropin related clinical conditions leading to insulin resistance in patients with PCOS.
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    Attenuation of partial unilateral ureteral obstruction - induced renal damage with hyperbaric oxygen therapy in a rat model
    (Brazilian Soc Urol, 2017) Sancak, Eyup Burak; Tan, Yusuf Ziya; Turkon, Hakan; Sılan, Coşkun
    Objective: The objective of the present study was to evaluate the effectiveness of HBO therapy on biochemical parameters, renal morphology and renal scintigraphy in rats undergoing chronic unilateral partial ureteral obstruction (UPUO). Material and methods: Thirty-five rats were divided into five equal groups: Control group; Sham group; HBO group; UPUO group and UPUO/HBO group. The effects of HBO therapy were examined using biochemical parameters and histopathological changes. After calculating the score for each histopathological change, the total histopathological score was obtained by adding all the scores. In addition, dynamic renal scintigraphy findings were evaluated. Results: Serum parameters indicating inflammation, serum tumor necrosis factoralpha, ischemia modified-albumin, IMA/albumin ratio and Pentraxin-3 levels, were observed to be high in the UPUO group and low in the UPUO/HBO treatment group. Similarly, in the treatment group, the reduction in malondialdehyde, total oxidant status and oxidative stress index levels and increase in total antioxidant capacity values were observed to be statistically significant compared to the UPUO group (p< 0.001, p= 0.007, p< 0.001, p= 0.001, respectively). The total score and apoptosis index significantly decreased after administration of HBO treatment. Dynamic 99mTc-MAG3 renal scintigraphy also showed convincing evidence regarding the protective nature of HBO against kidney injury. In the UPUO/HBO therapy group, the percentage contribution of each operated kidney increased significantly compared to the UPUO group (41.73% versus 32.72%). Conclusion: The findings of this study indicate that HBO therapy had a reno-protective effect by reducing inflammation and oxidative stress, and preserving renal function after renal tissue damage due to induction of UPUO.
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    Correlation between calcium and phosphorus in cord blood and birth size in term infants
    (Edizioni Minerva Medica, 2016) Colak, Ayfer; Yildiz, Omur; Toprak, Burak; Turkon, Hakan; Halicioglu, Oya; Coker, Isil
    BACKGROUND: Calcium supplementation during pregnancy was suggested to affect fetal growth. We aimed to investigate the association between calcium and phosphorus in cord blood and birth size parameters in term infants. METHODS: The study included 70 pregnant women and their neonates. Birth weight, birth length and head circumference of the neonates were measured. Cord blood samples were obtained at delivery. Maternal and cord blood calcium, phosphorus and parathyroid hormone were measured. The association between variables was evaluated with Pearson correlation coefficient. RESULTS: Cord blood calcium levels were significantly positively correlated with birth weight, birth length and head circumference (r=0.308 P=0.009, r=0.324 P=0.006, r=0.296 P=0.013 respectively). Cord phosphorus was significantly positively correlated with birth length (r=0.358 P=0.002). In subjects with higher phosphorus levels cord calcium were more strongly correlated with birth weight, birth length and head circumference than in the overall group (r=0.487 P=0.003, r=0.515 P=0.002, r=0.396 P=0.018 respectively). CONCLUSIONS: Cord blood calcium and phosphorus levels are associated with birth size parameters. There may be interactions between calcium and phosphorus to affect fetal growth.
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    CTLA4+rs231775 gene polymorphism increases PCOS, regardless of the levels of interleukin-6 and tumor necrosis factor-? in the serum
    (Bayrakol Medical Publisher, 2023) Beyazit, Fatma; Cicekliyurt, Meliha Merve; Turkon, Hakan; Unsal, Mesut Abdulkerim; Pek, Eren
    Aim: Polycystic ovarian syndrome (PCOS) is a long-standing inflammation-related disease with increased levels of circulating pro-inflammatory markers. By affecting inflammatory cytokine production, cytotoxic T lymphocyte-associated antigen (CTLA-4) polymorphism can alter the immune system and trigger distinct disease states. The aim of the study was to investigate if CTLA4 polymorphism is associated with PCOS, and if so, (2) whether this situation influences serum interleukin-6 (IL-6) and TNF-alpha in PCOS.Material and Methods: CTLA4+rs231775 gene polymorphism with IL-6 and TNF-a levels were determined in 92 PCOS women and 88 healthy controls. Study groups were further subdivided according to body mass index (BMI) and the degree of insulin resistance (IR), and comparisons were made within each study group.Results: The prevalence of the A allele of single nucleotide polymorphism (SNP) rs231775 was more frequent in PCOS women compared with healthy controls [OR: 1.99, 95% CI:1.273-3.107, p =0.0023]. The heterozygous genotype was also shown to be strongly associated with PCOS development [OR: 3.041, 95%CI:1.604-5.766, p=0.0005]. Although TNF-a levels of PCOS patients were detected to be elevated, no difference was found in the study groups with respect to serum IL-6 levels. In addition, no association was observed between CTLA4+rs231775 polymorphism and serum pro-inflammatory cytokine levels.Discussion: The present study demonstrates for the first time that CTLA4+rs231775 gene polymorphism increases susceptibility to PCOS 2 times more in the case of A allele carriage and 3 times more in heterozygous individuals, independent from the long-standing low-grade inflammatory disease state encountered in patients with PCOS.
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    Diagnostic performances of serum liver enzymes and cytokines in non-alcoholic fatty liver disease
    (2014) Turkon, Hakan; Çolak, Ayfer; Toprak, Burak; Yıldız, Coşkun; Hasturk, Aybike; Yıldız, Ömür; Binnetoğlu, Emine
    Amaç: Alkolik olmayan yağlı karaciğer hastalığı gittikçe artan prevalansla dünya çapında insanları etkilemektedir. Bu hastalığın tanısı ve evrelendirilmesi için invaziv olmayan testlere ihtiyaç vardır. Bu çalışmada rutin karaciğer enzimleri ve sitokinlerin alkolik olmayan yağlı karaciğer hastalığında tanısal performanslarını değerlendirmeyi amaçladık.Yöntemler: 20-62 yaşları arasında 88 kişi çalışmaya dahil edildi. Serum ALT, AST, GGT, trigliserid, TNF-alfa, IL-6 ve IL-8 düzeyleri 40 yağlı karaciğer hastası ve benzer VKİ ve demografik özellikleri olan 48 sağlıklı bireyde ölçüldü. Serum biyobelirteçlerinin yağlı karaciğer hastalığındaki tanısal performansları ROC analizi ile değerlendirildi.Bulgular: ALT ve AST tüm grupta yağlı karaciğer hastalığı olan bireyleri belirlemede iyi performans gösterdi (AUC=0,817; %95 CI[0,721-0,913], AUC=0,815; %95 CI[0,718-0,911] sırasıyla) ancak obez bireylerde ALT ve AST zayıf performans gösterdi (AUC=0,659; %95 CI[0,478-0,841], AUC=0,680; %95 CI[0,498-0,861] sırasıyla). Sitokinler arasında TNF-alfa yağlı karaciğer hastalığı tanısında tüm grupta ve obez hastalarda en iyi performansı gösterdi (AUC=0,892; %95 CI[0,824-0,959], AUC=0,858; %95 CI[0,739-0,977] sırasıyla). Tüm grupta TNF-alfa için en iyi cut-off değeri %75 sensitivite ve %93 spesifisite ile 10,65pg/mL bulundu. IL6 ve IL8 zayıf performans gösterdi.Sonuç: TNF-alfa alkolik olmayan yağlı karaciğer hastalarını tespit etmede iyi bir parametre olabilir
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    Does Omegaven have beneficial effects on a rat model of ovarian ischemia/reperfusion?
    (Elsevier Science Bv, 2014) Gungor, Ayse N. Cakir; Turkon, Hakan; Albayrak, Aynur; Ovali, Mehmet; Islimye, Mine; Gencer, Meryem; Hacivelioglu, Servet
    Objective: The beneficial effects of omega-3 fatty acids on an intestinal ischemia/reperfusion (I/R) model was shown previously. Therefore, we aimed to examine the potential beneficial effects of parenteral omega-3 fatty acids, a safe and inexpensive product, on a rat model of ovarian I/R. Study design: A group of 39 rats was divided into six groups. Group 1 (Sham Group; n = 6) underwent two laparotomies with a 3-h interval and their ovaries were removed 3 h later. Group 2 (torsion detorsion Group; n = 7) had their ovaries torsioned clockwise and fixed at 7200; 3 h later a detorsion operation was done and after another 3 h, their ovaries were removed. Group 3 (n = 7) and Group 4 (n = 7) received the same treatment as Group 2; however, half an hour prior to detorsion, these rats received Omegaven at 1 mL/kg and 5 mL/kg, respectively. Group 5 (n = 6) and Group 6 (n = 6) received the same treatment as Group 1; however, half an hour prior to the second laparotomy, these rats received Omegaven at 1 mL/kg and 5 mL/kg, respectively. One ovary from each rat was evaluated histologically by hematoxylin and eosin (H&E) staining and the other ovary was homogenized and evaluated for total oxidant status (TOS), total antioxidant status (TAS) and oxidative stress index (OSI). Results: While we failed to show any significant relationship among groups in oxidative parameters, there was a significant worsening in the torsion detorsion group in histological evaluation. High Omegaven doses, but not low doses, improved tissue injury scores of torsioned and detorsioned ovaries to the levels observed in the control group. Conclusion: Omegaven improves the detrimental effects of ovarian I/R when used in sufficient doses. Its effects and dose adjustment on women with ovarian torsion must be investigated by further studies. (C) 2014 Elsevier Ireland Ltd. All rights reserved.
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    Effects of Melatonin on Blood Pressure, Oxidative Stress and Placental Expressions of TNF?, IL-6, VEGF and sFlt-1 in RUPP Rat Model of Preeclampsia
    (Elsevier Science Inc, 2017) Uzun, Metehan; Gencer, Meryem; Turkon, Hakan; Oztopuz, Rahime Ozlem; Demir, Ufuk; Ovali, Mehmet Akif
    [Anstract Not Available]
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    Effects of Prophylactic Ozone Therapy on General Anesthesia and Surgical Stress Response: Neutrophil/Lymphocyte Ratio and Ischemia-Modified Albumin
    (Int College Of Surgeons, 2019) Toman, Huseyin; Sahin, Hasan; Erbas, Mesut; Turkon, Hakan; Simsek, Tuncer; Kiraz, Hasan Ali; Ozkan, Muhammed Turgut Alper
    General anesthesia and surgical stress cause an acute endocrine, metabolic, and immunologic inflammatory response in organisms and an increase in neutrophil lymphocyte ratio (NLR) and ischemia-modified albumin (IMA) levels. Ozone, other than inhalation administration, reduces the release of antioxidants and some proinflammatory cytokines and has been shown to have an anti-inflammatory effect. Our aim is to research how the NLR and IMA response is affected in rabbits undergoing surgical intervention with general anesthesia given prophylactic with ozone therapy. We divided 12 New Zealand rabbits into 2 groups: group O was given 70 lg/mL 10 mL ozone by the rectal route in 6 sessions on alternate days, and group C was given air by the rectal route. The rabbits underwent surgical intervention under general anesthesia. Blood samples were taken at basal, preoperation, 30 minutes postanesthesia, and 24 hours postoperation and were examined for hemogram and IMA. At 24 hours postoperation, an increase in NLR was observed in both groups, more clearly in group C (P < 0.05). In both groups, comparisons within the groups showed a significant increase in NLR only at 24 hours postoperation compared to other times (P < 0.05).When IMA values were compared, differences between the groups were observed between preoperative values and those at the 30 minutes postanesthesia and 24 hours postoperation (P < 0.05). When general anesthesia and surgical stress response were evaluated using inflammatory parameters of both NLR and IMA, there was significantly less of an increase in levels in rabbits given ozone compared to the control group.
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    Elevated circulating nitric oxide levels correlates with enhanced oxidative stress in patients with hyperemesis gravidarum
    (Taylor & Francis Inc, 2018) Beyazit, Fatma; Turkon, Hakan; Pek, Eren; Ozturk, Filiz Halici; Unsal, Mesut
    Since the biochemical and molecular mechanisms responsible for ongoing oxidative stress in hyperemesis gravidarum (HEG) patients have not yet been fully elucidated, the aim of this study was to evaluate the possible role of nitric oxide (NO), malondialdehyde (MDA) and other oxidative stress markers in the disease pathophysiology. Moreover, the relation between oxidative stress markers and Helicobacter pylori (H. pylori) infection was also investigated. Women with pregnancies complicated by HEG (n=33) were compared with pregnant women without HEG (n=30) and with healthy non-pregnant women (n=31). Serum NO, MDA, total oxidant status (TOS), total antioxidant status (TAS), oxidative stress index (OSI) and H. pylori infection status were determined for each subject. Serum NO levels and OSI index were found to be increased (p=.001 and .013, respectively) and TAS levels were decreased (p<.001) in HEG patients compared with both controls regardless of H. pylori infection status. Serum MDA and TOS levels were not different between the study groups. Helicobacter pylori infection rates were similar in each group. The reduced antioxidant activities, as well as the increased OSI and NO levels in HEG patients indicate possible oxidative stress conditions in HEG patients. Moreover, serum NO levels may be used as an adjunctive marker to distinguish HEG patients from other causes of emesis during pregnancy.Impact statementWhat is already known on this subject? Current evidence suggests that oxidative stress is a significant factor responsible for a number of complications during pregnancy.What do the results of this study add? Hyperemesis gravidarum is an oxidative stress condition, as reflected by increased nitric oxide (NO) and decreased total antioxidant status activity, regardless of H. Pylori infection.What are the implications for clinical practice and/or further research? Full disclosure of the association between circulating NO and hyperemesis gravidarum would shed light on underlying biological mechanisms and could help clinical management of similar pregnancy-associated morbidity states.
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    Evaluation of serum endothelial cell-specific molecule-1 levels and carotid intima-media thickness in patients with ankylosing spondylitis
    (Walter De Gruyter Gmbh, 2016) Turkon, Hakan; Gokmen, Ferhat; Uysal, Sema; Akbal, Ayla; Inceer, Besir Sahin; Resorlu, Mustafa; Gokmen, Esra
    Objective: Ankylosing spondylitis (AS) is a chronic inflammatory disease and the increased mortality in these patients is largely caused by cardiovascular diseases. Endothelial cell-specific molecule-1 (ESM-1) is a novel marker to assess endothelial dysfunction and expressed by the vascular endothelium. In this study, the serum ESM-1 levels in patients with AS and the possible association between serum ESM-1 and carotid intima-media thickness (CIMT) as a marker of atherosclerosis was evaluated. Methods: A total of thirty-seven patients with AS and thirty healthy control subjects were included in this study. ESM-1, erythrocyte sedimentation rate(ESR), C-reactive protein (CRP) and CIMT were measured in all subjects. ESM-1 levels were measured by ELISA method. The disease activity of patients with AS were assessed using questionnaires Bath Ankylosing Spondylitis Functional Index (BASFI) and Bath Ankylosing Spondylitis Disease Activity Index (BASDAI). Results: Serum ESM-1 levels were lower in AS patients than in healthy controls. However, there was no statistically significant difference between ESM-1 levels (304.3 +/- 185.2 vs. 373.9 +/- 206.9 ng/L, respectively; p=0.064). Patients with AS had significantly higher CIMT levels compared with controls (0.77 +/- 0.16 vs. 0.53 +/- 0.09 mm, respectively; p<0.001). While a statistically significant positive correlation was detected in all subjects between CIMT levels and ESR, CRP (r=0.378, p=0.002, r=0.547, p<0.001, respectively), no significant correlation was detected between serum ESM-1 levels and ESR, CRP, BASDAI, BASFI and CIMT. Conclusion: The results showed that CIMT values in AS patients were increased when compared to control group. There was no correlation among ESM-1 levels, disease activity and CIMT. In order to reveal the pathological role of the ESM-1 levels in patients with AS need more studies.
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    Evaluation of the protective effects of hesperetin against cisplatin-induced ototoxicity in a rat animal model
    (Elsevier Ireland Ltd, 2016) Kara, Medine; Turkon, Hakan; Karaca, Turan; Guclu, Oguz; Uysal, Sema; Turkyilmaz, Mehmet; Demirtas, Selim
    Objectives: We aimed to investigate the effects of hesperetin as a flavanon both histopathologically and immunohistochemically on cochlear apoptosis in a rat model of cisplatin-induced ototoxicity (CIO). The evaluation of the effects of hesperetin on cisplatin-induced hearing loss was performed using distortion product otoacoustic emission (DPOAE). Methods: Twenty-eight wistar albino rats were used in the current study. The rats were randomly divided into four groups with seven rats in each group. Group C was exposed to a single dose of cisplatin (12 mg/kg) by intraperitoneal injection. Group CH received intraperitoneally cisplatin (12 mg/kg) and hesperetin (20 mg/kg). Group H was exposed to hesperetin (20 mg/kg) intraperitoneally. The sham group (group S) received normal saline (6 cc) intraperitoneally. The measurements of DPOAE and signal-noise ratios (SNR) were performed before the treatment and again on the first and 6 days after administration of the drugs. Rats were sacrificed and cochleae were dissected 10 days after drug administration. The cochlear tissue was assessed in all groups by histopathologic, immunohistochemical and TUNEL assay. In addition, serum oxidative stress markers and antioxidant parameters were analyzed. Results: There was a significant difference between the basal value and the sixth day at frequencies 8.4, 9.6 and 9.96 for group C. We also found a significant difference between the first and sixth day at frequencies 7.2, 8.4, 9.6 and 9.96. On the 6th day, there were significant differences between C and S groups at all frequencies except 2.4. We showed a significant difference between C and H groups at frequencies 4.8, 6.0, 8.4, 9.6 and 9.96. There was also a significant difference between C and CH groups at frequencies 2.4, and 3.6. We found lower levels of oxidants and higher levels of antioxidants in CH group as compared to C group. C group had a significantly greater number of TUNEL-positive cells than did S, H and CH groups. The number of TUNEL-positive cells in CH group was higher than in S and H groups. There was a significant difference between the positive PCNA cells of CH group compared to S and H groups in spiral ganglion and stria vascularis. In addition, there were no positive PCNA cells in C group. Conclusions: Hesperetin may prevent ototoxicity by increased antioxidant enzymes and reduced oxidant parameters and protected against apoptosis resulting from a proliferation of cochlear cells in CIO. (C) 2016 Elsevier Ireland Ltd. All rights reserved.
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    Farelerde Oluşturulan Romatoid Artrit Leptin Reseptör Antikoru (Obr-Ab) Kullanılarak Tedavi Edilebilir Mi?
    (2017) Edremitlioğlu, Mustafa; Turkon, Hakan; Kılınç, Nihal; Zateri, Coşkun
    Leptinin proinflamatuar bir sitokin gibi davrandığı ve proinflamatuar sitokinlerin saIgısını artırdığı bilinmektedir. Bu nedenle romatoid artrit tablosunu şiddetlendirmesi beklenebilir. Bu çalışmanın amacı, leptin reseptör antikoru verilerek leptin etkisinin önlenmesinin Balb-c farelerdeki artrit gelişimine ve şiddetine etkisini incelemektir. Bu amaçla aşağıdaki şekilde oluşturulan dört grup hayvan kullanılmıştır: 1- Kontrol grubu (K) 2- Artrit grubu (A) 3- Erken dönemde leptin reseptör antikoru verilen artrit grubu (LE) 4- Geç dönemde leptin reseptör antikoru verilen artrit grubu (LG) Artrit oluşturmak için kollajen tip-II antikoru ile uyarılan artrit (CAIA) modeli kullanılmıştır. Leptin reseptör antikoru (OBR IgG) hayvanların bir bölümüne artritin tetiklendiği gün olan 0. günde (LE grubu), bir bölümüne ise 5. günde (LG grubu) uygulanmıştır. Deneye alınan tüm farelerde 20 gün boyunca klinik artrit skorlaması yapılmıştır. Yirminci gün kan ve doku örnekleri alınarak deney protokolü sonlandırılmıştır. Alınan doku örnekleri artrit gelişimi ve şiddeti yönünden histopatolojik skorlama ile ayrıca değerlendirilmiştir. Alınan kan örneklerinden plazma leptin, IL-1?, IL-6, IL-17A, TNF-? düzeyleri ELISA yöntemiyle belirlemiştir. Artrit gelişimi kollajen tip-II antikoru uygulanmasından 5 gün sonra gözlenmeye başlanmış ve 9-10. günlerde en şiddetli halini almıştır. Bu günden sonra yavaşça azalmakla birlikte, 20. günün sonunda hala gözlenebilir düzeyde artrit bulguları kaydedilmiştir. Hem sıfırıncı (LE) hem de beşinci günde (LG) leptin reseptör antikoru uygulanan gruplarda klinik artrit skorunun 7. güne kadar, leptin reseptör antikoru verilmeyen yani sadece artritli gruptaki (A) hayvanlarla benzer olduğu görülmüştür. Buna karşın 8. günden itibaren LE ve LG gruplarındaki klinik artrit skoru deney sonuna kadar A grubundan daha düşük seyretmiştir. Histopatolojik skorlamada LE ve LG gruplarında pannus oluşumu ve kıkırdak hasarında anlamlı olmayan ve minimal bir azalma gözlendi. Plazma leptin ve sitokin düzeylerinde gruplar arasında her hangi bir fark gözlenmedi. Elde edilen sonuçlar, leptin reseptör antikoru uygulanmasının artrit şiddetini azaltmada etkili olabileceği konusunda ümit vermektedir. Bu konuda daha büyük deney gruplarının kullanıldığı ileri çalışmalara gerek vardır.
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    Hyperbaric oxygen treatment ameliorates gentamicin-induced nephrotoxicity and expression of kidney injury molecule 1 in the rat model
    (Undersea & Hyperbaric Medical Soc Inc, 2019) Oztopuz, Ozlem; Turkon, Hakan; Sehitoglu, Muserref Hilal; Buyuk, Basak; Uzun, Metehan; Ovali, Mehmet Akif; Demir, Ufuk
    In recent years, hyperbaric oxygen (HBO2) therapy has been considered as an effective method for the treatment of gentamicin (GM)-induced renal toxicity. However, the findings related to the use of HBO2 for GM toxicity are limited and contradictory. The aim of this study is to investigate the protective role of HBO2 on GM-induced nephrotoxicity. For this purpose, Wistar albino rats (n=28) were randomly divided into four equal groups: C, HBO2, GM and GM+HBO2. GM (100 mg/kg, ip) and HBO2 were applied over seven days. On the eighth day blood and kidney tissue samples were harvested. The albumin, creatinine, and urea levels were determined from serum samples. Superoxide dismutase (SOD), glutathion peroxidase (GSH-Px) activities, malondialdehyde (MDA), total antioxidant status (TAS) and total oxidant status (TOS) values were analyzed spectrophotometrically. The relative expression level of TNF-alpha, IL-1 beta and Kim-1 gene were determined by qRT-PCR assays; histopathologic investigation was completed in kidney tissue samples. Serum urea, albumin and creatinine levels significantly increased in the GM group compared to the GM+HBO2 group. For antioxidant parameters the GM+HBO2 group was not statistically different from the C group but was significantly different compared with the GM group. TNF-alpha, IL-1 beta and Kim-1 gene expression levels in the GM group were statistically increased compared to the GM+HBO2 group (p=0.015, p=0.024, p=0.004) respectively. Severe tubular necrosis, epithelial desquamation and mild peritubular hemorrhage were observed in the GM-administrated group, while HBO2 exposure ameliorated these alterations. In conclusion, HBO2 exposure may be defined as a potential method for the prevention of GM-induced renal toxicity.
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    Increased Levels of Serum Ischemia Modified Albumin in Patients with Ankylosing Spondylitis
    (Clin Lab Publ, 2016) Turkon, Hakan; Gokmen, Ferhat; Cakir, Dilek Ulker; Sehitoglu, Muserref Hilal; Resorlu, Hatice; Doner, Davut; Essizoglu, Ertan
    Background: The aim of the study was to investigate oxidant/antioxidant status by determining serum ischemia-modified albumin (IMA) levels with oxidative/antioxidant parameters in patients with ankylosing spondylitis (AS) compared to the controls. Methods: The serum concentrations of IMA, IMA/albumin ratio (IMAR), malondialdehyde (MDA), total oxidant status (TOS), oxidative stress index (OSI), superoxide dismutase (SOD), glutathione peroxidase (GPx), and total antioxidant capacity (TAC) were measured in 40 AS patients and 35 healthy controls. Results: Mean serum IMA, IMAR, MDA, TOS, and OSI levels were increased in patients with AS when compared to the control group (p < 0.05 for all). Serum levels of SOD and GPx were significantly lower in the patient group than in the healthy subjects (p < 0.001 for both). Serum TAC levels were decreased in patients with AS compared to the controls but the statistical difference was not significant. Serum IMA levels were found to be positively correlated with BASDAI, BASFI, BASMI, and ASDAS-CRP (r = 0.356, r = 0.370, r = 0.412, r = 0.353, respectively, and p < 0.05 for all). IMAR values showed significant correlations with BASFI, BASMI, and ASDAS-CRP (r = 0.351, p = 0.026; r = 0.400, p = 0.010; and r = 0.379, p = 0.016, respectively). Conclusions: Depletion in antioxidant systems and overproduction of free radicals leading to formation of the oxidative stress may play a role in the development of AS. Increased levels of IMA might provide important contributions to the underlying oxidative stress in AS.
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    Investigation of Blood Betatrophin Levels in Obese Children with Non-Alcoholic Fatty Liver Disease
    (Korean Soc Pediatric Gastroenterology & Nutrition, 2018) Battal, Fatih; Turkon, Hakan; Aylanc, Nilufer; Aylanc, Hakan; Yildirim, Sule; Kaymaz, Nazan; Uysal, Sema
    Purpose: The prevalence of obesity has significantly increased among children and adolescents worldwide and is becoming an important health care problem in parallel with the increased prevalence of obesity pediatric non-alcoholic fatty liver disease. Betatrophin is a newly define hormone that is commonly secreted by liver and plays role in glucose tolerance. This study aimed to investigate the relationship between serum betatrophin levels and non-alcoholic fatty liver disease in obese children. Methods: The study included 40 obese children with a body mass index (BMI) above 95th centile, and 35 non-obese subjects with a BMI 3-85th centile, whose age and gender were similar to those of the patient group. For the evaluation of metabolic parameters fasting serum glucose, insulin, alanine aminotransferase, aspartate aminotransferase, lipid profile and serum betatrophin levels were measured. Total cholesterol: high-density lipoprotein cholesterol and low-density lipoprotein cholesterol: high-density lipoprotein cholesterol ratios were calculated as atherogenic indices. Results: Serum betatrophin levels of the obese subjects were similar to that of non-obese subjects (p=0.90). Betatrophin levels were not correlated with the metabolic parameters. Conclusion: In the present study, levels of betatrophin are not different between obese and insulin resistant children and non-obese subjects, and they are not correlated with atherogenic indices. To elucidate the exact role of betatrophin in obesity, further studies are required to identify the betatrophin receptor and/or other possible cofactors.
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    Ischemia modified albumin levels and its association with clinical follow-up in acute renal failure
    (2017) Uzun, Mehmet; Topaloğlu, Ömercan; Kurtulmuş, Yusuf; Turkon, Hakan; Duman, Can; Karakas, Burak; Akar, Harun
    Aim: In cases with acute ischemia, albumin’s binding capacity for transition metals decreases and the resulting albumin is defined as ischemia modified albumin (IMA). In this study, we aimed to investigate the relationship between IMA and clinical follow-up in patients with acute renal failure (ARF).Material and Methods: Levels of IMA were measured in 51(23 male, 28 female) patients with ARF. Venous blood samples were drawn from patients for biochemical tests and put in plain tubes containing the gel.Results: Mean age of male and female patients was 65.39±15.28 and 70.11±15.25, respectively. The IMA levels in 25.5% of the patients were within the normal range (<400 ABSU), while the IMA levels were higher (>400 ABSU) in 75.5% of the patients. The survival rates of patients in IMA <400 ABSU group for 12 and 24 months were 66.7% and for 30 and 32 months it was 33.3%; while the survival rates of patients in IMA ?400 ABSU group for 12 months were 85.8%, for 24 months were 61.3%, and for 30 and 32 months were 30.6%. No significant difference was determined among survival rates of IMA groups (p=0.719).Conclusion: The comparison between the groups having normal or higher IMA values did not show any significant differences in terms of survival. However, in our study the proportion of patients who needed dialysis during treatment were significantly higher in higher IMA group(IMA?400 ABSU). Therefore, we believe that higher IMA levels may indicate a necessity for dialysis in patients with ARF.
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    Major Ozonated Autohemotherapy Preconditioning Ameliorates Kidney Ischemia-Reperfusion Injury
    (Springer/Plenum Publishers, 2016) Sancak, Eyup Burak; Turkon, Hakan; Cukur, Selma; Erimsah, Sevilay; Akbas, Alpaslan; Gulpinar, Murat Tolga; Toman, Huseyin
    Medical ozone has therapeutic properties as an antimicrobial, anti-inflammatory, modulator of antioxidant defense system. Major ozonated autohemotherapy (MOA) is a new therapeutic approach that is widely used in the treatment of many diseases. The objective of the present study was to determine whether preischemic application of MOA would attenuate renal ischemia-reperfusion injury (IRI) in rabbits. Twenty-four male New Zealand white rabbits were divided into four groups, each including six animals: (1) Sham-operated group, (2) Ozone group (the MOA group without IRI), (3) IR group (60 min ischemia followed by 24 h reperfusion), and (4) IR + MOA group (MOA group). The effects of MOA were examined by use of hematologic and biochemical parameters consisting of neutrophil to lymphocyte ratio (NLR), interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-alpha), ischemia-modified albumin (IMA), total antioxidant status (TAS), total oxidant status (TOS), and oxidative stress index (OSI). In addition, the histopathological changes including the tubular brush border loss (TBBL), tubular cast (TC), tubular necrosis (TN), intertubular hemorrhage and congestion (IHC), dilatation of bowman space (DBS), and interstitial inflammatory cells infiltration (IECI) were evaluated. In the IR group, compared to the Sham group, biochemical parameters indicating oxidative stress, NLR, IL-6, TNF-alpha, IMA, TOS, and OSI have increased. MOA reduced inflammation and oxidative stress parameters. Although TAS values have decreased in the IR group and increased in the MOA-pretreated group, no significant changes in TAS values were detected between the IR and MOA groups. The total score was obtained by summing all the scores from morphological kidney damage markers. The total score has increased with IR damage when compared with the Sham group (13.83 +/- 4.30 vs 1.51 +/- 1.71; p = 0.002). But, the total score has decreased significantly after application of MOA (5.01 +/- 1.49; p = 0.002; compared with the IR group). MOA preconditioning is effective in reducing tissue damage induced in kidney ischemia-reperfusion injury. The protective effect of MOA is mediated via reducing inflammatory response and regulating of reactive oxygen species (ROS). Renal histology also showed convincing evidence regarding MOA's protective nature against kidney injury induced renal ischemia-reperfusion. Consequently, MOA might be helpful in protecting the kidneys from IR-induced damage in humans, probably through the anti-inflammatory effect and reducing the total oxidant status.
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    May ischemia modified albumin be a predictor in diagnosis of contrast induced nephropathy?
    (2018) Topaloğlu, Ömercan; Demir, Bilgin; Ekinci, Ferhat; Uzun, Mehmet; Kurtulmuş, Yusuf; Turkon, Hakan; Duman, Can
    Aim: “Ischemia modified albumin” (IMA) was investigated as a possible biomarker in several diseases such as vascular disorders. We aimed to reveal the possible value of IMA in predicting the development of contrast induced nephropathy (CIN) after coronary angiography in patients with stable angina pectoris.Material and Methods: 106 patients underwent coronary angiography with a diagnosis of stable angina pectoris were included in our study. Basic demographic and clinical findings and laboratory values were recorded and analyzed. Serum creatinine (SCre) levels were also measured 48 hours after coronary angiography and recorded. Amount of contrast agent (CA) given during coronary angiography was recorded. The patients were divided into 2 groups: CIN positive and CIN negative groups.Results: CIN was developed in 14 patients (13%); and IMA levels were similar in CIN positive and negative groups (p>0.05). SCre (both measurements before and after CA administration) was not correlated with IMA levels. There was no association between drug usage and development of CIN (p>0.05). Comorbidities were not associated with the development of CIN (p>0.05) with the exception of hypertension (HT). Presence of hypertension (p=0.0393) and female gender (p=0.0199) was associated with development of CIN. Mean age was 61.3 and 52.3 in CIN positive and negative groups, respectively (p>0.05).Conclusion: Any specific biomarker indicating CIN is not available yet. Most frequently used marker is the measurement of SCre 24- 48 hours after administration of CA. We found IMA levels not to be a predictor for the development of CIN. Further investigations will clearly determine the importance of IMA as a biomarker in renal failure developed after CA administration.