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    EVALUATION OF OXIDATIVE STRESS, 3-NITROTYROSINE, AND HMGB-1 LEVELS IN PATIENTS WITH WET TYPE AGE-RELATED MACULAR DEGENERATION
    (Soc Medical Biochemists Serbia, 2022) Zor, Kursad Ramazan; Sari, Ismail; Bicer, Gamze Yildirim; Gunturk, Inayet; Kucuk, Erkut; Ersan, Serpil; Seydel, Gonul Seyda
    Background: This study aims to compare serum HMGB-1, 3-nitrotyrosine (3-NT), TAS, TOS, and OSI levels in Wettype Age-Related Macular Degeneration (wAMD) patients and healthy controls to determine the correlation of these parameters with each other. Methods: Thirty patients with Wet-type Age-Related Macular Degeneration (wAMD) and 27 healthy adults, as controls were enrolled in the study. We determined the TAS and TOS levels in serum samples of both groups using commercial kits on a microplate reader. Serum HMGB-1 and 3-NT levels were measured with the enzyme-linked immunosorbent assay method. Results: HMGB-1 levels were significantly higher in the patient group (137.51 pg/mL, p=0.001), while there was no difference between the two groups in serum 3-NT levels (p = 0.428). A statistically significant difference found in the levels of TOS and OSI (p = 0.001 and p = 0.045, respectively) between the patients and controls, however, no significant difference was observed between the groups in terms of TAS levels (p = 0.228). Conclusions: Oxidative stress and HMGB-1 levels were increased in wAMD patients and enhanced oxidative stress may be associated with increased tissue necrosis and inflammation. Thus administration of antioxidant treatment in addition to routine therapy should be considered in wAMD.
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    Evaluation of physical and vital signs and the effect of carnosine in experimental hyperthyroidism
    (Cukurova Univ, Fac Medicine, 2022) Dagli, Fatma; Gunturk, Inayet; Seydel, Gonul Seyda; Yazici, Cevat
    Purpose: This study aims to investigate the effects of experimental hyperthyroidism and carnosine which is known to have antioxidant properties on physical and vital findings in rats, and to determine the relationship between these parameters and free T3 (FT3) levels. Materials and Methods: Rats were analyzed in 7 groups (each containing 12 animals); control (CONT), hyperthyroidism-1 (T:10-day L-thyroxine (L-T4) administration), hyperthyroidism-2 (T-T: 20-day L-T4 administration), Carnosine (10 day carnosine administration), Hyperthyroidism-1 + Carnosine (T-C), Hyperthyroidism-2 + Carnosine (T-TC), and Carnosine + Hyperthyroidism-1 (C-T). In order to create a hyperthyroidism model, L-thyroxine (L-T4) doses of 300 mu g/kg rat weight/day and carnosine doses of 300 mu g/kg rat weight/ day were intraperitoneally (ip) administered to the rats. Results: After 10 and 20 days of thyroxine administration, FT3 levels (T:3.64 +/- 0.51pg/mL, T-T: 4.06 +/- 0.91pg/mL) and body temperature (T:37.1 +/- 0.3oC, T-T: 37.6 +/- 0.3oC), significantly increased while body weight decreased (T:240.7 +/- 22.0g, T-T:263 +/- 0.28.7g). Carnosine administration only prevented the increase of FT3 levels, but had no effect on other parameters. Conclusion: The increased FT3 levels observed with LT4 administration were consistent with the physical and vital findings, but carnosine administration did not reflect the expected effects on the physical findings observed in the hyperthyroid condition.
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    Evaluation of the relationship between disease severity and the leptin, adiponectin, and chemerin levels in overweight and obese COVID-19 patients
    (Bayrakol Medical Publisher, 2024) Seydel, Gonul Seyda; Gunturk, Inayet; Yazici, Cevat; Topaloglu, Ulas Serkan; Eren, Esma Eryilmaz; Yuksel, Recep Civan
    Aim: Overweight and obesity are substantial risk factors in the severity of COVID-19 disease. This study aimed to assess the relationship between the disease severity and leptin, adiponectin, and chemerin levels in overweight and obese COVID-19 patients. Material and Methods: The study involved 60 COVID-19 patients (patient group) and 30 healthy controls with BMI >= 25. The patient group was split into two subgroups based on disease severity (30 mild/moderate and 30 severe/critical patients). The levels of leptin, adiponectin, and chemerin in plasma were determined using the ELISA technique. Results: Our study revealed that leptin levels were considerably increased in both groups of COVID-19 patients compared to the healthy controls, while chemerin levels were decreased. In adiponectin levels, there was no statistically significant difference between the groups. Discussion: Plasma leptin and chemerin levels are associated with the progression and/or severity of disease in overweight and obese COVID-19 patients.
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    Investigation of miR-144-3p expression levels in HbSS cases with high and normal HbF
    (Walter De Gruyter Gmbh, 2021) Guzelgul, Figen; Seydel, Gonul Seyda; Alparslan, Zeliha Nazan; Aksoy, Kiymet
    Background: Sickle cell anemia (HbSS) is a hereditary blood disease that affects millions of people worldwide. Increased the HbF levels affects the clinical course of HbSS positively. The aim of this study was to investigate the association between miR-144-3p and HbSS. Materials and methods: In this study 84 cases (44 HbSS/HbS combination and 40 HbAA) were performed. The expression of miR-144-3p was determined by RT-PCR. Statistical analysis was performed by the Mann-Whitney U test (SPSS 20.00 for Windows and p<0.005). Results: The miR-144-3p expression levels were higher in the HbSS cases (p <= 0.001). Additionally, it was determined that the expression of miR-144-3p was higher in the cases with HbF<3 (p=0.043). Discussion: In our study, the increase in the miR-144-3p levels in low HbF levels may be associated with the severity of the disease. Conclusion: Considering these results, suppressing miR144-3p may be considered as a new treatment option in HbSS.
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    Prevalence of Hemoglobinopathies in Premarital Screening in the Province of Nigde, Turkey
    (Taylor & Francis Ltd, 2023) Seydel, Gonul Seyda; Ayan, Durmus; Balci, Tevfik; Bayraktar, Muhammet; Gunturk, Inayet
    Hemoglobinopathies are one of the most widespread hereditary disorders in Turkey. The present study aimed to determine the prevalence of hemoglobinopathies in the Nigde province of Turkey. This study was conducted with 2013 individuals who applied for the premarital screening, between January 2019 and December 2021. The complete blood count was measured by an automated hematology analyzer. The types of hemoglobin were determined by high-performance liquid chromatography. A total of 2013 individuals including 951 (47.2%) females and 1062 (52.8%) males, were screened within the premarital screening program, and 67 (3.3%) of them were migrants. 53 out of 2013 (2.63%) individuals were identified as beta thalassemia carriers, and five of them were migrants including two from Afghanistan, two from Iran, and one from Georgia. HbC was observed in two cases, a couple from Syria (0.1%), HbD in two cases (0.1%), HbE in one case from Thailand (0.05%), HbS-beta-thalassemia in one case (0.05%), delta-beta thalassemia in one case (0.05%), and unidentified structural variant in one case (0.05%). Moreover, 183 individuals (9.1%) were considered to have iron deficiency, alpha-thalassemia, or silent beta-thalassemia carrier. These results indicate that the province of Nigde is a relatively risky region regarding hemoglobinopathies. Geographic location and immigrant population may have slightly affected the local prevalence of hemoglobinopathies and could be taken into consideration to ensure the effective implementation of the hemoglobinopathy prevention program.
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    Response to chronic sustained hypoxia: increased cytosolic gelsolin and decreased plasma gelsolin levels
    (Springer, 2024) Gunturk, Inayet; Kuloglu, Nurhan; Seydel, Gonul Seyda; Yazici, Cevat; Basaran, Kemal Erdem; Yakan, Birkan; Karabulut, Derya
    An actin binding protein, gelsolin (GSN) has two isoforms, plasma (pGSN) and cytosolic (cGSN). Changes in pGSN and/or cGSN levels have been shown to be associated with the pathogenesis of several diseases. The aim of this study was to evaluate changes in intracellular and extracellular GSNlevels with HIF-1 in animals exposed to chronic sustained hypoxia (CSH), in addition to apoptosis and the cellular redox status. The rats in the Sham group were exposed to 21% O-2, and the rats in the hypoxia groups were exposed to 13 and 10% O-2, respectively. Plasma pGSN, HIF-1 alpha, Total Antioxidant Status (TAS) and Total Oxidant Status (TOS), and lung tissue pGSN, HIF-1 alpha, TAS, TOS, GSN levels, and apoptotic cell numbers were measured. HIF-1 alpha levels were found to increase significantly in the tissue, especially in the group with severe hypoxia, both in biochemical and histological examinations. pGSN levels were also significantly decreased in both plasma and tissue. Significant increases in tissue were observed in cGSN. It was observed that while the antioxidant activity was dominant in the tissue, the oxidant activity was dominant in the plasma. In particular, the response to hypoxia regulated by HIF-1 is very important for cellular survival. The results of this study showed that the increase in cGSN and TAS levels in the lung tissue together with HIF-1 alpha can be considered as the activation of mechanisms for cellular protection.
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    The effect of hemoglobin variants on high-performance liquid chromatography measurements of glycated hemoglobin
    (Kare Publishing, 2021) Seydel, Gonul Seyda; Guzelgul, Figen
    Objectives: Glycated hemoglobin (HbA1c) is routinely utilized to monitor long-term glycemic control. The presence of hemoglobin (Hb) variants may lead to a false HbA1c measurement. This study was an investigation of the effects of both common and rare Hb variants on the level of HbA1c measured with high-performance liquid chromatography (HPLC). Methods
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    The relationship between the new inflammatory markers and disease severity in patients with acute coronary syndrome
    (Taylor & Francis Ltd, 2024) Seydel, Gonul Seyda; Gunturk, Inayet; Akkaya, Hasan; Gunturk, Ertugrul Emre
    BackgroundInflammation plays a crucial role in the progression of acute coronary syndrome.AimsThe aim of this study was to investigate the relationship between the SYNTAX score and new inflammatory markers including albumin-globulin ratio (AGR), C-reactive protein-to-albumin ratio (CAR), fibrinogen-to-albumin ratio (FAR), neutrophil-to-albumin ratio (NAR), and neutrophil percentage-to-albumin ratio (NPAR) in STEMI and NSTEMI patients.MethodsThe study involved 53 STEMI and 64 NSTEMI patients, and each patient group was evaluated separately. Multivariate linear regression analysis was utilised to identify independent risk factors associated with SYNTAX scores.ResultsOut of the 64 NSTEMI patients, 42 had low SYNTAX score (65.6%), and 22 had high SYNTAX score (34.4%). Patients with high SYNTAX scores had significantly higher levels of age, glucose, fibrinogen, monocyte, and FAR, and lower levels of albumin and total protein. We found that FAR and monocyte levels were independent predictors of the high SYNTAX score. The study also determined that the cut-off value for FAR as 9.99, with a sensitivity of 81% and a specificity of 73% for predicting high SYNTAX score in NSTEMI patients. Out of the 53 STEMI patients, 42 had low SYNTAX score (79.2%), and 11 had high SYNTAX score (20.8%). Patients with high SYNTAX scores exhibited significantly higher total cholesterol, LDL, and glucose levels, and lower albumin and total protein levels.ConclusionsThe FAR level is significantly linked with the high SYNTAX score and can be a useful marker for predicting the severity of disease in NSTEMI patients.