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KOÇYİĞİT, ABDÜRRAHİM

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ABDÜRRAHİM
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Start date: 2010 × End date: 2019 × Subject: DNA ×

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Now showing 1 - 3 of 3
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    PublicationOpen Access
    Effect of Montelukast Monotherapy on Oxidative Stress Parameters and DNA Damage in Children with Asthma
    (2015-01-01) DILEK, Fatih; Ozkaya, EMİN; Kocyigit, ABDÜRRAHİM; Yazici, MEBRURE; KESGIN, Siddika; GEDIK, Ahmet Hakan; Cakir, ERKAN; ÖZKAYA, EMİN; KOÇYİĞİT, ABDÜRRAHİM; YAZICI, MEBRURE; ÇAKIR, ERKAN
    Background: There is ample knowledge reported in the literature about the role of oxidative stress in asthma pathogenesis. It is also known that the interaction of reactive oxygen species with DNA may result in DNA strand breaks. The aim of this study was to investigate if montelukast monotherapy affects oxidative stress and DNA damage parameters in a population of pediatric asthma patients. Methods: Group I consisted of 31 newly diagnosed asthmatic patients not taking any medication, and group II consisted of 32 patients who had been treated with montelukast for at least 6 months. Forty healthy control subjects were also enrolled in the study. Plasma total oxidant status (TOS) and total antioxidant status (TAS) were measured to assess oxidative stress. DNA damage was assessed by means of alkaline comet assay. Results: The patients in both group I and group II had statistically significant higher plasma TOS (13.1 ± 4 and 11.1 ± 4.1 μmol H2O2 equivalent/liter, respectively) and low TAS levels (1.4 ± 0.5 and 1.5 ± 0.5 mmol Trolox equivalent/liter, respectively) compared with the control group (TOS: 6.3 ± 3.5 μmol H2O2 equivalent/liter and TAS: 2.7 ± 0.6 mmol Trolox equivalent/liter; p < 0.05). DNA damage was 18.2 ± 1.0 arbitrary units (a.u.) in group I, 16.7 ± 8.2 a.u. in group II and 13.7 ± 3.4 a.u. in the control group. There were statistically significant differences only between group I and the control group (p < 0.05). Conclusions: According to the findings, montelukast therapy makes only minimal but not statistically significant improvement in all TOS, TAS and DNA damage parameters.
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    PublicationOpen Access
    DNA damage and oxidative status in PFAPA syndrome
    (2015-10-01) TUGRUL, Selahattin; Dogan, REMZİ; Kocyigit, ABDÜRRAHİM; Torun, EMEL; SENTURK, EROL; Ozturan, ORHAN; TUĞRUL, SELAHATTİN; DOĞAN, REMZI; KOÇYİĞİT, ABDÜRRAHİM; TORUN, EMEL; ŞENTÜRK, EROL; ÖZTURAN, ORHAN
    Objective: PFAPA syndrome is a clinical entity of unknown etiology which presents with periodic episodes of fever, aphthous stomatitis, tonsillitis or pharyngitis, and cervical adenitis. In this study we investigated DNA damage and the oxidative stress parameters in patients diagnosed with PFAPA, to elucidate the underlying pathophysiological mechanism of this syndrome. Methods: Thirty-one patients diagnosed with PFAPA (Group 1), 22 patients diagnosed with normal tonsillitis or pharyngitis (Group 2), and 20 healthy volunteers (Group 3) were included in our study. Heparinized peripheral blood samples were drawn from all patients and volunteers. DNA damage was assessed by single cell alkaline electrophoresis assay in peripheral mononuclear leukocytes. Plasma levels of total antioxidant status (TAS) and total oxidative status (TOS) were determined by using a novel automated measurement method, and oxidative stress index (OSI) was calculated. Results: DNA damage in the mononuclear leukocytes of Group 1 was significantly higher than that of Group 2 and Group 3. The oxidative stress parameters revealed that the TOS and OSI values of Group 1 were significantly higher than those of Group 2 and Group 3. TAS values of Group 1 were significantly lower than those of Group 2 and Group 3. Correlation analysis of Group 1 demonstrated a significant correlation between TOS, one of the oxidative stress parameters, and DNA damage. Correlations between DNA damage and C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR) values were also significant. Conclusion: Our study indicated that both the inflammatory and the oxidative stress parameters were significantly increased in patients with PFAPA syndrome, accompanied by a significant positive correlation between DNA damage and oxidative stress.
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    PublicationOpen Access
    Peripheral mononuclear leukocyte DNA damage, plasma prolidase activity, and oxidative status in patients with benign prostatic hyperplasia
    (2015-07-01) Gecit, Ilhan; Meral, Ismail; Aslan, Mehmet; Uyuklu, MEHMET; Taskin, Abdullah; Kaba, Mehmet; Pirincci, Necip; Gunes, Mustafa; Taken, Kerem; Demir, Halit; Ceylan, Kadir; MERAL, İSMAİL; KOÇYİĞİT, ABDÜRRAHİM; ÜYÜKLÜ, MEHMET
    Objectives: Prolidase plays a major role in collagen turnover, matrix remodeling, and cell growth. Benign prostatic hyperplasia (BPH) may be associated with an increased extracellular matrix deposition. Therefore, the present study was designed to investigate the plasma prolidase activity, oxidative status, and peripheral mononuclear leukocyte DNA damage in patients with BPH.