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    Evaluation of ACE2 and AT2R Polymorphisms in Patients with Asthma
    (Wiley-Blackwell, 2015) Ayada, Ceylan; Toru, Umran; Genc, Osman; Sahin, Server; Taskin, Emre; Yasar, Zehra; Bulut, Ismet
    [No abstract available]
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    Evaluation of multidrug resistance-1 gene C > T polymorphism frequency in patients with asthma
    (Hospital Clinicas, Univ Sao Paulo, 2015) Toru, Umran; Ayada, Ceylan; Genc, Osman; Yasar, Zehra; Sahin, Server; Taskin, Emre; Bulut, Ismet
    OBJECTIVES: Asthma is a chronic inflammatory lung disease characterized by bronchial hyperresponsiveness and airflow obstruction. Genetic and oxidative stress factors, in addition to pulmonary and systemic inflammatory processes, play a pivotal role in the pathogenesis of asthma. The products of the multidrug resistance-1 gene protect lung tissue from oxidative stress. Here, we aimed to evaluate the association between the multidrug resistance-1 gene C>T polymorphism and asthma with regard to oxidative stress-related parameters of asthmatic patients. METHODS: Forty-five patients with asthma and 27 healthy age-matched controls were included in this study. Blood samples were collected in tubes with ethylenediaminetetraacetic acid. DNA was extracted from the blood samples. The multidrug resistance-1 gene polymorphism was detected by polymerase chain reaction and a subsequent enzyme digestion technique. The serum levels of total oxidant status and total antioxidant status were determined by the colorimetric measurement method. RESULTS: The heterozygous polymorphic genotype was the most frequent in both groups. A significant difference in the multidrug resistance-1 genotype frequencies between groups indicated an association of asthma with the TT genotype. A significant difference between groups was found for wild type homozygous participants and carriers of polymorphic allele participants. The frequency of the T allele was significantly higher in asthmatic patients. The increase in the oxidative stress index parameter was significant in the asthma group compared with the control group. CONCLUSIONS: The multidrug resistance-1 gene C/T polymorphism may be an underlying genetic risk factor for the development of asthma via oxidant-antioxidant imbalance, leading to increased oxidative stress.
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    Visfatin and ghrelin: can they be forthcoming biomarkers or new drug targets for asthma?
    (E-Century Publishing Corp, 2015) Toru, Umran; Ayada, Ceylan; Genc, Osman; Sahin, Server; Arik, Ozlem; Acat, Murat; Bulut, Ismet
    Background & aim: Asthma represents chronic inflammation of the airways and is associated with bronchial hyperresponsiveness and reversible airway obstruction. A novel adipokine visfatin and an appetite-modulating hormone ghrelin play a role in several diseases related with inflammation. Although visfatin is a pro-inflammatory adipokine, ghrelin mainly exerts anti-inflammatory effects. However, very little is known about the role of visfatin and ghrelin in asthma. In the present study, we aimed to investigate the role of visfatin and ghrelin in asthma by evaluating their serum levels in asthmatic patients. Materials and methods: This study was performed on 27 asthma and 23 healthy controls. Blood samples were collected in tubes without EDTA. Serum levels of visfatin and ghrelin were measured by human ELISA assay kits. Statistical analyses were performed by SPSS 16.0 package program and differences were considered statistically significant at p < 0.05. Results: Serum levels of visfatin and ghrelin were significantly higher in asthma group (respectively; p = 0.001, p = 0.002). Conclusion: While visfatin has a pro-inflammatory role, ghrelin exerts an anti-inflammatory effect in asthma. Therefore, visfatin can be a forthcoming biomarker and ghrelin may be a new anti-inflammatory drug target to diagnose and treat asthmatic patients.