Yazar "Yelkovan, Izzet" seçeneğine göre listele

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    Effect of tumour necrosis factor-alpha and interleukin-6 promoter polymorphisms on course of Crimean-Congo hemorrhagic fever in Turkish patients
    (WOLTERS KLUWER MEDKNOW PUBLICATIONS, 2015) Yilmaz, Meral; Elaldi, Nazif; Bagci, Binnur; Sari, Ismail; Gumus, Erkan; Yelkovan, Izzet
    Objective: In this case-control study, we investigated whether IL-6 (-174G/C) and TNF-alpha (-308G/A) gene polymorphisms affect the clinical course and outcome of CCHF. Methods: Total 150 patients with CCHF and 170 controls were examined in this study. Genotyping of these polymorphisms were performed by PCR-RFLP methods. Results: We found no statistically significant differences in genotype and allele frequencies of these polymorphisms between patients and controls [(chi(2) = 1.31, p = 0.51 for TNF-alpha) and (chi(2)=2.61, p = 0.27 for IL-6)]. Either TNF-alpha AA or IL-6 CC genotypes in dead cases were not observed in this study. Frequency of heterozygous genotypes in both IL-6 (GC) and TNF-alpha (GA) was higher in dead patients than living patients. However, the difference was not statistically significant. A significant difference was found in AST levels and INR when compared to patients with CCHF who died and who survived [OR = 13.9 (95% CI = 1.79-107) for INR, p = 0.01] and [OR = 23.3 (95% CI = 3.62-149) for AST, p = 0.001], respectively. Conclusion: We did not find a significant association of IL-6 -174G/C and TNF-alpha -308G/A polymorphisms on the prognosis of CCHF and mortality in this study. We suggest that AST and INR may be important biomarkers for determining the risk of severity and death as a result of infection with Crimean-Congo hemorrhagic fever virus (CCHFV).
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    Relationship between IFNA1, IFNA5, IFNA10, and IFNA17 gene polymorphisms and Crimean-Congo hemorrhagic fever prognosis in a Turkish population range
    (WILEY, 2016) Elaldi, Nazif; Yilmaz, Meral; Bagci, Binnur; Yelkovan, Izzet; Bagci, Gokhan; Gozel, Mustafa Gokhan; Engin, Aynur; Bakir, Mehmet; Dokmetas, Ilyas
    Crimean-Congo hemorrhagic fever (CCHF) is a fatal emerging acute viral infection. Not much is known regarding the pathogenic mechanisms and the reasons behind severe or mild disease courses in CCHF. IFN-alpha (IFNA) is one of the essential cytokines in the immune system. Existence of single nucleotide gene polymorphisms (SNPs) in cytokines can cause susceptibility or resistance to viral agents and different clinical courses. Hence, the relationship between SNPs in genes encoding cytokines (IFNA1 -1823G/A (rs1332190), IFNA5 -2529T/A (rs758236), IFNA10 Cys20stop (rs10119910), and IFNA17 Ile184Arg (rs9298814) SNPs and disease susceptibility were investigated. The associations between SNPs and CCHF prognosis were also studied. Total 150 patients with CCHF and 170 healthy individuals were enrolled. Genotyping was performed by PCR-RFLP methods. The frequency of IFNA1 -1823 (rs1332190) GG genotype was significantly higher in control subjects than CCHF patients (20% vs. 8%; P=0.01). For IFNA17 Ile184Arg (rs9298814) polymorphism, CCHF patients having TG genotype had a higher frequency than the control subjects (38% vs. 32.4%; P=0.039). The distribution of TT+TG genotype frequencies was also significantly higher in CCHF group than the controls (97.3% vs. 91.8%; P=0.049). Genotype and allele frequencies for IFNA subtypes between fatal and survivors were the same (P>0.05). Genotype and allele frequencies between severe and mild/moderate CCHF patients were also the same (P>0.05). The results show that IFNA1 rs1332190 and IFNA17 rs9298814 SNPs may play an important role in CCHF susceptibility. Determining the existence of other connections for IFNA SNPs and CCHF severity and fatality requires further investigations. J. Med. Virol. 88:1159-1167, 2016. (c) 2015 Wiley Periodicals, Inc.
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    The investigation of some enzyme levels in the kidney, spleen, heart, liver and brain of Dami?nozi?de admi?ni?stered rats
    (University of Ankara, 2005) Göze, Ismihan; Yelkovan, Izzet; Bakir, Sevtap; Çinar, Ziynet
    In this study, it was aimed to examine possible changes in enzyme activities and total protein levels in tissues of rats given daminozit at the dose of 150 mg/kg/day for 15. days introperitonly. Rats were killed by cervical dislocation on the end of 15 day. total protein (TP), alanin amino transferase (ALT), laktate dehidrogenase (LDH), alkaline fosfatase (ALP), gamma glutamil transpeptidaz (GGT), aspartat amino transaminaz (AST) enzyme activities were measured In prepared homogenates of spleen, kidney, heart, liver and brain tissues by Ciba Corning Express Plus autoanalyzer. GST enzyme was studied by spectrofotometric assay. The data of experimental group was compared with those of control rats. There were no statisticallyt differences between experimental group and control group in terms of enzymes in liver and kidney (p>0.05). There were significant differences in experimental group compared to control rats in spleen TP (u=32;p<0.05) and GGT (u-36;p<0.05) in heart GST (u=36;p<0.05) and brain GST (u=36;p<0.05) and GGT (u=32;p<0.05) enzymes (p<0.05), but the other enzyme activities did not show significant differences between two group (p>0.05).