Person: ÇAĞMAN, ZEYNEP
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Publication Metadata only Reference intervals for growth arrest-specific 6 protein in adults(2017-01-01T00:00:00Z) Cagman, Zeynep; Ozakpinar, Ozlem Bingol; Cirakli, Zeynep; Gedikbasi, Asuman; Ay, Pinar; Colantonio, David; Uras, Ahmet Riza; Adeli, Khosrow; Uras, Fikriye; ÇAĞMAN, ZEYNEPThe objective of this study was to establish reference intervals for growth arrest-specific 6 (GAS6), a vitamin K-dependent protein, in human adult plasma according to the Guideline of Clinical and Laboratory Standards Institute (CLSI) C28-A3. Blood samples were collected from 308 healthy volunteers aged 18-72 (157 female, 151 male). A non-parametric approach was used to calculate the reference interval. The plasma GAS6 reference interval was determined, with 90% confidence interval: the lower limit (2.5 percentile) was 2.5 (1.9-3.1) g/L and the upper limit (97.5 percentile)=18.8 (18.0-22.3) g/L. Harris-Boyd-s test did not suggest partitioning by age or gender: medians for males [7.8 (5.8-10.7) g/L] and females [9.9 (7.1-13.5) g/L]. Three age-subgroups were tested: 18-29 years (n=168); 30-44 years (n=73); 45-72 years (n=67). The intra- and inter-assay variations were 12.6% (mean, 5.2 +/- 0.7g/L) and 14.0% (mean, 9.2 +/- 1.3g/L), respectively. The mean recovery was 104%. This study reports plasma GAS6 reference intervals established first according to the guideline of CLSI C28-A3.Publication Open Access Gas6 expression and Tyrosine kinase Axl Sky receptors: Their relation with tumor stage and grade in patients with bladder cancer(2021-06-01T00:00:00Z) Akgül, Hacı Murat; Baykan, Özgür; Çağman, Zeynep; Özyürek, Mustafa; Tinay, İlker; Akbal, Cem; Uras, Fikriye; Türkeri, Levent; ÇAĞMAN, ZEYNEPObjectives: It has been shown that the dysregulation of tyrosine kinase Axl receptor and its ligand growth arrest-specific gene (Gas6) are associated with poor prognosis in various types of tumors but there is not enough study about their importance in bladder cancer (BC). We evaluated the relation of Gas6 gene expression and tyrosine- kinase Axl and Sky (Tyro 3) receptors with tumor stage and grade in patients with BC. Material and methods: The study group consists of 55 patients whose transurethral resection of bladder (TUR-B) has been performed due to BC and the control group consists of 12 patients with normal bladder mucosa. In tissues mRNAs of Gas6, Axl, and Sky receptors were examined by quantitative (Real-Time) PCR (qPCR). Protein expression was measured by immunohistochemistry. Plasma Gas6 protein levels were compared with control group by ELISA method. Results: Patients with BC were grouped as Ta low (n=17), Ta high (n=5), T1 low (n=9), T1 high (n=8) and T2 (n=16) according to their TUR-B pathologies. The qPCR analysis showed that the expression of Gas6 gene and Axl receptor is higher in the tumor-positive group and the immune-histochemical showed that the bladder samples of the tumor-positive group stained significantly positive. When the patients are grouped according to the TUR-B pathologies, a statistical significant difference was observed among groups in the qPCR analysis ratios of Gas6 gene and Axl receptor by (p < 0.05) but no significance was found for Sky receptor (p > 0.05). When Gas6 protein levels in plasma samples were compared by ELISA method, a statistical significance was determined among groups (p = 0.001). Conclusions: Our findings indicate that mRNAs of Gas6 and Axl receptor are closely related to tumor stage and grade in patients with BC. Further studies are needed for understanding the role of Gas6 and its receptors on the neoplastic transformation in terms of novel biomarkers and potential therapeutic targets.Publication Metadata only Growth Arrest-Specific 6 and Cardiometabolic Risk Factors in Patients with Psoriasis(2015-04-01T00:00:00Z) SÜNBÜL, MURAT; Cagman, Zeynep; Gerin, Fethullah; ÖZGEN, ZÜLEYHA; Durmus, Erdal; Seckin, Dilek; Ahmad, Sarfraz; Uras, Fikriye; Agirbasli, Mehmet; ÇAĞMAN, ZEYNEPObjectivesAn increased risk for cardiovascular disease with psoriasis has been reported. Growth Arrest-Specific 6 (GAS6) amplifies pro-inflammatory endothelial cell activation via TAM receptors. However, it also inhibits inflammation by multiple mechanisms including phagocytosis. The objective of this study was to investigate whether plasma GAS6 levels are associated with conventional cardiometabolic (CM) risk factors in patients with psoriasis.Publication Metadata only Plasma growth arrest-specific 6 levels in term and preterm newborns(2018-01-01T00:00:00Z) Alp, Emel Eksi; Altinkaya, Nuvit; Cagman, Zeynep; Uras, Fikriye; ÇAĞMAN, ZEYNEPObjective: Growth Arrest-Specific 6 (GAS6) is a vitamin K-dependent protein. Despite a similar structure to Protein S, it has no anticoagulant activity. An association between GAS6 and some diseases for adults has been reported. In the absence of prospective clinical studies of GAS6 in neonates, so far, the objective of this study is to obtain, for the first time, plasma GAS6 levels before and after vitamin K1 prophylaxis in full-term and pre-term newborns.Methods: 80 newborns (40 term and 40 preterm) were recruited for this study. Cord blood samples and peripheral blood samples 48h after vitamin K1 injection were collected into EDTA-tubes. GAS6 levels were measured in platelet-poor plasma by ELISA.Results: Cord blood plasma GAS6 levels in preterm and term newborns were 9.075.30ng/mL and 9.75 +/- 4.34ng/mL, respectively. In response to vitamin K1 injection, GAS6 levels increased in preterm newborns (10.50 +/- 5.28ng/mL) (p.05).Conclusion: This pilot study provided, to the best of our knowledge, the first report that GAS6 levels increased significantly after vitamin K1 prophylaxis in preterm newborns but not in term infants. This study may serve as a first step toward more extensive studies in neonates.Publication Open Access Association of plasma growth arrest-specific protein 6 (Gas6) concentrations with albuminuria in patients with type 2 diabetes(2014-06-01T00:00:00Z) Erek-Toprak, Aybala; Bingol-Ozakpinar, Ozlem; Karaca, Zeynep; Cikrikcioglu, Mehmet Ali; Hursitoglu, Mehmet; Uras, Ahmet Riza; Adeli, Khosrow; Uras, Fikriye; ÇAĞMAN, ZEYNEPAims: New biomarkers are required to detect diabetic nephropathy earlier in persons with type 2 diabetes mellitus. Recent experimental studies indicate that growth arrest-specific protein 6 (Gas6) may have a role in pathogenesis of complications associated with diabetes. The objective of the current study is to examine whether plasma Gas6 concentrations are associated with albuminuria in persons with type 2 diabetes mellitus. Methods: About 32 patients with diabetes which have micro or macroalbuminuria, 37 patients with diabetes and normoalbuminuria, and 30 healthy volunteers were recruited. Plasma Gas6 levels were measured by ELISA. Hemoglobin A(1c) (HbA(1c)), serum C reactive protein, fibrinogen and 24-h urine samples for microalbuminuria were analyzed by Primus PDQ, Beckman Coulter Immage 800, STA Compact and Roche Cobas Integra 800 analyzer, respectively. Statistical analysis was performed using SPSS (Statistical Package for Social Sciences) for Windows 11.5. Results: There was a noteworthy difference among the three groups for Gas6 according to the Kruskal-Wallis test (p<0.01). Plasma Gas6 concentrations were higher in patients with micro or macroalbuminuria [20.9 ng/mL (16.7-27.0); median (25-75% percentile)] compared to patients with normoalbuminuria [16.5 ng/mL (13.1-22.9)], and healthy controls [15.3 ng/mL (8.3-33.6)]. Conclusions: In conclusion, this is the first study indicating that plasma Gas6 levels are associated with albuminuria in patients with type 2 diabetes. This study could be considered a starting point to focus on the association between Gas6 and diabetic nephropathy.