Browsing by Author "Fidan, Yasemin"

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    Association of Plasma GDF-9 or GDF-15 Levels with Bone Parameters in Polycystic Ovary Syndrome
    (2015) Berberoglu, Zehra; Aktas, Aynur; Fidan, Yasemin; Yazici, Ayse Canan; Aral, Yalcin; 0000-0002-3132-242X; 24430093; AAS-6810-2021
    We aimed to determine plasma levels of growth and differentiation factor (GDF)-9 and GDF-15, and their possible association with bone turnover parameters and bone mineral density (BMD), in patients with polycystic ovary syndrome (PCOS). Forty-two obese PCOS women aged 25-35 years, 23 women with idiopathic hirsutism (IH) and 20 healthy controls matched for age and body mass index were enrolled. Anthropometric, metabolic and hormonal patterns, plasma GDF-9 and GDF-15 concentrations, bone turnover markers and BMD were measured. No significant differences were observed in bone turnover markers, BMD measurements, plasma GDF-9 and GDF-15 levels in subjects with PCOS compared with the other two groups. In the combined population of all three groups, GDF-15 concentrations were negatively correlated with osteocalcin (r = -0.317, p < 0.01). Analysis of PCOS patients showed a significant correlation of GDF-15 concentrations with age and homeostasis model assessment index (r = 0.319, p < 0.05, and r = 0.312, p < 0.05, respectively). In addition, GDF-15 concentrations were negatively correlated with osteocalcin (r = -0.395, p < 0.01) and positively correlated with urine deoxypyridinoline (r = 0.353, p < 0.05). GDF-9 did not correlate with bone markers and BMD measurements. In conclusion, plasma GDF-9 and GDF-15 levels as well as bone turnover markers and BMD measurements in subjects with PCOS (25-35 years of age) were comparable with those either in subjects with IH or in healthy controls with similar anthropometric and metabolic profiles. GDF-15 might be a marker of a crossregulation between bone and energy metabolism.
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    Higher Levels of Circulating CXCL-9 and CXCL-11 in Euthyroid Women with Autoimmune Thyroiditis and Recurrent Spontaneous Abortions
    (2014) Aktas, Aynur; Berberoglu, Zehra; Fidan, Yasemin; Yazici, Ayse Canan; Koc, Gonul; Aral, Yalcin; Ademoglu, Esranur; Bekdemir, Handan; Alphan, Ziynet; https://orcid.org/0000-0002-3132-242X; 24351073; AAS-6810-2021
    Background: We aimed to measure serum CXCL-9 and CXCL-11 levels in patients with autoimmune thyroiditis (AIT) and recurrent spontaneous abortions (RSA). Methods: Forty-one euthyroid, non-pregnant women with AIT and a history of unexplained first trimester RSA, 35 euthyroid women with AIT, and 29 healthy controls matched for age and body mass index were enrolled. Serum CXCL-9 and CXCL-11 were measured. Results: Serum CXCL-9 and -11 levels were significantly higher (p<0.001 for both) in the antibody-positive women with a history of abortions than in both control groups. Additionally, CXCL-9 levels were higher in patients with AIT without RSA than in healthy controls. No significant differences were found in CXCL-9 and -11 levels in subjects with a history of RSA in relation to the number of previous abortions. In multiple linear regression analyses, abortions were significantly related to CXCL-9 (beta-coefficient = 0.174, p<0.001), CXCL-11 (beta-coefficient = 0.490, p<0.001). Conclusion: Higher circulating levels of CXCL-9 and -11 have been shown in non-pregnant AIT patients with a history of RSA as compared to both control groups, suggesting that this subgroup produce a more dominant Th-1 cytokine profile.