Browsing by Author "Yilmaz, Mehmet"

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Comparison of Orexigenic and Anorexigenic Neuropeptide Levels in Hyperemesis Gravidarum Patients With Normal Pregnant Women: a Prospective Cohort Study
(Lippincott Williams & Wilkins, 2024) Yilmaz, Mehmet; Aksin, Serif; Balsak, Deniz; Aboalhasan, Yasmin; Batmaz, Ibrahim
Background: The aim of this study was to determine whether orexigenic neuropeptides, orexin and galanin, and anorexigenic neuropeptides, alpha-melanocyte-stimulating hormone (alpha-MSH) and cocaine- and amphetamine-regulated transcript (CART), are implicated in hyperemesis gravidarum (HG). Methods: Fifty pregnant women who had been diagnosed with HG between April 2022 and February 2023 at the Siirt University Faculty of Medicine Training and Research Hospital (tertiary center) were recruited for this study. An equal number of pregnant women without an HG diagnosis were included in the study as the control group. Participants' age, pregnancy history, medical history, thyroid function test results, complete blood count results, and electrolyte levels were recorded, and their orexin, galanin, alpha-MSH, and CART serum levels were analyzed using an enzyme-linked immunosorbent assay. Results: No statistically significant differences in orexigenic neuropeptides (orexin and galanin) were observed between the HG and control groups. A statistical difference was found between an anorexigenic neuropeptide (alpha-MSH) and the control group (P = .012). Based on a receiver operating characteristic analysis, the alpha-MSH parameter was statistically significant for distinguishing between participants with an HG diagnosis and those without, with a sensitivity of 63.6%, specificity of 65.9%, and cutoff value of 11769.3 pg/mL (P = .012, area under curve: 0.655). Based on the severity classification of ketonuria (ketonuria levels of +1 or +2 were classified as mild, whereas levels of +3 or +4 were classified as moderate to severe), the anorexigenic CART neuropeptide was found to be a statistically significant diagnostic indicator of severe ketonuria (P = .020). Conclusion: alpha-MSH and CART levels were found to be related in HG patients and in HG patients with severe ketonuria.
Evaluation of Visceral Adipokines: Omentin, Vaspin, and Visfatin in Patients With Gestational Diabetes Mellitus
(Imr Press, 2024) Yilmaz, Mehmet; Aksin, Serif; Bozbay, Nizamettin; Balsak, Deniz; Aboalhasan, Yasmin; Kurnuc, Fatma Zehra; Batmaz, Ibrahim
Background: Gestational diabetes mellitus (GDM) is a common metabolic disorder characterized by glucose intolerance that develops during pregnancy. The underlying pathophysiological mechanisms of GDM involve complex interactions between genetic, environmental, and hormonal factors, including adipokines secreted by visceral adipose tissue. Omentin, vaspin, and visfatin are adipokines believed to influence insulin sensitivity and inflammation, though their precise relationship with GDM remains unclear. This study aimed to examine the association between these adipokines and GDM. Methods: This single-center, prospective controlled cohort study included 87 pregnant patients diagnosed with GDM via an oral glucose tolerance test (OGTT) between the 24th and 28th weeks of gestation, along with 87 control subjects without GDM. Serum levels of omentin, vaspin, and visfatin were measured using enzyme-linked immunosorbent assay (ELISA), and their association with GDM was analyzed. Results: Our results demonstrated that omentin levels were significantly higher in the GDM group compared to the control group (p = 0.012), while no significant differences were observed in vaspin and visfatin levels (p > 0.05). An omentin cut-off value of 29.0 ng/mL predicted GDM with 59.1% sensitivity and 59.1% specificity, suggesting its potential as a biomarker for GDM. Conclusions: This study underscores the unique role of omentin in GDM, in contrast to the non-significant changes observed in vaspin and visfatin levels. The elevated omentin levels in GDM patients suggest its potential as a biomarker for diagnosing and managing GDM. Further research is needed to elucidate the mechanisms through which omentin contributes to the pathophysiology of GDM.