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    Serum irisin and apelin levels and markers of atherosclerosis in patients with subclinical hypothyroidism
    (Sbem-Soc Brasil Endocrinologia & Metabologia, 2019) Yasar, Hamiyet Yilmaz; Demirpence, Mustafa; Colak, Ayfer; Yurdakul, Leman; Zeytinli, Merve; Turkon, Hakan; Ekinci, Ferhat
    Objective: In this study, we aimed to evaluate serum irisin and apelin levels in patients with subclinical hypothyroidism (SCH) when they were subclinical hypothyroid and become euthyroid after levothyroxine therapy and association of these adipokines with markers of atherosclerosis such as serum homocysteine levels and carotid intima-media thickness (IMT). Subjects and methods: The study included 160 patients with newly diagnosed subclinical hypothyroidism due to Hashimoto's thyroiditis and 86 euthyroid healty subjects. Serum glucose and lipid profile, insulin, HOMA, TSH, free T3, free T4, anti-thyroperoxidase and anti-thyroglobulin antibodies, homocysteine, apelin and irisin levels were measured in all study subjects. Thyroid and carotid ultrasound examinations were performed. The subclinical hypothyroid group was reevaluated after 12-weeks of levothyroxine therapy when they became euthyroid. Results: Clinical characteristics of the patient and control group were similar. Glucose, insulin and HOMA levels, lipid parameters and free T3 were similar between the two groups.. Serum homocystein was higher and apelin was lower in patients with SCH, but irisin levels were similar between the two groups. While thyroid volume was lower, carotid IMT was significantly greater in patients with SCH (pCarotidIMT: 0,01). After 12-weeks of levothyroxine therapy, all the studied parameters remained unchanged except, serum freeT4, TSH, homocystein and apelin. While homocystein decreased (p: 0,001), apelin increased significantly (p = 0,049). In multivariate analysis, low apelin levels significantly contributed to carotid IMT (p = 0,041). Conclusions: Apelin-APJ system may play a role in vascular and cardiac dysfunction in patients with SCH and treatment of this condition may improve the risk of cardiovascular disease.
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    The effect of sleeve gastrectomy on serum irisin levels in patients with morbid obesity
    (Via Medica, 2016) Demirpence, Mustafa; Yilmaz, Hamiyet; Colak, Ayfer; Yalcin, Hulya; Toprak, Burak; Turkon, Hakan; Ugurlu, Levent
    Introduction: Irisin, a recently identified myokine, is associated with increased energy expenditure and has a potential role in obesity. Therefore, we investigated circulating irisin levels in morbidly obese patients undergoing sleeve gastrectomy (SG). Materials and methods: Thirty morbidly obese patients undergoing SG and 30 healthy subjects were included. All participants were evaluated at baseline and again at three months post-SG. Body weight and height, the lipid profile, and plasma glucose, HbA1c, insulin, and irisin levels were measured at each visit. Results: The two groups had similar mean age and sex distribution. Serum irisin was significantly lower in the morbidly obese subjects compared with the controls (p - 0.003) and negatively correlated with BMI, body weight, insulin levels, and HOMA-IR (p - 0.006, p = 0.011, p = 0.046, p = 0.048, respectively). When the morbidly obese patients were re-evaluated three months post-SG, their weight and BMI had significantly decreased (both p = 0.001). Similarly, the insulin, HbA1c, HDL-cholesterol, and HOMA-IR values significantly decreased (p - 0.001, p - 0.028, p - 0.006, and p - 0.001, respectively). However, irisin levels remained unchanged (p = 0,267). Conclusion: Although the irisin levels were significantly lower in the morbidly obese subjects, they did not change after SG-induced weight loss.