The effects of overt hypothyroidism on adipose tissue and serum betatrophin levels
Keywords:Hypothyroidism, Betatrophin, Lipoprotein lipase
Aim: Betatrophin, also known as angiopoietin-like peptide-8, is an adipokine in glycoprotein structure synthesized from adipose tissue and liver. Betatrophin plays a role in fat and energy metabolism by inhibiting lipoprotein lipase, the key enzyme in the hydrolysis of plasma lipoproteins. Although thyroid hormones have an active role in energy metabolism, their relationship with cholesterol and lipid metabolism is not clear. In our study, we aimed to investigate the relationship of serum betatrophin levels with energy and lipid metabolism in patients with overt hypothyroidism.
Methods: This is a case-control study. The mean age of 44 patients (20 males, 24 females) with hypothyroidism was 44.7 (13.8). A total of 40 healthy volunteers, including 19 males and 21 females, were included in the study as a control group. The mean age of healthy volunteers was 44.6 (14.4) years. Fasting blood glucose, AST, ALT, urea, creatinine, TSH, free T3, free T4, HDL-cholesterol, LDL-cholesterol, triglyceride (TG), total cholesterol, anti-TPO, anti-TG, insulin, HOMA-IR levels and serum betatrophin levels were measured by ELISA and compared in both groups.
Results: Serum betatrophin levels were significantly higher in patients diagnosed with hypothyroidism compared to the control group (P=0.001). Serum betatrophin levels were positively correlated with TSH, TG and total cholesterol, and negatively correlated with HDL, free T3 and free T4 levels. There was no significant difference in the comparison of patients regarding anti-TPO levels in the hypothyroidism group (P=0.78).
Conclusion: In our study, we found that serum betatrophin levels were high in hypothyroid patients. This study may be useful in the development of treatments targeting betatrophin in clinical practice.
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Copyright (c) 2019 Murat Akarsu, Şengül Aydın Yoldemir, Özgür Altun, Okan Dikker, Mustafa Özcan, Eylem Özgün Çil, Semih Kalyon, İlkim Deniz Toprak, Gazi Çapar, Yücel Arman, Tufan Tükek
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