Characteristic symptoms of hyperthyroidism include weight loss, heart palpitation, and sweating. Thyroid hormones (TH) can stimulate thermogenesis through central and peripheral mechanisms. Previous studies have shown an association between dysfunction of cardiotrophin-like cytokine factor 1 (CLCF1) and cold-induced sweating syndrome, with recent research also indicating a link between CLCF1 and brown adipose tissue thermogenesis. However, it remains unclear whether CLCF1 and TH have synergistic or antagonistic effects on thermogenesis. This study aims to investigate the influence of thyroid hormone on circulating CLCF1 levels in humans and explore the potential possibilities of thyroid hormone in regulating energy metabolism by modulating Clcf1 in mice. By recruiting hyperthyroid patients and healthy subjects, we observed significantly lower serum CLCF1 levels in hyperthyroid patients compared to healthy subjects, with serum CLCF1 levels independently associated with hyperthyroidism after adjusting for potential confounders. Tissue analysis from mice treated with T3 revealed a decrease in CLCF1 expression in BAT and iWAT of C57BL/6 mice. These findings suggest that TH may play a role in regulating CLCF1 expression in adipose tissue.
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