Endocrine Abstracts

Thyroid hormones T4 and T3 regulate many different physiological processes in different tissues in vertebrates. Most of the actions of thyroid hormones are mediated by the thyroid hormone receptor (TR), which is a member of the nuclear receptor superfamily of ligand-activated transcription regulators. There are two different genes that encode two different TRs, TR alpha and TR beta, and these two TRs are often co-expressed at different levels in different...

3-iodothyronamine (T1AM) is an endogenous thyroid hormone derivative which produces profound metabolic effects such as a shift in fuel substrate utilization from carbohydrates to lipid. Thus, in the present work we investigated the effects of T1AM on hepatic glucose metabolism.To assess metabolite release, human hepatocellular carcinoma cells (HepG2) were exposed for 4 h to different concentrations of exogenous T1AM (0.1, 1 and 10 μM) in glucose pro...

Vitamin D deficiency is widespread among all age and ethnic groups. Serum 25-hydroxyvitamin D [25(OH)D] is the most reliable marker of vitamin D status. Adequate levels of serum 25(OH)D are necessary to sustain the pleiotropic effects of vitamin D, either skeletal (classical) or extra-skeletal (non-classical). Concentration levels ≧50 nmol/L (20 ng/ml) are required for optimal musculoskeletal health. However, levels above 75 nmol/L (30 ng/ml) may be necessary to maximiz...

Introduction: 3-Iodothyronamine (T1AM) is a novel endogenous relative of thyroid hormone able to interact with specific G protein-coupled receptors, known as trace amine-associated receptors (TAAR). Metabolic, endocrine and cardiac effects of exogenous T1AM have been reported.Methods: We synthesized radiolabelled T1AM, [125I]-T1AM, and explored its distribution in different mouse organs after injection in the tail vein. The specificity of [<su...

3-iodothyronamine (T1AM) is a recently discovered fast-acting thyroid hormone derivative. To date, the physiological effects of endogenousT1AM remain elusive, although there is increasing interest in its physiological function and pharmaceutical potential due to the role it plays in lipid and glucose metabolism (1.2).The present study monitored the effect of weeklong, daily, low dose T1AM administration on weight and metabolism in spontaneously...