Endocrine Abstracts

A 62-year-old man with insulin treated type 2 diabetes presented with atrial fibrillation. Despite anticoagulation he suffered an embolic cerebellar infarct ten days later. He was found to have abnormal thyroid function tests (TSH 7.75 mu/l, free T4 49.3 pmol/l, free T3 12.0 pmol/l). Thyroid function test analysis was repeated in a second laboratory confirming the results above. TSH was stimulated by thyrotrophin releasing hormone, confirming thyroid hormone resistance. Magnet...

Thyroid hormones are important regulators of metabolism and development. Iodothyronine selenodeiodinases can both activate and inactivate thyroid hormones (Bianco et al. 2002) thus in vitro assays to quantify deiodinase inhibition are considered to be a valuable tool for studying effects on thyroid hormone metabolism by potential endocrine disruptors. The prohormone thyroxine (T4) is converted to 3, 5, 3’-triiodothyronine (T3) by outer-ring deiodination,...