Endocrine Abstracts

Introduction: So far, only two representatives of thyronamines, namely 3-iodothyronamine (3-T1AM) and the iodine–free thyronamine (T0AM), have been detected in vivo. While intensive research is done on the (patho-) physiological function of 3-T1AM, the physiological role of T0AM is poorly studied. Conflicting data have been reported for the acute cardiac effects of T0AM. This project therefore determined whet...

Background: Thyroid hormones (THs) stimulate hepatic de-novo lipid biosynthesis but also lipolysis and beta-oxidation. Similarly, they simultaneously enhance cholesterol uptake, biosynthesis, and degradation. Thyroid hormone receptor beta (THRβ) is the main hepatic thyroid hormone receptor. Mammals have developed a circadian timekeeping system that controls physiological processes to adapt to time-of-day.HypothesisWe hypothesized that TH effects are subject to circadian r...

Cellular 24-hour rhythms depend on transcriptional programs controlled by a set of circadian clock genes/proteins. Systemic factors like humoral and neuronal signals, oscillations in body temperature, and food intake align physiological circadian rhythms with external time. Thyroid hormones (THs) are major regulators of circadian clock target processes such as energy metabolism, but little is known about how fluctuations in TH levels affect the circadian coordination of tissue...

Thyroid hormones (TH) play a pivotal role in embryonal and postnatal development in vertebrates, hence, their secretion is highly regulated. In clinical practice TSH and free T4 (fT4) are commonly used as the most reliable parameters to evaluate the TH status. But they only represent the TH receptor β driven status of the hypothalamic-pituitary-thyroid axis while organ or tissue specific TH availability may be different. This discrepancy originates in the tissue specific ...