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Hypothalamic Integration Mechanisms, Netherlands Institute for Neuroscience (NIN), Amsterdam, Amsterdam, the Netherlands
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Introduction Thyroid hormone (TH) is a major determinant of basal metabolic rate as well as glucose and lipid metabolism ( Mullur et al . 2014 , Sinha et al . 2014 ). A number of recent studies have shown that in addition to the well
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Introduction Thyroid hormones (THs) play an important role in the functional organisation of the cerebellum. Distinct cerebellar cell types depend on adequate TH levels as well as a correct timing of TH access to coordinate key cellular events
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Introduction Thyroid hormones are involved in the regulation of growth, metabolism, heat production, gonadal development, molting, migration, and hatching in birds ( McNabb 2000 ). Thyroid-stimulating hormone (TSH) plays an important
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Introduction Thyroid hormones (THs) are critical regulators of cellular differentiation, growth and metabolism. The thyroid secretes 100% of circulating thyroxine (T 4 ). However, it provides a low percentage of serum levels of the most
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Introduction Thyroid hormone (TH) is crucial for the development and metabolism of many tissues. Thyroid stimulating hormone (TSH) controls the production and secretion of TH by the thyroid gland, which predominantly produces the pro
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thyroid hormones. Studies in rats on the existence of a daily oscillating pattern of thyroid hormones in the circulation have, however, not been quite unequivocal, although most favour a diurnal peak of thyroxin (T4) and triiodothyronine (T3) during the
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ABSTRACT
Circulating free thyroid hormone concentrations are reduced in subjects taking long-term phenytoin, a finding at variance with their euthyroid clinical state and normal serum TSH concentration. It is suggested, therefore, that phenytoin may modify the cellular effects of thyroid hormones.
In order to examine the influence of phenytoin on thyroid hormone action in the pituitary gland we studied its effect on the binding of tri-iodothyronine (T3) to isolated nuclei prepared from rat anterior pituitary tissue. Phenytoin inhibited the nuclear binding of T3 in a dose-dependent fashion. Phenytoin also partially inhibited thyrotrophin-releasing hormone-stimulated TSH release from cultured rat anterior pituitary cells. These studies provide evidence for a direct effect of phenytoin on the thyrotroph mediated via nuclear T3 receptor binding.
J. Endocr. (1985) 104, 201–204
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, predominantly from animal studies, also suggests a direct reciprocal relationship exists between the thyroid gland and the immune system ( Fabris et al . 1995 , Klein 2006 ). Thyroid hormones are involved in numerous physiological processes, such as
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Introduction During illness, thyroid hormone metabolism changes profoundly. Serum thyroid hormones decrease and the classical negative feedback loop of the hypothalamic–pituitary–thyroid axis is absent. This is known as the nonthyroidal
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Introduction Thyroid hormone receptor (TR) and liver X-receptors (LXRs) are the key regulators of lipid metabolism. Both these receptors prefer to bind to a direct repeat of the consensus DNA-binding site separated by a 4 bp spacing (DR-4), and thus