Thyroid hormone concentrations only become sufficient to maintain a euthyroid state through appropriate stimulation by pituitary thyroid-stimulating hormone (TSH). In such a dynamic system under constant high pressure, guarding against overstimulation becomes vital. Therefore, several defensive mechanisms protect against accidental overstimulation, such as plasma protein binding, conversion of ...

Thyroid stimulating hormone (TSH) secreting pituitary adenomas are rare tumors manifested as hyperthyroidism with goiter in the presence of elevated TSH. We present a case with pituitary adenoma secreting both TSH and growth hormone (GH) with the prominent clinical findings of hyperthyroidism but without clinical findings of acromegaly. Pituitary magnetic resonance imaging revealed a macroadeno...

Increased thyroid hormone production is essential for hatching of the chick and for the increased metabolism necessary for posthatch endothermic life. However, little is known about the ontogeny and distribution of pituitary thyrotrophs during this period or whether pituitary thyroid-stimulating hormone (TSH) production is regulated by endogenous thyroid hormones during chick embryonic developm...

C.RF- Tshr(hyt/hyt) mice have a mutated thyroid-stimulating hormone receptor (TSHR), and, without thyroid hormone supplementation, these mice develop severe hypothyroidism. When hypothyroid Tshr(hyt/hyt) mice were exposed to cold (4 degrees C), rectal temperature rapidly dropped to 23.9 +/- 0.40 degrees C at 90 min, whereas the wild-type mice temperatures were 37.0 +/- 0.15 degrees C. When we c...

Across taxa, the seasonal transition between non-breeding and breeding states is controlled by localised thyroid hormone signalling in deep brain via reciprocal switching of deiodinase enzyme expression from type 3 (DIO3) to 2 (DIO2). This switch considered be mediated increasing thyroid-stimulating ? (TSH?) release pars tuberalis, which occurs response a change photoperiod. Although well chara...

Objective This study analyzed the effectiveness of the thyroid-stimulating hormone (TSH) as a predictor of insulin resistance (IR) and its association with the clinical and metabolic parameters of women with polycystic ovary syndrome (PCOS) without overt hypothyroidism. Study Design A cross-sectional study was performed. Women with PCOS and without overt hypothyroidism (n = 168) were included. ...

Only a few previous studies have demonstrated an association between resistance to thyroid hormone (RTH) and thyroid cancer. The current study presents the case of a 67-year-old female who was referred to the Third Xiangya Hospital of Central South University with an enlargement of the neck that had grown gradually over two years and subsequently, rapidly enlarged over the two months prior to a...

Three generations of a family with clinical and subclinical hypothyroidism caused by thyroid stimulating hormone (TSH) unresponsiveness are described. Findings were low to normal serum thyroxine, raised serum TSH, and low radioiodine uptake; goitre was notably absent. This family is the first evidence of an autosomal dominant mode of transmission of TSH unresponsiveness and may enable identific...

Autoimmune thyroid diseases (AITD) are characterized by the presence of thyroid-specifi c autoantibodies. These are direc ted against thyroid microsomes, for which the main target antigen is thyroid peroxidase (TPO), against thyroglobulin (TG), or against the thyroid stimulating hormone (TSH) receptor. AITD frequently occur in combination with other autoimmune diseases, such as myasthenia gravi...

Autoimmune thyroid diseases (AITD) are characterized by the presence of thyroid-specifi c autoantibodies. These are direc ted against thyroid microsomes, for which the main target antigen is thyroid peroxidase (TPO), against thyroglobulin (TG), or against the thyroid stimulating hormone (TSH) receptor. AITD frequently occur in combination with other autoimmune diseases, such as myasthenia gravi...