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Topic Overview The thyroid gland uses iodine from food to make two thyroid hormones: triiodothyronine T3 and thyroxine T4. When the hypothalamus and pituitary are working normally, they sense when: Thyroid hormone levels are low, so they secrete more TRH and TSH, which stimulates the thyroid to make more hormones.
Thyroid hormone levels are too high, so they secrete less TRH and TSH, which reduces hormone production by the thyroid. Roller and Camper mapped the mouse homolog to chromosome 6. Gaspar et al. Stimulation of microdissected, organ-cultured hair follicles with TRH promoted hair shaft elongation, prolonged the hair cycle growth phase anagen , and antagonized its termination by TGFB2 It also increased proliferation and inhibited apoptosis of hair matrix keratinocytes. Using Cre-recombinase-enabled cell-specific neuron mapping techniques in mice, Krashes et al.
Chemogenetic stimulation of these afferent neurons in sated mice markedly activated agouti-related protein AGRP; neurons and induced intense feeding. Conversely, acute inhibition in mice with caloric deficiency-induced hunger decreased feeding. Krashes et al.
Gaspar, E. Thyrotropin-releasing hormone TRH : a new player in human hair-growth control. Krashes, M. An excitatory paraventricular nucleus to AgRP neuron circuit that drives hunger. Nature , Roller, M. Localization of the thyrotropin-releasing hormone gene, Trh, on mouse chromosome 6. Mammalian Genome 6: , Yamada, M. Assignment of the thyrotropin-releasing hormone gene TRH to human chromosome 3q If a person has too little thyrotropin-releasing hormone, they will develop thyroid underactivity hypothyroidism.
This is a rare condition, usually due to an injury or tumour which destroys this area of the hypothalamus. This situation is referred to as secondary or central hypothyroidism. About Contact Events News. Search Search. You and Your Hormones. Students Teachers Patients Browse. Human body. Home Hormones Thyrotropin-releasing hormone. Thyrotropin-releasing hormone Thyrotropin-releasing hormone is produced by the hypothalamus.
It plays an important role in the regulation of thyroid gland activity. Alternative names for thyrotropin-releasing hormone Thyrotrophin-releasing hormone; TRH What is thyrotropin-releasing hormone?
How is thyrotropin-releasing hormone controlled?
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