“…HPT axis is responsible for the release of thyroid hormones [TH, thyroxine (T4) and 3,5,3’-triiodothyronine (T3)], important participants in energy homeostasis. TH act on multiple cell types and regulate development, growth and function of brain and other tissues through life-span, basal metabolic rate, non-facultative thermogenesis, muscular contraction, energy expenditure, heart rate stimulation, and the expression and activities of many proteins involved in lipid and carbohydrate metabolism ( 2 , 8 , 9 ). The activity of the axis is controlled by the release of thyrotropin-releasing hormone (TRH) from hypophysiotropic neurons localized in the hypothalamic paraventricular nucleus (PVN) that project their axons to the median eminence (ME) and release the processed TRH from their nerve terminals located close to portal vessels and to tanycytes ( Figure 1A ) ( 1 , 3 , 5 ).…”