label: thyrotropin-releasing hormone activity
label_lc: thyrotropin-releasing hormone activity
description: "The action characteristic of thyrotropin-releasing hormone (TRH), a hormone released by the mammalian hypothalamus into the hypophyseal-portal circulation in response to neural and/or chemical stimuli. Upon receptor binding, TRH increases the secretion of thyroid-stimulating hormone by the anterior pituitary."