![]() ![]() The secretion of prolactin by the anterior pituitary is tonically inhibited by dopamine from the tuberoinfundibular pathway of the hypothalamus and stimulated by thyrotropin-releasing hormone (TRH), estrogen, dopamine antagonist (antipsychotics), and multiple factors including suckling, stress, and sleep.įollicle-stimulating Hormone (FSH) and Luteinizing Hormone (LH)įSH and LH, also known as gonadotropins, are glycoprotein hormones secreted by the gonadotropin cells of the adenohypophysis. They are both glycoproteins made up of an alpha and beta subunit. Prolactin is a protein hormone secreted by the acidophilic lactotroph cells of the anterior pituitary gland. Chemically, prolactin is similar to a growth hormone composing of 199 amino acids, and forms after a 28-amino acid signal peptide are proteolytically cleaved from the prolactin prohormone (pre-prolactin). Its levels in the body are under tight regulation by the hypothalamus mediators, growth hormone-releasing hormone (GHRH), and growth hormone-inhibiting hormone (GHIH or somatostatin). Human growth hormone (HGH), also known as somatotropin, is a protein of 191 amino acid single chain polypeptides secreted by the acidophilic somatotropic cells of the anterior pituitary gland. The hormones of the pituitary gland are protein or polypeptide in nature and vary in complexity.
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