By Levi Clancy for Student Reader on
Polypeptides are short chains of amino acids; most hormones are peptides. They are secreted by the pituitary, parathyroid, heart, stomach, liver, and kidneys.
Peptide hormones are synthesized as precursor molecules and processed by the endoplasmic reticulum and Golgi where they are stored in secretory granules. When needed, the granules are dumped into the bloodstream.
Different hormones can often be made from the same precursor molecule by cleaving it with a different enzyme.
Vasopressin (antidiuretic hormone, ADH)
Melanocyte-stimulating hormones (MSH)
Corticotropin (adrenocorticotropin, ACTH)
Thyrotropin (thyroid-stimulating hormone,TSH)
Growth hormone (GH, or somatotropin)
Luteinizing hormone (LH)
Human chorionic gonadotropin (hCG)
Follicle-stimulating hormone (FSH)
Corticotropin-releasing factor (CRF or CRH)
Gonadotropin-releasing factor (GnRF or GnRH)
Prolactin-releasing factor (PRF
Prolactin-release inhibiting factor (PIF)
Growth hormone-releasing factor (GRF)
Thyrotropin-releasing factor (TRH or TRF)
Calcitonin gene-related peptide (CGRP)
Parathyroid hormone (PTH)
Vasoactive intestinal peptide (VIP)
Gastrin inhibitory peptide (GIP)