Neuroendocrine peptide which is a critical regulator of cellular and organ growth, development, migration, differentiation and survival and of epithelial calcium ion transport. Osteostatin is a potent inhibitor of osteoclastic bone resorption. There are several secretory forms, including osteostatin, arising from endoproteolytic cleavage of the initial translation product. Each of these secretory forms is believed to have one or more of its own receptors that mediates the normal paracrine, autocrine and endocrine actions (By similarity). Belongs to the parathyroid hormone family.