Abstract
Somatostatin is a hypothalamic peptide hormone that inhibits the secretion of growth hormone, glucagon, insulin, gastrin and secretin, and also plays a role in neural transmission. Because of its wide range of possible clinical applications hundreds of somatostatin analogs have been synthesized and bioassayed to date. This review gives a historical perspective, summarizing approximately 30 years of research on somatostatin. The main focus is on the structure-activity relationships and conformational studies of the last generation of somatostatin agonists and their selectivity for five somatostatin receptor subtypes. Achievements in the synthesis of nonpeptide somatostatin analogs, as well as the first somatostatin antagonists, are also discussed. Finally, the use of a cyclic somatostatin scaffold to design ligands for other G-protein-coupled receptors, such as opioid and melanocortin receptors, is mentioned.
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