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Peptide YY (3-36) (human) Acetate
Peptide YY (PYY), a novel 36 amino-acid amidated hormone is a component of the complex neuroendocrine control process. This gut hormone (3-36), when infused into subjects, has been shown to reduce food intake in normal-weight and obese individuals. PYY (3-36) infusion also reduces the plasma levels of the hunger-promoting hormone ghrelin. PYY (3-36) levels have been shown to drop pre-meal and then increase post-prandially. In circulation, PYY (3-36) exists in at least two molecular forms: (1-36) and (3-36). PYY (3-36) selectively binds to Y2 receptors, and it has been found in human intestine and circulating blood.
The gut hormone peptide YY (PYY) belongs to the pancreatic polypeptide (PP) family along with PP and neuropeptide Y (NPY). These peptides mediate their effects through the NPY receptors of which there are several subtypes (Y1, Y2, Y4, and Y5). The L cells of the gastrointestinal tract are the major source of PYY, which exists in two endogenous forms: PYY(1-36) and PYY(3-36). The latter is produced by the action of the enzyme dipeptidyl peptidase-IV (DPP-IV). PYY(1-36) binds to and activates at least three Y receptor subtypes (Y1, Y2, and Y5), whereas PYY(3-36) is more selective for Y2 receptor (Y2R). The hypothalamic arcuate nucleus, a key brain area regulating appetite, has access to nutrients and hormones within the peripheral circulation.
Batterham, R. L., & Bloom, S. R. (2003). The gut hormone peptide YY regulates appetite. Annals of the New York Academy of Sciences, 994(1), 162-168.