Biological or Clinical Significance:
Peptide YY (PYY) is a gut hormone structurally and functionally related to a family of peptides including neuropeptide Y and pancreatic polypeptide (PP). The peptides of this family mediate their effects through several G protein-coupled receptors. PYY is primarily released from endocrine cells of the distal digestive tract and plays an important role in regulating food intake and energy balance. PYY, which can be detected in blood, is a 36 amino acid peptide which exists in the 1-36 form and the truncated 3-36 form. The 3-36 form is generated by DPP-IV cleavage of two N-terminal amino acids. Both forms are bioactive and differ in their affinity for various receptor types. PYY increases after eating, peaking at about 60 min. following food intake. It also has been found to be linked to diabetes type 2 and insulin resistance.
Principle of Test Method:
The PYY assay is a solid-phase ELISA designed to measure human PYY in serum and plasma. It employs the quantitative sandwich enzyme immunoassay principle.