Neuropeptide Y
mammalian protein found in Homo sapiens
Neuropeptide Y (NPY) is a 36-amino acid neuropeptide that is involved in various physiological and homeostatic processes in both the central and peripheral nervous systems. It is secreted alongside other neurotransmitters such as GABA and glutamate.
In the autonomic system it is produced mainly by neurons of the sympathetic nervous system and serves as a strong vasoconstrictor and also causes growth of fat tissue. In the brain, it is produced in various locations including the hypothalamus, and is thought to have several functions, including: increasing food intake and storage of energy as fat, reducing anxiety and stress, reducing pain perception, affecting the circadian rhythm, reducing voluntary alcohol intake, lowering blood pressure, and controlling epileptic seizures.
Function
Neuropeptide Y has been identified as being synthesized in GABAergic neurons and to act as a neurotransmitter during cellular communication. Neuropeptide Y is expressed in interneurons. NPY exerts most of its effects through Neuropeptide Y receptors, mainly Y1, Y2, Y4, and Y6. All receptors have been indicated as participants in post-synaptic transmission activity, but the Y2 receptor has also been found to be involved in pre-synaptic processing.
The receptor protein that NPY operates on is a G protein-coupled receptor in the rhodopsin like 7-transmembrane GPCR family. Five subtypes of the NPY receptor have been identified in mammals, four of which are functional in humans.
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This entry incorporates text from “Neuropeptide Y” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.