NPY-Y5 Receptor Neurons
Introduction <table class="infobox infobox-cell">Gene Symbol </td>Chromosomal Location </td>Protein Name </td>UniProt ID </td>Protein Class </td>
Npy Y5 Receptor Neurons is an important cell type in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Overview Neurons expressing the neuropeptide Y receptor Y5 (NPY5R) represent a key population in the hypothalamic and limbic circuits that regulate feeding behavior, energy homeostasis, and reproductive function. The NPY-Y5 receptor is one of five Y receptors (Y1, Y2, Y4, Y5, Y6) that mediate the effects of neuropeptide Y (NPY), one of the most abundant neuropeptides in the mammalian brain. [@neuropeptide2020]
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Multi-Taxonomy Classification ...
NPY-Y5 Receptor Neurons
Introduction <table class="infobox infobox-cell">Gene Symbol </td>Chromosomal Location </td>Protein Name </td>UniProt ID </td>Protein Class </td>
Npy Y5 Receptor Neurons is an important cell type in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Overview Neurons expressing the neuropeptide Y receptor Y5 (NPY5R) represent a key population in the hypothalamic and limbic circuits that regulate feeding behavior, energy homeostasis, and reproductive function. The NPY-Y5 receptor is one of five Y receptors (Y1, Y2, Y4, Y5, Y6) that mediate the effects of neuropeptide Y (NPY), one of the most abundant neuropeptides in the mammalian brain. [@neuropeptide2020]
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Multi-Taxonomy Classification
Taxonomy Database Cross-References
External Database Links
[Cell Ontology (CL:0000197)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000197)
[OBO Foundry (CL:0000197)](http://purl.obolibrary.org/obo/CL_0000197)
[Allen Brain Cell Atlas](https://portal.brain-map.org/atlases-and-data/bkp/abc-atlas)
[CellxGene Census](https://cellxgene.cziscience.com/)
[Human Cell Atlas](https://www.humancellatlas.org/)
Gene and Protein The NPY5R gene encodes a 456-amino acid GPCR that couples primarily to Gi/o proteins, inhibiting adenylate cyclase and reducing cAMP levels upon activation.
Structure NPY5R contains the typical seven transmembrane domain structure of GPCRs:
N-terminal extracellular domain : Ligand bindingTransmembrane domains (7): Helical segments TM1-TM7Extracellular loops (3): ECL1-ECL3Intracellular loops (3): ICL1-ICL3C-terminal intracellular domain : G protein coupling and phosphorylation sites
Distribution in the Brain NPY5R is expressed in brain regions involved in energy balance and reproduction:
Hypothalamus : Arcuate nucleus (ARC), paraventricular nucleus (PVN), lateral hypothalamusCerebral cortex : Layer-specific expression in prefrontal and entorhinal cortexHippocampus : CA1-CA3 regions, dentate gyrusAmygdala : Basolateral and central nucleiThalamus : Paraventricular and midline nucleiBrainstem : Nucleus tractus solitarius (NTS), area postremaSeptal nuclei : Lateral septumNormal Physiological Functions
Feeding and Energy Homeostasis NPY-Y5 neurons are central to energy balance regulation:
Orexigenic signaling : NPY binding to Y5 stimulates food intakeEnergy expenditure : Modulates metabolic rate and thermogenesisFuel utilization : Influences carbohydrate versus fat metabolismMeal initiation : Y5 activation promotes meal onset
Reproductive Function NPY-Y5 signaling influences reproductive physiology:
GnRH secretion : Modulates hypothalamic-pituitary-gonadal axisFertility : Y5 signaling affects reproductive successPuberty : Regulates timing of pubertal development
Circadian Regulation
NPY-Y5 circuits integrate circadian signals
Food anticipatory activity mediated by Y5
Entrainment of feeding rhythms
Cognitive and Emotional Functions
Learning and memory : Hippocampal Y5 in memory consolidationAnxiety : Anxiolytic effects of NPY via Y5Depression : NPY-Y5 in mood regulationRole in Neurodegenerative Diseases
Alzheimer's Disease Involvement:
NPY levels altered in AD brain
Y5 receptor expression changes in hippocampus
NPY-Y5 system affects amyloid pathology
Relationship to appetite changes in AD
Mechanisms:
Neuroprotective effects of NPY via Y5
Anti-excitotoxic properties
Modulation of neuroinflammation
Parkinson's Disease Involvement:
NPY neurons affected in PD
Y5 signaling and motor function
Weight loss and metabolic changes in PD
Non-motor symptoms (sleep, mood)
Huntington's Disease Involvement:
Altered NPY-Y5 in HD
Metabolic dysfunction and weight loss
Mood and behavioral changes
Hypothalamic pathology in HD
Obesity:
NPY5R as drug target for obesity
Y5 antagonists reduce food intake
Genetic variants in NPY5R and obesity risk
Therapeutic potential of Y5 modulation
Metabolic Syndrome:
NPY-Y5 in insulin resistance
Dysregulated NPY in type 2 diabetes
Therapeutic targeting
Molecular Interactions
Signaling Pathways NPY5R activates multiple intracellular cascades:
Gi/o protein signaling : Inhibition of adenylate cyclaseMAPK pathway : ERK1/2 activationPI3K/Akt : Cell survival signalingPLC pathway : Calcium mobilization (in some cell types)
Receptor Interactions
NPY1R/NPY2R : Can form heterodimersCross-talk : With leptin and melanocortin systemsInternalization : Clathrin-dependent endocytosisTherapeutic Implications
Drug Development
Y5 antagonists : MK-0557 (discontinued for obesity)
NPY5R blockers in development
Y5 agonists : Potential for cachexia treatment
Reproductive applications
Dual Y5/Y2 antagonists : Cledilide and analogs
Clinical Applications
Obesity treatment : Y5 antagonistsCachexia : Y5 agonistsReproductive disorders : NPY-Y5 modulatorsNeuroprotection : NPY analog developmentBiomarkers
NPY5R expression as metabolic marker
CSF NPY levels in neurodegeneration
Research Directions
Circuit-specific manipulation : Optogenetic targeting of NPY-Y5 neuronsSingle-cell transcriptomics : Defining NPY-Y5 neuron subtypesHuman genetics : NPY5R variants in metabolic diseaseTherapeutic development : Brain-penetrant Y5 modulators
Background The study of Npy Y5 Receptor Neurons has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
External Links
[UniProt: P16471 (NPY5R)](https://www.uniprot.org/uniprot/P16471)
[NCBI Gene: NPY5R](https://www.ncbi.nlm.nih.gov/gene/4882)
[PubMed: NPY5R](https://pubmed.ncbi.nlm.nih.gov/?term=NPY5R)
[IUPHAR: NPY receptors](https://www.guidetopharmacology.org/GRAC/FamilyIntroduction?familyId=63)
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