NPY-Y5 Receptor Neurons

NPY-Y5 Receptor Neurons

Introduction

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">NPY-Y5 Receptor Neurons</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000197](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000197)</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>NPY5R</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>4q31.3</td>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Neuropeptide Y receptor type 5</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P16471</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>G protein-coupled receptor (GPCR), Class A</td>
</tr>
</table>

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]

<!-- multi-taxonomy-enrichment -->

Multi-Taxonomy Classification

NPY-Y5 Receptor Neurons

Introduction

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">NPY-Y5 Receptor Neurons</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000197](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000197)</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>NPY5R</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>4q31.3</td>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Neuropeptide Y receptor type 5</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P16471</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>G protein-coupled receptor (GPCR), Class A</td>
</tr>
</table>

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]

<!-- multi-taxonomy-enrichment -->

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:

Distribution in the Brain

NPY5R is expressed in brain regions involved in energy balance and reproduction:

• Hypothalamus: Arcuate nucleus (ARC), paraventricular nucleus (PVN), lateral hypothalamus
• Cerebral cortex: Layer-specific expression in prefrontal and entorhinal cortex
• Hippocampus: CA1-CA3 regions, dentate gyrus
• Amygdala: Basolateral and central nuclei
• Thalamus: Paraventricular and midline nuclei
• Brainstem: Nucleus tractus solitarius (NTS), area postrema
• Septal nuclei: Lateral septum

Normal Physiological Functions

Feeding and Energy Homeostasis

NPY-Y5 neurons are central to energy balance regulation:

Reproductive Function

NPY-Y5 signaling influences reproductive physiology:

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 consolidation
• Anxiety: Anxiolytic effects of NPY via Y5
• Depression: NPY-Y5 in mood regulation

Role 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

• 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

Metabolic Disorders

Obesity:

• NPY5R as drug target for obesity
• Y5 antagonists reduce food intake
• Genetic variants in NPY5R and obesity risk
• Therapeutic potential of Y5 modulation

• NPY-Y5 in insulin resistance
• Dysregulated NPY in type 2 diabetes
• Therapeutic targeting

Molecular Interactions

Signaling Pathways

NPY5R activates multiple intracellular cascades:

Receptor Interactions

• NPY1R/NPY2R: Can form heterodimers
• Cross-talk: With leptin and melanocortin systems
• Internalization: Clathrin-dependent endocytosis

Therapeutic Implications

Drug Development

• MK-0557 (discontinued for obesity)
• NPY5R blockers in development

• Potential for cachexia treatment
• Reproductive applications

Clinical Applications

• Obesity treatment: Y5 antagonists
• Cachexia: Y5 agonists
• Reproductive disorders: NPY-Y5 modulators
• Neuroprotection: NPY analog development

Biomarkers

• NPY5R expression as metabolic marker
• CSF NPY levels in neurodegeneration

Research Directions

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)