NPY5R — Neuropeptide Y Receptor Y5

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NPY5R — Neuropeptide Y Receptor Y5

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NPY5R — Neuropeptide Y Receptor Y5

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">NPY5R — Neuropeptide Y Receptor Y5</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>NPY5R</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Neuropeptide Y Receptor Y5</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>4q31.21</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/4883" target="_blank">4883</a></td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>G protein-coupled receptor (GPCR)</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td>Q99731</td>
</tr>
<tr>
<td class="label">Tissue Expression</td>
<td>Brain, hypothalamus, cortex, hippocampus</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

NPY5R — Neuropeptide Y Receptor Y5

Overview

...

NPY5R — Neuropeptide Y Receptor Y5

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">NPY5R — Neuropeptide Y Receptor Y5</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>NPY5R</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Neuropeptide Y Receptor Y5</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>4q31.21</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/4883" target="_blank">4883</a></td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>G protein-coupled receptor (GPCR)</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td>Q99731</td>
</tr>
<tr>
<td class="label">Tissue Expression</td>
<td>Brain, hypothalamus, cortex, hippocampus</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

NPY5R — Neuropeptide Y Receptor Y5

Overview

NPY5R (Neuropeptide Y Receptor Y5) encodes a G protein-coupled receptor (GPCR) that binds neuropeptide Y (NPY), a highly conserved 36-amino acid peptide neurotransmitter widely distributed throughout the central and peripheral nervous systems. Located on chromosome 4q31.21, NPY5R plays critical roles in regulating energy homeostasis, feeding behavior, circadian rhythms, and stress responses. While primarily studied in the context of metabolic disorders and obesity, emerging evidence suggests this receptor may have important functions in neuroprotection and neurodegenerative disease processes.

The neuropeptide Y (NPY) system consists of multiple receptors (Y1, Y2, Y4, Y5, and others) that mediate diverse physiological effects through Gi/o protein-coupled signaling pathways. NPY5R represents one of the least characterized NPY receptors, yet its distribution in key brain regions involved in homeostatic regulation and its genetic associations with metabolic and neuropsychiatric conditions make it a subject of growing scientific interest.

Molecular Biology and Signal Transduction

Receptor Structure

NPY5R is a Class A GPCR consisting of seven transmembrane domains connected by three extracellular loops and three intracellular loops. Like other NPY receptors, NPY5R signals primarily through Gi/o proteins, leading to inhibition of adenylate cyclase and reduced cyclic AMP (cAMP) production. The receptor also couples to ion channels, including inward-rectifier potassium channels, which mediate hyperpolarizing effects on neurons [@pnas2000].

Structural studies have revealed that NPY5R exhibits distinct binding characteristics compared to other NPY receptor subtypes. The receptor shows preferential binding to NPY over peptide YY (PYY), and antagonist affinity profiles differ significantly from Y1 and Y2 receptors [@wiley2004]. These pharmacological differences have implications for drug development targeting this receptor specifically.

Signaling Pathways

The primary signaling cascades activated by NPY5R include:

Gi/o Protein Inhibition of Adenylate Cyclase: NPY5R activation reduces cAMP levels, modulating protein kinase A (PKA) activity and downstream transcriptional regulators.

MAPK Pathway Modulation: NPY5R can activate extracellular signal-regulated kinase (ERK) 1/2 and p38 MAPK pathways, which are involved in cell survival and plasticity.

Ion Channel Regulation: Receptor activation modulates inward-rectifier potassium channels, affecting neuronal excitability.

PLC Inhibition: Some evidence suggests NPY5R can inhibit phospholipase C (PLC) activity, reducing inositol trisphosphate (IP3) signaling.

Expression Pattern and Localization

Brain Distribution

NPY5R exhibits a distinctive expression pattern in the mammalian brain, with highest levels in regions associated with homeostatic regulation:

Hypothalamus: Particularly dense expression in the paraventricular nucleus (PVN) and arcuate nucleus, where NPY5R participates in feeding and energy balance regulation.
Thalamus: Moderate expression in thalamic nuclei involved in sensory and autonomic processing.
Cortex: Layer-specific expression in the cerebral cortex, particularly in pyramidal neurons.
Hippocampus: Presence in the dentate gyrus and CA regions, suggesting roles in memory and synaptic plasticity.
Amygdala: Expression in the central nucleus and basolateral complex, involved in emotional processing.

A comprehensive mapping study showed NPY5R mRNA in human brain tissue, with the receptor detectable in both neurons and glia [@molpharm2003].

Peripheral Expression

Beyond the central nervous system, NPY5R is expressed in peripheral tissues including:

Adrenal gland
Heart (see role in cardiac function)
Gastrointestinal tract
Vascular smooth muscle
Adipose tissue

Physiological Functions

Energy Homeostasis and Feeding Behavior

NPY5R plays a well-established role in the neural circuits controlling food intake and energy balance. NPY is one of the most potent orexigenic (appetite-stimulating) peptides in the brain. The arcuate nucleus of the hypothalamus, which contains NPY-producing neurons, projects to the paraventricular nucleus where NPY5R is densely expressed.

Studies using selective antagonists have demonstrated that NPY5R blockade reduces food intake, particularly in the setting of fasting or high-fat diet-induced obesity. The receptor appears to act synergistically with other NPY receptors, particularly Y1R, in controlling feeding behavior. MK-0557, a selective NPY5R antagonist, was evaluated in clinical trials for obesity treatment but showed limited efficacy as monotherapy.

Research in knockout mice has provided important insights. Animals lacking Npy5r show altered responses to NPY infusion, though the phenotype is less severe than Y1 receptor knockouts, suggesting compensatory mechanisms among NPY receptor subtypes [@nature2001].

Circadian Rhythm Regulation

NPY5R participates in the temporal organization of metabolic and behavioral processes. The receptor shows time-of-day dependent expression patterns in the suprachiasmatic nucleus (SCN), the master circadian clock. NPY signaling through Y5 receptors modulates the phase-shifting effects of light on circadian rhythms, suggesting a role in the neural pathways connecting feeding behavior to circadian timing.

Stress Response and Mood

The NPY system is intimately involved in stress responses and emotional regulation. NPY5R has been implicated in anxiety and depression-like behaviors in preclinical models. Interestingly, NPY5R signaling may have bidirectional effects depending on brain region and context—some studies show anxiogenic effects while others demonstrate anxiolytic properties.

A 2022 study found associations between NPY5R genetic variants and metabolic side effects of antipsychotic treatment in patients with schizophrenia spectrum disorders, highlighting the receptor's position at the intersection of metabolic and psychiatric function [@pmid35213955].

Cardiac Function

NPY5R is expressed in the heart and vasculature, where it influences cardiac contractility and blood pressure. Studies have shown that NPY5R activation can have direct cardiostimulatory effects, potentially through modulation of calcium handling. The receptor may play a role in hypertensive and heart failure states.

Role in Neurodegenerative Diseases

Alzheimer's Disease

While direct evidence linking NPY5R to Alzheimer's disease pathogenesis remains limited, several mechanistic considerations suggest potential relevance:

NPY as a Neuroprotective Factor: NPY has demonstrated neuroprotective properties in vitro and in vivo, including protection against excitotoxicity and beta-amyloid toxicity. These effects are mediated at least partially through Y5 receptor signaling.

Synaptic Plasticity: NPY5R is expressed in the hippocampus, a brain region critically affected in AD. The receptor modulates synaptic transmission and plasticity, processes integral to learning and memory that are compromised in AD.

Neuroinflammation: The NPY system has immunomodulatory properties. Given the established role of neuroinflammation in AD progression, NPY5R-mediated signaling may influence inflammatory processes.

Metabolic Interactions: AD and metabolic syndrome share common pathophysiological features. NPY5R's central role in metabolism may indirectly influence AD risk through effects on systemic metabolism and vascular health.

Further research is needed to definitively establish or exclude NPY5R as a contributor to AD pathogenesis.

Parkinson's Disease

Similarly, direct evidence for NPY5R involvement in Parkinson's disease is sparse, but several observations are noteworthy:

NPY in PD Models: Some studies have shown altered NPY expression in parkinsonian brains and in animal models of PD, potentially reflecting compensatory responses to dopaminergic degeneration.

Neuroprotection: NPY has demonstrated protective effects on dopaminergic neurons in vitro, and Y5 receptor signaling may contribute to these effects.

Non-Motor Symptoms: PD involves non-motor symptoms including metabolic disturbances, sleep disorders, and mood alterations—all processes where NPY5R plays regulatory roles.

The receptor remains a potential therapeutic target for PD, though this application awaits validation from basic and translational studies.

Other Neurological Conditions

Epilepsy: NPY is an endogenous anticonvulsant, and NPY5R signaling contributes to seizure suppression in some models. Receptor activation may reduce excitatory neurotransmission and modulate neuronal excitability.

Stroke and Ischemia: NPY5R has been implicated in cerebral ischemia responses. NPY release increases during ischemic events, and Y5 receptor signaling may mediate both protective and damaging effects depending on timing and context.

PET Imaging and Biomarker Potential

A notable recent development is the development of PET tracers for NPY5R imaging in the brain. This technological advance enables in vivo visualization of receptor distribution and quantification of target occupancy by therapeutic drugs. Such imaging may have applications in:

Diagnosing conditions involving NPY system dysfunction
Monitoring treatment response to NPY-targeted therapeutics
Understanding disease-related changes in NPY5R expression

The development of Y5 receptor PET ligands represents a significant tool for studying this receptor in living human brain [@natcomm2021].

Therapeutic Implications

Obesity and Metabolic Disorders

NPY5R antagonists have been extensively investigated as anti-obesity agents. While early clinical trials with MK-0557 showed limited monotherapy efficacy, combinations with other agents (such as sibutramine or orlistat) showed promise. Current approaches focus on:

Multi-target ligands hitting both Y1 and Y5 receptors
Brain-penetrant vs. peripheral-selective compounds
Seasonal modulation based on circadian expression patterns

Mood and Anxiety Disorders

The NPY system's well-established role in stress, anxiety, and depression makes NPY5R an attractive target. Preclinical data suggest that Y5 receptor modulation may have antidepressant-like effects, though the mechanisms remain incompletely understood.

Cardiovascular Disease

Given NPY5R expression in the heart and vasculature, receptor antagonists may have applications in hypertension and heart failure. However, the complex, sometimes contradictory effects of NPY5R signaling in different cardiovascular contexts require careful dissection.

Genetic Variation and Clinical Significance

Polymorphisms

Multiple single nucleotide polymorphisms (SNPs) have been identified in the NPY5R gene. As noted above, certain variants show associations with metabolic side effects of antipsychotic medications in patients with schizophrenia. Additional associations have been reported with:

Obesity and body mass index
Food intake and eating behavior
Response to dietary interventions

Pharmacogenomics

NPY5R genotype may influence response to NPY-targeted therapeutics, with implications for personalized medicine approaches in metabolic and neuropsychiatric conditions.

Animal Models

Knockout Mice

Npy5r-/- mice show subtle phenotypes compared to other NPY receptor knockouts:

Modestly reduced body weight in some studies
Altered feeding responses to NPY challenge
Changes in gut microbiome composition [@scirep2017]

Transgenic Models

Overexpression of NPY5R in specific brain regions has been used to dissect receptor function in vivo, showing region-specific effects on behavior and metabolism.

Mermaid Diagram: NPY5R Signaling Pathways

Mermaid diagram (expand to render)

NPY5R in Specific Brain Regions

Hypothalamus

The hypothalamus contains the highest density of NPY5R in the brain:

Arcuate Nucleus:

Co-expression with NPY/AgRP neurons
Regulation of food intake
Integration of metabolic signals

Paraventricular Nucleus:

NPY5R mediates anorexigenic effects
GABAergic modulation of PVN neurons
Stress-induced eating behavior

Lateral Hypothalamus:

Orexigenic signaling through NPY5R
Wakefulness and feeding interaction
Reward pathway involvement

Hippocampus

NPY5R plays important roles in hippocampal function:

CA1 Region:

Modulation of synaptic plasticity
Memory consolidation processes
Stress response regulation

CA3 Region:

Mossy fiber plasticity
Pattern separation functions

Dentate Gyrus:

Adult neurogenesis modulation
Granule cell excitability

Amygdala

The amygdala shows NPY5R expression relevant to emotional processing:

Fear and anxiety regulation
Stress-induced behaviors
Emotional memory consolidation

Cortex

Cortical NPY5R involvement includes:

Prefrontal cortical function
Decision-making processes
Executive function modulation

Therapeutic Implications

Drug Development

NPY5R is a target for several therapeutic applications:

Obesity and Metabolic Disorders:

NPY5R antagonists reduce food intake
Weight loss effects in preclinical models
Potential combination therapies

Mood Disorders:

NPY5R modulation affects anxiety and depression
Stress response regulation
Novel antidepressant approaches

Neurological Diseases:

Potential for neurodegenerative disease intervention
Neuroprotection mechanisms
Cognitive enhancement possibilities

Clinical Trials

Several NPY5R-targeted compounds have been investigated:

| Compound | Target | Status | Indication |
|----------|--------|--------|------------|
| NPY5R antagonist A | Y5 | Phase II | Obesity |
| NPY5R antagonist B | Y5 | Phase I | Metabolic syndrome |
| NPY analog | Y1/Y5 | Preclinical | Neuroprotection |

Challenges in Drug Development

Key challenges remain:

Blood-brain barrier penetration
Receptor subtype selectivity
Off-target effects
Long-term safety profiles

Biomarker Potential

as a Disease Biomarker

NPY5R has potential as a biomarker:

Peripheral Markers:

NPY5R expression in PBMCs
Correlation with disease state

Neuroimaging:

PET ligands for NPY5R visualization
Brain region-specific binding patterns

Genetic Markers:

NPY5R polymorphisms
Association with disease risk

Clinical Applications

Potential clinical uses include:

Disease diagnosis support
Treatment response monitoring
Prognostic indicators

Research Methods

Molecular Biology Techniques

Key research approaches include:

Radioligand binding assays: Receptor characterization
In situ hybridization: Regional expression mapping
Western blot: Protein level analysis

Behavioral Testing

Animal models use:

Food intake measurements
Metabolic cage studies
Behavioral paradigms for anxiety/depression

Clinical Research

Human studies include:

PET imaging with NPY5R ligands
Genetic association studies
Post-mortem brain analysis

Interactions with Other NPY Receptors

NPY1R

NPY5R interacts with NPY1R:

Complementary signaling pathways
Heterodimer formation possibility
Overlapping physiological functions

NPY2R

Relationship with NPY2R:

Opposing effects on some functions
Coordinated regulation of feeding

NPY4R

Cross-talk with NPY4R:

Peripheral vs central functions
Metabolic regulation integration

Future Directions

Unresolved Questions

Key questions remain:

Receptor dynamics: How does NPY5R trafficking change in disease?

Cell-type specificity: What defines NPY5R function in specific neurons?

Therapeutic targeting: Can selective modulators be developed?

Biomarker validation: Is NPY5R a reliable disease marker?

Emerging Research Areas

Active areas include:

Single-cell transcriptomics
Optogenetic manipulation
Novel small molecule development
Gene therapy approaches

[Neuropeptide Y System](/neuropeptide-y-system) — Overview of NPY and its receptors
[NPY1R](/genes/npy1r) — Related receptor with overlapping functions
[Hypothalamic Regulation of Metabolism](/brain-regions/hypothalamus)
[Alzheimer's Disease Mechanisms](/diseases/alzheimers-disease)
[Parkinson's Disease Mechanisms](/diseases/parkinsons-disease)
[Appetite and Energy Homeostasis](/mechanisms/appetite-regulation)

External Links

[NCBI Gene: NPY5R](https://www.ncbi.nlm.nih.gov/gene/4883)
[UniProt: Q99731](https://www.uniprot.org/uniprot/Q99731)
[GeneCards: NPY5R](https://www.genecards.org/cgi-bin/carddisp.pl?gene=NPY5R)
[Ensembl: ENSG00000121329](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000121329)
[OMIM: 604003](https://www.omim.org/entry/604003)

References

[Cabrele & Beck-Sickinger, Molecular characterization of NPY5R (2004)](https://pubmed.ncbi.nlm.nih.gov/15662712/)

[Blomqvist & Herzog, Y-receptor subtypes (2005)](https://pubmed.ncbi.nlm.nih.gov/15835479/)

[Kaga et al., NPY5R and potassium channels (2000)](https://pubmed.ncbi.nlm.nih.gov/10896662/)

[Roseberry et al., NPY-mediated feeding behavior (2001)](https://pubmed.ncbi.nlm.nih.gov/11567019/)

[Gerald et al., NPY5R expression in human brain (2003)](https://pubmed.ncbi.nlm.nih.gov/12782363/)

[Gumbs et al., NPY5R in PVN feeding circuits (2006)](https://pubmed.ncbi.nlm.nih.gov/16600512/)

[Chen et al., NPY5R in cardiomyopathy (2013)](https://pubmed.ncbi.nlm.nih.gov/23596343/)

[Wu et al., NPY in mood and anxiety (2011)](https://pubmed.ncbi.nlm.nih.gov/21521153/)

[Brothers & Wahlestedt, NPY therapeutic potential (2014)](https://pubmed.ncbi.nlm.nih.gov/25360237/)

[Abramova et al., NPY5R SNVs and metabolic disorders in schizophrenia (2022)](https://pubmed.ncbi.nlm.nih.gov/35213955/)

[Lee et al., NPY5R knockout and gut microbiome (2017)](https://pubmed.ncbi.nlm.nih.gov/29247282/)

[Zhang et al., NPY5R antagonist anti-obesity (2018)](https://pubmed.ncbi.nlm.nih.gov/29972087/)

[Sun et al., NPY Y1 and Y5 receptors as therapeutic targets (2020)](https://pubmed.ncbi.nlm.nih.gov/32508688/)

[Shi et al., NPY5R PET imaging (2021)](https://pubmed.ncbi.nlm.nih.gov/33824333/)

[Xu et al., Y5 receptor and depression (2022)](https://pubmed.ncbi.nlm.nih.gov/35732189/)

[Park et al., NPY5R metabolic syndrome therapy (2023)](https://pubmed.ncbi.nlm.nih.gov/37163618/)

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Related Entities

NPY5R

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kg_node_id	NPY5R
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-af03af51abc5
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-npy5r'}
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📊 Evidence Profile Foundational

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📗 Cite This Artifact

NPY5R — Neuropeptide Y Receptor Y5

NPY5R — Neuropeptide Y Receptor Y5

NPY5R — Neuropeptide Y Receptor Y5

Overview

NPY5R — Neuropeptide Y Receptor Y5

NPY5R — Neuropeptide Y Receptor Y5

Overview

Molecular Biology and Signal Transduction

Receptor Structure

Signaling Pathways

Expression Pattern and Localization

Brain Distribution

Peripheral Expression

Physiological Functions

Energy Homeostasis and Feeding Behavior

Circadian Rhythm Regulation

Stress Response and Mood

Cardiac Function

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Other Neurological Conditions

PET Imaging and Biomarker Potential

Therapeutic Implications

Obesity and Metabolic Disorders

Mood and Anxiety Disorders

Cardiovascular Disease

Genetic Variation and Clinical Significance

Polymorphisms

Pharmacogenomics

Animal Models

Knockout Mice

Transgenic Models

Mermaid Diagram: NPY5R Signaling Pathways

NPY5R in Specific Brain Regions

Hypothalamus

Hippocampus

Amygdala

Cortex

Therapeutic Implications

Drug Development

Clinical Trials

Challenges in Drug Development

Biomarker Potential

as a Disease Biomarker

Clinical Applications

Research Methods

Molecular Biology Techniques

Behavioral Testing

Clinical Research

Interactions with Other NPY Receptors

NPY1R

NPY2R

NPY4R

Future Directions

Unresolved Questions

Emerging Research Areas

Cross-Linking to Related Topics

See Also

External Links

References

💬 Discussion