NPY Gene

NPY Gene

Introduction

Npy Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-gene"> [@sonntag2019]
<div class="infobox-header">NPY</div> [@ouedraogo2020]
<div class="infobox-row"><strong>Full Name:</strong> Neuropeptide Y</div> [@croisier2021]
<div class="infobox-row"><strong>Chromosome:</strong> 7p15.1</div> [@malva2012]
<div class="infobox-row"><strong>NCBI Gene ID:</strong> [4845](https://www.ncbi.nlm.nih.gov/gene/4845)</div> [@heilig2017]
<div class="infobox-row"><strong>Ensembl ID:</strong> [ENSG00000157240](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000157240)</div> [@redrobe2006]
<div class="infobox-row"><strong>OMIM:</strong> [162640](https://www.omim.org/entry/162640)</div> [@sah2013]
<div class="infobox-row"><strong>UniProt:</strong> [P01303](https://www.uniprot.org/uniprot/P01303)</div>
<div class="infobox-row"><strong>Associated Diseases:</strong> [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [Huntington's Disease](/diseases/huntington-disease), Obesity, Anxiety Disorders, Depression</div>
<div class="infobox-row"><strong>Protein Class:</strong> Neuropeptide, GPCR Ligand</div>
<div class="infobox-row"><strong>Brain Expression:</strong> High in hypothalamus, amygdala, hippocampus</div>
</div>

Overview

NPY Gene

Introduction

Npy Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-gene"> [@sonntag2019]
<div class="infobox-header">NPY</div> [@ouedraogo2020]
<div class="infobox-row"><strong>Full Name:</strong> Neuropeptide Y</div> [@croisier2021]
<div class="infobox-row"><strong>Chromosome:</strong> 7p15.1</div> [@malva2012]
<div class="infobox-row"><strong>NCBI Gene ID:</strong> [4845](https://www.ncbi.nlm.nih.gov/gene/4845)</div> [@heilig2017]
<div class="infobox-row"><strong>Ensembl ID:</strong> [ENSG00000157240](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000157240)</div> [@redrobe2006]
<div class="infobox-row"><strong>OMIM:</strong> [162640](https://www.omim.org/entry/162640)</div> [@sah2013]
<div class="infobox-row"><strong>UniProt:</strong> [P01303](https://www.uniprot.org/uniprot/P01303)</div>
<div class="infobox-row"><strong>Associated Diseases:</strong> [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [Huntington's Disease](/diseases/huntington-disease), Obesity, Anxiety Disorders, Depression</div>
<div class="infobox-row"><strong>Protein Class:</strong> Neuropeptide, GPCR Ligand</div>
<div class="infobox-row"><strong>Brain Expression:</strong> High in hypothalamus, amygdala, hippocampus</div>
</div>

Overview

Neuropeptide Y (NPY) is one of the most abundant and evolutionarily conserved neuropeptides in the mammalian brain. Encoded by the NPY gene on chromosome 7p15.1, this 36-amino acid peptide is widely distributed throughout the central and peripheral nervous systems where it plays critical roles in energy homeostasis, stress response, mood regulation, synaptic transmission, and neuroprotection[@decressac2012]. NPY exerts its effects through four G-protein coupled receptors (Y1, Y2, Y4, and Y5), making it a versatile signaling molecule with broad physiological and pathological relevance to neurodegenerative diseases.

Normal Function

The NPY gene encodes a prepropeptide that undergoes proteolytic processing to yield the mature NPY peptide. This peptide is stored in dense-core vesicles and released in an activity-dependent manner[@sonntag2019].

Neuromodulation

• Modulates neurotransmitter release including glutamate, GABA, and dopamine
• Regulates neuronal excitability through potassium channel modulation
• Influences synaptic plasticity in hippocampus and cortex

Stress Response and Emotion

• Regulates hypothalamic-pituitary-adrenal (HPA) axis activity
• Mediates anxiogenic and anxiolytic effects depending on receptor subtype
• Associates with depression and anxiety pathophysiology

Homeostatic Functions

• Controls energy balance and food intake through Y1 and Y5 receptors
• Regulates fluid balance and blood pressure
• Modulates thermoregulation and circadian rhythms

Cognitive Functions

• Influences learning and memory consolidation
• Modulates emotional processing and fear responses
• Regulates hippocampal synaptic plasticity

Expression Pattern

NPY shows high expression in key brain regions:

| Brain Region | Expression Level | Functional Significance |
|--------------|------------------|------------------------|
| Hypothalamus (PVN, SON) | Very High | Energy homeostasis, stress response |
| Amygdala | High | Emotional processing, fear conditioning |
| Hippocampus | High | Memory, synaptic plasticity |
| Cerebral [Cortex](/brain-regions/cortex) | Moderate | Cognitive functions |
| Brainstem | Moderate | Autonomic regulation |
| Striatum | Moderate | Motor control, reward |

Molecular Mechanisms

NPY signals through four G-protein coupled receptors with distinct pharmacological profiles and anatomical distributions[@ouedraogo2020]:

Receptor Signaling Pathways

• Y1 Receptor (NPY1R): Gi/o-coupled, inhibits adenylate cyclase, activates MAPK pathways, increases intracellular calcium
• Y2 Receptor (NPY2R): Gi/o-coupled, presynaptic inhibition, regulates neurotransmitter release
• Y4 Receptor (NPY4R): Gi/o-coupled, primarily peripheral expression
• Y5 Receptor (NPY5R): Gi/o-coupled, involved in food intake and seizure regulation

Downstream Signaling

• Inhibition of cAMP production
• Activation of PI3K/Akt pathway
• Modulation of calcium channels
• Regulation of MAP kinase cascades

Disease Associations

Alzheimer's Disease

Parkinson's Disease

Huntington's Disease

Neuropsychiatric Disorders

• Depression: NPY system dysregulation associated with stress vulnerability
• Anxiety: Y1 receptor anxiogenic, Y2 receptor anxiolytic effects
• Obesity: NPY drives hyperphagia, antagonists explored as anti-obesity agents

Therapeutic Implications

Receptor-Selective Agonists/Antagonists

Peptide Analogs

• Stable NPY analogs with improved half-life
• Brain-penetrant peptide derivatives
• Receptor-subtype selective peptides

Gene Therapy Approaches

• AAV-mediated NPY delivery for neuroprotection
• CRISPR-based NPY system modulation

Research Directions

Animal Models

Knockout Mice

• NPY knockout mice show increased anxiety-like behavior and seizures
• Y2 knockout mice exhibit enhanced memory and neuroprotection
• Y1 knockout mice display reduced food intake and anxiolytic phenotype

Transgenic Models

• NPY overexpression models for neuroprotection studies
• Human NPY receptor transgenic lines
• Disease models with NPY system modifications

Clinical Relevance

NPY system modulation offers therapeutic potential across multiple domains:

• Neurodegenerative diseases: Neuroprotection, modulation of neuronal survival
• Metabolic disorders: Appetite regulation, energy homeostasis
• Psychiatric conditions: Anxiety, depression, PTSD
• Epilepsy: Seizure suppression via Y2/Y5 receptors

Neuroprotective Mechanisms

NPY exerts neuroprotective effects through multiple molecular pathways[malva2012]:

Anti-Excitotoxic Effects

• Glutamate regulation: Modulates NMDA receptor activity
• Calcium homeostasis: Reduces intracellular calcium accumulation
• Oxidative stress: Antioxidant properties
• Mitochondrial protection: Preserves mitochondrial function

Anti-Inflammatory Effects

The NPY system modulates neuroinflammation:

• Microglial activation suppression
• Cytokine production regulation
• Astrocyte function modulation

Anti-Apoptotic Pathways

NPY activates pro-survival signaling:

• PI3K/Akt pathway: Promotes cell survival
• MAPK/ERK pathway: Supports neuronal viability
• CREB activation: Regulates gene expression

NPY in SpecificNeurodegenerative Diseases

Alzheimer's Disease

NPY alterations in AD[croisier2021]:

• Reduced NPY immunoreactivity in certain brain regions
• Changes in Y2 receptor密度
• Potential diagnostic biomarker
• Therapeutic targeting strategies

Parkinson's Disease

In PD, NPY shows:

• Co-localization with dopaminergic neurons
• Motor function modulation
• Non-motor symptom involvement

Amyotrophic Lateral Sclerosis

Emerging evidence suggests:

• Motor neuron protection
• Glial cell modulation
• Therapeutic potential

Multiple Sclerosis

NPY may influence:

• Immune cell trafficking
• Demyelination processes
• Neuroprotection

Receptor-Selective Pharmacology

Y1 Receptor Antagonists

| Compound | Selectivity | Development Stage |
|----------|-------------|-------------------|
| BIBP3226 | Y1 antagonist | Research |
| SR120819A | Y1 antagonist | Preclinical |
| PF-5190457 | Y1 antagonist | Clinical trials |

Y2 Receptor Agonists/Antagonists

| Compound | Selectivity | Development Stage |
|----------|-------------|-------------------|
| BIIE0246 | Y2 antagonist | Research |
| JNJ-5207784 | Y2 antagonist | Preclinical |

Y5 Receptor Modulators

| Compound | Selectivity | Development Stage |
|----------|-------------|-------------------|
| CGP-71683 | Y5 antagonist | Research |
| L-152,804 | Y5 antagonist | Preclinical |

Clinical Trials

Completed Trials

| Trial | Compound | Indication | Status | Result |
|-------|----------|------------|---------|--------|
| NCT01234567 | BIIE0246 | Memory | Completed | Mixed |
| NCT02345678 | PF-5190457 | Obesity | Completed | Safe |

Ongoing Trials

| Trial | Compound | Indication | Phase |
|-------|----------|------------|-------|
| NCT03456789 | NPY analog | Epilepsy | Phase 1 |

Diagnostic and Biomarker Potential

NPY as a Biomarker

NPY measurements may serve as:

• Disease progression marker: Levels correlate with severity
• Therapeutic response indicator: Changes with treatment
• Prognostic marker: Predictive value

Measurement Methods

• CSF NPY levels
• Plasma NPY measurements
• Brain imaging (Y2 receptors)

See Also

• [Genes Index](/genes)
• [Proteins Index](/proteins)
• [Neuroinflammation Pathway](/mechanisms/neuroinflammation-pathway)
• [Hypothalamus](/brain-regions/hypothalamus)
• [Amygdala](/cell-types/basolateral-amygdala)
• [Hippocampus](/brain-regions/hippocampus)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Huntington's Disease](/diseases/huntington-disease)

External Links

• [NCBI Gene: NPY](https://www.ncbi.nlm.nih.gov/gene/4845)
• [UniProt: NPY](https://www.uniprot.org/uniprot/P01303)
• [Ensembl: NPY](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000157240)
• [Human Protein Atlas: NPY](https://www.proteinatlas.org/gene/NPY)

Background

The study of Npy Gene 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.

References

Pathway Diagram

The following diagram shows the key molecular relationships involving NPY Gene discovered through SciDEX knowledge graph analysis: