Neurotensin Receptor 2 Neurons
Introduction <table class="infobox infobox-cell">Gene Symbol </td>Chromosomal Location </td>Protein Name </td>UniProt ID </td>Protein Class </td>
Neurotensin Receptor 2 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 neurotensin receptor 2 (NTSR2), also known as the neurotensin receptor 2 or NTS2, represent an important population in the central nervous system that mediates the effects of the neuropeptide neurotensin. While less studied than the high-affinity NTS1 receptor, NTSR2 plays crucial roles in stress response, pain modulation, and maintainance of neuronal homeostasis. [@neurotensin2020]
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Neurotensin Receptor 2 Neurons
Introduction <table class="infobox infobox-cell">Gene Symbol </td>Chromosomal Location </td>Protein Name </td>UniProt ID </td>Protein Class </td>
Neurotensin Receptor 2 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 neurotensin receptor 2 (NTSR2), also known as the neurotensin receptor 2 or NTS2, represent an important population in the central nervous system that mediates the effects of the neuropeptide neurotensin. While less studied than the high-affinity NTS1 receptor, NTSR2 plays crucial roles in stress response, pain modulation, and maintainance of neuronal homeostasis. [@neurotensin2020]
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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 NTSR2 gene encodes a 416-amino acid GPCR that shares 64% sequence homology with NTS1. Unlike NTS1, NTSR2 has lower affinity for neurotensin and is primarily coupled to Gi/o proteins.
Structure NTSR2 possesses the canonical seven transmembrane domain structure:
N-terminal extracellular domain : Contains N-glycosylation sitesTransmembrane helices (7): Spanning the plasma membraneExtracellular loops (3): Involved in ligand bindingIntracellular loops (3): G protein coupling interfaceC-terminal tail : Contains serine/threonine residues for phosphorylationKey structural features:
Lacks the proline in TM7 that characterizes NTS1
Different ligand-binding pocket architecture
Constitutively active in some cell types
Distribution in the Brain NTSR2 has a distinct regional distribution:
Hippocampus : CA1-CA3 pyramidal cells, dentate gyrus granule cellsCerebral cortex : Layer 2/3 and layer 5 pyramidal neuronsHypothalamus : Supraoptic nucleus, paraventricular nucleusThalamus : Midline and intralaminar nucleiBrainstem : Periaqueductal gray, dorsal rapheCerebellum : Purkinje cells, deep cerebellar nucleiOlfactory bulb : Mitral and tufted cellsNormal Physiological Functions
Stress Response NTSR2 neurons mediate key aspects of stress reactivity:
HPA axis modulation : Influences corticotropin-releasing hormone (CRH) releaseStress coping : Behavioral responses to chronic stressAnxiety : Anxiolytic effects of neurotensin via NTSR2Neuroendocrine integration : Links limbic system to pituitary
Pain Modulation NTSR2 contributes to pain processing:
Analgesia : NTSR2 activation produces analgesic effectsPain transmission : Modulates nociceptive circuits in PAGThermal regulation : Body temperature responses to stressItch sensation : NTSR2 in pruriceptive signaling
Homeostatic Functions
Thermoregulation : Fever generation and body temperature controlFood intake : Modulation of feeding behaviorWater balance : OsmoregulationCardiovascular control : Blood pressure regulationCognitive Functions
Learning and memory : Hippocampal NTSR2 in memory consolidationSynaptic plasticity : LTPmechanisms/long-term-potentiation) and LTD modulationNeuroprotection : Trophic effects of neurotensinRole in Neurodegenerative Diseases
Alzheimer's Disease Involvement:
NTSR2 expression altered in AD hippocampus
Neurotensin levels reduced in AD brain
Potential neuroprotective role
Relationship to cholinergic dysfunction
Mechanisms:
Modulation of amyloid-beta toxicity
Influence on tau phosphorylation
Effects on neuroinflammation
Parkinson's Disease Involvement:
NTSR2 in basal ganglia circuits
Potential for motor symptom modulation
Relationship to non-motor symptoms
Stress and mood in PD
Major Depression Involvement:
NTSR2 expression changes in depression
Relationship to stress-diathesis model
Antidepressant effects of NTSR2 modulation
Neurotensin as biomarker
Evidence:
Reduced neurotensin in CSF of depressed patients
NTSR2 knockout mice show depressive-like behavior
SSRIs affect NTSR2 expression
Chronic Pain States Involvement:
NTSR2 in chronic pain pathophysiology
Potential analgesic drug target
Neuropathic pain models show NTSR2 changes
Relationship to opioid system
Schizophrenia Involvement:
NTSR2 in dopaminergic pathways
Relationship to positive symptoms
Antipsychotic effects of neurotensin
Genetic associations
Molecular Interactions
Signaling Pathways NTSR2 activates multiple intracellular cascades:
Gi/o protein signaling : Inhibition of adenylate cyclaseMAPK pathway : ERK1/2 activationPLC-β : Phospholipase C signalingPI3K/Akt : Cell survival pathways
Receptor Interactions
NTS1 : Potential cross-talk and heterodimerizationD2R : Dopamine D2 receptor interactions opioid receptors : Functional interactions in pain modulationTherapeutic Implications
Drug Development
NTSR2 agonists : Analgesic potential
Anxiolytic effects
NTSR2 antagonists : Antidepressant potential
Applications in stress disorders
Neurotensin analogs : Brain-penetrant compounds in development
Clinical Applications
Chronic pain : NTSR2 agonists as analgesicsDepression : NTSR2-targeting antidepressantsAnxiety disorders : Anxiolytic NTSR2 modulatorsNeurodegeneration : Neuroprotective strategiesBiomarkers
CSF neurotensin as psychiatric biomarker
NTSR2 expression in blood cells
Research Directions
Circuit-specific studies : Defining NTSR2 neuron populationsOptogenetics : Manipulating NTSR2 circuitsHuman genetics : NTSR2 variants in psychiatric diseaseDrug discovery : Selective NTSR2 ligands
Background The study of Neurotensin Receptor 2 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: P0DHF6 (NTSR2)](https://www.uniprot.org/uniprot/P0DHF6)
[NCBI Gene: NTSR2](https://www.ncbi.nlm.nih.gov/gene/23625)
[PubMed: NTSR2](https://pubmed.ncbi.nlm.nih.gov/?term=NTSR2)
[IUPHAR: Neurotensin receptors](https://www.guidetopharmacology.org/GRAC/ObjectDetailsForward?familyId=37&objectId=79)
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