Enteric Neurons in Gut-Brain Axis

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Introduction

Enteric Neurons in Gut-Brain Axis
**Category** Gut-Brain Communication
**Location** Gastrointestinal tract (myenteric and submucosal plexuses)
**Cell Type** Enteric neurons (sensory, motor, interneurons)
**Function** Gut motility, secretion, vasodilation, immune modulation
**Neurotransmitters** Acetylcholine, nitric oxide, VIP, 5-HT
Taxonomy ID
Cell Ontology (CL) [CL:0007011](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0007011)
Database ID
Cell Ontology [CL:0007011](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0007011)
Cell Ontology [CL:1001579](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_1001579)
Cell Ontology [CL:4042028](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_4042028)
Symptom Prevalence
Constipation 50-80%
Delayed gastric emptying 30-50%
Small intestinal bacterial overgrowth 25-30%

Enteric Neurons In Gut Brain Axis 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.

The enteric nervous system (ENS), often called the “second brain,” is a complex network of neurons embedded in the lining of the gastrointestinal tract. It controls gut motility, secretion, blood flow, and immune function independently of the central nervous system. The ENS communicates bidirectionally with the brain via the vagus nerve and spinal cord, forming the gut-brain axis, which has emerged as a critical pathway in neurodegenerative diseases, particularly Parkinson’s disease. 1Braak H. Staging of brain pathology related to sporadic Parkinson's disease. Neurobiol Aging. 20032003 · DOI 10.1016/s0197-4580(02Open reference

Overview

Multi-Taxonomy Classification

Taxonomy Database Cross-References

Morphology & Electrophysiology

  • Morphology: enteric neuron (source: Cell Ontology)

    • Morphology can be inferred from Cell Ontology classification

PanglaoDB Marker Cross-References

  • Unknown (PanglaoDB):

Taxonomy & Classification

PanglaoDB Marker Cross-References

  • Unknown (PanglaoDB):

Enteric Nervous System Structure

The ENS consists of two major ganglionated plexus:

Myenteric Plexus (Auerbach’s Plexus)

  • Located between the longitudinal and circular muscle layers

  • Primarily controls gastrointestinal motility

  • Contains sensory neurons, motor neurons, and interneurons

  • Coordinates peristalsis and segmentation

Submucosal Plexus (Meissner’s Plexus)

  • Located in the submucosa

  • Regulates secretion, blood flow, and mucosal immune function

  • Contains sensory neurons that detect luminal contents

  • Interfaces with the epithelial barrier

Enteric Neuron Types

Sensory Neurons

  • Intrinsic primary afferent neurons (IPANs): Detect stretch, chemical changes, and nutrient content

  • Extrinsic afferents: Transmit signals via vagal and spinal pathways to the CNS

Motor Neurons

  • Excitatory motor neurons: Release acetylcholine to stimulate contraction

  • Inhibitory motor neurons: Release nitric oxide and VIP to promote relaxation

Interneurons

  • Ascending interneurons: Propagate signals orally

  • Descending interneurons: Propagate signals anally

Role in Parkinson’s Disease

The gut-brain axis has become a focal point in Parkinson’s disease research, with evidence suggesting that alpha-synuclein pathology may originate in the enteric nervous system and propagate to the brain via the vagus nerve.

Alpha-Synuclein Propagation Hypothesis

  1. Initiation in ENS: Misfolded alpha-synuclein may first aggregate in enteric neurons

  2. Retrograde transport: Pathological proteins travel via the vagus nerve to the dorsal motor nucleus of the vagus

  3. Brainstem progression: Pathology spreads to the locus coeruleus and substantia nigra pars compacta

  4. Cortical spread: Eventually reaches cortical regions in advanced disease

Clinical Evidence

  • Constipation: One of the earliest prodromal symptoms of PD, often preceding motor symptoms by decades [1]

  • Lewy bodies: Alpha-synuclein inclusions found in enteric neurons of PD patients [2]

  • Gut permeability: Increased intestinal permeability observed in PD patients [3]

Gastrointestinal Dysfunction in PD

Gut Microbiome Interactions

The ENS serves as an interface between the gut microbiome and the nervous system:

  • Microbial metabolites: Short-chain fatty acids (SCFAs) modulate enteric neuron function

  • Immune activation: Bacterial components can trigger neuroinflammation via the ENS

  • Neurotransmitter production: Gut bacteria produce precursors for serotonin and dopamine

Therapeutic Implications

Probiotic Interventions

  • Certain probiotic strains may reduce gastrointestinal symptoms in PD

  • Modulation of gut microbiota could potentially slow alpha-synuclein aggregation

Targeting the Vagus Nerve

  • Vagotomy (surgical removal of the vagus nerve) associated with reduced PD risk in some studies [4]

  • Non-invasive vagus nerve stimulation being explored for PD treatment

See Also

Background

The study of Enteric Neurons In Gut Brain Axis 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

  1. Braak H. Staging of brain pathology related to sporadic Parkinson's disease. Neurobiol Aging. 2003 2003 · DOI 10.1016/s0197-4580(02

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