Monoamines in the enteric nervous system

Area of Science:

• Neurogastroenterology
• Gastrointestinal Physiology
• Neuroimmunomodulation

Background:

• Monoamines are critical neurotransmitters and signaling molecules in the gastrointestinal tract.
• Their roles in gut motility, secretion, perfusion, and immune function are increasingly recognized.
• Specific monoamines discussed include noradrenaline, dopamine, serotonin, and histamine.

Purpose of the Study:

• To review and synthesize recent advances in understanding monoamine roles in gastrointestinal physiology and pathophysiology.
• To highlight the functions of specific catecholamines (noradrenaline, dopamine) and other key molecules (serotonin, histamine).
• To address ongoing debates regarding serotonin's origin and mode of action in the gut.

Main Methods:

• Review of recent scientific literature in neurogastroenterology.
• Synthesis of findings on monoamine neurotransmitters and signaling molecules.
• Analysis of their physiological and pathophysiological implications in the gastrointestinal tract.

Main Results:

• Noradrenaline, from sympathetic neurons, regulates gut motility, secretion, perfusion, and immunity.
• Dopamine is produced by enteric neurons and may act as a transmitter.
• Serotonin influences gut motility and development, with ongoing debate on its neuronal vs. non-neuronal origins.
• Histamine, of non-neuronal origin, impacts neuroimmunomodulation and gastric acid production.

Conclusions:

• Monoamines are integral to gastrointestinal neurobiology and function.
• Further research is needed to fully elucidate the complex roles and interactions of these molecules.
• Understanding monoamine pathways is essential for advancing neurogastroenterology and treating related disorders.