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Area of Science:

  • Gastroenterology
  • Neuroscience
  • Physiology

Background:

  • Neurotransmitters, including catecholamines and serotonin, are vital for homeostasis.
  • Traditionally studied for their roles in the 'fight or flight' response, their significance in gastrointestinal (GI) physiology is increasingly recognized.
  • Norepinephrine (NE), epinephrine (E), dopamine (DA), and serotonin are key players in gut function.

Purpose of the Study:

  • To review the current understanding of neurotransmitter roles in normal GI physiology.
  • To explore the impact of neurotransmitter dysregulation in GI and central nervous system diseases.
  • To discuss novel therapeutic approaches involving exogenous manipulation of neurotransmitters.

Main Methods:

  • Literature review of current research on neurotransmitters in GI physiology and pathophysiology.
  • Analysis of studies investigating the effects of neurotransmitters on gut motility, blood flow, immunity, and the microbiome.
  • Examination of research on the therapeutic potential of modulating neurotransmitter levels.

Main Results:

  • Neurotransmitters regulate GI blood flow, motility, nutrient absorption, innate immunity, and the microbiome.
  • Dysregulated neurotransmitter levels are implicated in diseases like inflammatory bowel disease (IBD) and Parkinson's disease, leading to GI symptoms.
  • Exogenous manipulation of catecholamine concentrations shows promise in reducing disease symptomology and progression.

Conclusions:

  • Neurotransmitters play a multifaceted role in maintaining GI health.
  • Aberrant neurotransmitter signaling contributes to various GI and neurological disorders.
  • Targeting neurotransmitter pathways with exogenous hormones or psychotropic medications presents a promising avenue for therapeutic intervention.