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Serotonin, a crucial neurotransmitter synthesized by enterochromaffin cells, plays a cardinal role in regulating gastrointestinal (GI) motility. With over 90% of the body's total serotonin in the GI tract, its influence on digestive processes is profound. Serotonin is swiftly released upon various stimuli, such as food boluses or certain drugs, triggering intrinsic sensory neurons in the myenteric plexus and extrinsic vagal and spinal sensory neurons. This leads to the activation of the...
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Janet Best1, William Duncan2, Farrah Sadre-Marandi3

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This study introduces new computational models for serotonin metabolism, accounting for individual variations. These models help understand serotonin

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Area of Science:

  • Neuroscience
  • Computational Biology
  • Pharmacology

Background:

  • Serotonin, a key neurotransmitter, influences diverse behaviors and is targeted by medications like SSRIs.
  • Understanding serotonin dynamics is crucial for treating neurological and psychiatric disorders.
  • Existing models do not fully capture the variability in serotonin system components.

Purpose of the Study:

  • To develop novel deterministic and systems population models of serotonin metabolism.
  • To incorporate biological variability, including enzyme/transporter expression and autoreceptor function.
  • To provide tools for investigating serotonin dynamics and clinical questions.

Main Methods:

  • Developed a deterministic model for serotonin metabolism.
  • Created a systems population model accounting for parameter variations.
  • Utilized models to interpret experimental data from mouse hippocampus and substantia nigra.

Main Results:

  • Modeled steady-state serotonin levels and the impact of tryptophan and meals.
  • Identified potential dual serotonin reuptake mechanisms and long-lasting autoreceptor effects.
  • Quantified parameter variations needed to explain population-level response variability.

Conclusions:

  • New models effectively simulate serotonin dynamics and individual variations.
  • Models can explore effects of diet, autoreceptor function, and histamine.
  • Freely available codes facilitate further research into the serotonergic system and drug efficacy.