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Related Experiment Videos

Endocannabinoids and the gut.

L Pinto1, R Capasso, G Di Carlo

  • 1Department of Experimental Pharmacology, University of Naples Federico II, via D. Montesano 49, 80131 Naples, Italy.

Prostaglandins, Leukotrienes, and Essential Fatty Acids
|June 8, 2002
PubMed
Summary
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Endocannabinoids like anandamide play a role in regulating digestive tract motility through CB1 receptors. Blocking these receptors can increase intestinal movement, suggesting a natural braking mechanism.

Area of Science:

  • Gastroenterology
  • Neuroscience
  • Pharmacology

Background:

  • Endocannabinoids (anandamide, 2-arachidonylglycerol) and their metabolic pathways are present in the digestive tract.
  • Enteric nerves express CB1 receptors, which are implicated in regulating gastrointestinal functions.

Purpose of the Study:

  • To investigate the role of endocannabinoids in modulating intestinal motility.
  • To elucidate the involvement of CB1 receptors in the observed effects.

Main Methods:

  • Pharmacological administration of anandamide in isolated guinea-pig ileum and in vivo mouse models.
  • Utilizing a selective CB1 receptor antagonist (SR141716A) to assess its impact on intestinal motility.

Main Results:

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  • Anandamide administration inhibited excitatory transmission, peristalsis, and reduced intestinal motility, mediated by CB1 receptors.
  • The CB1 receptor antagonist SR141716A increased intestinal motility, likely via endocannabinoid displacement.
  • Potential roles for non-CB1 and vanilloid receptors in mediating anandamide's effects were suggested.

    • Conclusions:

    • Endocannabinoids, acting via CB1 receptors on enteric nerves, are key regulators of intestinal motility.
    • Pharmacological manipulation of the endocannabinoid system offers potential therapeutic targets for gastrointestinal motility disorders.