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Updated: Jun 16, 2026

In vitro Functional Characterization of Mouse Colorectal Afferent Endings
Published on: January 21, 2015
Cannabinoid 1 receptors modulate intestinal sensory and motor function in rat
1Department of Internal Medicine II, Ludwig Maximilians University, 81377 Munich, Germany. birol.yuece@med.uni-muenchen.de
The cannabinoid-1 (CB(1)) receptor modulates intestinal afferent nerve sensitivity to pain mediators and mechanical stimuli. CB(1) receptor activation influences visceral pain perception and intestinal motility by altering nerve signaling.
Area of Science:
- Gastroenterology
- Neuroscience
- Pharmacology
Background:
- Cannabinoid receptors play a role in visceral pain and intestinal motility.
- The precise mechanisms of cannabinoid receptor involvement in the gut are not fully understood.
Purpose of the Study:
- To investigate the role of the cannabinoid-1 (CB(1)) receptor in modulating intestinal afferent nerve activity.
- To determine the effect of CB(1) receptor activation on the intestinal peristaltic reflex.
Main Methods:
- In vitro studies using rat intestinal segments.
- Measurement of afferent nerve discharge from mesenteric nerves.
- Assessment of the myenteric peristaltic reflex using electrical field stimulation.
Main Results:
- CB(1) receptor antagonism reduced nerve discharge to bradykinin and distension.
- CB(1) receptor activation increased nerve sensitivity to 5-HT.
- CB(1) receptor activation enhanced ascending neuronal contractions, an effect blocked by antagonism.
Conclusions:
- CB(1) receptor activation differentially affects intestinal afferent nerve sensitivity to various stimuli.
- The CB(1) receptor plays a significant role in regulating intestinal nerve function and motility.
- Further research is required to elucidate the physiological implications of these findings.
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