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TRPA1 Channel Activation Inhibits Motor Activity in the Mouse Colon
Abdul-Azim Hassan1, Ben Sleet1, Zoe Cousins1
1Department of Pharmacy, Pharmacology and Postgraduate Medicine, University of Hertfordshire, Hatfield, United Kingdom.
Abstract:
There is a growing awareness of the role that TRP channels play in regulating sensory and motor functions in the gastrointestinal tract. In this study we used an in-vitro murine model of colonic peristaltic-like complexes (CPMCs) to evaluate the role of exogenous and endogenous TRPA1 signaling processes in regulating colonic motility. Using in-vitro recordings of intraluminal pressure to monitor the presence of CPMCs in colonic segments we performed a series of experiments on male CD1 mice (2 months of age) and found that CPMC activity was attenuated by TRPA1 agonists. Bath application of the TRPA1 antagonist HC-030031 had no effect upon basal CPMC activity whereas application of the synthetic TRPA1 agonist ASP7663 caused a reversible dose dependent decrease in CPMC frequency that was blocked by HC-030031. Cinnamaldehyde and 4-hydroxy-2-nonenal elicited long lasting decreases in CPMC frequency that were blocked by HC-030031 whereas the decreased CPMC activity invoked by AITC could not be blocked by HC-030031. Our results show that any potential mechanosensory function of TRPA1 doesn't involve contributing to distension induced colonic motor activity and that a role for TRPA1 in the colon is through regulating motility through exogenous and endogenous agonist induced inhibitory effects.
Insights
Transient Receptor Potential Ankyrin 1 (TRPA1) channels regulate colonic motility. TRPA1 agonists inhibit colonic peristaltic-like complexes, suggesting a role in motor control.
Area of Science:
- Gastroenterology
- Neuroscience
- Physiology
Background:
- Transient Receptor Potential (TRP) channels are increasingly recognized for their roles in gastrointestinal sensory and motor functions.
- TRP Ankyrin 1 (TRPA1) channels are implicated in various physiological processes, including sensory perception.
Purpose of the Study:
- To investigate the role of exogenous and endogenous TRPA1 signaling in regulating colonic motility.
- To evaluate the impact of TRPA1 agonists and antagonists on colonic peristaltic-like complexes (CPMCs) in an in vitro murine model.
Main Methods:
- Utilized an in vitro murine model of colonic segments from male CD1 mice.
- Monitored colonic peristaltic-like complexes (CPMCs) via in vitro recordings of intraluminal pressure.
- Administered TRPA1 agonists (ASP7663, cinnamaldehyde, 4-hydroxy-2-nonenal, AITC) and a TRPA1 antagonist (HC-030031).
Main Results:
- TRPA1 agonists attenuated CPMC activity in a dose-dependent manner.
- The synthetic TRPA1 agonist ASP7663 reversibly decreased CPMC frequency, an effect blocked by HC-030031.
- Cinnamaldehyde and 4-hydroxy-2-nonenal induced long-lasting decreases in CPMC frequency, also blocked by HC-030031.
- AITC-induced decreases in CPMC activity were not blocked by HC-030031.
Conclusions:
- TRPA1 activation inhibits colonic motility, primarily through exogenous and endogenous agonist-induced inhibitory effects.
- TRPA1 does not appear to contribute to distension-induced colonic motor activity, suggesting its mechanosensory function is not involved in this context.
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