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Published on: March 17, 2015
A novel role for TRPM8 in visceral afferent function
Andrea M Harrington1, Patrick A Hughes, Christopher M Martin
1Nerve-Gut Research Laboratory, Department of Gastroenterology & Hepatology, Hanson Institute, Royal Adelaide Hospital, Adelaide, South Australia, Australia Discipline of Medicine, University of Adelaide, Adelaide, South Australia, Australia Discipline of Physiology, University of Adelaide, Adelaide, South Australia, Australia.
Transient receptor potential ion channel melastatin subtype 8 (TRPM8) is found in colonic sensory neurons. Activating TRPM8 inhibits pain signaling, suggesting a role in managing bowel hypersensitivity.
Area of Science:
- Neuroscience
- Gastroenterology
- Ion channel research
Background:
- Peppermint compounds may alleviate bowel hypersensitivity, but mechanisms are unknown.
- Transient receptor potential ion channel melastatin subtype 8 (TRPM8) is activated by cold and cooling agents.
- TRPM8's role in colonic sensory pathways requires elucidation.
Purpose of the Study:
- To investigate the function of TRPM8 in colonic sensory pathways.
- To determine TRPM8's effect on colonic afferent nerve fiber chemosensory and mechanosensory functions.
- To explore the interaction between TRPM8, TRPV1, and TRPA1 in the colon.
Main Methods:
- Laser capture microdissection, RT-PCR, and immunofluorescence to localize TRPM8.
- Retrograde tracing to identify colonic primary afferent neurons.
- In vitro extracellular single-fiber afferent recordings to assess TRPM8 activation effects.
Main Results:
- TRPM8 is localized to nerve fibers in the colon wall and DRG neurons.
- TRPM8 activation by icilin desensitized colonic afferents to mechanical stimulation.
- TRPM8 activation inhibited downstream chemosensory and mechanosensory actions of TRPV1 and TRPA1.
Conclusions:
- TRPM8 is present on a subpopulation of colonic high-threshold sensory neurons, potentially co-expressing TRPV1.
- TRPM8 activation inhibits colonic sensory neuron signaling.
- TRPM8 may represent a therapeutic target for managing visceral hypersensitivity.
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