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TRPC3 Antagonizes Pruritus in a Mouse Contact Dermatitis Model.
Katherine Beattie1, Haowu Jiang2, Mayank Gautam1
1Department of Neuroscience, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
The Journal of Investigative Dermatology
|September 27, 2021
Summary
TRPC3 channels in nerve cells help reduce scratching in contact dermatitis (CD) models. Loss of TRPC3 leads to more itch and reduced nerve fibers, suggesting TRPC3 protects against CD-induced itch.
Area of Science:
- Dermatology
- Neuroscience
- Immunology
Background:
- Contact dermatitis (CD) is a common skin condition causing rash and itch.
- TRPC3 channels are present in sensory neurons and immune cells.
Purpose of the Study:
- Investigate TRPC3 channel function in a mouse model of contact dermatitis.
- Determine the cell-specific role of TRPC3 in CD-induced itch.
Main Methods:
- Utilized TrpC3 null mice and conditional knockout mice (dorsal root ganglia and immune-specific).
- Assessed scratching behavior and hypersensitivity in CD and inflammatory pain models.
- Examined the number of MRGPRD+ NP1 afferents in dorsal root ganglia.
Main Results:
- TrpC3 null mice exhibited increased scratching in the CD model.
- TRPC3 deficiency did not affect acute somatosensation or inflammatory pain hypersensitivity.
- TRPC3 in dorsal root ganglia neurons, not immune cells, was crucial for reducing itch.
- TrpC3-mutant mice showed reduced MRGPRD+ NP1 afferents in affected dorsal root ganglia.
Conclusions:
- TRPC3 channels in primary afferent neurons play a protective role against CD-induced itch.
- Degeneration of NP1 fibers, potentially mediated by excitotoxicity, may contribute to increased itch in CD.
- TRPC3 and NP1 afferents are critical components in the pathology of contact dermatitis.
