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IL-31-dependent neurogenic inflammation restrains cutaneous type 2 immune response in allergic dermatitis
Marlys S Fassett1,2,3, Joao M Braz4, Carlos A Castellanos2,3
1Department of Dermatology, University of California, San Francisco, CA, USA.
Science Immunology
|October 13, 2023
Summary
Interleukin-31 (IL-31) limits skin inflammation by activating neuroimmune pathways. Disrupting IL-31 exacerbates allergic dermatitis, revealing its role in regulating immune responses.
Area of Science:
- Immunology
- Neuroscience
- Dermatology
Background:
- Interleukin-31 (IL-31) is linked to pruritic inflammatory skin diseases.
- Its role in cutaneous inflammation and neurosensory pathway interplay is unclear.
Purpose of the Study:
- To investigate the function of IL-31 and its receptor IL31RA in allergic dermatitis.
- To elucidate the neuroimmune mechanisms regulating skin inflammation.
Main Methods:
- Utilized a mouse model of house dust mite (HDM)-induced allergic dermatitis.
- Examined Il31-deficient and Il31ra-deficient mice.
- Analyzed immune cell populations, cytokine production, and scratching behavior.
Main Results:
- Il31 deficiency reduced scratching but increased type 2 inflammation (CD4+ T cells, IgE) in HDM dermatitis.
- Il31ra deficiency enriched inflammatory monocytes/macrophages in lesional skin.
- IL-31 activation of IL31RA+ receptors releases CGRP, inhibiting T cell proliferation and IL-13 production.
Conclusions:
- IL-31 acts as an immunoregulatory factor, limiting type 2 skin inflammation.
- A novel neuroimmune pathway involving IL-31, CGRP, and T cells constrains cutaneous allergic responses.
- Findings may explain dermatitis flares in patients treated with anti-IL31RA therapy.
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