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Distinct Roles of IL-4, IL-13, and IL-22 in Human Skin Barrier Dysfunction and Atopic Dermatitis.

Paolo D'Avino1, Juno Kim1, Manru Li1

  • 1Swiss Institute of Allergy and Asthma Research (SIAF), University of Zurich, Davos, Switzerland.

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|September 23, 2025
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Summary

This study reveals how IL-4, IL-13, and IL-22 impact human skin barrier function and immune responses in atopic dermatitis (AD). These cytokines disrupt the skin barrier, with dupilumab effectively restoring some pathways.

Keywords:
atopic dermatitisdupilumab (anti‐IL4Rα antibody)electrical impedance spectroscopyex vivo human skininflammationinterleukin‐13interleukin‐22interleukin‐4skin barrier

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Area of Science:

  • Immunology
  • Dermatology
  • Molecular Biology

Background:

  • Atopic dermatitis (AD) is a chronic inflammatory skin condition marked by eczema and impaired skin barrier function.
  • Type-2 cytokines, including Interleukin-4 (IL-4), IL-13, and IL-22, play significant roles in AD pathogenesis.
  • Current research often uses reconstructed skin models, which may not accurately reflect in vivo human skin responses.

Purpose of the Study:

  • To investigate the distinct effects of IL-4, IL-13, and IL-22 on bio-stabilized human skin with intact barriers and immune cells.
  • To elucidate the complex interplay between these cytokines and their impact on skin barrier integrity and immune modulation in AD.

Main Methods:

  • Spatial transcriptomics was employed on AD lesions and non-lesional skin.
  • Ex vivo human skin barrier integrity was assessed using electrical impedance spectroscopy (EIS), RNA-sequencing, and untargeted proteomics.
  • Analyses included skin biopsies from patients with AD treated with dupilumab.

Main Results:

  • AD lesions exhibited reduced expression of crucial barrier genes like CLDN1, FLG, and FLG2.
  • IL-4, IL-13, and IL-22 were found to disrupt the skin barrier in ex vivo human skin models.
  • Proteomic analysis confirmed that IL-4, IL-13, and IL-22 decrease key skin barrier proteins, notably filaggrin and claudin-1.
  • Dupilumab treatment partially restored IL-4/IL-13-dysregulated genes but had minimal impact on IL-22-associated pathways.

Conclusions:

  • The study provides detailed insights into the distinct immune profiles induced by IL-4, IL-13, and IL-22 stimulation on human skin.
  • These cytokines exhibit complex interactions that disrupt skin barrier function and modulate innate immune responses in AD.
  • Findings highlight the differential effects of cytokines and treatment responses, informing future therapeutic strategies for AD.