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Type 2 Inflammation Contributes to Skin Barrier Dysfunction in Atopic Dermatitis.

Lisa A Beck1, Michael J Cork2, Masayuki Amagai3,4

  • 1Department of Dermatology, University of Rochester Medical Center, Rochester, New York, USA.

JID Innovations : Skin Science From Molecules to Population Health
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PubMed
Summary

Atopic dermatitis (AD) involves skin barrier dysfunction driven by immune cells and cytokines. Therapies targeting type 2 inflammation show promise for improving AD skin barrier function.

Keywords:
AD, atopic dermatitisAMP, antimicrobial peptideCLDN, claudinFFA, free fatty acidILC2, type 2 innate lymphoid cellJaki, Jak inhibitorK, keratinKC, keratinocyteMMP, matrix metalloproteinaseNMF, natural moisturizing factorPAR, protease-activated receptorPDE-4, phosphodiesterase-4SC, stratum corneumSG, stratum granulosumTCI, topical calcineurin inhibitorTCS, topical corticosteroidTEWL, transepidermal water lossTJ, tight junctionTLR, toll-like receptorTNF-α, tumor necrosis factor alphaTYK, tyrosine kinaseTh, T helperZO, zona occludenshBD, human β-defensin

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Area of Science:

  • Dermatology
  • Immunology
  • Genetics

Background:

  • Skin barrier dysfunction is a key characteristic of atopic dermatitis (AD).
  • AD involves complex interactions between keratinocytes and immune cells, leading to inflammation.
  • Type 2 inflammation, mediated by cytokines like IL-4, IL-5, IL-13, and IL-31, is central to AD pathogenesis.

Purpose of the Study:

  • To elucidate the mechanisms underlying skin barrier dysfunction in AD.
  • To explore the role of type 2 inflammation in AD.
  • To investigate the potential of anti-type 2 inflammation therapies for AD.

Main Methods:

  • Analysis of host-environment interactions in AD.
  • Investigation of immune cell involvement (type 2 innate lymphoid cells, basophils, mast cells, T helper type 2 cells).
  • Assessment of cytokine production (IL-4, IL-5, IL-13, IL-31) and their impact on barrier gene expression.

Main Results:

  • Type 2 inflammation broadly affects genes crucial for skin barrier integrity, including structural, lipid, and junctional proteins.
  • AD is associated with enhanced skin colonization by *Staphylococcus aureus* due to barrier defects.
  • Immune cell-mediated type 2 inflammation significantly contributes to skin barrier impairment in AD.

Conclusions:

  • Systemic therapies targeting type 2 inflammation may effectively improve the dysfunctional skin barrier in atopic dermatitis.
  • Understanding the interplay between immune responses and barrier function is critical for AD management.
  • Targeting specific inflammatory pathways offers a promising therapeutic strategy for AD.