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Related Experiment Video

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Interferon-γ downregulates tight junction function, which is rescued by interleukin-17A.

Yukiko Mizutani1, Nao Takagi1, Haruna Nagata1

  • 1Department of Cosmetic Health Science, Gifu Pharmaceutical University, Gifu, Japan.

Experimental Dermatology
|July 1, 2021
PubMed
Summary

Interferon-gamma (IFN-γ) impairs skin barrier function in atopic dermatitis (AD) by affecting tight junctions. Interleukin-17A (IL-17A) can restore this function, offering insights into personalized AD treatments.

Keywords:
Janus kinaseatopic dermatitisatypical protein kinase zetacytokineskeratinocytes

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Area of Science:

  • Immunodermatology
  • Molecular Biology
  • Skin Barrier Function

Background:

  • Atopic dermatitis (AD) involves complex immune responses beyond typical type 2, including Th1, Th17, and Th22 cytokines.
  • The precise mechanisms by which these cytokines influence AD pathology and skin barrier integrity, particularly tight junction (TJ) stability, remain incompletely understood.
  • Cytokine imbalances are hypothesized to impact stratum corneum barrier function and disease severity in AD.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of TJ protein expression in AD.
  • To investigate the effects of Th1 (IFN-γ) and Th17 (IL-17A) cytokines on TJ protein expression and function.
  • To explore potential therapeutic strategies targeting cytokine pathways for AD.

Main Methods:

  • In vitro studies using normal human epidermal keratinocytes exposed to IFN-γ and IL-17A.
  • In vivo validation using a human skin equivalent model to assess TJ function.
  • Analysis of signaling pathways, including IFN-γ receptor/JAK/STAT and atypical protein kinase C zeta.

Main Results:

  • IFN-γ significantly inhibited claudin-1 expression in a time- and dose-dependent manner via the IFN-γ receptor/JAK/STAT pathway.
  • IFN-γ impaired TJ function in the human skin equivalent model.
  • IL-17A co-stimulation restored IFN-γ-induced TJ dysfunction, mediated by atypical protein kinase C zeta, without restoring TJ protein expression.

Conclusions:

  • IFN-γ plays a critical role in compromising skin barrier integrity in AD through TJ disruption.
  • IL-17A demonstrates a potential therapeutic role in restoring TJ function, independent of TJ protein levels.
  • Findings support personalized AD treatment strategies involving anti-cytokine therapies and JAK inhibitors.