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The role of PAR2 in regulating MIF release in house dust mite-induced atopic dermatitis

Lingxuan Zhou1, Guohong Zhang1, Kai Zhang1

  • 1Department of Dermatology, Peking University First Hospital, Beijing Key Laboratory of Molecular Diagnosis on Dermatoses, National Clinical Research Center for Skin and Immune Disease, National Medical Products Administration (NMPA) Key Laboratory for Quality Control and Evaluation of Cosmetics, Beijing, China.

Frontiers in Immunology
|October 17, 2024
PubMed

Insights

House dust mites trigger atopic dermatitis (AD). The study shows Macrophage Migration Inhibitory Factor (MIF) plays a key role in AD by regulating its expression and secretion via PAR2 in skin cells.

Area of Science:

  • Immunology
  • Dermatology
  • Molecular Biology

Background:

  • Atopic dermatitis (AD) is a chronic skin condition often exacerbated by house dust mites (HDM).
  • The protease-activated receptor 2 (PAR2) is implicated in AD pathogenesis, potentially activated by HDM.
  • Macrophage Migration Inhibitory Factor (MIF) is a cytokine suggested to be involved in inflammatory skin diseases.

Purpose of the Study:

  • To investigate the role of MIF and PAR2 in a house dust mite-induced mouse model of atopic dermatitis.
  • To elucidate the mechanisms by which PAR2 influences MIF expression, trafficking, and secretion in skin keratinocytes.

Main Methods:

  • Establishment of a HDM-induced AD mouse model in wild-type (WT) and PAR2-deficient (Par2-/-) mice.
  • Single-cell RNA sequencing of lesional skin to analyze cellular communication.
  • In vitro stimulation of primary keratinocytes with HDM or a PAR2 agonist (SLIGRL).
  • Immunofluorescence staining for MIF, P115, and KIF13B.
  • Treatment of AD mice with a MIF antagonist (ISO-1) and assessment of gene expression (IL-4, IL-13, TSLP, Arg1).

Main Results:

  • HDM-induced AD mice lacking PAR2 (HDM-Par2-/-) exhibited less severe skin lesions and pathology compared to WT mice.
  • Keratinocytes from WT mice secreted more MIF upon stimulation with HDM or SLIGRL than those from Par2-/- mice.
  • PAR2 activation in WT keratinocytes increased MIF secretion and influenced MIF-related intracellular trafficking proteins (P115, KIF13B) and α-tubulin acetylation.
  • MIF antagonism (ISO-1) in HDM-WT mice ameliorated AD symptoms and reduced key inflammatory markers (IL-4, IL-13, TSLP, Arg1).

Conclusions:

  • Macrophage Migration Inhibitory Factor (MIF) is a critical cytokine significantly upregulated in experimental atopic dermatitis.
  • PAR2 signaling in keratinocytes plays a crucial role in regulating MIF expression, intracellular transport, and secretion, thereby influencing AD pathogenesis.
  • Targeting MIF represents a potential therapeutic strategy for managing house dust mite-induced atopic dermatitis.
Keywords:
MIF releasePAR2atopic dermatitishouse dust mitesingle-cell transcriptomics

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