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Psoriasis (PsO) involves distinct skin inflammation features and immune cell changes. Severe PsO alters distant skin cell and metabolic composition, impacting overall health.

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Area of Science:

  • Immunology
  • Dermatology
  • Genomics

Background:

  • Human inflammatory skin diseases have complex cellular and molecular features.
  • The tissue context and systemic impact of these conditions are not fully understood.
  • Psoriasis (PsO) serves as a model for immune-mediated diseases with potential extracutaneous manifestations.

Purpose of the Study:

  • To profile human psoriasis using spatial transcriptomics.
  • To understand the differences in immune microenvironments between healthy and inflamed skin.
  • To investigate the systemic impact of psoriasis on tissue context and cellular composition.

Main Methods:

  • Spatial transcriptomics (ST) analyses of 25 healthy, active lesion, and uninvolved skin biopsies.
  • Integration with public single-cell transcriptomics data.
  • Tissue-scale cartography to identify core disease features.

Main Results:

  • Significant differences in immune cell niches between healthy and inflamed skin.
  • Identification of an inflamed suprabasal epidermal state and B lymphocytes in active lesions.
  • Stratification of lesional and nonlesional samples by disease severity, linked to metabolic dysfunction signatures in macrophages, fibroblasts, and lymphatics.

Conclusions:

  • Mild and severe psoriasis exhibit distinct molecular characteristics.
  • Severe psoriasis significantly alters the cellular and metabolic state of distal, unaffected skin.
  • The study provides a valuable spatial transcriptomics resource for skin research.