Single-cell transcriptomics reveals prominent expression of IL-14, IL-18, and IL-32 in psoriasis

Area of Science:

• Immunology
• Dermatology
• Genomics

Background:

• Psoriasis is a chronic inflammatory skin condition.
• Cytokines and chemokines play a role in its pathogenesis.

Purpose of the Study:

• To characterize immune and non-immune cell populations in psoriasis.
• To identify inflammatory mediators involved in the disease using single-cell transcriptomics.

Main Methods:

• Single-cell transcriptomic analysis of psoriasis skin lesions from eight patients.
• Validation through in situ hybridization, serum analysis, and in vitro cell culture.
• Comparison with healthy control skin and a murine psoriasis model.

Main Results:

• Identified immune-activated cell types including keratinocytes, T-helper cells, dendritic cells, macrophages, and fibroblasts.
• Found prominent expression of Interleukin-14 (TXLNA), IL-18, and IL-32 in specific cell types within psoriatic lesions.
• Observed significantly higher percentages of IL-14, IL-18, and IL-32 expressing cells in psoriatic skin compared to healthy skin.

Conclusions:

• Provided a detailed view of psoriasis immune cell phenotypes.
• Supported the involvement of IL-14, IL-18, and IL-32 in the pathogenesis of psoriasis.