Single-cell transcriptome analysis identifies skin-specific T-cell responses in systemic sclerosis

Area of Science:

• Immunology
• Dermatology
• Genomics

Background:

• T cells are implicated in systemic sclerosis (SSc) pathogenesis.
• Comprehensive studies on T-cell responses in SSc skin are limited.
• Understanding T-cell heterogeneity is crucial for SSc research.

Purpose of the Study:

• To investigate T-cell-mediated immune responses in progressive SSc skin.
• To analyze patient-specific T-cell heterogeneity using single-cell transcriptomics.
• To identify novel gene expression related to SSc severity.

Main Methods:

• Droplet-based single-cell RNA sequencing of 3729 CD3+ lymphocytes from SSc and healthy skin biopsies.
• Analysis of samples from 27 SSc patients and 10 healthy donors.
• Validation using confocal immunofluorescence microscopy.

Main Results:

• Identified distinct recirculating and tissue-resident T cell subsets in healthy and SSc skin.
• Discovered a unique cluster of CXCL13+ T cells in SSc skin with a T helper follicular-like signature.
• Observed that these T cells may promote B-cell responses in inflamed SSc skin.

Conclusions:

• Current SSc therapies cause broad immune cell toxicity.
• Targeting specific immune mechanisms in SSc can lead to more effective and less toxic treatments.
• This study provides a basis for developing novel, targeted SSc therapies.