Single-cell sequencing shows cellular heterogeneity of cutaneous lesions in lupus erythematosus

Discoid lupus erythematosus (DLE) and systemic lupus erythematosus (SLE) are both types of lupus, yet the characteristics, and differences between them are not fully understood. Here we show single-cell RNA sequencing data of cutaneous lesions from DLE and SLE patients and skin tissues from healthy controls (HCs). We find significantly higher proportions of T cells, B cells and NK cells in DLE than in SLE. Expanded CCL20(+) keratinocyte, CXCL1(+) fibroblast, ISG(hi)CD4/CD8 T cell, ISG(hi) plasma cell, pDC, and NK subclusters are identified in DLE and SLE compared to HC. In addition, we observe higher cell communication scores between cell types such as fibroblasts and macrophage/dendritic cells in cutaneous lesions of DLE and SLE compared to HC. In summary, we clarify the heterogeneous characteristics in cutaneous lesions between DLE and SLE, and discover some specific cell subtypes and ligand-receptor pairs that indicate possible therapeutic targets of lupus erythematosus. Discoid lupus erythematosus (DLE) and systemic LE (SLE) can present as cutaneous lesions. Here the authors characterise an scRNA dataset of cutaneous lesions from these patients and compare these to healthy controls showing differential immune cell recruitment, cell type and gene expression.