Cross Disease Single-Cell Meta-Analysis Deciphers Conserved Pan-Inflammatory Circuits and Divergent Endothelial...

Area of Science:

• Dermatology
• Immunology
• Vascular Biology

Background:

• Skin vascular endothelial cells (VECs) are vital for vascular function and immune responses.
• Their specific roles in inflammatory skin disorders are not fully understood.
• Understanding VEC heterogeneity is key to deciphering skin inflammation pathogenesis.

Purpose of the Study:

• To create a comprehensive atlas of VECs across multiple inflammatory skin diseases.
• To identify shared and distinct VEC features in psoriasis, atopic dermatitis, and lupus erythematosus.
• To elucidate the role of VECs in immune cell recruitment and vascular remodeling.

Main Methods:

• Single-cell RNA sequencing analysis of 94 skin samples.
• Inclusion of healthy controls and patients with psoriasis, atopic dermatitis, and lupus erythematosus.
• Development of a VEC atlas to map cellular states and interactions.

Main Results:

• Identified common and disease-specific VEC features in immune activation, angiogenesis, metabolism, and communication.
• Post-capillary VECs (cluster P) were the most activated, enriched in pro-inflammatory pathways.
• VECs utilize disease-specific and conserved mechanisms for immune cell recruitment and vascular-immune crosstalk.

Conclusions:

• VECs exhibit diverse characteristics across inflammatory skin conditions.
• Activated VECs, particularly cluster P, play a significant role in driving skin inflammation.
• This study provides novel insights into vascular biology's contribution to skin disease pathogenesis.