Single-cell transcriptomic profiling identifies therapeutic subpopulations of adipose-derived mesenchymal stromal...

Keloids are pathological scars characterized by excessive collagen deposition that occurs during wound healing after skin injury. Keloid fibroblasts (KF) and keloid keratinocytes (KK) are key contributors to keloid pathogenesis. Although adipose-derived mesenchymal stromal cells (ASCs) have been investigated for keloid therapy, their therapeutic potential and underlying mechanisms require further elucidation. This study aimed to characterize the therapeutic potential of ASCs for human keloid management.

Molecular profiles associated with keloid pathogenesis were characterized through integrative analyses, including gene expression profiling, functional annotation, protein-protein interaction mapping, and hub gene identification. Single-cell RNA sequencing (scRNA-seq) was used to identify ASC subpopulations with inhibitory effects on keloid development. The therapeutic efficacy of these subpopulations was subsequently assessed in a miniature pig model of hypertrophic scar.

Upregulation of hub genes such as NOG and IL6 was strongly associated with KF formation, whereas increased expression of APP and NOTCH1 was implicated in KK development. Functional scRNA-seq analysis identified ASC subpopulations capable of inhibiting the development of KF, KK, or both through molecular interactions with these hub genes. Administration of porcine ASCs enriched in the identified inhibitory subpopulations effectively prevented hypertrophic scar formation in the miniature pig model.

This study delineated key molecular signatures underlying keloid formation and identified ASC subpopulations with targeted inhibitory activity against pathological cell types involved in keloid development. These findings support the potential application of ASC-based interventions for prophylaxis and treatment of hypertrophic scarring in humans.