Objective:

To identify transcriptionally reprogrammed non-immune resident cells, including fibroblasts and epithelial cells, that contribute to sustained inflammation in alopecia areata (AA), highlighting their potential as therapeutic targets.

Key Findings:

• A remodeled immune niche in AA lesions includes lymphoid-myeloid expansion and clonal cytotoxic CD8+ T1 cell accumulation, suggesting a shift in immune dynamics.
• Epithelial cells in AA exhibited upregulated MHC-II and immunomodulatory activity, indicating their role in sustaining inflammation.
• A novel pro-inflammatory fibroblast subset (FB3) enriched in AA expressed high levels of MIF and displayed inflammatory signatures, highlighting a new target for therapy.
• An intensified MIF-centered inflammatory circuit was identified, connecting FB3 and dendritic cell subsets, which may inform future treatment strategies.

Interpretation:

Fibroblasts, particularly the FB3 subset, actively participate in immune-inflammatory regulation in AA through elevated MIF secretion, suggesting a role beyond structural support.

Limitations:

• The study relies on publicly available datasets, which may have inherent biases or limitations in sample representation.

Conclusion:

Targeting FB3 differentiation or inhibiting MIF-related signaling pathways may represent a promising therapeutic avenue for AA, emphasizing the need for further research in this area.