Th2 cell-mediated ferroptosis as a driver of sebaceous gland dysfunction in atopic dermatitis.

Th2 cell–associated ferroptosis in sebaceous glands is linked to reduced SG number, atrophy, and impaired lipid metabolism in atopic dermatitis, with ferroptosis levels elevated in SG.

• Why it matters: Although AD features reduced sebum and skin dryness, the functional state of sebaceous glands during disease development is unclear, limiting targeted therapy.
• What they did: Using multiomics including spatial transcriptomics, single-cell/bulk RNA sequencing, metabolomics, and histology, the study tested MC903-treated mice and performed mechanistic assays showing IL-4 increases ferroptosis in SZ95 cells and reduces GPX4 via TRIM15-mediated K48-linked ubiquitination.
• The result: Topical ferrostatin-1 and IL-4 blockade (anti-IL-4 or dupilumab) ameliorated AD-like dermatitis in MC903-treated mice, restoring SG morphology/function, reducing Th2 infiltration, lowering TEWL, and attenuating SG ferroptosis.

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