
Psoriasis relapses involve skin-resident memory T cells, inherited from previous flares, with specific fatty acid requirements for residence and function. Gas chromatography/mass spectrometry revealed altered fatty acid compositions in resolved and nonlesional skin of biologic-treated patients. Higher oleic acid levels correlated with reduced IL-17 epidermal transcriptomic signatures in T-cell-activated skin explants. Understanding the link between skin lipid composition and epidermal T-cell functions suggests the potential for custom fatty acids to modulate skin-resident T cells, offering insights for managing inflammatory skin diseases.
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