Atopic dermatitis (AD) and food allergy (FA) often co-occur and may share immune and barrier dysfunction. Early barrier disruption promotes systemic allergen sensitization, contributing to atopic diseases. Concurrent FA can worsen AD symptoms and alter the skin barrier and microbiome. Using a multi-omics approach via tape strips, we compare molecular features of pediatric AD with and without comorbid FA. Tape strips from lesional (LS) and nonlesional (NL) skin of children with AD+FA (n=17), AD only (n=12), and controls (n=8) were analyzed by RNAseq and OLINK proteomics. Differentially expressed genes/DEGs and proteins/DEPs were defined by fold change>1.5 and FDR<0.05. All AD patients showed immune and barrier alterations vs HC in LS and NL skin, but FA further exacerbated inflammation in LS skin, with 1260 DEGs (638up/622down) & 236 DEPs (227up/9down) in AD+FA vs 600 DEGs (277up/323down) & 193 DEPs (190up/3down) in AD only. Th1 (CXCL10/MX1), Th2 (CCL13/24,IL10), and innate immunity markers (IL6) were more upregulated in AD+FA. Th17 skewing, while universal, was stronger in AD+FA (IL17A/ 17F,CXCL1). Upregulation of pruritus (IL31), histamine (HRH4/HDC), and eosinophil markers (RNASE2) was unique to AD+FA. Several inflammatory (CXCL1/6,IL6,S100A12), pruritic (OSM), and profibrotic (COL1A1) markers showed strong concordance between transcriptomic and proteomic data. FA defines a more inflammatory AD endotype, supporting the need for more intensive immune therapy in this group.
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