Atopic Dermatitis Complicated by Recurrent Eczema Herpeticum Is Characterized by Multiple, Concurrent Epidermal...

Area of Science:

• Immunodermatology
• Molecular biology
• Genomics

Background:

• Atopic dermatitis (AD) patients can develop severe skin infections like eczema herpeticum (EH).
• The underlying skin and immune mechanisms of AD with EH (ADEH) are not fully understood.
• Identifying these mechanisms is crucial for understanding EH susceptibility in AD.

Purpose of the Study:

• To investigate the transcriptional differences in nonlesional skin of AD patients with and without a history of EH.
• To explore the role of skin barrier and immune gene expression in ADEH pathobiology.
• To analyze plasmacytoid dendritic cell responses to herpes simplex virus 1 in ADEH patients.

Main Methods:

• RNA sequencing of nonlesional skin (epidermis and dermis) from ADEH+, ADEH-, and healthy control groups.
• RNA sequencing of herpes simplex virus 1-infected plasmacytoid dendritic cells.
• Differential gene expression analysis and pathway enrichment analysis.

Main Results:

• ADEH+ patients showed widespread epidermal gene expression dysregulation, particularly in type 2 cytokine, interferon, and IL-36γ pathways.
• Epidermal differentiation complex genes related to skin barrier function were also dysregulated in ADEH+ skin.
• Plasmacytoid dendritic cell responses to herpes simplex virus 1 were not altered by ADEH status.

Conclusions:

• The risk of ADEH is linked to a distinct, complex epidermal inflammatory profile.
• Dysregulation of epidermal differentiation complex genes contributes to ADEH pathobiology.
• Findings provide a foundation for future research into EH development in AD.