Effect of Topical Corticosteroid Treatment on microRNA Expression in Infants with Atopic Dermatitis

Area of Science:

• Molecular Biology
• Immunology
• Dermatology

Background:

• MicroRNAs (miRNAs) are crucial regulators implicated in various diseases.
• Pediatric atopic dermatitis (AD) involves complex biological pathways.
• The effect of topical corticosteroid (TCS) therapy on miRNA expression in pediatric AD remains uncharacterized.

Purpose of the Study:

• To investigate the impact of 6 weeks of TCS therapy on miRNA expression in infants with AD.
• To identify specific differentially expressed miRNAs in peripheral blood mononuclear cells (PBMCs) and plasma following TCS treatment.
• To understand the functional roles of these miRNAs in AD pathogenesis and treatment response.

Main Methods:

• Small RNA sequencing and real-time RT-qPCR were employed to analyze miRNA expression in PBMCs.
• HTG EdgeSeq technology was utilized for miRNA profiling in plasma.
• Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis was performed on predicted miRNA targets.

Main Results:

• Five miRNAs (miR-143-3p, miR-27a-5p, miR-126-3p, miR-451a, miR-223-3p) were significantly altered in PBMCs post-TCS treatment.
• Twelve miRNAs exhibited differential expression in plasma after 6 weeks of TCS therapy.
• The identified miRNAs are involved in critical cellular processes including immune response, inflammation, and skin barrier function.

Conclusions:

• TCS treatment induces a distinct miRNA expression signature in the peripheral blood of infants with AD.
• These miRNA alterations provide novel insights into the molecular mechanisms underlying TCS efficacy in pediatric AD.
• Further research into these miRNAs may lead to improved therapeutic strategies for childhood AD.