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Callewaert, Chris; Nakatsuji, Teruaki; Knight, Rob; Kosciolek, Tomasz; Vrbanac, Alison; Kotol, Paul; Ardeleanu, Marius; Hultsch, Thomas; Guttman-Yassky, Emma; Bissonnette, Robert; Silverberg, Jonathan I.; Krueger, James; Menter, Alan; Graham, Neil M.H.; Pirozzi, Gianluca; Hamilton, Jennifer D.; Gallo, Richard L.
Journal of investigative dermatology, 01/2020, Volume: 140, Issue: 1Journal Article
Dupilumab is a fully human antibody to interleukin-4 receptor α that improves the signs and symptoms of moderate to severe atopic dermatitis (AD). To determine the effects of dupilumab on Staphylococcus aureus colonization and microbial diversity on the skin, bacterial DNA was analyzed from swabs collected from lesional and nonlesional skin in a double-blind, placebo-controlled study of 54 patients with moderate to severe AD randomized (1:1) and treated with either dupilumab (200 mg weekly) or placebo for 16 weeks. Microbial diversity and relative abundance of Staphylococcus were assessed by DNA sequencing of 16S ribosomal RNA, and absolute S. aureus abundance was measured by quantitative PCR. Before treatment, lesional skin had lower microbial diversity and higher overall abundance of S. aureus than nonlesional skin. During dupilumab treatment, microbial diversity increased and the abundance of S. aureus decreased. Pronounced changes were seen in nonlesional and lesional skin. Decreased S. aureus abundance during dupilumab treatment correlated with clinical improvement of AD and biomarkers of type 2 immunity. We conclude that clinical improvement of AD that is mediated by interleukin-4 receptor α inhibition and the subsequent suppression of type 2 inflammation is correlated with increased microbial diversity and reduced abundance of S. aureus.
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