Rosacea Is Characterized by a Profoundly Diminished Skin Barrier

Medgyesi, Barbara and Dajnoki, Zsolt and Béke, Gabriella and Gáspár, Krisztián and Szabó, Imre Lőrinc and Janka, Eszter Anna and Póliska, Szilárd and Hendrik, Zoltán and Méhes, Gábor and Töröcsik, Dániel and Bíró, Tamás and Kapitány, Anikó and Szegedi, Andrea (2020) Rosacea Is Characterized by a Profoundly Diminished Skin Barrier. JOURNAL OF INVESTIGATIVE DERMATOLOGY. ISSN 0022-202X

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Abstract

Rosacea is a common chronic inflammation of sebaceous glanderich facial skin characterized by severe skin dryness, elevated pH, transepidermal water loss, and decreased hydration levels. Until now, there has been no thorough molecular analysis of permeability barrier alterations in the skin of patients with rosacea. Thus, we aimed to investigate the barrier alterations in papulopustular rosacea samples compared with healthy sebaceous glanderich skin, using RNA sequencing analysis (n ¼ 8). Pathway analyses by Cytoscape ClueGO revealed 15 significantly enriched pathways related to skin barrier formation. RT-PCR and immunohistochemistry were used to validate the pathway analyses. The results showed significant alterations in barrier components in papulopustular rosacea samples compared with sebaceous glanderich skin, including the cornified envelope and intercellular lipid lamellae formation, desmosome and tight junction organizations, barrier alarmins, and antimicrobial peptides. Moreover, the barrier damage in papulopustular rosacea was unexpectedly similar to atopic dermatitis; this similarity was confirmed by immunofluorescent staining. In summary, besides the well-known dysregulation of immunological, vascular, and neurological functions, we demonstrated prominent permeability barrier alterations in papulopustular rosacea at the molecular level, which highlight the importance of barrier repair therapies for rosacea.

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