PubMed RSS Feed - -Mast cell stabilization: new mechanism underlying the therapeutic effect of intense pulsed light on rosacea

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Inflamm Res. 2022 Nov 3. doi: 10.1007/s00011-022-01635-6. Online ahead of print.

ABSTRACT

BACKGROUND: Rosacea, a chronic inflammatory disorder of the facial skin, is effectively treated by intense pulsed light (IPL).

OBJECTIVE: To explore the potential molecular mechanism underlying the photobiomodulation effect of IPL for rosacea treatment.

METHODS: Skin samples from patients with rosacea were subjected to histological and immunohistological staining. Ten patients were followed up after IPL treatment using the VISIA^® skin analysis system, and the severity was assessed. In vivo, skin changes in mice with rosacea-like inflammation induced by intradermal injection of 320 μM LL-37 with or without IPL treatment were evaluated using L*a*b colorimetry as well as histological and immunological staining. In vitro, LL-37-stimulated mast cells (MCs) with or without IPL treatment were evaluated for protein expression of matrix metalloproteinase (MMP)-9, kallikrein-related peptidase 5 (KLK5), and cathelicidin using western blotting and qRT-PCR.

RESULTS: Profound infiltration of inflammatory cells and evident MC degranulation were found in rosacea skin lesions. The expression of rosacea-related biomarkers and inflammatory cytokines was higher in lesional areas than in non-lesional areas, as demonstrated via immunochemical staining. In all patients, rosacea severity reduced after IPL therapy. In vivo, IPL alleviated inflammation in mice with rosacea-like inflammation, as demonstrated by the significantly decreased MMP-9, KLK5, and cathelicidin expression and reduced percentage of degranulating MCs. In vitro, IPL decreased MMP-9, KLK5, and cathelicidin expression in P815 cells, reducing the release of inflammatory cytokines and inhibiting rosacea-like inflammatory reactions.

CONCLUSION: The photobiomodulation effect of IPL for rosacea treatment may inhibit MC degranulation and alleviate inflammatory reactions.

PMID:36329130 | DOI:10.1007/s00011-022-01635-6

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