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.
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Data availability
All data included in this study are available upon request by contact with the corresponding author.
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Acknowledgements
Thanks for the participating investigators, patients, as well as colleagues involved in the conduct of the study. Funding for this study was provided by Chinese National Natural Science Foundation (81301384).
Funding
This work was supported by the Chinese National Natural Science Foundation (81301384).
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PYJ, JWZ and YXL: designed and supervised the study. PYJ, YYL and JWZ: completed the majority of experiment and and wrote the first draft. ML, MT, YZ and ZXT: performed material preparation, data collection and analysis. YX and WTL: reviewed and edited the first draft of the manuscript. All authors reviewed the manuscript.
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All patients provided written informed consent, and the study was approved by the Ethics Committee of the First Affiliated Hospital of Nanjing Medical University (2020-SRFA-082). Mouse care and treatment protocols were approved by Nanjing Medical University Animal Care and Use Committee (Nanjing, Jiangsu, China).
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Jiang, P., Liu, Y., Zhang, J. et al. Mast cell stabilization: new mechanism underlying the therapeutic effect of intense pulsed light on rosacea. Inflamm. Res. 72, 75–88 (2023). https://doi.org/10.1007/s00011-022-01635-6
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DOI: https://doi.org/10.1007/s00011-022-01635-6