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• W2142313808 abstract "Topical 5-aminolaevulinic acid photodynamic therapy (5-ALA-PDT) causes a clinical inflammatory response in human skin. While histamine mediates the immediate reaction, the mediators of the prolonged erythema are unknown.To look for involvement of the proinflammatory mediators prostaglandin (PG)E2 and nitric oxide (NO) in topical PDT-induced erythema in human skin.A series of studies was performed in healthy volunteers (n = 35). Following definition of the erythemal time course and dose response to 5-ALA-PDT, duplicate 5-ALA dose series were iontophoresed into the skin of each ventral forearm and exposed to 100 J cm(-2) broadband red light. Within subject, arms were randomized to control, or treatment with the cyclooxygenase and NO synthase inhibitors indometacin and Nω -nitro-l-arginine methyl ester (l-NAME), respectively, and the impact on 5-ALA-PDT-induced erythema was quantified. Additionally, release of PGE2 and NO was directly assessed by sampling dermal microdialysate at intervals following 5-ALA-PDT administration.A 5-ALA dose-related delayed erythema occurred by 3 h (r = 0·97, P < 0·01), with erythema persisting to 48 h post-PDT. Topical indometacin applied immediately post-PDT reduced the slope of erythemal response at 3 h and 24 h (P < 0·05). Intradermal injection of l-NAME into 5-ALA-PDT-treated sites reduced the slope of response at 24 h post-PDT (P < 0·001), while significantly inhibiting erythema from 3 h to 48 h post-PDT (P < 0·01). Analysis of dermal microdialysate showed release of NO and PGE2 following treatment.Topical 5-ALA-PDT upregulates PGE2 and NO in human skin, where they play a significant role in the clinical inflammatory response. The potential relevance of these mediators to PDT in human cutaneous pathology warrants study." @default.
• W2142313808 created "2016-06-24" @default.
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• W2142313808 date "2013-08-30" @default.
• W2142313808 modified "2023-10-16" @default.
• W2142313808 title "Prostaglandin E₂and nitric oxide mediate the acute inflammatory (erythemal) response to topical 5-aminolaevulinic acid photodynamic therapy in human skin" @default.
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• W2142313808 doi "https://doi.org/10.1111/bjd.12562" @default.
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