Abstract
Propionibacterium acnes is often discussed as a contributing pathogenic factor in the aetiology of acne lesions. The aim of this study was to test which porphyrin patterns are synthesized by P. acnes in vivo in untreated acne patients and during standard acne regimens. These photosensitive compounds are potential targets for photo-dynamic therapy of acne and need to be better characterized in the skin. Using high-performance liquid chromatography coproporphyrin III was the main porphyrin identified in all patients. Coproporphyrin I and protoporphyrin were found at considerably lower concentrations. When the porphyrin concentration of individual patients receiving isotretinoin was analysed repeatedly over time, clinical improvement was associated with lowered levels of porphyrins. Statistical analysis demonstrated a significant reduction in the porphyrin fractions only in the isotretinoin group which was associated with clinical improvement 2 months after starting therapy.
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