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- W2107387908 abstract "Abstract: Topical photodynamic therapy (PDT) with methyl-aminolevulinate (MAL) is a well-established treatment for precancerous skin lesions and non-melanoma skin cancer. Treatment outcomes are less effective for thick than for superficial lesions, which are presumed to be due to insufficient PpIX biodistribution in tumour tissue. Hexyl-aminolevulinate (HAL) is a more lipophilic photosensitizer precursor than MAL and may penetrate the skin to a greater depth and more homogeneously. We compared HAL- and MAL-induced PpIX accumulation in specific skin compartments using concentrations of 2%, 6% and 20% HAL and MAL on long-term UV-irradiated mouse skin. Furthermore, 20% HAL and 20% MAL were applied to non-irradiated skin. Porphyrin fluorescence was measured by fluorescence microscopy in selected skin regions: the epidermis, superficial dermis, deep dermis and sebaceous gland epithelium down to a depth of 1 mm. We found higher PpIX fluorescence intensities in epidermis and sebaceous gland epithelium from 2%, 6% and 20% HAL (median 72–104 au) than in corresponding concentrations of MAL (median 35–69 au) (P < 0.01). Fluorescence intensities in the superficial (35 au) and deep dermis (32 au) were similar for HAL and MAL (P = 0.51) and lower than epidermal fluorescence intensities (P < 0.001). Significantly, higher median PpIX fluorescence intensities (64 au) were found in 20% MAL-incubated skin irradiated with UV than in non-irradiated skin (48 au) (P < 0.001). HAL-induced fluorescence intensities did not depend on UV exposure (HAL 20%, UV: 72 au, non-UV: 70 au) (P = 0.87). In conclusion, HAL express high affinity for epidermis and sebaceous gland epithelium, and MAL for actinically damaged skin, which raises future perspectives for improved selectivity in PDT." @default.
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- W2107387908 date "2012-02-10" @default.
- W2107387908 modified "2023-09-26" @default.
- W2107387908 title "Porphyrin biodistribution in UV-exposed murine skin after methyl- and hexyl-aminolevulinate incubation" @default.
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- W2107387908 doi "https://doi.org/10.1111/j.1600-0625.2012.01442.x" @default.
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