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• W2034348711 abstract "In photodynamic therapy the endogenous photosensitizer protoporphyrin IX (PpIX) is synthesized following topical application of aminolaevulinic acid (ALA). However, different tissues have distinct PpIX-accumulating properties, due to differences in penetration of ALA through the stratum corneum and/or alterations in the haem cycle. Preferential PpIX accumulation has been reported in terminally differentiated cell cultures but ex vivo data are lacking.To study the intrinsic PpIX-accumulating capabilities of skin explants from lesional and nonlesional skin in psoriasis and actinic keratosis, with normal skin serving as a control, and to study PpIX accumulation in relation to differentiation status in normal skin.Skin explants from patients with psoriasis, actinic keratosis and normal skin were incubated with ALA and PpIX was measured spectrofluorometrically. PpIX was measured in basal (beta1-integrin-positive) and suprabasal (beta1-integrin-negative) keratinocytes in normal skin. In addition, PpIX accumulation was studied in cell cultures at different levels of confluence and after induction of terminal differentiation.No significant differences in PpIX content were found between the different tissues. However, increased PpIX was found in beta1-integrin-negative compared with beta1-integrin-positive cells. In addition, in subconfluent cell cultures less PpIX was found compared with confluent cell cultures. Induction of terminal differentiation in vitro, however, resulted in less PpIX, which was likely to be related to cell volume.As no significant differences in PpIX synthesis could be found between the different tissue types, these data emphasize the importance of the penetration route of ALA through the stratum corneum. Preferential PpIX accumulation observed in suprabasal epidermal keratinocytes and confluent cell cultures points towards a terminal differentiation-specific effect." @default.
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• W2034348711 date "2009-04-01" @default.
• W2034348711 modified "2023-10-02" @default.
• W2034348711 title "Induction of protoporphyrin IX by aminolaevulinic acid in actinic keratosis, psoriasis and normal skin: preferential porphyrin enrichment in differentiated cells" @default.
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• W2034348711 doi "https://doi.org/10.1111/j.1365-2133.2008.09012.x" @default.
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