Fluorescence induction of protoporphyrin IX by a new 5-aminolevulinic acid nanoemulsion used for photodynamic therapy in a full-thickness ex vivo skin model.
An ex vivo porcine skin model was utilized to analyse the penetration of 5-aminolevulinic acid (5-ALA) contained in a nanoemulsion-based formulation BF-200 ALA (10% 5-ALA-hydrochloride) versus 16% aminolevulinate methyl ester-hydrochloride in a commercially cream (MAL cream) by fluorescence microscopy of their common metabolite protoporphyrin IX (PpIX) after 3, 5, 8 and 12 h. Fluorescence signals of PpIX in pig skin treated with BF-200 ALA were stronger than those for MAL cream. At 8 and 12 h, the PpIX fluorescence signals were 4.8- and 5.0-fold higher than those measured after MAL cream application. Fluorescence signals of PpIX after application of BF-200 ALA were detected in deeper tissue layers of the epidermis than after application of MAL cream (97.2 +/- 5.7 microm for BF-200 ALA vs 42.0 +/- 4.2 microm for MAL cream). These data implicate that BF-200 ALA in photodynamic therapy might lead to a superior therapeutically effect of intraepidermal (in situ) squamous cell carcinomas.
Tim
T
Maisch
Francesco
F
Santarelli
Stephan
S
Schreml
Philipp
P
Babilas
Rolf-Markus
RM
Szeimies
D000287:Administration, Topical; D000622:Aminolevulinic Acid / Q000008:administration & dosage / Q000378:metabolism / Q000494:pharmacology*; D000818:Animals; D004655:Emulsions; D005453:Fluorescence; D023421:Models, Animal; D010778:Photochemotherapy; D011524:Protoporphyrins / Q000378:metabolism*; D012867:Skin / Q000378:metabolism*; D012869:Skin Absorption / Q000187:drug effects; D013552:Swine
D004655:Emulsions; D011524:Protoporphyrins; D000622:Aminolevulinic Acid; C028025:protoporphyrin IX