Titre
Hexyl-aminolevulinate-mediated photodynamic therapy: how to spare normal urothelium. An in vitro approach
Type
article
Institution
UNIL/CHUV/Unisanté + institutions partenaires
Périodique
Auteur(s)
Vaucher, L.
Auteure/Auteur
Jichlinski, P.
Auteure/Auteur
Lange, N.
Auteure/Auteur
Ritter-Schenk, C.
Auteure/Auteur
van den Bergh, H.
Auteure/Auteur
Kucera, P.
Auteure/Auteur
Liens vers les personnes
Liens vers les unités
ISSN
0196-8092
Statut éditorial
Publié
Date de publication
2007-01
Volume
39
Numéro
1
Première page
67
Dernière page/numéro d’article
75
Notes
In Vitro
Journal Article
Research Support, Non-U.S. Gov't --- Old month value: Jan
Journal Article
Research Support, Non-U.S. Gov't --- Old month value: Jan
Résumé
BACKGROUND AND OBJECTIVES: Photodynamic therapy (PDT) of superficial bladder cancer may cause damages to the normal surrounding bladder wall. Prevention of these is important for bladder healing. We studied the influence of photosensitizer concentration, irradiation parameters, and production of reactive oxygen species (ROS) on the photodynamically induced damage in the porcine urothelium invitro. The aim was to determine the threshold conditions for the cell survival. METHODS: Living porcine bladder mucosae were incubated with solution of hexylester of 5-aminolevulinic acid (HAL). The mucosae were irradiated with increasing doses and cell alterations were evaluated by scanning electron microscopy and by Sytox green fluorescence. The urothelial survival score was correlated with Protoporphyrin IX (PpIX) photobleaching and intracellular fluorescence of Rhodamine 123 reflecting the ROS production. RESULTS: The mortality ratio was dependent on PpIX concentration. After 3 hours of incubation, the threshold radiant exposures for blue light were 0.15 and 0.75 J/cm(2) (irradiance 30 and 75 mW/cm(2), respectively) and for white light 0.55 J/cm(2) (irradiance 30 mW/cm(2)). Photobleaching rate increased with decreasing irradiance. Interestingly, the DHR123/R123 reporter system correlated well with the threshold exposures under all conditions used. CONCLUSIONS: We have determined radiant exposures sparing half of normal urothelial cells. We propose that the use of low irradiance combined with systems reporting the ROS production in the irradiated tissue could improve the in vivo dosimetry and optimize the PDT.
Sujets
PID Serval
serval:BIB_5271C2519CFD
PMID
Open Access
Oui
Date de création
2008-01-24T15:09:04.057Z
Date de création dans IRIS
2025-05-20T18:34:30Z