期刊
LASERS IN SURGERY AND MEDICINE
卷 39, 期 3, 页码 237-244出版社
WILEY-LISS
DOI: 10.1002/lsm.20477
关键词
mTHPC Foscan; nude mice; animal model; tumor; skin phototoxicity; fluorescence microscopy; fluorescence intensity
Background/Objectives: Correlation of photodynamic activity (PDT) and fluorescence signaling for free and pegylated meta-tetrahydroxyphenylchlorin (mTHPC) in nude mice with mesothelioma xenografts. Study Design/Materials and Methods: Twelve animals received light delivery (20 J/cm(2), 150 mW/cm(2), spot size 1.2 cm) on the tumor and the hind leg 3 days after sensitization with 0.15 mg/kg free mTHPC (n=6) or equimolar-dosed pegylated mTHPC (n = 6). Groups of three animals each were sensitized with 0.15 and 0.5 mg/kg free mTHPC or equimolar dosed pegylated mTHPC followed after 3 days by fluorescence microscopy measurements. Results: Pegylated mTHPC resulted in a similar extent of PDT-related tumor necrosis but in lower skin phototoxicity than free mTHPC. Both mTHPC formulations were heterogeneously distributed in the tumor and were mainly localized in perivascular areas. Pegylated mTHPC revealed a higher tumor to skin fluorescence intensity ratio than free mTHPC (P < 0.001). Conclusions: Fluorescence signaling measurement has the potential to predict the photodynamic activity for both mTHPC formulations in mesothelioma xenografts.
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