| Autor: |
Vandepitte, Joachim, Cleynenbreugel, Ben, Hettinger, Klaudia, Poppel, Hendrik, Witte, Peter |
| Předmět: |
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| Zdroj: |
Cancer Chemotherapy & Pharmacology; Apr2011, Vol. 67 Issue 4, p775-781, 7p |
| Abstrakt: |
Purpose: In this preclinical study, we examined the biodistribution of hypericin formulated as its water-soluble PVP-hypericin complex in the different layers (urothelium, submucosa, muscle) of a normal rat bladder and a rat bladder bearing a malignant urothelium composed of syngeneic AY-27 tumor cells. The results were compared with the biodistribution of hexaminolevulinate (HAL)-induced protoporphyrin IX (PpIX). Methods: Freshly prepared PVP-hypericin and HAL solutions were instilled in both normal as well as tumor-bearing rat bladders. Following instillation, bladders were removed and snap frozen in liquid nitrogen. Fluorescence of PVP-hypericin or PpIX-induced HAL was measured in the bladder layers and quantified using image analysis software. Results: The results of these experiments show that PVP-hypericin (30 μM) accumulated about 3.5-fold more in malignant urothelial tissue when compared to normal urothelium, whereas PpIX accumulated to the same extent in malignant and normal urothelium, both after intrabladder instillation of 8 or 16 mM HAL. Besides, PVP-hypericin and PpIX accumulated selectively in the urothelium with a tumor-to-muscle ratio of 30.6 for PVP-hypericin and 3.7-8.3 for 16 and 8 mM HAL, respectively. Conclusions: This study shows that PVP-hypericin appears to have great potential as a photodynamic agent against non-muscle-invasive bladder cancers after intravesical administration, with a limited risk of affecting the deeper layers of the bladder. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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