PMID: 11340570May 8, 2001Paper

Optimization of differential photodynamic effectiveness between normal and tumor urothelial cells using 5-aminolevulinic acid-induced protoporphyrin IX as sensitizer

International Journal of Cancer. Journal International Du Cancer
J SeidlRuth Knuechel

Abstract

Photodynamic therapy using 5-aminolevulinic acid (5-ALA)-induced protoporphyrin IX is a promising tool in bladder-cancer therapy. However, little is known about the cellular mechanisms of phototoxicity. Our aim was to characterize the cellular damage and to optimize differential photodynamic effectiveness between tumor and normal urothelial cells. RT4 tumor and UROtsa normal urothelial cells were used to simulate a papillary bladder tumor in contrast to normal urothelium. Photodynamically induced damage in plasma membrane and mitochondria was monitored by flow cytometry with propidium iodide exclusion and analysis of aggregate formation of the dye JC-1. Cell morphology was investigated by phase-contrast and fluorescence microscopy following acridine orange staining. Long incubation times (3 hr) led to complete RT4 tumor cell kill accompanied by a marked fraction of damaged normal UROtsa cells. Shorter incubation intervals (1 hr) also resulted in complete RT4 tumor cell kill; however, most UROtsa cells retained their cell properties, including intact plasma membrane and active mitochondria as well as intact cellular morphology. Phototoxicity depends not only on cellular sensitizer accumulation but also on intracellular localizat...Continue Reading

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Citations

May 19, 2006·Photomedicine and Laser Surgery·Jouji NomuraToshiro Tagawa
May 19, 2009·Clinical Cancer Research : an Official Journal of the American Association for Cancer Research·Sanjay AnandEdward V Maytin
Apr 15, 2006·Photochemistry and Photobiology·Sachiko KosakaBernhard Ortel
Jun 16, 2004·Journal of Controlled Release : Official Journal of the Controlled Release Society·Yoshito TakeuchiNaoto Oku
Nov 30, 2007·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·R C KriegR Knuechel
Jun 12, 2020·Diagnostics·Kit Man ChanMelanie MacGregor

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