Protoporphyrin IX-sensitized photoinactivation of 5-aminolevulinate-treated leukemia cells: effects of exogenous iron.


Photodynamic therapy with 5-aminolevulinic acid (ALA) is based on metabolism of ALA to a photosensitizing agent, protoporphyrin IX (PpIX), in tumor cells. Photosensitivity of target cells may be influenced by mitochondrial iron levels because ferrochelatase-catalyzed insertion of Fe2+ into PpIX converts it to heme, a nonsensitizer. To investigate this… (More)


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