The leukaemia cells HL60, incubated in 10 mM/ml ALA (5-aminolevulinic) for 4 hours, were carried an experimental research with fluorescent probes in photodynamic therapy (PDT) based on ALA by using PDT reaction room (The average fluence rate of the 412 nm source was 5 mW/cm 2 ). Cells viability were determined using a Cell Counting Kit-8 (CCK-8) assay, and PpIX Photobleaching of subcellular distributed sites of HL60 cells in vitro were investigated by fluorescence spectra acquired during treatment. The results showed that the fluorescence intensity of mitochondria, lysosomes, endoplasmic reticulum had decreased by 81.5%, 52.3% and 21.0%, respectively, compared with their initial values after a 45-minute light treatment. The rate of PpIX photobleaching in mitochondria was significantly higher than others. Addi-tionally, the change of the activity of HL60 cells was basically characterized by the change fluorescence intensity in mitochondria, which suggest that mitochondria is one of main therapeutic targets of photodynamic therapy.
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