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Characterization of the cell death modes and the associated changes in cellular energy supply in response to AlPcS4-PDT

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Abstract

Photodynamic therapy (PDT) can result in both types of cell death, apoptosis or necrosis. Several steps in the induction and execution of apoptosis depend on ATP and the intracellular ATP level has been shown to be one determinant in whether apoptosis or necrosis occurs. Therefore, photochemical damage of cellular targets involved in energy supply might play a crucial role in the mode of cell death being executed. The present study is aimed at the characterization of changes in cellular energy supply and the associated cell death modes in response to PDT. Using the human epidermoid carcinoma cell line A431 and aluminium(iii) phthalocyanine tetrasulfonate chloride (2.5 μM) as a photosensitizer, we studied the changes in mitochondrial function and intracellular ATP level after irradiation with different light doses. Employing assays for caspase-3 activation and nuclear fragmentation, 50of the cells were found to undergo apoptosis after irradiation between 2.5 to 3.5 J cm−2 while the remainder died by necrosis. At higher light doses (>6 J cm−2), neither caspase-3 activation nor nuclear fragmentation was observed and this suggests that these cells died exclusively by necrosis. Necrotic cell death was also associated with a rapid decline in mitochondrial activity and intracellular ATP. By contrast, with apoptosis the loss of mitochondrial function was delayed and the ATP level was maintained at near control levels for up to eight hours which was far beyond the onset of morphological changes. These data suggest that, depending on the light dose applied, both, necrosis as well as apoptosis can be induced with AlPcS4 mediated PDT and that photodamage in energy supplying cellular targets may influence the mode of cell death. Further, it is speculated that cells undergoing apoptosis in response to PDT might maintain a high ATP level long enough to complete the apoptotic program.

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  1. Institute of Physics and Biophysics, University of Salzburg, Hellbrunnerstraβe 34, 5020, Salzburg, Austria

    Kristjan Plaetzer, Tobias Kiesslich, Barbara Krammer & Peter Hammerl

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  1. Kristjan Plaetzer
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Plaetzer, K., Kiesslich, T., Krammer, B. et al. Characterization of the cell death modes and the associated changes in cellular energy supply in response to AlPcS4-PDT. Photochem Photobiol Sci 1, 172–177 (2002). https://doi.org/10.1039/b108816e

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