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ISSN Print: 0731-8898
ISSN Online: 2162-6537
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Characterization of Apoptosis Induced by Photodynamic Treatment with Hypericin in A431 Human Epidermoid Carcinoma Cells
ABSTRACT
Hypericin is a naturally occurring metabolite extracted from Hypericum plants and is regarded as a promising photosensitizing agent for applications in the frame of photodynamic treatment (PDT). This treatment procedure is based on the light-induced formation of reactive oxygen species and subsequent destruction of target cells. We used an in vitro model system consisting of human epidermoid carcinoma cells (A431) and hypericin as a photosensitizer to study the time- and dose-dependent characteristics of hypericin-PDT-based induction of cytotoxicity and apoptotic cell death. The induction of apoptosis by hypericin-PDT was found to follow a strict dose-dependent manner with a transition to necrotic cell death at higher doses. Apoptosis was analyzed by characteristical biochemical and morphological markers (activation of caspases, nuclear fragmentation and membrane blebbing). Time-course analysis of an almost homogenous apoptotic population of cells (at 1.44 J/cm2) showed a rapid increase in nuclear fragmentation and activation of caspases reaching a maximum at 5 hr after irradiation. Using specific caspase substrates, significant activation of caspase-2, -3, -6, and -9 was found. Mitochondrial involvement during hypericin-PDT-induced apoptosis could be proven by a rapid reduction of the mitochondrial membrane potential; interestingly, the level of intracellular adenosine-5'-triphosphate (ATP) remains at control level for up to 6 hr post irradiation suggesting upregulation of glycolysis as a compensating mechanism of energy supply. Our data contribute to a deeper understanding of the processes involved in apoptotic cell death following photodynamic treatment with hypericin.
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