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Transient delay of radiation-induced apoptosis by phorbol acetate

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Abstract

The mechanisms of interference of a model tumour promoter 12-O-tetra-decanoylphorbol-13-acetate (TPA) with radiation-induced apoptosis in human peripheral lymphocytes have been investigated. The cells were treated with TPA under various conditions and thereafter exposed to a single lethal dose of gamma radiation. Morphological and biochemical changes characteristic of apoptosis were followed up to 72 h of post-irradiation time. Acute exposure to low concentration of TPA resulted in delay in the onset of radiation-induced apoptosis (determined as morphological changes and rate of mitochondrial demise) by 24–48 h as compared to the irradiated, sham TPA-treated cells. The time course of this delay correlated well with confinement of the p53 protein to the cytoplasm and increase in bcl-2 levels at the nuclear periphery of irradiated cells. Our results indicate that confinement of p53 in the cytoplasm is one of the potential mechanisms by which TPA interferes with the process of radiation-induced apoptosis in human lymphocytes.

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Acknowledgments

This study was financially supported by grants from: European Community, Contract Number FIGH-CT1999-00011, Swedish Radiation Protection Authority, Swedish National Board for Laboratory Animals, Swedish Fund for Research without Animal Experiments and The Swedish Cancer Society.

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Correspondence to Stefan Czene.

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Olsson, G., Czene, S., Haghdoost, S. et al. Transient delay of radiation-induced apoptosis by phorbol acetate. Radiat Environ Biophys 55, 95–102 (2016). https://doi.org/10.1007/s00411-015-0626-1

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