Int. J. Mol. Sci. 2013, 14(11), 22409-22435; doi:10.3390/ijms141122409

Ionizing Radiation-Induced Responses in Human Cells with Differing TP53 Status

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Received: 16 September 2013; in revised form: 29 October 2013 / Accepted: 4 November 2013 / Published: 13 November 2013
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Ionizing radiation triggers diverse responses in human cells encompassing apoptosis, necrosis, stress-induced premature senescence (SIPS), autophagy, and endopolyploidy (e.g., multinucleation). Most of these responses result in loss of colony-forming ability in the clonogenic survival assay. However, not all modes of so-called clonogenic cell “death” are necessarily advantageous for therapeutic outcome in cancer radiotherapy. For example, the crosstalk between SIPS and autophagy is considered to influence the capacity of the tumor cells to maintain a prolonged state of growth inhibition that unfortunately can be succeeded by tumor regrowth and disease recurrence. Likewise, endopolyploid giant cells are able to segregate into near diploid descendants that continue mitotic activities. Herein we review the current knowledge on the roles that the p53 and p21WAF1 tumor suppressors play in determining the fate of human fibroblasts (normal and Li-Fraumeni syndrome) and solid tumor-derived cells after exposure to ionizing radiation. In addition, we discuss the important role of WIP1, a p53-regulated oncogene, in the temporal regulation of the DNA damage response and its contribution to p53 dynamics post-irradiation. This article highlights the complexity of the DNA damage response and provides an impetus for rethinking the nature of cancer cell resistance to therapeutic agents.
Keywords: ionizing radiation; p53; WIP1; premature senescence; apoptosis; endopolyploidy
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MDPI and ACS Style

Mirzayans, R.; Andrais, B.; Scott, A.; Wang, Y.W.; Murray, D. Ionizing Radiation-Induced Responses in Human Cells with Differing TP53 Status. Int. J. Mol. Sci. 2013, 14, 22409-22435.

AMA Style

Mirzayans R, Andrais B, Scott A, Wang YW, Murray D. Ionizing Radiation-Induced Responses in Human Cells with Differing TP53 Status. International Journal of Molecular Sciences. 2013; 14(11):22409-22435.

Chicago/Turabian Style

Mirzayans, Razmik; Andrais, Bonnie; Scott, April; Wang, Ying W.; Murray, David. 2013. "Ionizing Radiation-Induced Responses in Human Cells with Differing TP53 Status." Int. J. Mol. Sci. 14, no. 11: 22409-22435.

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