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- W2016711993 abstract "We have investigated the effect of the insulin-like growth factor I receptor (IGF-IR) on ionizing radiation (IR)-induced cell death using the following two mouse embryo fibroblast cell lines: (i) R−cells with a null mutation of the IGF-IR gene, therefore expressing no endogenous IGF-IR; (ii) R+cells derived from R−cells, a stable transfectant overexpressing the human IGF-IR. Numbers of R−cells began to detach from dishes and float into the medium about 48 h after 10 Gy of X-irradiation. Internucleosomal DNA fragmentation detected by agarose gel electrophoresis, which is characteristic of apoptosis, was observed in the floating R−cells, but not in the attached cells. Unexpectedly, morphological analysis of the floating cells 72 h after irradiation revealed that only about half of them showed apoptotic death and the rest showed a nonapoptotic, presumably necrotic, one. On the other hand, R+cells retained more than 90% viability even 4 days after irradiation, and very few floating cells were observed. The G2arrest was induced in both cell lines following irradiation and G2/M fractions similarly returned to normal levels by around 20 h after irradiation, indicating that the cell death which appeared thereafter in R−cells is mediated through mitosis. Significant induction of p53 following irradiation was not detected by Western blot analysis in either R−or R+cells. Collectively, these results demonstrate that signal transduction pathways originating from the IGF-IR may be involved in preventing IR-induced apoptosis and necrosis without affecting cell cycle arrest or p53 pathways." @default.
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- W2016711993 date "1997-08-01" @default.
- W2016711993 modified "2023-10-16" @default.
- W2016711993 title "Effect of the Insulin-like Growth Factor I Receptor on Ionizing Radiation-Induced Cell Death in Mouse Embryo Fibroblasts" @default.
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- W2016711993 doi "https://doi.org/10.1006/excr.1997.3683" @default.
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