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- W2012256039 abstract "(125)I-labeled monoclonal antibodies ((125)I-mAbs) can efficiently treat small solid tumors. Here, we investigated the role of apoptosis, autophagy and mitotic catastrophe in (125)I-mAb toxicity in p53(-/-) and p53(+/+) cancer cells.We exposed p53(-/-) and p53(+/+) HCT116 cells to increasing activities of internalizing (cytoplasmic location) anti-HER1 (125)I-mAbs, or non-internalizing (cell surface location) anti-CEA (125)I-mAbs. For each targeting model we established the relationship between survival and mean nucleus absorbed dose using the MIRD formalism.In both p53(-/-) and p53(+/+) HCT116 cells, anti-CEA (125)I-mAbs were more cytotoxic per Gy than anti-HER1 (125)I-mAbs. Sensitivity to anti-CEA (125)I-mAbs was p53-independent, while sensitivity to anti-HER1 (125)I-mAbs was higher in p53(-/-) HCT 116 cells, suggesting that they act through different signaling pathways. Apoptosis was only induced in p53(+/+) HCT116 cells and could not explain cell membrane radiation sensitivity. Inhibition of autophagy did not modify the cell response to (125)I-mAbs. By contrast, mitotic death was similarly induced in both p53(-/-) and p53(+/+) HCT116 cells by the two types of (125)I-mAbs. We also showed using medium transfer experiments that γ-H2AX foci were produced in bystander cells.Cell membrane sensitivity to (125)I-mAbs is not mediated by apoptosis and is p53-independent. Bystander effects-mediated mitotic death could be involved in the efficacy of (125)I-mAbs binding cell surface receptors." @default.
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- W2012256039 date "2013-05-01" @default.
- W2012256039 modified "2023-10-14" @default.
- W2012256039 title "Apoptosis and p53 are not involved in the anti-tumor efficacy of 125I-labeled monoclonal antibodies targeting the cell membrane" @default.
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- W2012256039 doi "https://doi.org/10.1016/j.nucmedbio.2013.02.001" @default.
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