Abstract
The p53 tumor suppressor gene product is negatively regulated by the product of its downstream target, mdm2. The deletion of mdm2 in the mouse results in embryonic lethality at 5.5 days post coitum (d.p.c.) which can be overcome by simultaneous loss of the p53 tumor suppressor, substantiating the importance of the negative regulatory function of MDM2 on p53 function in vivo. Hence, the loss of MDM2 allowed the unregulated p53 protein to continuously exert its growth-suppressing activity, which either led to a complete G1 arrest or induced the p53-dependent apoptotic pathway, resulting in the death of the mdm2−/− embryos. To determine which of these possibilities is occurring, mouse embryo fibroblasts (MEFs) from p53 null and p53/mdm2 double null embryos were transfected with a retroviral vector carrying a temperature-sensitive p53 (tsp53) cDNA. Shifting of single-cell clonal populations to the permissive temperature caused the p53−/−mdm2−/− fibroblasts expressing tsp53 to undergo apoptosis in a dose-dependent manner. This phenotype was not observed in the tsp53 expressing p53−/− clones nor the parental cell lines. Thus, our data indicate that the simple loss of mdm2 can induce the p53-dependent apoptotic pathway in vivo.
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Acknowledgements
We thank Sylvie Wilder for expert technical assistance and Susan Evans and Mini Kapoor for constructive criticism and advice on the manuscript. This work was supported by grants from the NCI (CA47296) to G Lozano and (CA40099) to M Oren and in part from funds for The Faculty Achievement Award in Basic Research to G Lozano.
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de Rozieres, S., Maya, R., Oren, M. et al. The loss of mdm2 induces p53 mediated apoptosis. Oncogene 19, 1691–1697 (2000). https://doi.org/10.1038/sj.onc.1203468
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DOI: https://doi.org/10.1038/sj.onc.1203468
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