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Mol. Cell. Biol., Mar 1997, 1049-1056, Vol 17, No. 3
Copyright © 1997, American Society for Microbiology

E2F-1 cooperates with topoisomerase II inhibition and DNA damage to selectively augment p53-independent apoptosis

J Nip, DK Strom, BE Fee, G Zambetti, JL Cleveland and SW Hiebert
Department of Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.

Mutations in the retinoblastoma (pRb) tumor suppressor pathway including its cyclin-cdk regulatory kinases, or cdk inhibitors, are a hallmark of most cancers and allow unrestrained E2F-1 transcription factor activity, which leads to unregulated G1-to-S-phase cell cycle progression. Moderate levels of E2F-1 overexpression are tolerated in interleukin 3 (IL-3)-dependent 32D.3 myeloid progenitor cells, yet this induces apoptosis when these cells are deprived of IL-3. However, when E2F activity is augmented by coexpression of its heterodimeric partner, DP-1, the effects of survival factors are abrogated. To determine whether enforced E2F-1 expression selectively sensitizes cells to cytotoxic agents, we examined the effects of chemotherapeutic agents and radiation used in cancer therapy. E2F-1 overexpression in the myeloid cells preferentially sensitized cells to apoptosis when they were treated with the topoisomerase II inhibitor etoposide. Although E2F-1 alone induces moderate levels of p53 and treatment with drugs markedly increased p53, the deleterious effects of etoposide in E2F-1- overexpressing cells were independent of p53 accumulation. Coexpression of Bcl-2 and E2F-1 in 32D.3 cells protected them from etoposide- mediated apoptosis. However, Bcl-2 also prevented apoptosis of these cells upon exposure to 5-fluorouracil and doxorubicin, which were also cytotoxic for control cells. Pretreating E2F-1-expressing cells with ICRF-193, a second topoisomerase II inhibitor that does not damage DNA, protected the cells from etoposide-induced apoptosis. However, ICRF-193 cooperated with DNA-damaging agents to induce apoptosis. Therefore, topoisomerase II inhibition and DNA damage can cooperate to selectively induce p53-independent apoptosis in cells that have unregulated E2F-1 activity resulting from mutations in the pRb pathway.


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