E2F1 and E2F2 have opposite effects on radiation-induced p53-independent apoptosis in Drosophila.
E2F1 and E2F2 have opposite effects on radiation-induced p53-independent apoptosis in Drosophila.
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DOI:
10.1016/j.ydbio.2010.07.023
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发表时间:
2010-10-01
影响因子:
2.7
通讯作者:
Su TT
中科院分区:
文献类型:
--
作者:
Wichmann A;Uyetake L;Su TT
The ability of ionizing radiation (IR) to induce apoptosis independently of p53 is crucial for successful therapy of cancers bearing p53 mutations. p53-independent apoptosis, however, remains poorly understood relative to p53-dependent apoptosis. IR induces both p53-dependent and p53-independent apoptosis in Drosophila melanogaster, making studies of both modes of cell death possible in a genetically tractable model. Previous studies have found that Drosophila E2F proteins are generally pro-death or neutral with regard to p53-dependent apoptosis. We report here that dE2F1 promotes IR-induced p53-independent apoptosis in larval imaginal discs. Using transcriptional reporters, we provide evidence that, when p53 is mutated, dE2F1 becomes necessary for the transcriptional induction of pro-apoptotic gene hid after irradiation. In contrast, the second E2F homolog, dE2F2, as well as the net E2F activity, which can be depleted by mutating the common co-factor, dDp, are inhibitory for p53-independent apoptosis. We conclude that p53-dependent and p53-independent apoptosis show differential reliance on E2F activity in Drosophila.
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