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
Su TT
中科院分区:
生物学3区
文献类型:
--
作者:
Wichmann A;Uyetake L;Su TT

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电离辐射 (IR) 独立于 p53 诱导细胞凋亡的能力对于成功治疗携带 p53 突变的癌症至关重要。然而,相对于 p53 依赖性细胞凋亡,p53 依赖性细胞凋亡仍然知之甚少。 IR 可诱导果蝇中 p53 依赖性和 p53 非依赖性细胞凋亡,使得在遗传易处理模型中研究这两种细胞死亡模式成为可能。先前的研究发现,果蝇E2F蛋白对于p53依赖性细胞凋亡通常是促死亡或中性的。我们在这里报道 dE2F1 促进幼虫成虫盘中 IR 诱导的 p53 独立细胞凋亡。使用转录报告基因,我们提供的证据表明,当 p53 突变时,dE2F1 成为辐射后促凋亡基因 hid 转录诱导所必需的。相比之下,第二个 E2F 同源物 dE2F2 以及净 E2F 活性(可通过突变共同辅助因子 dDp 来消除)对 p53 独立的细胞凋亡具有抑制作用。我们得出的结论是,果蝇中p53依赖性和p53非依赖性细胞凋亡对E2F活性的依赖程度不同。
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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